Avaliação da angulação dos gérmenes dos terceiros molares através da análise de radiografias panorâmicas

  • Maria Beatriz Ferreira Vidal (Student)

Student thesis: Master's Thesis

Abstract

Introduction: The radiographic evaluation of the presence, position and developmental stage of the third molar can be useful for predicting the need of a germectomy. Objective: The aim of this study is to radiographically analyze the third molar tooth germ, describing its presence/absence and mineralization stage (Nolla’s developmental stages) and classify them according to their orientation (Winter’s classification) and angulation. Methodology: We conducted a cross-sectional observational analytical study by analysing 540 panoramic radiographs of patients with ages between 4 and 21 years old from ICS-Viseu’s University Dental Clinic. Results: In all third molars tooth germ Nolla’s stage 0 is observed in the age group up to 9 years and increases until the age group of 16-21 years. The evolution of upper third molars tooth germ begins earlier than that of the lower third molars tooth germ. The most common orientation in the upper third molars tooth germ was the vertical, then the distal. In the lower third molars tooth germ, the most common orientation were mesial and vertical. When using the angle formed between the occlusal plane of the third molar tooth germ and the long axis of the second molar, the average angle of the tooth 38 was 69º while the one of the tooth 48 was 66º. The average angle by angle formed between the long axis of third molar tooth germ and the long axis of the second molar, was 21º for the tooth 38 and 20º for the tooth 48. Conclusion: The evaluation of the need for germectomy should be considered for each patient with consistent criteria and methodologies for angulation and orientation of the third molar tooth germ.
Date of Award12 Dec 2016
Original languagePortuguese
Awarding Institution
  • Universidade Católica Portuguesa
SupervisorMariana Pinheiro Torres de Seabra (Supervisor) & Filipa Alexandra dos Santos Bexiga (Supervisor)

Keywords

  • Third molar tooth germ
  • Nolla’s developmental stages
  • Winter’s classification
  • Angulation

Designation

  • Mestrado em Medicina Dentária

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