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Effects of orthodontic treatment on mandibular rotation and displacement in Angle Class II division 1 malocclusions.
Angle Orthod. 2004 Apr; 74(2):174-83.AO

Abstract

The aim of this retrospective cephalometric study was to investigate the effects of orthodontic treatment on rotation and displacement of the mandible in Angle Class II, division 1 malocclusions. Thirty patients in the treated group (15 boys and 15 girls; mean age at pretreatment, 12.27 +/- 1.36 years) were compared with 28 subjects who had untreated Class II, division 1 malocclusions (15 boys and 13 girls; mean age at T1, 12.01 +/- 0.07 years). The patients in the first group were treated nonsurgically, without extraction, and without the use of functional appliances. Cephalometric data were obtained from three lateral cephalograms per case representing pretreatment (T1), posttreatment (T2), and at least 2-years postretention (T3). Thirty-seven variables were measured representing craniofacial morphology, tooth measurements, and mandibular displacement. Some variables were obtained from cranial base, maxillary, or mandibular superimposition. Statistical significance was established at P < .05, P < .01, and P < .001. The findings indicated that orthodontic treatment of Class II, division 1 malocclusions induced a more vertical mandibular growth direction associated with an increased vertical displacement of pogonion. Occlusal or vertical movement of maxillary and mandibular molars was not correlated to mandibular rotation or horizontal displacement of pogonion. When compared with controls, the treated group did not exhibit a significant difference in mandibular rotation or occlusal movement of maxillary molars; however, it did show a greater occlusal movement of mandibular molars during treatment.

Authors+Show Affiliations

Department of Orthodontics, School of Dentistry, University of Illinois, Chicago, Ill, USA. xuanlanphan@hotmail.comNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

15132443

Citation

Phan, Xuan Lan, et al. "Effects of Orthodontic Treatment On Mandibular Rotation and Displacement in Angle Class II Division 1 Malocclusions." The Angle Orthodontist, vol. 74, no. 2, 2004, pp. 174-83.
Phan XL, Schneider BJ, Sadowsky C, et al. Effects of orthodontic treatment on mandibular rotation and displacement in Angle Class II division 1 malocclusions. Angle Orthod. 2004;74(2):174-83.
Phan, X. L., Schneider, B. J., Sadowsky, C., & BeGole, E. A. (2004). Effects of orthodontic treatment on mandibular rotation and displacement in Angle Class II division 1 malocclusions. The Angle Orthodontist, 74(2), 174-83.
Phan XL, et al. Effects of Orthodontic Treatment On Mandibular Rotation and Displacement in Angle Class II Division 1 Malocclusions. Angle Orthod. 2004;74(2):174-83. PubMed PMID: 15132443.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effects of orthodontic treatment on mandibular rotation and displacement in Angle Class II division 1 malocclusions. AU - Phan,Xuan Lan, AU - Schneider,Bernard J, AU - Sadowsky,Cyril, AU - BeGole,Ellen A, PY - 2004/5/11/pubmed PY - 2004/7/3/medline PY - 2004/5/11/entrez SP - 174 EP - 83 JF - The Angle orthodontist JO - Angle Orthod VL - 74 IS - 2 N2 - The aim of this retrospective cephalometric study was to investigate the effects of orthodontic treatment on rotation and displacement of the mandible in Angle Class II, division 1 malocclusions. Thirty patients in the treated group (15 boys and 15 girls; mean age at pretreatment, 12.27 +/- 1.36 years) were compared with 28 subjects who had untreated Class II, division 1 malocclusions (15 boys and 13 girls; mean age at T1, 12.01 +/- 0.07 years). The patients in the first group were treated nonsurgically, without extraction, and without the use of functional appliances. Cephalometric data were obtained from three lateral cephalograms per case representing pretreatment (T1), posttreatment (T2), and at least 2-years postretention (T3). Thirty-seven variables were measured representing craniofacial morphology, tooth measurements, and mandibular displacement. Some variables were obtained from cranial base, maxillary, or mandibular superimposition. Statistical significance was established at P < .05, P < .01, and P < .001. The findings indicated that orthodontic treatment of Class II, division 1 malocclusions induced a more vertical mandibular growth direction associated with an increased vertical displacement of pogonion. Occlusal or vertical movement of maxillary and mandibular molars was not correlated to mandibular rotation or horizontal displacement of pogonion. When compared with controls, the treated group did not exhibit a significant difference in mandibular rotation or occlusal movement of maxillary molars; however, it did show a greater occlusal movement of mandibular molars during treatment. SN - 0003-3219 UR - https://www.unboundmedicine.com/medline/citation/15132443/Effects_of_orthodontic_treatment_on_mandibular_rotation_and_displacement_in_Angle_Class_II_division_1_malocclusions_ L2 - https://meridian.allenpress.com/angle-orthodontist/article-lookup/doi/10.1043/0003-3219(2004)074&lt;0174:EOOTOM&gt;2.0.CO;2 DB - PRIME DP - Unbound Medicine ER -