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Effects of rapid maxillary expansion in hyperdivergent patients.
Am J Orthod Dentofacial Orthop. 2012 Jul; 142(1):60-9.AJ

Abstract

INTRODUCTION

This retrospective cohort study was performed to evaluate the skeletal and dental changes in the short and long terms in hyperdivergent patients treated with rapid maxillary expansion and fixed appliances.

METHODS

The sample consisted of 143 patients who had rapid maxillary expansion with a Haas-type expander followed by edgewise therapy. Two groups were established: a normal vertical dimension group (mandibular plane angle >20° and <27°; n = 52) and a hyperdivergent group (mandibular plane angle ≥27°; n = 91). Lateral cephalograms were taken before treatment (average age, 11.5 years in both groups) and after fixed appliance therapy (average age, 14.3 years in both groups). Subjects who exhibited opening or closing in the mandibular plane angle during treatment greater than 1.5° (opening group, n = 23; closing group, n = 26) were followed in the long term (average age, 20.3 years). Longitudinal changes in the different groups were evaluated statistically as well as the prevalence rates of hyperdivergent patients in the opening and closing groups.

RESULTS

No significant differences in treatment effects were found in any sagittal or vertical dentoskeletal variables examined. The long-term evaluation of the patients at 5 or more years posttreatment showed no significant skeletal changes. The prevalence rate of hyperdivergent patients in the opening group was not significant.

CONCLUSIONS

The results of this study indicate that rapid maxillary expansion can be carried out successfully in patients with increased vertical dimensions without detrimental effects on the vertical skeletal relationships. Thus, an increased mandibular plane angle is not a contraindication for rapid maxillary expansion therapy.

Authors+Show Affiliations

Graduate Program in Orthodontics, Department of Orthodontics and Pediatric Dentistry, University of Michigan, Ann Arbor, MI 48109, USA.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

22748991

Citation

Lineberger, Matthew W., et al. "Effects of Rapid Maxillary Expansion in Hyperdivergent Patients." 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. 142, no. 1, 2012, pp. 60-9.
Lineberger MW, McNamara JA, Baccetti T, et al. Effects of rapid maxillary expansion in hyperdivergent patients. Am J Orthod Dentofacial Orthop. 2012;142(1):60-9.
Lineberger, M. W., McNamara, J. A., Baccetti, T., Herberger, T., & Franchi, L. (2012). Effects of rapid maxillary expansion in hyperdivergent patients. American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, 142(1), 60-9. https://doi.org/10.1016/j.ajodo.2012.02.019
Lineberger MW, et al. Effects of Rapid Maxillary Expansion in Hyperdivergent Patients. Am J Orthod Dentofacial Orthop. 2012;142(1):60-9. PubMed PMID: 22748991.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effects of rapid maxillary expansion in hyperdivergent patients. AU - Lineberger,Matthew W, AU - McNamara,James A, AU - Baccetti,Tiziano, AU - Herberger,Thomas, AU - Franchi,Lorenzo, PY - 2011/08/01/received PY - 2012/02/01/revised PY - 2012/02/01/accepted PY - 2012/7/4/entrez PY - 2012/7/4/pubmed PY - 2012/9/26/medline SP - 60 EP - 9 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 - 142 IS - 1 N2 - INTRODUCTION: This retrospective cohort study was performed to evaluate the skeletal and dental changes in the short and long terms in hyperdivergent patients treated with rapid maxillary expansion and fixed appliances. METHODS: The sample consisted of 143 patients who had rapid maxillary expansion with a Haas-type expander followed by edgewise therapy. Two groups were established: a normal vertical dimension group (mandibular plane angle >20° and <27°; n = 52) and a hyperdivergent group (mandibular plane angle ≥27°; n = 91). Lateral cephalograms were taken before treatment (average age, 11.5 years in both groups) and after fixed appliance therapy (average age, 14.3 years in both groups). Subjects who exhibited opening or closing in the mandibular plane angle during treatment greater than 1.5° (opening group, n = 23; closing group, n = 26) were followed in the long term (average age, 20.3 years). Longitudinal changes in the different groups were evaluated statistically as well as the prevalence rates of hyperdivergent patients in the opening and closing groups. RESULTS: No significant differences in treatment effects were found in any sagittal or vertical dentoskeletal variables examined. The long-term evaluation of the patients at 5 or more years posttreatment showed no significant skeletal changes. The prevalence rate of hyperdivergent patients in the opening group was not significant. CONCLUSIONS: The results of this study indicate that rapid maxillary expansion can be carried out successfully in patients with increased vertical dimensions without detrimental effects on the vertical skeletal relationships. Thus, an increased mandibular plane angle is not a contraindication for rapid maxillary expansion therapy. SN - 1097-6752 UR - https://www.unboundmedicine.com/medline/citation/22748991/Effects_of_rapid_maxillary_expansion_in_hyperdivergent_patients_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0889-5406(12)00353-8 DB - PRIME DP - Unbound Medicine ER -