Long-term evaluation of Class II subdivision treatment with unilateral maxillary first molar extraction

Livas, Christos; Pandis, Nikolaos; Booij, Johan Willem; Katsaros, Christos; Ren, Yijin (2015). Long-term evaluation of Class II subdivision treatment with unilateral maxillary first molar extraction. Angle orthodontist, 85(5), pp. 757-763. Angle Orthodontists Research and Education Foundation 10.2319/071614-499.1

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OBJECTIVE To evaluate the long-term effects of asymmetrical maxillary first molar (M1) extraction in Class II subdivision treatment. MATERIALS AND METHODS Records of 20 Class II subdivision whites (7 boys, 13 girls; mean age, 13.0 years; SD, 1.7 years) consecutively treated with the Begg technique and M1 extraction, and 15 untreated asymmetrical Class II adolescents (4 boys, 11 girls; mean age, 12.2 years; SD, 1.3 years) were examined in this study. Cephalometric analysis and PAR assessment were carried out before treatment (T1), after treatment (T2), and on average 2.5 years posttreatment (T3) for the treatment group, and at similar time points and average follow-up of 1.8 years for the controls. RESULTS The adjusted analysis indicated that the maxillary incisors were 2.3 mm more retracted in relation to A-Pog between T1 and T3 (β  =  2.31; 95% CI; 0.76, 3.87), whereas the mandibular incisors were 1.3 mm more protracted (β  =  1.34; 95% CI; 0.09, 2.59), and 5.9° more proclined to the mandibular plane (β  =  5.92; 95% CI; 1.43, 10.41) compared with controls. The lower lip appeared 1.4 mm more protrusive relative to the subnasale-soft tissue-Pog line throughout the observation period in the treated adolescents (β  =  1.43; 95% CI; 0.18, 2.67). There was a significant PAR score reduction over the entire follow-up period in the molar extraction group (β  =  -6.73; 95% CI; -10.7, -2.7). At T2, 65% of the subjects had maxillary midlines perfectly aligned with the face. CONCLUSIONS Unilateral M1 extraction in asymmetrical Class II cases may lead to favorable occlusal outcomes in the long term without harming the midline esthetics and soft tissue profile.

Item Type:

Journal Article (Original Article)


04 Faculty of Medicine > School of Dental Medicine > Department of Orthodontics

UniBE Contributor:

Pandis, Nikolaos and Katsaros, Christos


600 Technology > 610 Medicine & health




Angle Orthodontists Research and Education Foundation




Eveline Carmen Schuler

Date Deposited:

14 Mar 2016 16:37

Last Modified:

25 Jan 2017 12:15

Publisher DOI:


PubMed ID:


Uncontrolled Keywords:

Cephalometrics Class II subdivisionm Maxillary first molar extraction, PAR





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