Influence of premolar extraction or non-extraction orthodontic therapy on the angular changes of mandibular third molars
Obaid A. AlShahrani; Bangalore H. Durgesh; Abdulaziz A. Alkheraif; Waleed D. Almalki; Kiran H. Komari Gowda; Manea Mohammed S. Balharith; Ahmad D. Almalki; Mohamed I. Hashem; Nada Yahya H. Motashesh
https://urn.fi/URN:NBN:fi-fe2021042718364
Tiivistelmä
Abstract Aim: To compare the angular changes of the third molars relative to the occlusal plane
and to the second molar long axis in extraction group and compare these changes with a non extraction
group.
Materials and methods: The study included pre and post treatment panoramic radiograph
records of 90 subjects treated by first premolar extractions and 90 subjects who had been treated
with non extraction orthodontic therapy (n=90). Two angular variables were measured. Firstly,
the angle between the long axis of the third molar and the occlusal plane (M3–OP) and secondly,
the angle between the long axis of the third molar and the long axis of the second molar (M3–M2).
Data were analyzed by paired and student’s t-test.
Result: The analyzed data to assess the changes in the third molar angulation from pretreatment
to post treatment did not vary significantly in both the groups (p<0.05). Both the groups showed
decreased angular values. The M3–OP angular difference was (7.3± 2.45) in extraction group as
compared to (5.85 ± 1.77) in non extraction group. The M3–M2 angular difference of (4.26
±3.11) in extraction group and (2.98 ±1.74) in non-extraction group was observed
Conclusion: Extraction of premolars did not demonstrate considerable changes on the angulation
of the third molars. The factors other than premolar extractions may influence the angulation
of the third molars.
Kokoelmat
- Rinnakkaistallenteet [19207]