Effects of first premolar extractions on third molar angulations / 华西口腔医学杂志
West China Journal of Stomatology
;
(6): 228-230, 2006.
Article
in Chinese
| WPRIM
| ID: wpr-288962
ABSTRACT
<p><b>OBJECTIVE</b>To compare the inclinations of third molars of patients treated orthodontically with and without premolar extractions.</p><p><b>METHODS</b>Records of 37 first premolar extraction patients and 32 nonextraction patients were examined. The pretreatment and posttreatment panoramic radiographs were analyzed. The angles were measured between the long axis of the third molar and the occlusal plane and between the long axis of the third molar and the long axis of the second molar. Changes in third molar angulations from pretreatment to posttreatment for two groups were compared by Mann-Whitney U-test.</p><p><b>RESULTS</b>There were statistically significant difference between the extraction and nonextraction groups in the median angle formed by the long axis of third molar angulation relative to the occlusal plane (P<0.05) and the second molar (P<0.05) in mandible but not in maxillary. In the extraction group, at the end of the orthodontic treatment, the mandibular third molars showed more uprighting than did the maxillary third molars.</p><p><b>CONCLUSION</b>Orthodontic treatment involving premolar extractions improves mandibular third molar angulations.</p>
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Tooth Extraction
/
Bicuspid
/
Radiography, Panoramic
/
Dental Occlusion
/
Mandible
/
Maxilla
/
Molar
/
Molar, Third
Limits:
Female
/
Humans
/
Male
Language:
Chinese
Journal:
West China Journal of Stomatology
Year:
2006
Type:
Article
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