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Skeletal effects of early treatment of Class III malocclusion with maxillary expansion and face-mask therapy.
Am J Orthod Dentofacial Orthop 1998; 113(3):333-43AJ

Abstract

The effectiveness of maxillary expansion and face-mask therapy in children with Class III malocclusion was studied in a sample of 46 subjects in mixed dentition and compared with a control sample of 32 subjects with untreated Class III malocclusion. Treated and untreated samples were divided into early and late mixed-dentition groups to aid identification of the optimum timing of the orthopedic treatment of the underlying skeletal disharmony. Cephalometric analysis was based on a stable basicranial reference system, appropriate for longitudinal studies started in the early developmental ages. The level of significance for intergroup comparisons was set at a p value of 0.01. Significant forward displacement of the maxillary complex was found in the early-treatment group. The region of the pterygomaxillary suture, in particular, showed significant changes in the subjects treated during early mixed dentition. No significant maxillary modifications were recorded in the late-treatment group. Both early and late groups exhibited smaller increments in mandibular protrusion and larger increments in the intermaxillary vertical relationship compared with their respective Class III control groups. Only children treated at an early age, however, showed a significant upward and forward direction of condylar growth, leading to smaller increments in total mandibular length. These results indicate that the combination of a bonded maxillary expander and face-mask therapy is more effective in early mixed dentition than in late mixed dentition, especially with regard to the magnitude of the protraction effects on maxillary structures.

Authors+Show Affiliations

Department of Orthodontics, University of Florence, Italy. condax@tin.itNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

9517727

Citation

Baccetti, T, et al. "Skeletal Effects of Early Treatment of Class III Malocclusion With Maxillary Expansion and Face-mask Therapy." 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. 113, no. 3, 1998, pp. 333-43.
Baccetti T, McGill JS, Franchi L, et al. Skeletal effects of early treatment of Class III malocclusion with maxillary expansion and face-mask therapy. Am J Orthod Dentofacial Orthop. 1998;113(3):333-43.
Baccetti, T., McGill, J. S., Franchi, L., McNamara, J. A., & Tollaro, I. (1998). Skeletal effects of early treatment of Class III malocclusion with maxillary expansion and face-mask therapy. American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, 113(3), pp. 333-43.
Baccetti T, et al. Skeletal Effects of Early Treatment of Class III Malocclusion With Maxillary Expansion and Face-mask Therapy. Am J Orthod Dentofacial Orthop. 1998;113(3):333-43. PubMed PMID: 9517727.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Skeletal effects of early treatment of Class III malocclusion with maxillary expansion and face-mask therapy. AU - Baccetti,T, AU - McGill,J S, AU - Franchi,L, AU - McNamara,J A,Jr AU - Tollaro,I, PY - 1998/3/28/pubmed PY - 2001/3/28/medline PY - 1998/3/28/entrez SP - 333 EP - 43 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 - 113 IS - 3 N2 - The effectiveness of maxillary expansion and face-mask therapy in children with Class III malocclusion was studied in a sample of 46 subjects in mixed dentition and compared with a control sample of 32 subjects with untreated Class III malocclusion. Treated and untreated samples were divided into early and late mixed-dentition groups to aid identification of the optimum timing of the orthopedic treatment of the underlying skeletal disharmony. Cephalometric analysis was based on a stable basicranial reference system, appropriate for longitudinal studies started in the early developmental ages. The level of significance for intergroup comparisons was set at a p value of 0.01. Significant forward displacement of the maxillary complex was found in the early-treatment group. The region of the pterygomaxillary suture, in particular, showed significant changes in the subjects treated during early mixed dentition. No significant maxillary modifications were recorded in the late-treatment group. Both early and late groups exhibited smaller increments in mandibular protrusion and larger increments in the intermaxillary vertical relationship compared with their respective Class III control groups. Only children treated at an early age, however, showed a significant upward and forward direction of condylar growth, leading to smaller increments in total mandibular length. These results indicate that the combination of a bonded maxillary expander and face-mask therapy is more effective in early mixed dentition than in late mixed dentition, especially with regard to the magnitude of the protraction effects on maxillary structures. SN - 0889-5406 UR - https://www.unboundmedicine.com/medline/citation/9517727/Skeletal_effects_of_early_treatment_of_Class_III_malocclusion_with_maxillary_expansion_and_face_mask_therapy_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0889540698000584 DB - PRIME DP - Unbound Medicine ER -