Abstract
Introduction: The third molar tooth is of clinical interest to different specialties of dentistry. It is usually associated with different anomalies for example, malformation, impaction, agenesis etc. This tooth being the last tooth in its molar group; is the most commonly malformed teeth. Third molar agenesis is also associated with other dental anomalies and has significance from evolution point of view.Objective: To investigate the frequency of third molar agenesis and its relationship with different skeletal malocclusion patterns.Materials & Method: Pretreatment radiographs of 100 orthodontic patients between 12-17 years of age were collected. Third molar agenesis was calculated and patients’ skeleton malocclusion pattern was determined. Descriptive statistics and chi square test was performed to determine the pattern and potential relation.Result: Among 100 subjects, 26 were diagnosed with third molar (M3) agenesis, thus the overall prevalence was 26% in the given orthodontic patient sample. The frequency of M3 agenesis was shown to be greater in maxilla (61.5%) than that of mandible (11.5%) (p=0.001). The prevalence of M3 agenesis in subjects with Class I, II and III skeleton malocclusion was 30.3%, 14.3% and 34.4% respectively. Similarly, the order of frequency of M3 agenesis was two (46.2%), one (34.6%), four (11.5%) and three (7.7%) M3’s.Conclusion: Agenesis of third molar is found to be most common in skeletal Class III malocclusion with the highest prevalence in maxillary arch. Hence proving the inter-relationship between sagittal skeletal malocclusions and third molar agenesis among orthodontic patient sample.
Highlights
The third molar tooth is of clinical interest to different specialties of dentistry
There are very few studies done on different skeletal malocclusion types and third molar agenesis
Our aim of this study is to find the frequency of third molar agenesis and its relationship with different skeletal malocclusion patterns
Summary
One of the most common anomalies of human dentition is tooth agenesis or hypodontia, which is characterized by the developmental absence of one or more teeth.[1]. Acharya N, Paudel D, Kafle D: Pattern of Third Molar Agenesis among Patients with Different Skeletal Malocclusion. M3 agenesis can affect orthodontic treatment planning especially during the arch distalization.[14] There has been a faint linkage between the correlation of M3 and late mandibular crowding or relapse after active orthodontic therapy.[9] there are very few studies done on different skeletal malocclusion types and third molar agenesis. Our aim of this study is to find the frequency of third molar agenesis and its relationship with different skeletal malocclusion patterns. From the pretreatment radiograph pool, 100 radiographs of the patients with skeletal Class I, II and III malocclusion were randomly selected and enrolled into the study. Descriptive statistics as well as Chi Square test was applied to find out the pattern and relation of third molar agenesis in different malocclusion types. SPSS 16.00 software was used for the statistical analysis
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