Affiliation:
1. Department of Clinical Sciences and Translational Medicine, University of Rome “Tor Vergata”, Rome, Italy
2. Department of Orthodontics, University Zoja e Këshillit të Mirë, Tirane, Albania
Abstract
Summary
Objectives
To evaluate the mandibular modifications in anterior open bite (OB) growing subjects treated with Rapid Maxillary Expansion and bite block (RME/BB) or Quad Helix with crib (QH/C) when compared with a Control Group (CG) by using Geometric Morphometric Method (GMM) and conventional cephalometric.
Materials
The OB group comprised 34 subjects (26 girls, 8 boys) with dentoskeletal OB and a mean age of 8.0 ± 1.0 years. OB group was divided in two subgroups: RME/BB group comprised 17 subjects (13 girls, 4 boys), while QH/C group included 17 subjects (13 girls, 4 boys). The two subgroups were compared with a CG of 17 subjects (13 girls, 4 boys) matched for sex, age, vertical pattern, and observation periods. Two consecutives lateral cephalograms were available: the first one was taken before treatment (T1), and the second one was acquired at a follow-up observation at least 4 years after the completion of treatment (T2). Landmarks and semilandmarks were digitized on lateral cephalograms and GMM was applied. Procrustes analysis and principal component analysis were performed. Analysis of variance (ANOVA) with Tukey post hoc tests was used to compare the T2–T1 cephalometric changes between the RME/BB, QH/C, and CG.
Results
In the long term, RME/BB showed a significantly greater decrease of the Condylar axis to mandibular plane angle when compared to CG and QH/C. GMM showed an increased in height of the mandibular ramus in RME/BB group with tendency to counterclockwise rotation of the mandible when compared with QH/C and CG groups.
Conclusions
RME/BB subjects showed significant changes in the shape of the mandibular ramus with a counterclockwise rotation tendency when compared with QH/C and CG subjects.
Publisher
Oxford University Press (OUP)
Reference43 articles.
1. Open-bite;Worms;American Journal of Orthodontics,1971
2. Open bite: a review of etiology and management;Ngan;Pediatric Dentistry,1997
3. Stability of quad-helix/crib therapy in dentoskeletal open bite: a long-term controlled study;Mucedero;American Journal of Orthodontics and Dentofacial Orthopedics,2013
4. Sucking habits and facial hyperdivergency as risk factors for anterior open bite in the mixed dentition;Cozza;American Journal of Orthodontics and Dentofacial Orthopedics,2005
5. A review of anterior open bite;Mizrahi;British Journal of Orthodontics,1978
Cited by
6 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献