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Dentoskeletal treatment changes in Class II subdivision malocclusions in submentovertex and posteroanterior radiographs.
Am J Orthod Dentofacial Orthop. 2004 Oct; 126(4):451-63.AJ

Abstract

The objective of this study was to evaluate the dentoskeletal changes consequent to orthodontic treatment in subjects with Class II subdivision malocclusions, treated with asymmetric extractions, compared with a normal-occlusion control group. The sample consisted of 3 groups, with 30 subjects in each: normal-occlusion subjects (group 1), untreated Class II subdivision subjects (group 2), and Class II subdivision patients treated with asymmetric extractions (group 3). All subjects had a full complement of permanent teeth at the beginning of treatment. The average ages of the subjects were 22.42, 15.76, and 18.57 years, respectively, in groups 1, 2, and 3. Measurements of relative differences in the spatial position of dental and skeletal bilateral landmarks were obtained from the submentovertex and posteroanterior cephalometric (PA) radiographs. The t test for independent samples was used to compare group 1 with groups 2 and 3 at different times. Results from the submentovertex radiograph showed that asymmetric extractions in Class II subdivision malocclusions will maintain the differences in the anteroposterior positions of right and left, maxillary and mandibular first molars, as would be expected with the treatment protocols used. There were no significant skeletal changes that could be attributed to the treatment approaches investigated or transverse collateral effects with the asymmetric mechanics used. It was also demonstrated that treatment of Class II subdivision malocclusions with asymmetric extractions produced corrections of maxillary and mandibular dental midline deviations with the midsagittal plane, without canting the occlusal plane or any other investigated horizontal plane, as seen in the PA radiograph. Treatment of Class II subdivision malocclusions with asymmetric extractions constitutes a beneficial approach to this problem.

Authors+Show Affiliations

Department of Orthodontics, Bauru Dental School, University of São Paulo, Brazil. jansong@travelnet.com.brNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Evaluation Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

15470348

Citation

Janson, Guilherme, et al. "Dentoskeletal Treatment Changes in Class II Subdivision Malocclusions in Submentovertex and Posteroanterior Radiographs." American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, vol. 126, no. 4, 2004, pp. 451-63.
Janson G, Cruz KS, Woodside DG, et al. Dentoskeletal treatment changes in Class II subdivision malocclusions in submentovertex and posteroanterior radiographs. Am J Orthod Dentofacial Orthop. 2004;126(4):451-63.
Janson, G., Cruz, K. S., Woodside, D. G., Metaxas, A., de Freitas, M. R., & Henriques, J. F. (2004). Dentoskeletal treatment changes in Class II subdivision malocclusions in submentovertex and posteroanterior radiographs. American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, 126(4), 451-63.
Janson G, et al. Dentoskeletal Treatment Changes in Class II Subdivision Malocclusions in Submentovertex and Posteroanterior Radiographs. Am J Orthod Dentofacial Orthop. 2004;126(4):451-63. PubMed PMID: 15470348.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Dentoskeletal treatment changes in Class II subdivision malocclusions in submentovertex and posteroanterior radiographs. AU - Janson,Guilherme, AU - Cruz,Karina Santana, AU - Woodside,Donald G, AU - Metaxas,Angelos, AU - de Freitas,Marcos Roberto, AU - Henriques,José Fernando Castanha, PY - 2004/10/8/pubmed PY - 2004/11/2/medline PY - 2004/10/8/entrez SP - 451 EP - 63 JF - American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics JO - Am J Orthod Dentofacial Orthop VL - 126 IS - 4 N2 - The objective of this study was to evaluate the dentoskeletal changes consequent to orthodontic treatment in subjects with Class II subdivision malocclusions, treated with asymmetric extractions, compared with a normal-occlusion control group. The sample consisted of 3 groups, with 30 subjects in each: normal-occlusion subjects (group 1), untreated Class II subdivision subjects (group 2), and Class II subdivision patients treated with asymmetric extractions (group 3). All subjects had a full complement of permanent teeth at the beginning of treatment. The average ages of the subjects were 22.42, 15.76, and 18.57 years, respectively, in groups 1, 2, and 3. Measurements of relative differences in the spatial position of dental and skeletal bilateral landmarks were obtained from the submentovertex and posteroanterior cephalometric (PA) radiographs. The t test for independent samples was used to compare group 1 with groups 2 and 3 at different times. Results from the submentovertex radiograph showed that asymmetric extractions in Class II subdivision malocclusions will maintain the differences in the anteroposterior positions of right and left, maxillary and mandibular first molars, as would be expected with the treatment protocols used. There were no significant skeletal changes that could be attributed to the treatment approaches investigated or transverse collateral effects with the asymmetric mechanics used. It was also demonstrated that treatment of Class II subdivision malocclusions with asymmetric extractions produced corrections of maxillary and mandibular dental midline deviations with the midsagittal plane, without canting the occlusal plane or any other investigated horizontal plane, as seen in the PA radiograph. Treatment of Class II subdivision malocclusions with asymmetric extractions constitutes a beneficial approach to this problem. SN - 0889-5406 UR - https://www.unboundmedicine.com/medline/citation/15470348/Dentoskeletal_treatment_changes_in_Class_II_subdivision_malocclusions_in_submentovertex_and_posteroanterior_radiographs_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0889540604004482 DB - PRIME DP - Unbound Medicine ER -