Ali Bagherian | Mashhad University of Medical Sciences, Mashhad. Iran. (original) (raw)

Papers by Ali Bagherian

Dental Research Journal, 2013

A prolonged life of fissure sealant has always been the target for preventing caries in vulnerabl... more A prolonged life of fissure sealant has always been the target for preventing caries in vulnerable newly erupted teeth. The use of preparatory techniques including bur introduction to the fissures is considered among such improving steps. Ninety freshly extracted healthy maxillary premolar teeth were randomly selected for this investigation. Teeth were then divided into three fissure sealant preparatory groups of A: Fissurotomy bur + acid etch; B: Pumice prophylaxis + acid etch and C: Acid etch alone. Sealant was applied to the occlusal fissures of all specimens using a plastic instrument. This was to avoid any air trap under the sealant. Sample teeth were first thermocycled (1000 cycles, 20 s dwell time) and then coated with two layers of nail varnish leaving 2 mm around the sealant. This was then followed by immersion in basic fuchsin 3%. Processed teeth were sectioned longitudinally and examined under a stereomicroscope for microleakage assessment using a score of 0-3. Collected ...

Pediatric Dentistry, 2013

The purpose of this study was to compare microbial leakage of a new hydrophilic sealant with that... more The purpose of this study was to compare microbial leakage of a new hydrophilic sealant with that of a conventional hydrophobic resin-based sealant. One hundred extracted, caries-free, human maxillary premolars were randomly divided into five groups. Those in Groups 1, 2, and 3 had dry, wet, and artificial saliva-contaminated occlusal surfaces, respectively, and were sealed with a hydrophilic sealant, while those in Groups 4 and 5 had dry and wet occlusal surfaces, respectively, and were sealed with a hydrophobic sealant. A newly designed microbial penetration method utilizing Streptococcus mutans as an indicator was tested for leakage assessment. Data were analyzed using SPSS 15.0 software, and the significance level was set at α=0.05. The log rank test indicated a statistically significant difference in leakage rates among the five groups. Mantel-Cox log-rank test findings showed that Group 3 had the highest leakage rate, with Groups 2 and 4 having the lowest. There was no statist...

Pediatric Dentistry, May 15, 2018

The purpose of this study was to evaluate the clinical and radiographic success rates of mineral ... more The purpose of this study was to evaluate the clinical and radiographic success rates of mineral trioxide aggregate partial pulpotomy (PP) compared to formocresol pulpotomy (FP) in human primary molars. In this randomized, controlled, split-mouth, clinical trial, 25 healthy five- to eight-year-olds, with 50 carious primary mandibular second molars lacking clinical and radiographic evidence of pulp pathology, were selected. The selected teeth were randomly assigned into two groups, PP and FP, for vital pulp therapy. Stainless steel crowns were placed as final restorations for both groups. Clinical and radiographic evaluation at six, 12, and 24 months used the following criteria for failure: pain; swelling; sinus tract; mobility; internal or external root resorption; furcation or periapical radiolucency; and widening of periodontal ligament space. The data were analyzed using a binary logistic generalized estimating equation model. At the 12-month and 24-month follow-ups, one child an...

Iranian journal of immunology : IJI, 2008

Early Childhood Caries (ECC) is one of the most common chronic childhood diseases. In spite of th... more Early Childhood Caries (ECC) is one of the most common chronic childhood diseases. In spite of the global decrease in dental caries in the past decades, ECC has become a significant problem in many developing countries and also in a few industrialized nations. Saliva as a host factor can play an important role in the process of dental caries. The aim of this study was to compare sIgA and IgG as saliva components between ECC and caries-free groups. In this cross-sectional study, samples of unstimulated saliva of 90 children (45 in ECC group & 45 in caries-free group) were taken with Scully method. Then the concentration levels of sIgA and IgG were measured with Enzyme Linked Immunosorbent Assay and Single Radial Immunodiffusion methods. Mean concentration levels of salivary sIgA and IgG were significantly higher among children with ECC (p<0.05). There was also a weak inverse correlation between sIgA level and DMFT index in ECC group but it was not statistically significant (p=0.05...

Dental Research Journal, 2012

Early childhood caries (ECC) is a virulent form of dental caries that can destroy the primary den... more Early childhood caries (ECC) is a virulent form of dental caries that can destroy the primary dentition of preschool children. The purpose of this study was to investigate a possible association between ECC with serum iron and serum ferritin levels. Following the ethical approval, 204 children aged 24-71 months were recruited for a double-blind, randomized cross-sectional study. Each child was examined clinically for dental caries using the World Health Organization criteria in Rafsanjan, Iran. Decayed, extracted, and filled primary teeth (deft) index was used to measure the dental caries. To determine serum iron and serum ferritin levels 2 mL blood was collected from each child. Data were then analyzed by Pearson's correlation coefficient and t-test using SPSS-16.0 software. The mean values and their standard deviations of the deft index and levels of serum iron and ferritin were 2.4(± 3.3), 93.8(± 29.0) μg/dL and 63.1(± 32.2) ng/mL, respectively, with the two latter within. Th...

Indian Journal of Dental Research, 2012

Early childhood caries (ECC) is one of the most common chronic childhood diseases. Saliva as a ho... more Early childhood caries (ECC) is one of the most common chronic childhood diseases. Saliva as a host factor plays an essential role in maintaining the integrity of oral structures. The aim of the present study was to compare resting salivary pH, buffering capacity, and secretory immunoglobulin A (sIgA), calcium, and phosphate concentrations between children with and without ECC. In this cross-sectional study, samples of unstimulated saliva of 90 children (45 in ECC group and 45 in caries-free group) were taken with Scully method. The pH and buffering capacity were determined by pH meter. sIgA, calcium, and phosphate concentrations were quantitated with ELISA, CPC photometric, and phosphomolybdate/UV methods. The mean resting salivary pH was significantly higher among children without ECC and the buffering capacity was significantly better among this group (P = 0.002). The mean sIgA concentration was significantly higher among the ECC group (P = 0.015). There were no statistically significant differences between calcium and phosphate concentrations between the two groups. The higher mean resting salivary pH and better buffering capacity found in children without ECC are probably the contributing factors that protect against caries development; but further studies are needed to understand the effects of saliva and its characteristics and components on ECC.

Introduction: The antiseptic characteristic of root canal filling materials seems very critical i... more Introduction: The antiseptic characteristic of root canal filling materials seems very critical in pulpectomy procedure to eliminate residual pathogens of root canals. The aim of this laboratory study was to compare the antibacterial activity of a newly introduced premixed calcium hydroxide root canal filling paste of deciduous teeth (Diapaste) with Zinc Oxide-Eugenol (ZOE) and Sealapex on Enterococcus faecalis. Materials & Methods: In this study, agar diffusion inhibitory test was used to assess antibacterial activity. Ten 10-cm-diameter dishes with 4.0mm thickness of agar inoculated with Enterococcus faecalis were used and four 5-mm-diameter wells per dish at equidistant points were filled with the three test root canal filling materials (Diapaste, ZOE and Sealapex) and distilled water as a negative control was used to fill the fourth well. After incubation of the plates at 37oC for 48 hours, the diameter of the zones of bacterial growth inhibition produced around the wells was me...

Pediatric dentistry, 2018

PURPOSE The purpose of this study was to evaluate the clinical and radiographic success rates of ... more PURPOSE The purpose of this study was to evaluate the clinical and radiographic success rates of mineral trioxide aggregate partial pulpotomy (PP) compared to formocresol pulpotomy (FP) in human primary molars. METHODS In this randomized, controlled, split-mouth, clinical trial, 25 healthy five- to eight-year-olds, with 50 carious primary mandibular second molars lacking clinical and radiographic evidence of pulp pathology, were selected. The selected teeth were randomly assigned into two groups, PP and FP, for vital pulp therapy. Stainless steel crowns were placed as final restorations for both groups. Clinical and radiographic evaluation at six, 12, and 24 months used the following criteria for failure: pain; swelling; sinus tract; mobility; internal or external root resorption; furcation or periapical radiolucency; and widening of periodontal ligament space. The data were analyzed using a binary logistic generalized estimating equation model. RESULTS At the 12-month and 24-month ...

Introduction: Severe rotation of individual tooth is a kind of malposition that interferes with e... more Introduction: Severe rotation of individual tooth is a kind of malposition that interferes with esthetics and may cause occlusal interferences. Case report: A ten – year – old boy with severely rotated (90 degree) maxillary right central incisor and lack of space was referred to mashhad dental school. At the first stage a removable appliance was used to make enough space and then a whip spring was used for derotation of rotated tooth. After correction of rotation a retentive removable appliance was used for a long period of time to decrease the chance of relapse. Conclusion: Combination of removable appliance with whip spring can be used successfully in the treatment of rotated teeth. Early treatment of this severely rotated teeth improves esthetics and may lead to decreasing the chance of trauma to the teeth and periodontium. Key words: Rotated tooth, whip spring, mixed dentition.

Pediatric dentistry, 2013

PURPOSE The purpose of this study was to compare microbial leakage of a new hydrophilic sealant w... more PURPOSE The purpose of this study was to compare microbial leakage of a new hydrophilic sealant with that of a conventional hydrophobic resin-based sealant. METHODS One hundred extracted, caries-free, human maxillary premolars were randomly divided into five groups. Those in Groups 1, 2, and 3 had dry, wet, and artificial saliva-contaminated occlusal surfaces, respectively, and were sealed with a hydrophilic sealant, while those in Groups 4 and 5 had dry and wet occlusal surfaces, respectively, and were sealed with a hydrophobic sealant. A newly designed microbial penetration method utilizing Streptococcus mutans as an indicator was tested for leakage assessment. Data were analyzed using SPSS 15.0 software, and the significance level was set at α=0.05. RESULTS The log rank test indicated a statistically significant difference in leakage rates among the five groups. Mantel-Cox log-rank test findings showed that Group 3 had the highest leakage rate, with Groups 2 and 4 having the lowe...

Dental Research Journal, 2012

Background: Early childhood caries (ECC) is a virulent form of dental caries that can destroy the... more Background: Early childhood caries (ECC) is a virulent form of dental caries that can destroy the primary dentition of preschool children. The purpose of this study was to investigate a possible association between ECC with serum iron and serum ferritin levels. Materials and Methods: Following the ethical approval, 204 children aged 24–71 months were recruited for a double-blind, randomized cross-sectional study. Each child was examined clinically for dental caries using the World Health Organization criteria in Rafsanjan, Iran. Decayed, extracted, and filled primary teeth (deft) index was used to measure the dental caries. To determine serum iron and serum ferritin levels 2 mL blood was collected from each child. Data were then analyzed by Pearson's correlation coefficient and t-test using SPSS-16.0 software. Results: The mean values and their standard deviations of the deft index and levels of serum iron and ferritin were 2.4(± 3.3), 93.8(± 29.0) μg/dL and 63.1(± 32.2) ng/mL, ...

Iranian journal of immunology : IJI, 2008

BACKGROUND Early Childhood Caries (ECC) is one of the most common chronic childhood diseases. In ... more BACKGROUND Early Childhood Caries (ECC) is one of the most common chronic childhood diseases. In spite of the global decrease in dental caries in the past decades, ECC has become a significant problem in many developing countries and also in a few industrialized nations. Saliva as a host factor can play an important role in the process of dental caries. OBJECTIVE The aim of this study was to compare sIgA and IgG as saliva components between ECC and caries-free groups. METHODS In this cross-sectional study, samples of unstimulated saliva of 90 children (45 in ECC group & 45 in caries-free group) were taken with Scully method. Then the concentration levels of sIgA and IgG were measured with Enzyme Linked Immunosorbent Assay and Single Radial Immunodiffusion methods. RESULTS Mean concentration levels of salivary sIgA and IgG were significantly higher among children with ECC (p<0.05). There was also a weak inverse correlation between sIgA level and DMFT index in ECC group but it was ...

Iranian Journal of Medical Education, 2012

Background: A prolonged life of fissure sealant has always been the target for preventing caries ... more Background: A prolonged life of fissure sealant has always been the target for preventing caries in vulnerable newly erupted teeth. The use of preparatory techniques including bur introduction to the fissures is considered among such improving steps. Materials and Methods: Ninety freshly extracted healthy maxillary premolar teeth were randomly selected for this investigation. Teeth were then divided into three fissure sealant preparatory groups of A: Fissurotomy bur + acid etch; B: Pumice prophylaxis + acid etch and C: Acid etch alone. Sealant was applied to the occlusal fissures of all specimens using a plastic instrument. This was to avoid any air trap under the sealant. Sample teeth were first thermocycled (1000 cycles, 20 s dwell time) and then coated with two layers of nail varnish leaving 2 mm around the sealant. This was then followed by immersion in basic fuchsin 3%. Processed teeth were sectioned longitudinally and examined under a stereomicroscope for microleakage assessme...

Introduction: Continuous evaluation of students’ educational status is necessary for improving of... more Introduction: Continuous evaluation of students’ educational status is necessary for improving of educational system. The aim of this study was to compare educational status of present dental students all around the country with previous graduated students from the viewpoint of Iranian dental faculty members. Methods: This descriptive cross-sectional study was carried out in 2011. The information was collected by a valid and reliable questionnaire that was completed by 354 eligible faculty members employed in 18 dental schools. The questionnaire was designed to compare educational status of present dental students with that of the previous graduated students. Data were analyzed using descriptive statistics, independent t-test, ANOVA and Spearman correlation coefficient. Results: More than 50% of the faculty members stated that the students’ tendency to participate in specialty exams and to embark on research activities is better to much better then before; but interest in didactic c...

Dental Research Journal, 2017

Background: The aim of this study was to compare microbial microleakage of class V cavities resto... more Background: The aim of this study was to compare microbial microleakage of class V cavities restored with different materials and techniques using a microbial leakage assessment method. Materials and Methods: One hundred extracted, caries-free, human maxillary premolars were randomly divided into five groups. Group 1: Resin-modified glass ionomer (RMGI), Group 2: Closed sandwich with flowable composite + nanohybrid composite, Group 3: Nanohybrid composite, Group 4: Closed sandwich with RMGI + nanohybrid composite, and Group 5: Flowable composite + nanohybrid composite that were co-cured together (“snow-plow” technique). A microbial penetration method utilizing Streptococcus mutans as an indicator was tested for leakage assessment. Data were analyzed and the significance level was α =0.05. Results: The log-rank test indicated a statistically significant difference in leakage rates among the five groups (P = 0.008). Mantel–Cox log-rank test indicated statistically significant differences in microleakage rates between Groups 1 and 3 (P = 0.029), between Groups 2 and 5 (P = 0.005), and between Groups 3 and 5 (P = 0.002). Conclusion: With respect to the limitations of an in vitro study, our findings suggest that adding a thin layer of flowable composite or RMGI under nanohybrid composite in class V cavities did not decrease the bacterial leakage rate, whereas use of the “snow-plow” technique caused an increase in the microleakage rate.

The Journal of the American Dental Association

BACKGROUND The aim of this systematic review and meta-analysis was to evaluate the ability of gla... more BACKGROUND The aim of this systematic review and meta-analysis was to evaluate the ability of glass ionomer cements (GICs) and resin-based sealants (RBSs) to prevent the occurrence of caries and their retention in standards-based clinical studies. TYPES OF STUDIES REVIEWED The authors conducted a literature search (from database inception through September 20, 2017) to identify studies for inclusion in this systematic review. The authors assessed the quality of the evidence with the modified Jadad scale and performed the meta-analysis by using a random-effects model. RESULTS The authors considered 20 studies on caries prevention and 28 studies on retention that met the inclusion criteria for the meta-analysis. The results of the meta-analysis for caries development showed no significant difference (odds ratio, 0.938; 95% confidence interval, 0.647 to 1.359; P = .734). However, the result for the retention rate showed the advantage of RBSs (odds ratio, 6.006; 95% confidence interval, 3.226 to 11.183; P = .000). CONCLUSIONS AND PRACTICAL IMPLICATIONS There was no difference between the percentage of caries development with use of GICs as fissure sealing material compared with that for the conventional RBSs, but the retention rate of conventional RBSs was much higher than that of the GICs.

Dental research journal

Tooth extraction causes an open wound in the soft and hard tissues. During the inflammatory phase... more Tooth extraction causes an open wound in the soft and hard tissues. During the inflammatory phase of the healing process, a large amount of free radicals are produced and cause oxidative stress, which leads to tissue damage and delayed wound healing. Thus, in this study, we evaluated the effect of tert-butylhydroquinone (TBHQ), as an antioxidant, on the healing process of tooth sockets in rats. To conduct this experimental study, male Wistar rats (n = 42) were divided into two groups. In each case, one upper second molar was extracted under general anesthesia. After the extraction, the tooth sockets of the experimental group were treated with a 0.02% TBHQ solution (0.1 ml) while the same volume of distilled water placed in the sockets of the control group. On days 3, 7, and 21 postoperatively, 7 rats from each group were euthanized, and histological slides were prepared from their tooth sockets. The prepared slides were examined histopathologically using a light microscope and compa...

Dental Research Journal, 2013

A prolonged life of fissure sealant has always been the target for preventing caries in vulnerabl... more A prolonged life of fissure sealant has always been the target for preventing caries in vulnerable newly erupted teeth. The use of preparatory techniques including bur introduction to the fissures is considered among such improving steps. Ninety freshly extracted healthy maxillary premolar teeth were randomly selected for this investigation. Teeth were then divided into three fissure sealant preparatory groups of A: Fissurotomy bur + acid etch; B: Pumice prophylaxis + acid etch and C: Acid etch alone. Sealant was applied to the occlusal fissures of all specimens using a plastic instrument. This was to avoid any air trap under the sealant. Sample teeth were first thermocycled (1000 cycles, 20 s dwell time) and then coated with two layers of nail varnish leaving 2 mm around the sealant. This was then followed by immersion in basic fuchsin 3%. Processed teeth were sectioned longitudinally and examined under a stereomicroscope for microleakage assessment using a score of 0-3. Collected ...

Pediatric Dentistry, 2013

The purpose of this study was to compare microbial leakage of a new hydrophilic sealant with that... more The purpose of this study was to compare microbial leakage of a new hydrophilic sealant with that of a conventional hydrophobic resin-based sealant. One hundred extracted, caries-free, human maxillary premolars were randomly divided into five groups. Those in Groups 1, 2, and 3 had dry, wet, and artificial saliva-contaminated occlusal surfaces, respectively, and were sealed with a hydrophilic sealant, while those in Groups 4 and 5 had dry and wet occlusal surfaces, respectively, and were sealed with a hydrophobic sealant. A newly designed microbial penetration method utilizing Streptococcus mutans as an indicator was tested for leakage assessment. Data were analyzed using SPSS 15.0 software, and the significance level was set at α=0.05. The log rank test indicated a statistically significant difference in leakage rates among the five groups. Mantel-Cox log-rank test findings showed that Group 3 had the highest leakage rate, with Groups 2 and 4 having the lowest. There was no statist...

Pediatric Dentistry, May 15, 2018

The purpose of this study was to evaluate the clinical and radiographic success rates of mineral ... more The purpose of this study was to evaluate the clinical and radiographic success rates of mineral trioxide aggregate partial pulpotomy (PP) compared to formocresol pulpotomy (FP) in human primary molars. In this randomized, controlled, split-mouth, clinical trial, 25 healthy five- to eight-year-olds, with 50 carious primary mandibular second molars lacking clinical and radiographic evidence of pulp pathology, were selected. The selected teeth were randomly assigned into two groups, PP and FP, for vital pulp therapy. Stainless steel crowns were placed as final restorations for both groups. Clinical and radiographic evaluation at six, 12, and 24 months used the following criteria for failure: pain; swelling; sinus tract; mobility; internal or external root resorption; furcation or periapical radiolucency; and widening of periodontal ligament space. The data were analyzed using a binary logistic generalized estimating equation model. At the 12-month and 24-month follow-ups, one child an...

Iranian journal of immunology : IJI, 2008

Early Childhood Caries (ECC) is one of the most common chronic childhood diseases. In spite of th... more Early Childhood Caries (ECC) is one of the most common chronic childhood diseases. In spite of the global decrease in dental caries in the past decades, ECC has become a significant problem in many developing countries and also in a few industrialized nations. Saliva as a host factor can play an important role in the process of dental caries. The aim of this study was to compare sIgA and IgG as saliva components between ECC and caries-free groups. In this cross-sectional study, samples of unstimulated saliva of 90 children (45 in ECC group & 45 in caries-free group) were taken with Scully method. Then the concentration levels of sIgA and IgG were measured with Enzyme Linked Immunosorbent Assay and Single Radial Immunodiffusion methods. Mean concentration levels of salivary sIgA and IgG were significantly higher among children with ECC (p<0.05). There was also a weak inverse correlation between sIgA level and DMFT index in ECC group but it was not statistically significant (p=0.05...

Dental Research Journal, 2012

Early childhood caries (ECC) is a virulent form of dental caries that can destroy the primary den... more Early childhood caries (ECC) is a virulent form of dental caries that can destroy the primary dentition of preschool children. The purpose of this study was to investigate a possible association between ECC with serum iron and serum ferritin levels. Following the ethical approval, 204 children aged 24-71 months were recruited for a double-blind, randomized cross-sectional study. Each child was examined clinically for dental caries using the World Health Organization criteria in Rafsanjan, Iran. Decayed, extracted, and filled primary teeth (deft) index was used to measure the dental caries. To determine serum iron and serum ferritin levels 2 mL blood was collected from each child. Data were then analyzed by Pearson's correlation coefficient and t-test using SPSS-16.0 software. The mean values and their standard deviations of the deft index and levels of serum iron and ferritin were 2.4(± 3.3), 93.8(± 29.0) μg/dL and 63.1(± 32.2) ng/mL, respectively, with the two latter within. Th...

Indian Journal of Dental Research, 2012

Early childhood caries (ECC) is one of the most common chronic childhood diseases. Saliva as a ho... more Early childhood caries (ECC) is one of the most common chronic childhood diseases. Saliva as a host factor plays an essential role in maintaining the integrity of oral structures. The aim of the present study was to compare resting salivary pH, buffering capacity, and secretory immunoglobulin A (sIgA), calcium, and phosphate concentrations between children with and without ECC. In this cross-sectional study, samples of unstimulated saliva of 90 children (45 in ECC group and 45 in caries-free group) were taken with Scully method. The pH and buffering capacity were determined by pH meter. sIgA, calcium, and phosphate concentrations were quantitated with ELISA, CPC photometric, and phosphomolybdate/UV methods. The mean resting salivary pH was significantly higher among children without ECC and the buffering capacity was significantly better among this group (P = 0.002). The mean sIgA concentration was significantly higher among the ECC group (P = 0.015). There were no statistically significant differences between calcium and phosphate concentrations between the two groups. The higher mean resting salivary pH and better buffering capacity found in children without ECC are probably the contributing factors that protect against caries development; but further studies are needed to understand the effects of saliva and its characteristics and components on ECC.

Introduction: The antiseptic characteristic of root canal filling materials seems very critical i... more Introduction: The antiseptic characteristic of root canal filling materials seems very critical in pulpectomy procedure to eliminate residual pathogens of root canals. The aim of this laboratory study was to compare the antibacterial activity of a newly introduced premixed calcium hydroxide root canal filling paste of deciduous teeth (Diapaste) with Zinc Oxide-Eugenol (ZOE) and Sealapex on Enterococcus faecalis. Materials & Methods: In this study, agar diffusion inhibitory test was used to assess antibacterial activity. Ten 10-cm-diameter dishes with 4.0mm thickness of agar inoculated with Enterococcus faecalis were used and four 5-mm-diameter wells per dish at equidistant points were filled with the three test root canal filling materials (Diapaste, ZOE and Sealapex) and distilled water as a negative control was used to fill the fourth well. After incubation of the plates at 37oC for 48 hours, the diameter of the zones of bacterial growth inhibition produced around the wells was me...

Pediatric dentistry, 2018

PURPOSE The purpose of this study was to evaluate the clinical and radiographic success rates of ... more PURPOSE The purpose of this study was to evaluate the clinical and radiographic success rates of mineral trioxide aggregate partial pulpotomy (PP) compared to formocresol pulpotomy (FP) in human primary molars. METHODS In this randomized, controlled, split-mouth, clinical trial, 25 healthy five- to eight-year-olds, with 50 carious primary mandibular second molars lacking clinical and radiographic evidence of pulp pathology, were selected. The selected teeth were randomly assigned into two groups, PP and FP, for vital pulp therapy. Stainless steel crowns were placed as final restorations for both groups. Clinical and radiographic evaluation at six, 12, and 24 months used the following criteria for failure: pain; swelling; sinus tract; mobility; internal or external root resorption; furcation or periapical radiolucency; and widening of periodontal ligament space. The data were analyzed using a binary logistic generalized estimating equation model. RESULTS At the 12-month and 24-month ...

Introduction: Severe rotation of individual tooth is a kind of malposition that interferes with e... more Introduction: Severe rotation of individual tooth is a kind of malposition that interferes with esthetics and may cause occlusal interferences. Case report: A ten – year – old boy with severely rotated (90 degree) maxillary right central incisor and lack of space was referred to mashhad dental school. At the first stage a removable appliance was used to make enough space and then a whip spring was used for derotation of rotated tooth. After correction of rotation a retentive removable appliance was used for a long period of time to decrease the chance of relapse. Conclusion: Combination of removable appliance with whip spring can be used successfully in the treatment of rotated teeth. Early treatment of this severely rotated teeth improves esthetics and may lead to decreasing the chance of trauma to the teeth and periodontium. Key words: Rotated tooth, whip spring, mixed dentition.

Pediatric dentistry, 2013

PURPOSE The purpose of this study was to compare microbial leakage of a new hydrophilic sealant w... more PURPOSE The purpose of this study was to compare microbial leakage of a new hydrophilic sealant with that of a conventional hydrophobic resin-based sealant. METHODS One hundred extracted, caries-free, human maxillary premolars were randomly divided into five groups. Those in Groups 1, 2, and 3 had dry, wet, and artificial saliva-contaminated occlusal surfaces, respectively, and were sealed with a hydrophilic sealant, while those in Groups 4 and 5 had dry and wet occlusal surfaces, respectively, and were sealed with a hydrophobic sealant. A newly designed microbial penetration method utilizing Streptococcus mutans as an indicator was tested for leakage assessment. Data were analyzed using SPSS 15.0 software, and the significance level was set at α=0.05. RESULTS The log rank test indicated a statistically significant difference in leakage rates among the five groups. Mantel-Cox log-rank test findings showed that Group 3 had the highest leakage rate, with Groups 2 and 4 having the lowe...

Dental Research Journal, 2012

Background: Early childhood caries (ECC) is a virulent form of dental caries that can destroy the... more Background: Early childhood caries (ECC) is a virulent form of dental caries that can destroy the primary dentition of preschool children. The purpose of this study was to investigate a possible association between ECC with serum iron and serum ferritin levels. Materials and Methods: Following the ethical approval, 204 children aged 24–71 months were recruited for a double-blind, randomized cross-sectional study. Each child was examined clinically for dental caries using the World Health Organization criteria in Rafsanjan, Iran. Decayed, extracted, and filled primary teeth (deft) index was used to measure the dental caries. To determine serum iron and serum ferritin levels 2 mL blood was collected from each child. Data were then analyzed by Pearson's correlation coefficient and t-test using SPSS-16.0 software. Results: The mean values and their standard deviations of the deft index and levels of serum iron and ferritin were 2.4(± 3.3), 93.8(± 29.0) μg/dL and 63.1(± 32.2) ng/mL, ...

Iranian journal of immunology : IJI, 2008

BACKGROUND Early Childhood Caries (ECC) is one of the most common chronic childhood diseases. In ... more BACKGROUND Early Childhood Caries (ECC) is one of the most common chronic childhood diseases. In spite of the global decrease in dental caries in the past decades, ECC has become a significant problem in many developing countries and also in a few industrialized nations. Saliva as a host factor can play an important role in the process of dental caries. OBJECTIVE The aim of this study was to compare sIgA and IgG as saliva components between ECC and caries-free groups. METHODS In this cross-sectional study, samples of unstimulated saliva of 90 children (45 in ECC group & 45 in caries-free group) were taken with Scully method. Then the concentration levels of sIgA and IgG were measured with Enzyme Linked Immunosorbent Assay and Single Radial Immunodiffusion methods. RESULTS Mean concentration levels of salivary sIgA and IgG were significantly higher among children with ECC (p<0.05). There was also a weak inverse correlation between sIgA level and DMFT index in ECC group but it was ...

Iranian Journal of Medical Education, 2012

Background: A prolonged life of fissure sealant has always been the target for preventing caries ... more Background: A prolonged life of fissure sealant has always been the target for preventing caries in vulnerable newly erupted teeth. The use of preparatory techniques including bur introduction to the fissures is considered among such improving steps. Materials and Methods: Ninety freshly extracted healthy maxillary premolar teeth were randomly selected for this investigation. Teeth were then divided into three fissure sealant preparatory groups of A: Fissurotomy bur + acid etch; B: Pumice prophylaxis + acid etch and C: Acid etch alone. Sealant was applied to the occlusal fissures of all specimens using a plastic instrument. This was to avoid any air trap under the sealant. Sample teeth were first thermocycled (1000 cycles, 20 s dwell time) and then coated with two layers of nail varnish leaving 2 mm around the sealant. This was then followed by immersion in basic fuchsin 3%. Processed teeth were sectioned longitudinally and examined under a stereomicroscope for microleakage assessme...

Introduction: Continuous evaluation of students’ educational status is necessary for improving of... more Introduction: Continuous evaluation of students’ educational status is necessary for improving of educational system. The aim of this study was to compare educational status of present dental students all around the country with previous graduated students from the viewpoint of Iranian dental faculty members. Methods: This descriptive cross-sectional study was carried out in 2011. The information was collected by a valid and reliable questionnaire that was completed by 354 eligible faculty members employed in 18 dental schools. The questionnaire was designed to compare educational status of present dental students with that of the previous graduated students. Data were analyzed using descriptive statistics, independent t-test, ANOVA and Spearman correlation coefficient. Results: More than 50% of the faculty members stated that the students’ tendency to participate in specialty exams and to embark on research activities is better to much better then before; but interest in didactic c...

Dental Research Journal, 2017

Background: The aim of this study was to compare microbial microleakage of class V cavities resto... more Background: The aim of this study was to compare microbial microleakage of class V cavities restored with different materials and techniques using a microbial leakage assessment method. Materials and Methods: One hundred extracted, caries-free, human maxillary premolars were randomly divided into five groups. Group 1: Resin-modified glass ionomer (RMGI), Group 2: Closed sandwich with flowable composite + nanohybrid composite, Group 3: Nanohybrid composite, Group 4: Closed sandwich with RMGI + nanohybrid composite, and Group 5: Flowable composite + nanohybrid composite that were co-cured together (“snow-plow” technique). A microbial penetration method utilizing Streptococcus mutans as an indicator was tested for leakage assessment. Data were analyzed and the significance level was α =0.05. Results: The log-rank test indicated a statistically significant difference in leakage rates among the five groups (P = 0.008). Mantel–Cox log-rank test indicated statistically significant differences in microleakage rates between Groups 1 and 3 (P = 0.029), between Groups 2 and 5 (P = 0.005), and between Groups 3 and 5 (P = 0.002). Conclusion: With respect to the limitations of an in vitro study, our findings suggest that adding a thin layer of flowable composite or RMGI under nanohybrid composite in class V cavities did not decrease the bacterial leakage rate, whereas use of the “snow-plow” technique caused an increase in the microleakage rate.

The Journal of the American Dental Association

BACKGROUND The aim of this systematic review and meta-analysis was to evaluate the ability of gla... more BACKGROUND The aim of this systematic review and meta-analysis was to evaluate the ability of glass ionomer cements (GICs) and resin-based sealants (RBSs) to prevent the occurrence of caries and their retention in standards-based clinical studies. TYPES OF STUDIES REVIEWED The authors conducted a literature search (from database inception through September 20, 2017) to identify studies for inclusion in this systematic review. The authors assessed the quality of the evidence with the modified Jadad scale and performed the meta-analysis by using a random-effects model. RESULTS The authors considered 20 studies on caries prevention and 28 studies on retention that met the inclusion criteria for the meta-analysis. The results of the meta-analysis for caries development showed no significant difference (odds ratio, 0.938; 95% confidence interval, 0.647 to 1.359; P = .734). However, the result for the retention rate showed the advantage of RBSs (odds ratio, 6.006; 95% confidence interval, 3.226 to 11.183; P = .000). CONCLUSIONS AND PRACTICAL IMPLICATIONS There was no difference between the percentage of caries development with use of GICs as fissure sealing material compared with that for the conventional RBSs, but the retention rate of conventional RBSs was much higher than that of the GICs.

Dental research journal

Tooth extraction causes an open wound in the soft and hard tissues. During the inflammatory phase... more Tooth extraction causes an open wound in the soft and hard tissues. During the inflammatory phase of the healing process, a large amount of free radicals are produced and cause oxidative stress, which leads to tissue damage and delayed wound healing. Thus, in this study, we evaluated the effect of tert-butylhydroquinone (TBHQ), as an antioxidant, on the healing process of tooth sockets in rats. To conduct this experimental study, male Wistar rats (n = 42) were divided into two groups. In each case, one upper second molar was extracted under general anesthesia. After the extraction, the tooth sockets of the experimental group were treated with a 0.02% TBHQ solution (0.1 ml) while the same volume of distilled water placed in the sockets of the control group. On days 3, 7, and 21 postoperatively, 7 rats from each group were euthanized, and histological slides were prepared from their tooth sockets. The prepared slides were examined histopathologically using a light microscope and compa...