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:: Volume 31, Issue 2 (Spring 2013) ::
J Dent Sch GYEAR__, 31(2): 87-94 Back to browse issues page
Comparison of Changes inMandibular Third Molar AngulationFollowing First/Second Premolar Extraction versus Non-Extraction Orthodontic Treatments
Soodeh Tahmasbi Dr., Ladan Eslamian Dr., Massoud Seifi Dr., Mohammad Abbas Abdolsamadi Dr., Shideh Eslamy Yamchi Corresponding Author: Dr. *
Dentist , dr_eslamy@hotmail.com
Abstract:   (2353 Views)

Objective: Extraction of premolars is believed to affect the eruption of third molars. This comparative study aimed to assess the change in angulation of third molars following first/second premolar extraction versus non-extraction orthodontic treatments.

Methods: This historical cohort study was conducted on patients assigned to three treatment groups: extraction of mandibular first premolars (group A), extraction of mandibular second premolars (group B) and non-extraction orthodontic treatment (group C). Each group included 30 third molars. Patients were in the age range of 11-19 years and the third molars were in Nolla’s6-8 stage of tooth development. Pre- and post-treatment panoramic radiographs were analyzed.

Results: The angle between the long axis of the mandibular third molar and mandibular plane increased by 7±2.2° in group A and 5.2°in group B and the increase in both groups was statistically significant (P<0.05). Angular changes in group C were not statistically significant (P>0.05). The angle between the long axes of mandibular first and third molars decreased by 6.83±0.3° in group A. This reduction was statistically significant (P<0.05).

Conclusion: In extraction orthodontic treatments (versus non-extraction treatments), mandibular third molars tend to straighten up and become upright so the risk of their impaction may be decreased.

Keywords: Orthodontics, Third molar, Premolar, Tooth extraction, Mandible, Tooth angulation
Full-Text [PDF 179 kb]   (932 Downloads)    
Type of Study: Original Article | Subject: Special
Received: 2013/07/21 | Accepted: 2013/10/15 | Published: 2013/10/15
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Tahmasbi S, Eslamian L, Seifi M, Abdolsamadi M A, Eslamy Yamchi S. Comparison of Changes inMandibular Third Molar AngulationFollowing First/Second Premolar Extraction versus Non-Extraction Orthodontic Treatments . J Dent Sch. 2013; 31 (2) :87-94
URL: http://jds.sbmu.ac.ir/article-1-1132-en.html
Volume 31, Issue 2 (Spring 2013) Back to browse issues page
مجله دانشکده دندانپزشکی دانشگاه علوم پزشکی شهید بهشتی Shahid Beheshti University Dental Journal
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