Normative Data of Variables Determining Eruption of Third Molars in Orthodontic Patients – A Retrospective Study

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Authors

  • S. V. Soumya
     Associate Professor, Christian Medical College and Hospital (CMCH), Vellore - 632004, Tamil Nadu ,IN
  • Jagadish Ebenezer
     Professor, Christian Medical College and Hospital (CMCH), Vellore - 632004, Tamil Nadu ,IN
  • S. Mahasampath Gowri
     Lecturer (Biostatistics), Christian Medical College and Hospital (CMCH), Vellore - 632004, Tamil Nadu ,IN

DOI:

https://doi.org/10.18311/jpfa/2019/23510

Keywords:

Retrospective Study, Third Molars, Variables
Dental & Oral Surgery Department

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.

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Published

2019-06-28

How to Cite

Soumya, S. V., Ebenezer, J., & Gowri, S. M. (2019). Normative Data of Variables Determining Eruption of Third Molars in Orthodontic Patients – A Retrospective Study. Journal of Pierre Fauchard Academy (India Section), 33(2), 45–49. https://doi.org/10.18311/jpfa/2019/23510

Issue

Volume 33, Issue 2, June 2019

Section

Original Articles

License

All the articles published in JPFA are distributed under a creative commons license. The journal allows the author(s) to hold the copyright of their work (all usages allowed except for commercial purpose).

 

References

Dachi SF, Howell FV. A survey of 3874 routine fullmonth radiographs II. A study of impacted teeth. Oral Sur Oral Med Oral Pathol. 1961; 14:1165–1169. https://doi.org/10.1016/0030-4220(61)90204-3

Beeman CS. Third molar management : A case of routine removal in adolescent and young adult orthodontic patients. J Oral Maxillofac Surg. 2006;64:1816-1820.

Hyam DM. The contemporary management of third molars. Australian Dent J. 2018;63:(1 Suppl):S19–S26. https://doi.org/10.1111/adj.12587. PMid:29574809

Bjork A, Jenson E, Palling M. Mandibular growth and third molar impaction. Acta Odont Scand. 1956;14:231–271. https://doi.org/10.3109/00016355609019762

Hattab FN, Abu Alhaija ES, Radiographic evaluation of mandibular third molar eruption space. Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 1999;88:285–291. https:// doi.org/10.1016/S1079-2104(99)70029-6

Mollaoglu N, Centiner S, Gungor K. Patterns of third molar impaction in a group of volunteers in Turkey. Clin Oral Investig. 2006;6:109–113.https://doi.org/10.1007/s00784001-0144-1

Behbehani F, Artun J, Thalib L. Prediction of mandibular third molar impaction in adolescent orthodontic patients. Am J Othod Dentofac Othop. 2006;130:47–55.https://doi.org/10.1016/j.ajodo.2006.03.002. PMid:16849071

Richardson ME. The etiology and prediction of mandibular third molar eruption. Angle Orthod. 1977;47:165–172.

Prajapati VK, Mitra R, Vinayaka KM. Pattern of mandibular third molar impaction and its association to caries in mandibular second molar: A clinical variant. Dent Res J. 2017;14:137–142.

Alling CC, Helfrick JF, Alling RD. Impacted teeth. Philadelphia: WB Saunders; 1993. https://doi.org/10.1097/00008505-199312000-00021

Hattab FN, Rawashdeh MA, Fahmy MS.I mpaction status of third molars in Jordanian students. Oral Surg Oral Med Oral Path Oral Radio Endod. 1995;79;24–29. https://doi.org/10.1016/S1079-2104(05)80068-X

Amin K, Vasavi K, Vahanwala S, Nayak CD,Pagare SS,Ramdev SS. Co-relation of variables as determined from panoramic radiograph and evaluating their significance in eruption of permanent mandibular third molar. J Indian Acad Oral Med Radiol. 2008;20:14–18. https://doi.org/10.4103/0972-1363.44355