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Shape-coordinate analysis of skeletal changes induced by rapid maxillary expansion and facial mask therapy.
Am J Orthod Dentofacial Orthop 1998; 114(4):418-26AJ

Abstract

The aim of this study was to evaluate maxillary and mandibular shape/size changes by means of Bookstein's shape-coordinate and tensor analysis in children with Class III malocclusions treated with rapid maxillary expansion and a facial mask in order to define optimum timing of intervention for this type of therapy. The treated group (46 subjects, 26 females and 20 males) was divided into two subgroups according to the stage of dentitional development. The early-treated group consisted of 23 subjects treated in the early mixed dentition (mean age at Time 1, 6 years 9 months +/- 7 months); the late-treated group included 23 subjects treated in the late mixed dentition (mean age at Time 1, 10 years 3 months +/- 1 year). The mean treatment period was about 11 months. The control group (32 subjects with untreated Class III malocclusion, 18 females and 14 males) also was divided into two subgroups (an early control group, 17 subjects in the early mixed dentition, and a late control group, 15 subjects in the late mixed dentition). Maxillary triangles (point T, the most superior point of the anterior wall of sella turcica, point FMN, the fronto-maxillary-nasal suture, and point A) and mandibular triangles (point Condylion, point Gonion, and point Pogonion) were digitized on cephalograms in both groups at Time 1 and Time 2. Combined facial mask and rapid maxillary expansion therapy produced a significant enhancement of the forward growth of the maxilla and significantly more upward and forward direction of growth of the mandibular condyle (leading to smaller increments in mandibular total length, Co-Pg) in the early-treated group when compared with controls and to the late-treated group. Both maxillary size and mandibular size were significantly affected by treatment in the early mixed dentition. The results of this study indicate that orthopedic treatment of Class III malocclusion induces favorable size and shape changes both in the maxilla and mandible, and that this combined treatment approach is more effective in the early mixed dentition than in the late mixed dentition.

Authors+Show Affiliations

Department of Orthodontics, The University of Florence, Italy. condax@tin.it

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

9790326

Citation

Franchi, L, et al. "Shape-coordinate Analysis of Skeletal Changes Induced By Rapid Maxillary Expansion and Facial 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. 114, no. 4, 1998, pp. 418-26.
Franchi L, Baccetti T, McNamara JA. Shape-coordinate analysis of skeletal changes induced by rapid maxillary expansion and facial mask therapy. Am J Orthod Dentofacial Orthop. 1998;114(4):418-26.
Franchi, L., Baccetti, T., & McNamara, J. A. (1998). Shape-coordinate analysis of skeletal changes induced by rapid maxillary expansion and facial 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, 114(4), pp. 418-26.
Franchi L, Baccetti T, McNamara JA. Shape-coordinate Analysis of Skeletal Changes Induced By Rapid Maxillary Expansion and Facial Mask Therapy. Am J Orthod Dentofacial Orthop. 1998;114(4):418-26. PubMed PMID: 9790326.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Shape-coordinate analysis of skeletal changes induced by rapid maxillary expansion and facial mask therapy. AU - Franchi,L, AU - Baccetti,T, AU - McNamara,J A,Jr PY - 1998/10/28/pubmed PY - 2001/3/28/medline PY - 1998/10/28/entrez SP - 418 EP - 26 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 - 114 IS - 4 N2 - The aim of this study was to evaluate maxillary and mandibular shape/size changes by means of Bookstein's shape-coordinate and tensor analysis in children with Class III malocclusions treated with rapid maxillary expansion and a facial mask in order to define optimum timing of intervention for this type of therapy. The treated group (46 subjects, 26 females and 20 males) was divided into two subgroups according to the stage of dentitional development. The early-treated group consisted of 23 subjects treated in the early mixed dentition (mean age at Time 1, 6 years 9 months +/- 7 months); the late-treated group included 23 subjects treated in the late mixed dentition (mean age at Time 1, 10 years 3 months +/- 1 year). The mean treatment period was about 11 months. The control group (32 subjects with untreated Class III malocclusion, 18 females and 14 males) also was divided into two subgroups (an early control group, 17 subjects in the early mixed dentition, and a late control group, 15 subjects in the late mixed dentition). Maxillary triangles (point T, the most superior point of the anterior wall of sella turcica, point FMN, the fronto-maxillary-nasal suture, and point A) and mandibular triangles (point Condylion, point Gonion, and point Pogonion) were digitized on cephalograms in both groups at Time 1 and Time 2. Combined facial mask and rapid maxillary expansion therapy produced a significant enhancement of the forward growth of the maxilla and significantly more upward and forward direction of growth of the mandibular condyle (leading to smaller increments in mandibular total length, Co-Pg) in the early-treated group when compared with controls and to the late-treated group. Both maxillary size and mandibular size were significantly affected by treatment in the early mixed dentition. The results of this study indicate that orthopedic treatment of Class III malocclusion induces favorable size and shape changes both in the maxilla and mandible, and that this combined treatment approach is more effective in the early mixed dentition than in the late mixed dentition. SN - 0889-5406 UR - https://www.unboundmedicine.com/medline/citation/9790326/Shape_coordinate_analysis_of_skeletal_changes_induced_by_rapid_maxillary_expansion_and_facial_mask_therapy_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0889540698002339 DB - PRIME DP - Unbound Medicine ER -