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A retrospective study of Angle Class I malocclusions treated orthodontically without extractions using two palatal expansion methods.
Am J Orthod Dentofacial Orthop. 1999 Jul; 116(1):101-7.AJ

Abstract

The correction and relapse of mandibular anterior crowding was evaluated in a population of 58 patients with Angle Class I malocclusion who were treated orthodontically without extraction of permanent teeth. The subjects were retrospectively evaluated from records taken before treatment, posttreatment, and postretention. The postretention period averaged 8 years (minimum of 4 and maximum of 20 years). All cases in Groups A and B were given orthopedic treatment to develop the maxillary apical base in the transverse and anteroposterior planes. Group A was treated with expansion of the inner bow of the face bow appliance (Kloehn), and Group B was treated with the Haas palatal expansion appliance. Both groups were then treated orthodontically with tandem mechanics. The response variables measured were: overbite, overjet, intercanine distance, intermolar distance, and irregularity index. Study groups A and B were not significantly different for subject age, retention, or postretention time. Moreover, the groups did not show significant difference for any of the response variables before treatment. However, there was a statistically significant difference in the treatment times (P =.0133). A statistically significant treatment effect was observed for most response variables in the groups. Overbite, overjet, and irregularity index were significantly reduced, intermolar distance was significantly increased, and intercanine distance showed no significant change in Groups A and B. In the postretention period, there was a tendency for variables to change slightly toward their before treatment values but no compromise of orthodontic correction was noted. The irregularity index in Group A was corrected from 4.8 to 1.1 mm and remained at 1.1 mm in the postretention period. The irregularity index in Group B was corrected from 5.1 to 1.2 mm (P =.0001) and changed slightly from 1. 2 to 1.7 mm (P =.0540) in the postretention period. We concluded that mandibular incisors tended to become more crowded postretention. However, in contrast to previous reports, we calculate this relapse to be small. Neither before treatment nor posttreatment variables were predictive of relapse.

Authors+Show Affiliations

Orthodontic Department, School of Dentistry, Medical College of Georgia, Augusta 30912-1241, USA.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

10393587

Citation

Azizi, M, et al. "A Retrospective Study of Angle Class I Malocclusions Treated Orthodontically Without Extractions Using Two Palatal Expansion Methods." 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. 116, no. 1, 1999, pp. 101-7.
Azizi M, Shrout MK, Haas AJ, et al. A retrospective study of Angle Class I malocclusions treated orthodontically without extractions using two palatal expansion methods. Am J Orthod Dentofacial Orthop. 1999;116(1):101-7.
Azizi, M., Shrout, M. K., Haas, A. J., Russell, C. M., & Hamilton, E. H. (1999). A retrospective study of Angle Class I malocclusions treated orthodontically without extractions using two palatal expansion methods. American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, 116(1), 101-7.
Azizi M, et al. A Retrospective Study of Angle Class I Malocclusions Treated Orthodontically Without Extractions Using Two Palatal Expansion Methods. Am J Orthod Dentofacial Orthop. 1999;116(1):101-7. PubMed PMID: 10393587.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A retrospective study of Angle Class I malocclusions treated orthodontically without extractions using two palatal expansion methods. AU - Azizi,M, AU - Shrout,M K, AU - Haas,A J, AU - Russell,C M, AU - Hamilton,E H,Jr PY - 1999/7/7/pubmed PY - 2001/3/28/medline PY - 1999/7/7/entrez SP - 101 EP - 7 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 - 116 IS - 1 N2 - The correction and relapse of mandibular anterior crowding was evaluated in a population of 58 patients with Angle Class I malocclusion who were treated orthodontically without extraction of permanent teeth. The subjects were retrospectively evaluated from records taken before treatment, posttreatment, and postretention. The postretention period averaged 8 years (minimum of 4 and maximum of 20 years). All cases in Groups A and B were given orthopedic treatment to develop the maxillary apical base in the transverse and anteroposterior planes. Group A was treated with expansion of the inner bow of the face bow appliance (Kloehn), and Group B was treated with the Haas palatal expansion appliance. Both groups were then treated orthodontically with tandem mechanics. The response variables measured were: overbite, overjet, intercanine distance, intermolar distance, and irregularity index. Study groups A and B were not significantly different for subject age, retention, or postretention time. Moreover, the groups did not show significant difference for any of the response variables before treatment. However, there was a statistically significant difference in the treatment times (P =.0133). A statistically significant treatment effect was observed for most response variables in the groups. Overbite, overjet, and irregularity index were significantly reduced, intermolar distance was significantly increased, and intercanine distance showed no significant change in Groups A and B. In the postretention period, there was a tendency for variables to change slightly toward their before treatment values but no compromise of orthodontic correction was noted. The irregularity index in Group A was corrected from 4.8 to 1.1 mm and remained at 1.1 mm in the postretention period. The irregularity index in Group B was corrected from 5.1 to 1.2 mm (P =.0001) and changed slightly from 1. 2 to 1.7 mm (P =.0540) in the postretention period. We concluded that mandibular incisors tended to become more crowded postretention. However, in contrast to previous reports, we calculate this relapse to be small. Neither before treatment nor posttreatment variables were predictive of relapse. SN - 0889-5406 UR - https://www.unboundmedicine.com/medline/citation/10393587/A_retrospective_study_of_Angle_Class_I_malocclusions_treated_orthodontically_without_extractions_using_two_palatal_expansion_methods_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0889-5406(99)70309-4 DB - PRIME DP - Unbound Medicine ER -