IADR Abstract Archives
Frequency And Location Of Third Molar Agenesis
Objectives: To determine the frequency and location of third molar agenesis, comparing between men / women, maxilla / mandible and right / left side.
Methods: A sample of 300 digital panoramic radiographs of patients treated in the Radiology Service of the Dentistry School of Universidad Mayor was analyzed. 150 of these patients were female and 150 male. The statistical method used in this study was the Chi-square test. The inclusion criteria were: radiographs of patients between 14 and 25 years old, radiographic sign of the bone crypt, radiographic sign indicating an alveolar repair process indicative of recent tooth extraction.
Exclusion criteria were: radiographs outside the age range, poor quality radiographic records, radiographs from other radiographic centers, radiographs showing absence of at least 2 premolars per maxilla and / or mandible, evidencing signs of generalized apical root remodeling, or fixed orthodontic containment, which are indicators of previous orthodontic treatment, and patients with previous orthognathic surgery.
Results: The frequency of agenesis was 31%, evidencing no differences between men and women. No preference for arch was observed, neither for affected tooth or right and left sides. It was found a predilection for bilateral presentation. All the results were presented in tables and graphs (p = 0.05)
Conclusions: The third molars have been studied by several researchers, because, compared to other teeth, they present the greatest variation in morphology, anatomical position, time of development and eruption, besides presenting the highest global agenesis rate.
Methods: A sample of 300 digital panoramic radiographs of patients treated in the Radiology Service of the Dentistry School of Universidad Mayor was analyzed. 150 of these patients were female and 150 male. The statistical method used in this study was the Chi-square test. The inclusion criteria were: radiographs of patients between 14 and 25 years old, radiographic sign of the bone crypt, radiographic sign indicating an alveolar repair process indicative of recent tooth extraction.
Exclusion criteria were: radiographs outside the age range, poor quality radiographic records, radiographs from other radiographic centers, radiographs showing absence of at least 2 premolars per maxilla and / or mandible, evidencing signs of generalized apical root remodeling, or fixed orthodontic containment, which are indicators of previous orthodontic treatment, and patients with previous orthognathic surgery.
Results: The frequency of agenesis was 31%, evidencing no differences between men and women. No preference for arch was observed, neither for affected tooth or right and left sides. It was found a predilection for bilateral presentation. All the results were presented in tables and graphs (p = 0.05)
Conclusions: The third molars have been studied by several researchers, because, compared to other teeth, they present the greatest variation in morphology, anatomical position, time of development and eruption, besides presenting the highest global agenesis rate.