Journal of Pierre Fauchard Academy (India Section)

S. V. Soumya ¹, Jagadish Ebenezer ¹, B. Antonisamy ²

Affiliations
1 Department Dental and Oral Surgery II CMCH, Vellore, IN
2 Department of Biostatistics, CMCH, Vellore, IN

Abstract

Objectives:
1) To establish if a correlation exists between the position of the molar and anterior proclination of central incisors in Indian population.
2) To broaden our treatment options for gaining space to correct malocclusion. 3) Emphasise the importance of stable posterior occlusion.
Material and methods: The sample consisted of 400 lateral cephalograms of patients reported to CMCH, Vellore for diagnosis and treatment of malocclusion. The interincisal angle and the molar position in maxillae were measured using Kodak software and values were tabulated on Excel worksheets. All statistical analysis were done using Statistical Software STATA version 13.1.
Results: Regression coefficient indicates that 0.4% decrease in the interincisal angle (increase in proclination) for every unit increase in the molar position which is statistically significant at 5% level of significance. The interincisal angle will be 3% higher for male than female which is statistically not significant.
Conclusion:
1) Molar position in maxillae is affected by various factors and its position has an effect on anterior proclination with 0.4% decrease in interincisal angle for every unit increase in molar position which is statistically significant.
2) Anterior occlusion is dependent on posterior occlusion, hence a stable posterior occlusion is a requisite for stability of occlusion.
3) Since the anterior occlusion varies with posterior occlusion other modalities of treatment like distalization of molars and TAD's to decrease anchor loss can be an alternative/ addition to extraction protocol respectively.

Keywords

Upper Molars, Anterior Proclination, Retrospective Study.

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S. V. Soumya ¹, Jagadish Ebenezer ¹, S. Mahasampath Gowri ¹

Affiliations
1 Christian Medical College and Hospital (CMCH), Vellore - 632004, Tamil Nadu, IN

Abstract

Objectives: 1) To Formulate a normative data of variables affecting the eruption of third molar. 2) To help format a research data to compare variable changes occurring during formative and eruption stage (11-16 years)of third molar. Materials and Methods: The sample comprised of Orthodontic patients at CMCH from 2012-2019, within an age group of 11years -16 years, which was approved by the ethical committee. 40 Male and 40 Female Patient’s Orthopentogram with complete set of teeth were considered in the study. The measurements analysed were: 1) Retromolar space:is distal contact of PMM2(Permanent mandibular second molar) and junction of occlusal plane to the anterior border of the mandible. 2) Gonial Angle: angle between the tangent from inferior border of the mandible and posterior border of the mandible. 3) Mesiodistal width of second molar : greatest distance between mesial and distal portion of the crown. 4) Mesiodistal width of third molar: greatest distance between mesial and distal extension of the crown. 5) Angulation of first and second Molar : the angle formed between the long axis of PMM1 (Permanent mandibular first molar) and PMM2 (Angulation m1m2). 6) Angulation of second molar to base of Mandible: the angle formed between the long long axis of PMM2 and the tangent drawn to the inferior border of the mandible (Angulation m2bm). 7) Nolla’s classification of third Molar. Trophy Dicom; carestream LS 8000c machine programmed with Kodak software was used to record the digital OPG with standard protocol and head position. The 7 Variables were analysed with the Kodak software and the measurements were recorded on excel worksheet. Results: The Data was used for comparison of all variables to explore gender specific differences, only the mesiodistal width was significantly different between the gender. A descriptive table was formulated with a range of measurements for all variables. A correlation between Retromolar space and all other variables was analysed ,there is a positive correlation with formation of third molar(Nolla’s grading) and retromolar space in females and it is statistically significant. Though a weak ,correlation exists between other variable and retromolar space ,it was not statistically significant. Conclusion: 1) A normative data and Data for future research, of variables affecting the eruption of third molar in their formative and eruptive stage was Formulated. 2) Though a weak correlation exists between other variable and retromolar space during the formative and eruption stage of third molars.

Keywords

Retrospective Study, Third Molars, Variables.

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