Dr.Shobha Sundareswaran - Academia.edu (original) (raw)
Papers by Dr.Shobha Sundareswaran
journal of orthodontic science
Indian Journal of Dental Research, 2017
Thirty-two adult oriental patients aged 18-26 years who sought treatment for their bimaxillary pr... more Thirty-two adult oriental patients aged 18-26 years who sought treatment for their bimaxillary protrusion were treated with the Begg appliance following extraction of four first premolars. A cephalometric study was undertaken to determine the soft tissue changes in lip profile following treatment. Results show that the upper incisors were retracted by 5.6 mm ± 0.8 mm and the lower incisors by 4.4 ± 0.8 mm on the average. The nasolabial angle became more obtuse increasing from 80.7° to 90.7°. The upper lip and lower lip lengthened by 1.9 mm and 1.2 mm, respectively. The lower lip to 'E' line reduced from 7.5 mm to 3.7 mm. All the previous changes were statistically significant (p<0.01). The upper lip to upper incisor retraction was 1:2.2 while the lower lip to lower incisor retraction was 1:1.4. The correlation coefficients (r) were 0.72 (p<0.01) and 0.80 (p<0.01), respectively. The changes in the cants of mandibular and occlusal planes were statistically insignificant. This study shows that the Begg appliance has the ability to significantly reduce bimaxillary protrusions and thereby improve facial aesthetics.
Turkish Journal of Orthodontics, Jun 27, 2019
Objective: A frontal evaluation of the lips could provide important information during a routine ... more Objective: A frontal evaluation of the lips could provide important information during a routine clinical evaluation of facial aesthetics. There is a lack of ample evidence in the literature regarding variations in the vermilion height and lip area in various sagittal discrepancies when assessing facial aesthetics. The aim of this cross-sectional study was to evaluate and compare the vermilion height and lip area in dentoskeletal Class I, Class II, and Class III malocclusions. Methods: Subjects included female patients divided into four groups (Angle's Class I bimaxillary proclination [Class I BMP], Class II Division I [Class II Div 1], Class III and Class I normal [Class I N]) with 36 samples each. Standardized frontal facial photographs were taken at rest and during a posed smile. Thirty-five landmarks on the upper and lower lips were identified for measurements of the vermilion height and lip area. A one-way analysis of variance was used to identify overall differences, and the post-hoc Bonferroni test was applied for multiple comparisons. Results: Class III showed a significantly smaller upper-lip area and significantly higher ratios of the upper-to-lower lip vermilion height/area. The ratios displayed an increasing trend from the midline to the corners of the mouth. Class I BMP and Class II Div 1 had significantly larger upper and lower-lip areas. Conclusion: Morphology of the lips is significantly correlated with underlying anteroposterior dentoskeletal discrepancies. During a clinical examination, a critical frontal evaluation of the lips is important as it is apparently indicative of the underlying sagittal discrepancy, especially in skeletal Class III malocclusions.
Iranian journal of orthodontics, Feb 18, 2019
The sella turcica is considered an important landmark in orthodontics as it is used extensively i... more The sella turcica is considered an important landmark in orthodontics as it is used extensively in various cephalometric analyses be it for diagnosis, evaluation of growth or treatment results. In order to recognize deviations from the norm, one needs to be familiar with normal radiographic anatomy as well as morphologic variability. A review of the literature was conducted regarding the norms and variations in size, shape, morphology and bridging of the sella turcica as evidenced by cephalometric evaluation. Literature search was carried out using the following keywords: Sella Turcica, Sella Bridging, Sella Size and Morphology. Search engines: PubMed and Google Scholar were utilised, followed by hand search. The purpose of the review is to provide an insight into detection of subclinical and potentially pathologic conditions during regular orthodontic pretreatment assessments.
The Journal of Indian Orthodontic Society, 2014
Newer materials have been introduced in the field of ortho dontics to improve clinical efficacy ... more Newer materials have been introduced in the field of ortho dontics to improve clinical efficacy as well as to simplify the tech nique. In an effort to reduce the time and steps to bond ortho dontic attachments, adhesive precoated (APC) brackets were introduced. In this study, an attempt is made to evaluate the shear bond strength (SBS) and debonding behavior of APC brackets compared with uncoated ceramic brackets. A total of 60 human premolar teeth were divided into two groups of 30 each, bonded with APC ceramic brackets and uncoated ceramic brackets. Group I bonded with APC brackets as pres cribed by the manufacturers and group II was bonded with con ventional bonding using Turbobond. After bonding, sthe samples were kept in distilled water at 37°C for 24 hours and a universal testing mechine was used to apply an occlusal shear force at a speed of 0.5 mm/min. The shear bond strength of the groups was compared using Student ttest and the debonding behavior were compared using MannWhitney’s U test. Mean shear bond strength and standard deviation of the groups were group I 9.09 ± 2.5 MPa and group II 12.95 ± 2.81 MPa. There were significant differences in bond strength observed between the two groups. The debonding behavior showed an adhesive remnant index score of 0.90 ± 0.08 for group I and 1.10 ± 0.04 for group II, which indicates there is significant difference between each other. When considering the values required for optimum bond strength, APC brackets in this study showed adequate bond strength and could be used for routine clinical use.
Journal of orthodontic science, 2015
Uprighting springs, an integral part of the Begg ligsht wire differential force technique is gain... more Uprighting springs, an integral part of the Begg ligsht wire differential force technique is gaining more and more popularity, as a useful adjunct in contemporary preadjusted edgewise appliance systems as well. It can be used with brackets containing vertical slots for mesiodistal crown uprighting, or as braking auxiliaries providing additional anchorage while protracting posteriors. Here, we present a simple and quick chair side method of fabricating and customizing uprighting springs according to the required crown/root movement for correction. This communication would serve as a ready reckoner during fabrication of the springs, thus dispelling the confusion that usually arises regarding direction and position of the coil and active arm.
Orthodontics, 2013
The aim of this study was to evaluate the effect of different methods of ligation in tie configur... more The aim of this study was to evaluate the effect of different methods of ligation in tie configurations on friction in dry and wet conditions. Methods: Four methods of ligations were used: regular round tie, figure eight, twist, and diagonal. Materials used were Alastik (3M Unitek), Power O module (ORMCO), O-ring ligatures (JES), stainless steel ligatures (TP Orthodontics), 0.019 × 0.025-inch straight-length stainless steel archwires and stainless steel MBT 0.022-inch slot brackets (3M Unitek). Results: Figure eight ligation had the highest friction, followed by round, twist, and diagonal ligation, in the descending order. Comparisons were statistically significant with a 100-g load. Dry group samples had higher friction than the wet group. These comparisons were statistically significant with a 50-g load. Conclusions: The study concluded that figure eight ligation had the highest friction, and diagonal ligation produced the least friction. Among the dry and wet groups, lubrication showed significant reduction in friction. OrthOdOntics (chic) 2013;14:e102-e109.
American Journal of Orthodontics and Dentofacial Orthopedics, Oct 1, 2021
INTRODUCTION This study aimed to evaluate the craniofacial effects of microimplant assisted rapid... more INTRODUCTION This study aimed to evaluate the craniofacial effects of microimplant assisted rapid palatal expansion (MARPE) on bone-anchored maxillary protraction (BAMP) through a finite element analysis. METHODS A 3-dimensional finite element model of the skull with associated sutures was created from the computed tomography image of a 12-year-old male patient. Two protraction protocols: BAMP without MARPE (protocol 1) and BAMP with MARPE (protocol 2), were analyzed using Ansys software (Ansys, Canonsburg, Pa). Stress distribution in the sutures and displacement pattern of craniofacial structures were analyzed in the 2 protocols using finite element analysis. RESULTS Both protocols produced changes in craniofacial structures in all the 3 planes. Displacement of the maxilla was more pronounced in protocol 2 in all directions with mild clockwise rotation. Protocol 1 displayed a translatory movement of the maxilla without any rotation and mild constriction in the anterior region. In protocol 2, an expansion of the maxilla, which increased in the superoinferior direction, was also observed. Von Mises stress in circummaxillary sutures was significantly more in protocol 2, indicating an increased displacement of craniomaxillary structures. CONCLUSIONS The use of MARPE during BAMP enhanced maxillary protraction and reduced the counterclockwise rotation tendency of the maxilla. Hence, it may be inferred that incorporation of MARPE during BAMP protocol may prove beneficial in the treatment of patients with skeletal Class III malocclusion with open bite tendency or hyperdivergent growth pattern.
journal of orthodontic science
European Journal of Orthodontics, 1989
Thirty-two adult oriental patients aged 18-26 years who sought treatment for their bimaxillary pr... more Thirty-two adult oriental patients aged 18-26 years who sought treatment for their bimaxillary protrusion were treated with the Begg appliance following extraction of four first premolars. A cephalometric study was undertaken to determine the soft tissue changes in lip profile following treatment. Results show that the upper incisors were retracted by 5.6 mm ± 0.8 mm and the lower incisors by 4.4 ± 0.8 mm on the average. The nasolabial angle became more obtuse increasing from 80.7° to 90.7°. The upper lip and lower lip lengthened by 1.9 mm and 1.2 mm, respectively. The lower lip to 'E' line reduced from 7.5 mm to 3.7 mm. All the previous changes were statistically significant (p<0.01). The upper lip to upper incisor retraction was 1:2.2 while the lower lip to lower incisor retraction was 1:1.4. The correlation coefficients (r) were 0.72 (p<0.01) and 0.80 (p<0.01), respectively. The changes in the cants of mandibular and occlusal planes were statistically insignificant. This study shows that the Begg appliance has the ability to significantly reduce bimaxillary protrusions and thereby improve facial aesthetics.
Journal of Contemporary Orthodontics
Correction of rotated teeth requires significant time and efforts with conventional mechanics. Un... more Correction of rotated teeth requires significant time and efforts with conventional mechanics. Unwanted iatrogenic effects may also occur on the teeth adjacent to the rotated teeth if not undertaken correctly. The time taken for derotation of teeth can also add to the overall treatment time. In this article, we are presenting a simple clinical technique using a hypodermic needle for faster and more efficient derotation of teeth. This technique has been found to be useful in correction of even severely rotated teeth.
Journal of Orthodontics
Objective: To develop a tool to facilitate simple, easy and rapid assessment of the level of diff... more Objective: To develop a tool to facilitate simple, easy and rapid assessment of the level of difficulty in disimpaction of an impacted canine using cone-beam computed tomography (CBCT). Design: A cross-sectional study. Methods: A panel of four experienced orthodontists formulated a questionnaire capable of portraying the limits of a three-dimensional (3D) area around impacted maxillary canines on CBCT images, which would determine the disimpaction difficulty level. In total, 14 experienced orthodontists graded each item in the questionnaire and assigned scores in the range of 0–5. Average scores obtained outlined the limits of a 3D area, within which an impaction was deemed favourable. This area was termed ‘Easy box’. The disimpaction difficulty level of 170 impacted maxillary canines was then assessed using ‘Easy box’ and the existing tool KPG index for convergent validation. Results: Perfect inter-examiner agreement was obtained as evidenced by Fleiss kappa value of 0.984 for the ...
Turkish Journal of Orthodontics, 2022
Orthodontics, 2012
The relationship of anterior cranial base to midface dimensions in skeletal Class III malocclusio... more The relationship of anterior cranial base to midface dimensions in skeletal Class III malocclusions is said to be unclear. The purpose of this retrospective study was to investigate and correlate various cephalometric parameters depicting anterior cranial base and cranial base flexure to maxillary dimensions in skeletal Class III malocclusions. Lateral cephalometric radiographs of 60 skeletal Class III subjects aged 16 to 29 years comprising 30 cases with maxillary retrusion (group A) and 30 cases with normal maxillae (group B) were analyzed for 14 variables, along with 60 skeletal Class I controls (group C) matched for both age and sex. The Bonferroni multiple comparison and ANOVA tests revealed a statistically significant decrease of maxillary (Co-A, Ptm-A, ANS-PNS) and anterior cranial base (S-N, S-Ca) linear dimensions (P < .001) as well as a decrease in N-S-Co (P < .001) and N-S-Ar (P < .05) in group A subjects. Comparison of ratios of the skeletal dimensions to each o...
Orthodontics, 2012
To evaluate the shear bond strength of orthodontic brackets bonded to porcelain surfaces using a ... more To evaluate the shear bond strength of orthodontic brackets bonded to porcelain surfaces using a recently introduced adhesive containing 10-methacryloyloxydecyle dihydrogen phosphate (10-MDP) (Panavia F2) and comparing it with two other bonding systems, Transbond XT and Fuji Ortho LC. Three groups, each consisting of 20 porcelain premolars, were bonded with metal orthodontic brackets (0.022 MBT) using 10-MDP (group I), Transbond XT (group II), and Fuji Ortho LC (group III). All ceramic surfaces were etched with 9.6% hydrofluoric acid followed by application of a silane coupling agent prior to bonding. All specimens were stored in artificial saliva at 37°C for 24 hours and thermocycled between 5°C and 55°C for 500 cycles before debonding with an Instron universal testing machine. The shear bond strength, adhesive remnant index, and sites of bond failure were recorded. Differences between the groups were statistically analyzed using ANOVA, Tukey HSD, and Pearson chi-square tests. Grou...
AIM To evaluate the shear bond strength of orthodontic brackets bonded to porcelain surfaces usin... more AIM To evaluate the shear bond strength of orthodontic brackets bonded to porcelain surfaces using a recently introduced adhesive containing 10-methacryloyloxydecyle dihydrogen phosphate (10-MDP) (Panavia F2) and comparing it with two other bonding systems, Transbond XT and Fuji Ortho LC. METHODS Three groups, each consisting of 20 porcelain premolars, were bonded with metal orthodontic brackets (0.022 MBT) using 10-MDP (group I), Transbond XT (group II), and Fuji Ortho LC (group III). All ceramic surfaces were etched with 9.6% hydrofluoric acid followed by application of a silane coupling agent prior to bonding. All specimens were stored in artificial saliva at 37°C for 24 hours and thermocycled between 5°C and 55°C for 500 cycles before debonding with an Instron universal testing machine. The shear bond strength, adhesive remnant index, and sites of bond failure were recorded. Differences between the groups were statistically analyzed using ANOVA, Tukey HSD, and Pearson chi-square...
American Journal of Orthodontics and Dentofacial Orthopedics
journal of orthodontic science
OBJECTIVE: To evaluate the skeletal, dental and soft tissue cephalometric changes by addition of ... more OBJECTIVE: To evaluate the skeletal, dental and soft tissue cephalometric changes by addition of daytime Class III elastics to the Alternate Rapid Maxillary Expansion-Constriction (AltRAMEC) and Reverse Headgear (RH) protocol in skeletal Class III patients with maxillary retrusion. MATERIAL AND METHODS: 54 patients with maxillary retrusion and CVMI (Cervical vertebral maturity index) <CS3 were randomly allocated to an AltRAMEC/RH group (group 1) and AltRAMEC/RH/Class III elastics group (group 2). Each group underwent 5 weeks of AltRAMEC using bonded RME (Rapid Maxillary Expansion) appliance, followed by reverse headgear therapy with a Petit type facemask for 4-5 months. The protraction so obtained was maintained by the use of daytime Class III elastics in group 2. A total of twenty skeletal, dental and soft tissue parameters were evaluated by a blinded examiner. Results were evaluated statistically. RESULTS: Significant forward movement of the maxilla with counter-clockwise rotation, improved intermaxillary relationships, downward and backward movement of the mandible, and favourable soft tissue changes were observed in both the groups under study. The results were more pronounced in group 2. Increase in vertical dimensions, proclination of maxillary and retroclination of mandibular incisors was also observed. Statistically significant differences were present between the two groups for all of the maxillary and mandibular skeletal, intermaxillary and two of the soft tissue parameters tested; while the differences were not found to be significant for dental parameters. CONCLUSION: Addition of Class III elastics to the AltRAMEC/RH protocol yielded more pronounced, favourable and statistically significant results.
JOURNAL OF CLINICAL AND DIAGNOSTIC RESEARCH, 2019
journal of orthodontic science
Indian Journal of Dental Research, 2017
Thirty-two adult oriental patients aged 18-26 years who sought treatment for their bimaxillary pr... more Thirty-two adult oriental patients aged 18-26 years who sought treatment for their bimaxillary protrusion were treated with the Begg appliance following extraction of four first premolars. A cephalometric study was undertaken to determine the soft tissue changes in lip profile following treatment. Results show that the upper incisors were retracted by 5.6 mm ± 0.8 mm and the lower incisors by 4.4 ± 0.8 mm on the average. The nasolabial angle became more obtuse increasing from 80.7° to 90.7°. The upper lip and lower lip lengthened by 1.9 mm and 1.2 mm, respectively. The lower lip to 'E' line reduced from 7.5 mm to 3.7 mm. All the previous changes were statistically significant (p<0.01). The upper lip to upper incisor retraction was 1:2.2 while the lower lip to lower incisor retraction was 1:1.4. The correlation coefficients (r) were 0.72 (p<0.01) and 0.80 (p<0.01), respectively. The changes in the cants of mandibular and occlusal planes were statistically insignificant. This study shows that the Begg appliance has the ability to significantly reduce bimaxillary protrusions and thereby improve facial aesthetics.
Turkish Journal of Orthodontics, Jun 27, 2019
Objective: A frontal evaluation of the lips could provide important information during a routine ... more Objective: A frontal evaluation of the lips could provide important information during a routine clinical evaluation of facial aesthetics. There is a lack of ample evidence in the literature regarding variations in the vermilion height and lip area in various sagittal discrepancies when assessing facial aesthetics. The aim of this cross-sectional study was to evaluate and compare the vermilion height and lip area in dentoskeletal Class I, Class II, and Class III malocclusions. Methods: Subjects included female patients divided into four groups (Angle's Class I bimaxillary proclination [Class I BMP], Class II Division I [Class II Div 1], Class III and Class I normal [Class I N]) with 36 samples each. Standardized frontal facial photographs were taken at rest and during a posed smile. Thirty-five landmarks on the upper and lower lips were identified for measurements of the vermilion height and lip area. A one-way analysis of variance was used to identify overall differences, and the post-hoc Bonferroni test was applied for multiple comparisons. Results: Class III showed a significantly smaller upper-lip area and significantly higher ratios of the upper-to-lower lip vermilion height/area. The ratios displayed an increasing trend from the midline to the corners of the mouth. Class I BMP and Class II Div 1 had significantly larger upper and lower-lip areas. Conclusion: Morphology of the lips is significantly correlated with underlying anteroposterior dentoskeletal discrepancies. During a clinical examination, a critical frontal evaluation of the lips is important as it is apparently indicative of the underlying sagittal discrepancy, especially in skeletal Class III malocclusions.
Iranian journal of orthodontics, Feb 18, 2019
The sella turcica is considered an important landmark in orthodontics as it is used extensively i... more The sella turcica is considered an important landmark in orthodontics as it is used extensively in various cephalometric analyses be it for diagnosis, evaluation of growth or treatment results. In order to recognize deviations from the norm, one needs to be familiar with normal radiographic anatomy as well as morphologic variability. A review of the literature was conducted regarding the norms and variations in size, shape, morphology and bridging of the sella turcica as evidenced by cephalometric evaluation. Literature search was carried out using the following keywords: Sella Turcica, Sella Bridging, Sella Size and Morphology. Search engines: PubMed and Google Scholar were utilised, followed by hand search. The purpose of the review is to provide an insight into detection of subclinical and potentially pathologic conditions during regular orthodontic pretreatment assessments.
The Journal of Indian Orthodontic Society, 2014
Newer materials have been introduced in the field of ortho dontics to improve clinical efficacy ... more Newer materials have been introduced in the field of ortho dontics to improve clinical efficacy as well as to simplify the tech nique. In an effort to reduce the time and steps to bond ortho dontic attachments, adhesive precoated (APC) brackets were introduced. In this study, an attempt is made to evaluate the shear bond strength (SBS) and debonding behavior of APC brackets compared with uncoated ceramic brackets. A total of 60 human premolar teeth were divided into two groups of 30 each, bonded with APC ceramic brackets and uncoated ceramic brackets. Group I bonded with APC brackets as pres cribed by the manufacturers and group II was bonded with con ventional bonding using Turbobond. After bonding, sthe samples were kept in distilled water at 37°C for 24 hours and a universal testing mechine was used to apply an occlusal shear force at a speed of 0.5 mm/min. The shear bond strength of the groups was compared using Student ttest and the debonding behavior were compared using MannWhitney’s U test. Mean shear bond strength and standard deviation of the groups were group I 9.09 ± 2.5 MPa and group II 12.95 ± 2.81 MPa. There were significant differences in bond strength observed between the two groups. The debonding behavior showed an adhesive remnant index score of 0.90 ± 0.08 for group I and 1.10 ± 0.04 for group II, which indicates there is significant difference between each other. When considering the values required for optimum bond strength, APC brackets in this study showed adequate bond strength and could be used for routine clinical use.
Journal of orthodontic science, 2015
Uprighting springs, an integral part of the Begg ligsht wire differential force technique is gain... more Uprighting springs, an integral part of the Begg ligsht wire differential force technique is gaining more and more popularity, as a useful adjunct in contemporary preadjusted edgewise appliance systems as well. It can be used with brackets containing vertical slots for mesiodistal crown uprighting, or as braking auxiliaries providing additional anchorage while protracting posteriors. Here, we present a simple and quick chair side method of fabricating and customizing uprighting springs according to the required crown/root movement for correction. This communication would serve as a ready reckoner during fabrication of the springs, thus dispelling the confusion that usually arises regarding direction and position of the coil and active arm.
Orthodontics, 2013
The aim of this study was to evaluate the effect of different methods of ligation in tie configur... more The aim of this study was to evaluate the effect of different methods of ligation in tie configurations on friction in dry and wet conditions. Methods: Four methods of ligations were used: regular round tie, figure eight, twist, and diagonal. Materials used were Alastik (3M Unitek), Power O module (ORMCO), O-ring ligatures (JES), stainless steel ligatures (TP Orthodontics), 0.019 × 0.025-inch straight-length stainless steel archwires and stainless steel MBT 0.022-inch slot brackets (3M Unitek). Results: Figure eight ligation had the highest friction, followed by round, twist, and diagonal ligation, in the descending order. Comparisons were statistically significant with a 100-g load. Dry group samples had higher friction than the wet group. These comparisons were statistically significant with a 50-g load. Conclusions: The study concluded that figure eight ligation had the highest friction, and diagonal ligation produced the least friction. Among the dry and wet groups, lubrication showed significant reduction in friction. OrthOdOntics (chic) 2013;14:e102-e109.
American Journal of Orthodontics and Dentofacial Orthopedics, Oct 1, 2021
INTRODUCTION This study aimed to evaluate the craniofacial effects of microimplant assisted rapid... more INTRODUCTION This study aimed to evaluate the craniofacial effects of microimplant assisted rapid palatal expansion (MARPE) on bone-anchored maxillary protraction (BAMP) through a finite element analysis. METHODS A 3-dimensional finite element model of the skull with associated sutures was created from the computed tomography image of a 12-year-old male patient. Two protraction protocols: BAMP without MARPE (protocol 1) and BAMP with MARPE (protocol 2), were analyzed using Ansys software (Ansys, Canonsburg, Pa). Stress distribution in the sutures and displacement pattern of craniofacial structures were analyzed in the 2 protocols using finite element analysis. RESULTS Both protocols produced changes in craniofacial structures in all the 3 planes. Displacement of the maxilla was more pronounced in protocol 2 in all directions with mild clockwise rotation. Protocol 1 displayed a translatory movement of the maxilla without any rotation and mild constriction in the anterior region. In protocol 2, an expansion of the maxilla, which increased in the superoinferior direction, was also observed. Von Mises stress in circummaxillary sutures was significantly more in protocol 2, indicating an increased displacement of craniomaxillary structures. CONCLUSIONS The use of MARPE during BAMP enhanced maxillary protraction and reduced the counterclockwise rotation tendency of the maxilla. Hence, it may be inferred that incorporation of MARPE during BAMP protocol may prove beneficial in the treatment of patients with skeletal Class III malocclusion with open bite tendency or hyperdivergent growth pattern.
journal of orthodontic science
European Journal of Orthodontics, 1989
Thirty-two adult oriental patients aged 18-26 years who sought treatment for their bimaxillary pr... more Thirty-two adult oriental patients aged 18-26 years who sought treatment for their bimaxillary protrusion were treated with the Begg appliance following extraction of four first premolars. A cephalometric study was undertaken to determine the soft tissue changes in lip profile following treatment. Results show that the upper incisors were retracted by 5.6 mm ± 0.8 mm and the lower incisors by 4.4 ± 0.8 mm on the average. The nasolabial angle became more obtuse increasing from 80.7° to 90.7°. The upper lip and lower lip lengthened by 1.9 mm and 1.2 mm, respectively. The lower lip to 'E' line reduced from 7.5 mm to 3.7 mm. All the previous changes were statistically significant (p<0.01). The upper lip to upper incisor retraction was 1:2.2 while the lower lip to lower incisor retraction was 1:1.4. The correlation coefficients (r) were 0.72 (p<0.01) and 0.80 (p<0.01), respectively. The changes in the cants of mandibular and occlusal planes were statistically insignificant. This study shows that the Begg appliance has the ability to significantly reduce bimaxillary protrusions and thereby improve facial aesthetics.
Journal of Contemporary Orthodontics
Correction of rotated teeth requires significant time and efforts with conventional mechanics. Un... more Correction of rotated teeth requires significant time and efforts with conventional mechanics. Unwanted iatrogenic effects may also occur on the teeth adjacent to the rotated teeth if not undertaken correctly. The time taken for derotation of teeth can also add to the overall treatment time. In this article, we are presenting a simple clinical technique using a hypodermic needle for faster and more efficient derotation of teeth. This technique has been found to be useful in correction of even severely rotated teeth.
Journal of Orthodontics
Objective: To develop a tool to facilitate simple, easy and rapid assessment of the level of diff... more Objective: To develop a tool to facilitate simple, easy and rapid assessment of the level of difficulty in disimpaction of an impacted canine using cone-beam computed tomography (CBCT). Design: A cross-sectional study. Methods: A panel of four experienced orthodontists formulated a questionnaire capable of portraying the limits of a three-dimensional (3D) area around impacted maxillary canines on CBCT images, which would determine the disimpaction difficulty level. In total, 14 experienced orthodontists graded each item in the questionnaire and assigned scores in the range of 0–5. Average scores obtained outlined the limits of a 3D area, within which an impaction was deemed favourable. This area was termed ‘Easy box’. The disimpaction difficulty level of 170 impacted maxillary canines was then assessed using ‘Easy box’ and the existing tool KPG index for convergent validation. Results: Perfect inter-examiner agreement was obtained as evidenced by Fleiss kappa value of 0.984 for the ...
Turkish Journal of Orthodontics, 2022
Orthodontics, 2012
The relationship of anterior cranial base to midface dimensions in skeletal Class III malocclusio... more The relationship of anterior cranial base to midface dimensions in skeletal Class III malocclusions is said to be unclear. The purpose of this retrospective study was to investigate and correlate various cephalometric parameters depicting anterior cranial base and cranial base flexure to maxillary dimensions in skeletal Class III malocclusions. Lateral cephalometric radiographs of 60 skeletal Class III subjects aged 16 to 29 years comprising 30 cases with maxillary retrusion (group A) and 30 cases with normal maxillae (group B) were analyzed for 14 variables, along with 60 skeletal Class I controls (group C) matched for both age and sex. The Bonferroni multiple comparison and ANOVA tests revealed a statistically significant decrease of maxillary (Co-A, Ptm-A, ANS-PNS) and anterior cranial base (S-N, S-Ca) linear dimensions (P < .001) as well as a decrease in N-S-Co (P < .001) and N-S-Ar (P < .05) in group A subjects. Comparison of ratios of the skeletal dimensions to each o...
Orthodontics, 2012
To evaluate the shear bond strength of orthodontic brackets bonded to porcelain surfaces using a ... more To evaluate the shear bond strength of orthodontic brackets bonded to porcelain surfaces using a recently introduced adhesive containing 10-methacryloyloxydecyle dihydrogen phosphate (10-MDP) (Panavia F2) and comparing it with two other bonding systems, Transbond XT and Fuji Ortho LC. Three groups, each consisting of 20 porcelain premolars, were bonded with metal orthodontic brackets (0.022 MBT) using 10-MDP (group I), Transbond XT (group II), and Fuji Ortho LC (group III). All ceramic surfaces were etched with 9.6% hydrofluoric acid followed by application of a silane coupling agent prior to bonding. All specimens were stored in artificial saliva at 37°C for 24 hours and thermocycled between 5°C and 55°C for 500 cycles before debonding with an Instron universal testing machine. The shear bond strength, adhesive remnant index, and sites of bond failure were recorded. Differences between the groups were statistically analyzed using ANOVA, Tukey HSD, and Pearson chi-square tests. Grou...
AIM To evaluate the shear bond strength of orthodontic brackets bonded to porcelain surfaces usin... more AIM To evaluate the shear bond strength of orthodontic brackets bonded to porcelain surfaces using a recently introduced adhesive containing 10-methacryloyloxydecyle dihydrogen phosphate (10-MDP) (Panavia F2) and comparing it with two other bonding systems, Transbond XT and Fuji Ortho LC. METHODS Three groups, each consisting of 20 porcelain premolars, were bonded with metal orthodontic brackets (0.022 MBT) using 10-MDP (group I), Transbond XT (group II), and Fuji Ortho LC (group III). All ceramic surfaces were etched with 9.6% hydrofluoric acid followed by application of a silane coupling agent prior to bonding. All specimens were stored in artificial saliva at 37°C for 24 hours and thermocycled between 5°C and 55°C for 500 cycles before debonding with an Instron universal testing machine. The shear bond strength, adhesive remnant index, and sites of bond failure were recorded. Differences between the groups were statistically analyzed using ANOVA, Tukey HSD, and Pearson chi-square...
American Journal of Orthodontics and Dentofacial Orthopedics
journal of orthodontic science
OBJECTIVE: To evaluate the skeletal, dental and soft tissue cephalometric changes by addition of ... more OBJECTIVE: To evaluate the skeletal, dental and soft tissue cephalometric changes by addition of daytime Class III elastics to the Alternate Rapid Maxillary Expansion-Constriction (AltRAMEC) and Reverse Headgear (RH) protocol in skeletal Class III patients with maxillary retrusion. MATERIAL AND METHODS: 54 patients with maxillary retrusion and CVMI (Cervical vertebral maturity index) <CS3 were randomly allocated to an AltRAMEC/RH group (group 1) and AltRAMEC/RH/Class III elastics group (group 2). Each group underwent 5 weeks of AltRAMEC using bonded RME (Rapid Maxillary Expansion) appliance, followed by reverse headgear therapy with a Petit type facemask for 4-5 months. The protraction so obtained was maintained by the use of daytime Class III elastics in group 2. A total of twenty skeletal, dental and soft tissue parameters were evaluated by a blinded examiner. Results were evaluated statistically. RESULTS: Significant forward movement of the maxilla with counter-clockwise rotation, improved intermaxillary relationships, downward and backward movement of the mandible, and favourable soft tissue changes were observed in both the groups under study. The results were more pronounced in group 2. Increase in vertical dimensions, proclination of maxillary and retroclination of mandibular incisors was also observed. Statistically significant differences were present between the two groups for all of the maxillary and mandibular skeletal, intermaxillary and two of the soft tissue parameters tested; while the differences were not found to be significant for dental parameters. CONCLUSION: Addition of Class III elastics to the AltRAMEC/RH protocol yielded more pronounced, favourable and statistically significant results.
JOURNAL OF CLINICAL AND DIAGNOSTIC RESEARCH, 2019