Ana Marchionatti | UFSM - Universidade Federal de Santa Maria (original) (raw)
Papers by Ana Marchionatti
Objective: To evaluate the influence of cycles’ frequency of mechanical fatigue on bond strength ... more Objective: To evaluate the influence of cycles’ frequency of mechanical fatigue on bond strength between glass fiber posts and root dentin. Method: 40 bovine roots were prepared in 10 mm with a custom drill of the fiber post system (white Post DC #2, FGM) and embedded in acrylic resin. The fiber posts were cemented into the root canals with a 2-steps etch&rinse adhesive system (Ambar, FGM) and resin cement (AllCem, FGM). The core was built up with composite resin. The specimens were divided in four groups according to the frequency of mechanical cycling (45° angle; 37°C; 88 N; 1 million cycles): G1- without mechanical cycling (control group); G2- 2Hz; G3- 4Hz; G4- 8Hz. After mechanical cycling, all the specimens were sectioned in 4 slices with a thickness of 2mm, and the push-out test was performed. Failure mode was observed with a stereomicroscope. The means of the repetitions from each group (n=10) were statistically analyzed (1-way ANOVA and Tukey test). Result: The mechanical cy...
Introduction: The occurrence of canine impaction is not a rare phenomenon, but transmigration of ... more Introduction: The occurrence of canine impaction is not a rare phenomenon, but transmigration of the tooth across the midline is a less common event. The finding is normally asymptomatic and the etiologic factors involved in the transmigration process are still unclear. Objective: To present a clinical case of surgical treatment of a transmigrated mandibular canine. Case report: A 17-year-old male patient presented to the dental clinic to remove an unerupted canine. Clinical and radiological examinations led to the diagnosis of a transmigrated canine in the mental region. Surgical removal was the treatment of choice and further radiographs were needed to complement the clinical exam and to determine the location of the tooth precisely for the surgical procedure. Postoperative period was uneventful. Canine transmigration is a rare finding and symptoms are usually absent. Conclusion: An early detection is important to plan the treatment and mainly to avoid future complications.
The Journal of Prosthetic Dentistry, 2020
STATEMENT OF PROBLEM Reasons for failures of bilayer yttria-stabilized tetragonal zirconia polycr... more STATEMENT OF PROBLEM Reasons for failures of bilayer yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) restorations include the core-veneer interface bond strength. The influence of the veneering method on the bond strength of veneered Y-TZP is unclear. PURPOSE The purpose of this systematic review and meta-analysis was to evaluate the effect of the veneering method on the bond strength of bilayer Y-TZP. MATERIAL AND METHODS This review followed the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) statement. Searches were performed on PubMed/MEDLINE, Web of Science (Core Collection), and Scopus for in vitro studies evaluating the effect of the veneering technique on the bond strength of bilayer Y-TZP. Statistical analyses were performed with random-effect models (α=.05). RESULTS From 619 identified studies, 140 were selected for full-text analysis and 16 were included. Manual searching yielded no additional articles. The meta-analyses comprised 15 studies, and 1 study was included only in the descriptive analysis. Meta-analyses compared the hand-layered method (control) with pressed, fused, and cemented veneering methods. The fused and cemented techniques were analyzed by using subgroups assessing the veneering ceramic type (predominantly glass-ceramics and particle-filled glass-ceramics). Similar bond strength results (P=.540) were found for pressed and hand-layered veneered Y-TZP specimens. Fused veneers achieved higher bond strength values (P<.001) than the hand-layered veneers on Y-TZP frameworks, irrespective of the veneering ceramic type (predominantly glass-ceramics: P=.002; particle-filled glass-ceramics: P<.001). Global and subgroup analyses indicated that lower core-veneer bond strength values (P<.001) were found for cemented in relation to hand-layered veneers. CONCLUSIONS Core-veneer interfacial adhesion was equivalent for pressed and hand-layered veneering techniques. Improved bond strength, regardless of the veneer ceramic material type, was achieved by the fused veneering method, which seems to be a promising choice for the veneering of Y-TZP. In contrast, the cemented method may be unsuitable for veneering Y-TZP structures because of its lower bond strength than the hand-layered veneering technique.
Brazilian Dental Journal, 2008
This study evaluated the fracture resistance of weakened roots restored with glass fiber posts, c... more This study evaluated the fracture resistance of weakened roots restored with glass fiber posts, composite resin cores and complete metal crowns. Thirty maxillary canines were randomly divided into 3 groups of 10 teeth each: teeth without weakened roots (control); teeth with partially weakened roots (PWR) and teeth with and largely weakened roots (LWR). The control group was restored with glass fiber posts and a composite resin core. Teeth in the PWR and LWR groups were flared internally to standardized dimensions in order to simulate root weakness. Thereafter, the roots were partially filled with composite resin and restored in the same way as in the control group. The specimens were exposed to 250,000 cycles in a controlled chewing simulator. All intact specimens were subjected to a static load (N) in a universal testing machine at 45 degrees to the long axis of the tooth until failure. Data were analyzed by one-way ANOVA and Dunnett's test for multiple comparisons (p=0.05). Th...
The Journal of Prosthetic Dentistry, 2017
Dental ceramics are widely used for esthetic restorative treatments owing to their desirable char... more Dental ceramics are widely used for esthetic restorative treatments owing to their desirable characteristics: color stability, translucency, tooth-like optical properties, mechanical resistance, durability, and compatibility with periodontal tissue. 1-4 A popular approach for esthetic treatments is the use of laminate veneers, which are indicated to increase tooth size, reduce diastemas, and to correct form and discoloration. 1,5 With the evolution of adhesive systems, resin cements and ceramic materials, it is now possible to attach 0.1-to 0.7-mm-thick ceramic laminate veneers with minimal or no tooth preparation. 1,3,6-8 The color stability of the luting agents influences the esthetic result of ceramic restorations, which is a determinant of long-term success, 3,6,9 especially in highly translucent restorations. 10,11 Any alteration of the cement color that results in a mismatch with the adjacent teeth is a reason for restoration replacement 6,12 and may be considered a treatment failure. 12
The Journal of prosthetic dentistry, Jan 21, 2018
Although several monolithic zirconia ceramics have recently been introduced, the need for improve... more Although several monolithic zirconia ceramics have recently been introduced, the need for improved optical properties remains. The newest cubic-zirconia has been claimed to have optimal translucency characteristics for esthetic restorations. This in vitro study evaluated the optical properties of novel cubic ultratranslucent (UT) and supertranslucent (ST) zirconia by comparing them with lithium disilicate (L-DIS) glass-ceramic for the manufacture of monolithic computer-aided design and computer-aided manufacturing (CAD-CAM) molar crowns. The UT and ST multilayered zirconia and the low-translucency grade L-DIS were milled. Eighty monolithic crowns were made from 2 CAD files, corresponding to thicknesses of 1.0 and 1.5 mm, and subdivided (n=20) into 4 groups: UT1.0, UT1.5, ST1.0, and L-DIS1.5. All groups were shaded using A2 color standard. Translucency of the crowns was measured by total transmission, using a photoradiometer in a dark chamber; furthermore, the contrast ratio was anal...
Brazilian Oral Research
The aim of this systematic review was to compare the clinical performance and failure modes of te... more The aim of this systematic review was to compare the clinical performance and failure modes of teeth restored with intra-radicular retainers. A search was performed on PubMed/Medline, Central and ClinicalTrials databases for randomized clinical trials comparing clinical behavior and failures of at least two types of retainers. From 341 detected papers, 16 were selected for full-text analysis, of which 9 met the eligibility criteria. A manual search added 2 more studies, totalizing 11 studies that were included in this review. Evaluated retainers were fiber (prefabricated and customized) and metal (prefabricated and cast) posts, and follow-up ranged from 6 months to 10 years. Most studies showed good clinical behavior for evaluated intra-radicular retainers. Reported survival rates varied from 71 to 100% for fiber posts and 50 to 97.1% for metal posts. Studies found no difference in the survival among different metal posts and most studies found no difference between fiber and metal posts. Two studies also showed that remaining dentine height, number of walls and ferrule increased the longevity of the restored teeth. Failures of fiber posts were mainly due to post loss of retention, while metal post failures were mostly related to root fracture, post fracture and crown and/or post loss of retention. In conclusion, metal and fiber posts present similar clinical behavior at short to medium term follow-up. Remaining dental structure and ferrule increase the survival of restored pulpless teeth. Studies with longer follow-up are needed.
Introdução e objetivo: O objetivo deste estudo foi identificar a presença de hábitos bucais delet... more Introdução e objetivo: O objetivo deste estudo foi identificar a presença de hábitos bucais deletérios e relacioná-la com a duração de aleitamento materno. Material e métodos: Foi realizado um estudo retrospectivo, utilizando-se dados secundários contidos em 143 prontuários de crianças entre 0 e 59 meses, assistidas em clínica pública de Odontopediatria. Nos prontuários, constavam perguntas sobre a presença de hábitos bucais e sua frequência, bem como o período de duração do aleitamento materno. Os dados foram analisados Palavras-chave: aleitamento materno; hábitos deletérios; prevalência.
Rsbo, Mar 1, 2010
... ASSOCIAÇÃO ENTRE DURAÇÃO DO ALEITAMENTO MATERNO E DISTOCLUSÃO NA DENTIÇÃO DECÍDUA DISSERTAÇÃO... more ... ASSOCIAÇÃO ENTRE DURAÇÃO DO ALEITAMENTO MATERNO E DISTOCLUSÃO NA DENTIÇÃO DECÍDUA DISSERTAÇÃO DE MESTRADO ... ADOLESCENTE ASSOCIAÇÃO ENTRE DURAÇÃO DO ALEITAMENTO MATERNO E DISTOCLUSÃO NA DENTIÇÃO DECÍDUA ...
Dental materials : official publication of the Academy of Dental Materials, 2016
A systematic review was conducted to assess the effects of air-particle abrasion procedures on th... more A systematic review was conducted to assess the effects of air-particle abrasion procedures on the mechanical strength and phase transformation of yttria-stabilized tetragonal zirconia polycrystal (Y-TZP). This report followed the PRISMA Statement. From 1013 eligible studies, 78 were selected for full-text analysis, from which 37 were excluded. The 41 remaining papers were included for the systematic review; hand-searching yielded three papers. The review comprised a total of 44 studies; 21 were included in the meta-analysis. Searches were performed with no publication year limit through November 2015 in PubMed/MEDLINE, Web of Science (Core Collection) and Scopus databases. In vitro studies evaluating the effect of air-particle abrasion protocols on the mechanical strength and/or phase transformation of Y-TZP zirconia specimens, immediately or after aging. For the meta-analysis, flexural strength data of air-particle abrasion vs. control (nonabraded) were globally and subgroup analy...
General dentistry
The purposes of the study were to evaluate the effect of mechanical cycling (MC) on the fracture ... more The purposes of the study were to evaluate the effect of mechanical cycling (MC) on the fracture resistance of endodontically treated weakened roots restored with different intraradicular retainers and to analyze the failure mode. Eighty bovine roots were prepared and restored: 20 roots were reconstructed with cast post-and-cores (CPCs); 20 with fiber posts (FPs); 20 with fiber posts with larger coronal diameter (FPLs); and 20 with anatomic posts (APs). Metal crowns were cemented in all the roots. Half of specimens from each restoration strategy (n = 10) were submitted to MC: CPC-MC, FP-MC, FPL-MC, and AP-MC. The specimens were subjected to a fracture resistance test. The results showed that the type of retainer used was statistically significant (P < 0.0004). The CPC specimens demonstrated a fracture resistance similar to that of the APs, but greater than that of the FPs and FPLs. MC was statistically significant (P < 0.003) and affected AP-MC fracture resistance, which was l...
Objective: To evaluate the influence of cycles’ frequency of mechanical fatigue on bond strength ... more Objective: To evaluate the influence of cycles’ frequency of mechanical fatigue on bond strength between glass fiber posts and root dentin. Method: 40 bovine roots were prepared in 10 mm with a custom drill of the fiber post system (white Post DC #2, FGM) and embedded in acrylic resin. The fiber posts were cemented into the root canals with a 2-steps etch&rinse adhesive system (Ambar, FGM) and resin cement (AllCem, FGM). The core was built up with composite resin. The specimens were divided in four groups according to the frequency of mechanical cycling (45° angle; 37°C; 88 N; 1 million cycles): G1- without mechanical cycling (control group); G2- 2Hz; G3- 4Hz; G4- 8Hz. After mechanical cycling, all the specimens were sectioned in 4 slices with a thickness of 2mm, and the push-out test was performed. Failure mode was observed with a stereomicroscope. The means of the repetitions from each group (n=10) were statistically analyzed (1-way ANOVA and Tukey test). Result: The mechanical cy...
Journal of Applied Oral Science, 2014
Introduction: The occurrence of canine impaction is not a rare phenomenon, but transmigration of ... more Introduction: The occurrence of canine impaction is not a rare phenomenon, but transmigration of the tooth across the midline is a less common event. The finding is normally asymptomatic and the etiologic factors involved in the transmigration process are still unclear. Objective: To present a clinical case of surgical treatment of a transmigrated mandibular canine. Case report: A 17-year-old male patient presented to the dental clinic to remove an unerupted canine. Clinical and radiological examinations led to the diagnosis of a transmigrated canine in the mental region. Surgical removal was the treatment of choice and further radiographs were needed to complement the clinical exam and to determine the location of the tooth precisely for the surgical procedure. Postoperative period was uneventful. Canine transmigration is a rare finding and symptoms are usually absent. Conclusion: An early detection is important to plan the treatment and mainly to avoid future complications.
Objective: To evaluate the influence of cycles’ frequency of mechanical fatigue on bond strength ... more Objective: To evaluate the influence of cycles’ frequency of mechanical fatigue on bond strength between glass fiber posts and root dentin. Method: 40 bovine roots were prepared in 10 mm with a custom drill of the fiber post system (white Post DC #2, FGM) and embedded in acrylic resin. The fiber posts were cemented into the root canals with a 2-steps etch&rinse adhesive system (Ambar, FGM) and resin cement (AllCem, FGM). The core was built up with composite resin. The specimens were divided in four groups according to the frequency of mechanical cycling (45° angle; 37°C; 88 N; 1 million cycles): G1- without mechanical cycling (control group); G2- 2Hz; G3- 4Hz; G4- 8Hz. After mechanical cycling, all the specimens were sectioned in 4 slices with a thickness of 2mm, and the push-out test was performed. Failure mode was observed with a stereomicroscope. The means of the repetitions from each group (n=10) were statistically analyzed (1-way ANOVA and Tukey test). Result: The mechanical cy...
Introduction: The occurrence of canine impaction is not a rare phenomenon, but transmigration of ... more Introduction: The occurrence of canine impaction is not a rare phenomenon, but transmigration of the tooth across the midline is a less common event. The finding is normally asymptomatic and the etiologic factors involved in the transmigration process are still unclear. Objective: To present a clinical case of surgical treatment of a transmigrated mandibular canine. Case report: A 17-year-old male patient presented to the dental clinic to remove an unerupted canine. Clinical and radiological examinations led to the diagnosis of a transmigrated canine in the mental region. Surgical removal was the treatment of choice and further radiographs were needed to complement the clinical exam and to determine the location of the tooth precisely for the surgical procedure. Postoperative period was uneventful. Canine transmigration is a rare finding and symptoms are usually absent. Conclusion: An early detection is important to plan the treatment and mainly to avoid future complications.
The Journal of Prosthetic Dentistry, 2020
STATEMENT OF PROBLEM Reasons for failures of bilayer yttria-stabilized tetragonal zirconia polycr... more STATEMENT OF PROBLEM Reasons for failures of bilayer yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) restorations include the core-veneer interface bond strength. The influence of the veneering method on the bond strength of veneered Y-TZP is unclear. PURPOSE The purpose of this systematic review and meta-analysis was to evaluate the effect of the veneering method on the bond strength of bilayer Y-TZP. MATERIAL AND METHODS This review followed the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) statement. Searches were performed on PubMed/MEDLINE, Web of Science (Core Collection), and Scopus for in vitro studies evaluating the effect of the veneering technique on the bond strength of bilayer Y-TZP. Statistical analyses were performed with random-effect models (α=.05). RESULTS From 619 identified studies, 140 were selected for full-text analysis and 16 were included. Manual searching yielded no additional articles. The meta-analyses comprised 15 studies, and 1 study was included only in the descriptive analysis. Meta-analyses compared the hand-layered method (control) with pressed, fused, and cemented veneering methods. The fused and cemented techniques were analyzed by using subgroups assessing the veneering ceramic type (predominantly glass-ceramics and particle-filled glass-ceramics). Similar bond strength results (P=.540) were found for pressed and hand-layered veneered Y-TZP specimens. Fused veneers achieved higher bond strength values (P<.001) than the hand-layered veneers on Y-TZP frameworks, irrespective of the veneering ceramic type (predominantly glass-ceramics: P=.002; particle-filled glass-ceramics: P<.001). Global and subgroup analyses indicated that lower core-veneer bond strength values (P<.001) were found for cemented in relation to hand-layered veneers. CONCLUSIONS Core-veneer interfacial adhesion was equivalent for pressed and hand-layered veneering techniques. Improved bond strength, regardless of the veneer ceramic material type, was achieved by the fused veneering method, which seems to be a promising choice for the veneering of Y-TZP. In contrast, the cemented method may be unsuitable for veneering Y-TZP structures because of its lower bond strength than the hand-layered veneering technique.
Brazilian Dental Journal, 2008
This study evaluated the fracture resistance of weakened roots restored with glass fiber posts, c... more This study evaluated the fracture resistance of weakened roots restored with glass fiber posts, composite resin cores and complete metal crowns. Thirty maxillary canines were randomly divided into 3 groups of 10 teeth each: teeth without weakened roots (control); teeth with partially weakened roots (PWR) and teeth with and largely weakened roots (LWR). The control group was restored with glass fiber posts and a composite resin core. Teeth in the PWR and LWR groups were flared internally to standardized dimensions in order to simulate root weakness. Thereafter, the roots were partially filled with composite resin and restored in the same way as in the control group. The specimens were exposed to 250,000 cycles in a controlled chewing simulator. All intact specimens were subjected to a static load (N) in a universal testing machine at 45 degrees to the long axis of the tooth until failure. Data were analyzed by one-way ANOVA and Dunnett's test for multiple comparisons (p=0.05). Th...
The Journal of Prosthetic Dentistry, 2017
Dental ceramics are widely used for esthetic restorative treatments owing to their desirable char... more Dental ceramics are widely used for esthetic restorative treatments owing to their desirable characteristics: color stability, translucency, tooth-like optical properties, mechanical resistance, durability, and compatibility with periodontal tissue. 1-4 A popular approach for esthetic treatments is the use of laminate veneers, which are indicated to increase tooth size, reduce diastemas, and to correct form and discoloration. 1,5 With the evolution of adhesive systems, resin cements and ceramic materials, it is now possible to attach 0.1-to 0.7-mm-thick ceramic laminate veneers with minimal or no tooth preparation. 1,3,6-8 The color stability of the luting agents influences the esthetic result of ceramic restorations, which is a determinant of long-term success, 3,6,9 especially in highly translucent restorations. 10,11 Any alteration of the cement color that results in a mismatch with the adjacent teeth is a reason for restoration replacement 6,12 and may be considered a treatment failure. 12
The Journal of prosthetic dentistry, Jan 21, 2018
Although several monolithic zirconia ceramics have recently been introduced, the need for improve... more Although several monolithic zirconia ceramics have recently been introduced, the need for improved optical properties remains. The newest cubic-zirconia has been claimed to have optimal translucency characteristics for esthetic restorations. This in vitro study evaluated the optical properties of novel cubic ultratranslucent (UT) and supertranslucent (ST) zirconia by comparing them with lithium disilicate (L-DIS) glass-ceramic for the manufacture of monolithic computer-aided design and computer-aided manufacturing (CAD-CAM) molar crowns. The UT and ST multilayered zirconia and the low-translucency grade L-DIS were milled. Eighty monolithic crowns were made from 2 CAD files, corresponding to thicknesses of 1.0 and 1.5 mm, and subdivided (n=20) into 4 groups: UT1.0, UT1.5, ST1.0, and L-DIS1.5. All groups were shaded using A2 color standard. Translucency of the crowns was measured by total transmission, using a photoradiometer in a dark chamber; furthermore, the contrast ratio was anal...
Brazilian Oral Research
The aim of this systematic review was to compare the clinical performance and failure modes of te... more The aim of this systematic review was to compare the clinical performance and failure modes of teeth restored with intra-radicular retainers. A search was performed on PubMed/Medline, Central and ClinicalTrials databases for randomized clinical trials comparing clinical behavior and failures of at least two types of retainers. From 341 detected papers, 16 were selected for full-text analysis, of which 9 met the eligibility criteria. A manual search added 2 more studies, totalizing 11 studies that were included in this review. Evaluated retainers were fiber (prefabricated and customized) and metal (prefabricated and cast) posts, and follow-up ranged from 6 months to 10 years. Most studies showed good clinical behavior for evaluated intra-radicular retainers. Reported survival rates varied from 71 to 100% for fiber posts and 50 to 97.1% for metal posts. Studies found no difference in the survival among different metal posts and most studies found no difference between fiber and metal posts. Two studies also showed that remaining dentine height, number of walls and ferrule increased the longevity of the restored teeth. Failures of fiber posts were mainly due to post loss of retention, while metal post failures were mostly related to root fracture, post fracture and crown and/or post loss of retention. In conclusion, metal and fiber posts present similar clinical behavior at short to medium term follow-up. Remaining dental structure and ferrule increase the survival of restored pulpless teeth. Studies with longer follow-up are needed.
Introdução e objetivo: O objetivo deste estudo foi identificar a presença de hábitos bucais delet... more Introdução e objetivo: O objetivo deste estudo foi identificar a presença de hábitos bucais deletérios e relacioná-la com a duração de aleitamento materno. Material e métodos: Foi realizado um estudo retrospectivo, utilizando-se dados secundários contidos em 143 prontuários de crianças entre 0 e 59 meses, assistidas em clínica pública de Odontopediatria. Nos prontuários, constavam perguntas sobre a presença de hábitos bucais e sua frequência, bem como o período de duração do aleitamento materno. Os dados foram analisados Palavras-chave: aleitamento materno; hábitos deletérios; prevalência.
Rsbo, Mar 1, 2010
... ASSOCIAÇÃO ENTRE DURAÇÃO DO ALEITAMENTO MATERNO E DISTOCLUSÃO NA DENTIÇÃO DECÍDUA DISSERTAÇÃO... more ... ASSOCIAÇÃO ENTRE DURAÇÃO DO ALEITAMENTO MATERNO E DISTOCLUSÃO NA DENTIÇÃO DECÍDUA DISSERTAÇÃO DE MESTRADO ... ADOLESCENTE ASSOCIAÇÃO ENTRE DURAÇÃO DO ALEITAMENTO MATERNO E DISTOCLUSÃO NA DENTIÇÃO DECÍDUA ...
Dental materials : official publication of the Academy of Dental Materials, 2016
A systematic review was conducted to assess the effects of air-particle abrasion procedures on th... more A systematic review was conducted to assess the effects of air-particle abrasion procedures on the mechanical strength and phase transformation of yttria-stabilized tetragonal zirconia polycrystal (Y-TZP). This report followed the PRISMA Statement. From 1013 eligible studies, 78 were selected for full-text analysis, from which 37 were excluded. The 41 remaining papers were included for the systematic review; hand-searching yielded three papers. The review comprised a total of 44 studies; 21 were included in the meta-analysis. Searches were performed with no publication year limit through November 2015 in PubMed/MEDLINE, Web of Science (Core Collection) and Scopus databases. In vitro studies evaluating the effect of air-particle abrasion protocols on the mechanical strength and/or phase transformation of Y-TZP zirconia specimens, immediately or after aging. For the meta-analysis, flexural strength data of air-particle abrasion vs. control (nonabraded) were globally and subgroup analy...
General dentistry
The purposes of the study were to evaluate the effect of mechanical cycling (MC) on the fracture ... more The purposes of the study were to evaluate the effect of mechanical cycling (MC) on the fracture resistance of endodontically treated weakened roots restored with different intraradicular retainers and to analyze the failure mode. Eighty bovine roots were prepared and restored: 20 roots were reconstructed with cast post-and-cores (CPCs); 20 with fiber posts (FPs); 20 with fiber posts with larger coronal diameter (FPLs); and 20 with anatomic posts (APs). Metal crowns were cemented in all the roots. Half of specimens from each restoration strategy (n = 10) were submitted to MC: CPC-MC, FP-MC, FPL-MC, and AP-MC. The specimens were subjected to a fracture resistance test. The results showed that the type of retainer used was statistically significant (P < 0.0004). The CPC specimens demonstrated a fracture resistance similar to that of the APs, but greater than that of the FPs and FPLs. MC was statistically significant (P < 0.003) and affected AP-MC fracture resistance, which was l...
Objective: To evaluate the influence of cycles’ frequency of mechanical fatigue on bond strength ... more Objective: To evaluate the influence of cycles’ frequency of mechanical fatigue on bond strength between glass fiber posts and root dentin. Method: 40 bovine roots were prepared in 10 mm with a custom drill of the fiber post system (white Post DC #2, FGM) and embedded in acrylic resin. The fiber posts were cemented into the root canals with a 2-steps etch&rinse adhesive system (Ambar, FGM) and resin cement (AllCem, FGM). The core was built up with composite resin. The specimens were divided in four groups according to the frequency of mechanical cycling (45° angle; 37°C; 88 N; 1 million cycles): G1- without mechanical cycling (control group); G2- 2Hz; G3- 4Hz; G4- 8Hz. After mechanical cycling, all the specimens were sectioned in 4 slices with a thickness of 2mm, and the push-out test was performed. Failure mode was observed with a stereomicroscope. The means of the repetitions from each group (n=10) were statistically analyzed (1-way ANOVA and Tukey test). Result: The mechanical cy...
Journal of Applied Oral Science, 2014
Introduction: The occurrence of canine impaction is not a rare phenomenon, but transmigration of ... more Introduction: The occurrence of canine impaction is not a rare phenomenon, but transmigration of the tooth across the midline is a less common event. The finding is normally asymptomatic and the etiologic factors involved in the transmigration process are still unclear. Objective: To present a clinical case of surgical treatment of a transmigrated mandibular canine. Case report: A 17-year-old male patient presented to the dental clinic to remove an unerupted canine. Clinical and radiological examinations led to the diagnosis of a transmigrated canine in the mental region. Surgical removal was the treatment of choice and further radiographs were needed to complement the clinical exam and to determine the location of the tooth precisely for the surgical procedure. Postoperative period was uneventful. Canine transmigration is a rare finding and symptoms are usually absent. Conclusion: An early detection is important to plan the treatment and mainly to avoid future complications.