Abstract
Objective: To determine the maxillary and mandibular anterior dentoalveolar bone width, height and length (MxAW, MdAW, MxAH, MdAH, MxAL, and MdAL) in Thai female patients with skeletal open bite, normal bite and deep bite and to compare the differences in these dimensions after fixed orthodontic treatment. Materials and Methods: A total of 116 pairs of pre-orthodontic treatment (T1) and post-orthodontic treatment (T2) lateral cephalograms of female patients (mean age 19.16 years) were selected systematically from the department database and digitized using a customized cephalometric software program (Dentofacial planner version 5.32). Analysis of variance (ANOVA) and Scheffe’s test were used to assess the differences among vertical skeletal groups at the 95% level of confidence (P .05). All post-treatment dimensions, except MxAH, significantly decreased in open bite group, but only MxAL, MdAH and MdAL decreased significantly in deep bite group after treatment. Conclusion: All anterior dentoalveolar dimensions were significantly different among skeletal vertical groups. The anterior dentoalveolar dimensions were significantly decreased after orthodontic treatment in all vertical groups, except MxAH.
Highlights
Orthodontists have long been interested in the multitude of differences in the diagnosis, treatment, and treatment response between skeletal open bite and skeletal deep bite
The means and standard deviations of pre-treatment and posttreatment anterior dentoalveolar dimensions in skeletal open bite, normal bite and deep bite are presented in Tables 2, 3, and 4, respectively
The width of anterior dentoalveolus was narrowest in the skeletal open bite group and widest in the skeletal deep bite group
Summary
Orthodontists have long been interested in the multitude of differences in the diagnosis, treatment, and treatment response between skeletal open bite and skeletal deep bite. These two distinct types of facial form have been characterized in the literature as "hyperdivergent"(Sassouni,1962; Shudy, 1964) or “long face syndrome”(Schendel etal.,1976). The purposes of this study were to determine and compare the significant differences of the maxillary and mandibular anterior dentoalveolar bone width, height and length among skeletal open bite, normal bite and deep bite in Thai female subjects, and to determine the changes of these dimensions after tooth movement with conventional fixed orthodontic treatment in these three vertical groups. The hypothesis of the study was that there were no differences in dimensions and post-treatment changes of anterior dentoalveolar bone in female orthodontic patients with different vertical skeletal patterns
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