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PubMed1997

[Orthodontic treatment for the surgical correction of mandibular skeletal retrognathism].

The purpose of this paper is to discuss the combining orthodontic treatment that is based on seventeen consecutive patients of severe mandibular skeletal retrognathism who have been treated by orthognathic surgery. Not only the presurgical preparation, but also the presurgical and postsurgical orthodontic treatment and the use of interocclusal splints were introduced. The goals of orthodontic treatment for patients with orthognathic surgery are (1) decompensating the teeth, expanding the upper dental arch, (2) aligning the teeth, (3) leveling the curve of Spee, (4) making the shape and width of upper and lower dental arch harmonious, (5) getting the occlusal equilibrium and fine occlusal contact. The author's experience indicates that: in order to get satisfactory results of esthetics and function, the combination of surgical and orthodontic treatment, the presurgical and postsurgical orthodontic treatment is absolutely necessary and important.

Adolescent↗
PubMed2006

Effects of functional orthodontic appliances in the correction of a primary anterior crossbite--changes in craniofacial morphology and tongue position.

Chin caps have been used for the correction of primary anterior crossbites, but previous studies of the treatment effects have highlighted problems such as pressure on the temporomandibular joint (TMJ). Therefore, to reduce pressure on the TMJ, a functional orthodontic appliance, the Yanagisawa Class III (YC3) shield was developed to improve the overjet in the primary dentition. The aim of this study was to determine the treatment effects of the YC3 in correcting a primary anterior crossbite compared with a chin cap. The pre- and post-treatment lateral cephalograms of 10 patients (5 male, 5 females) and 10 treated with a YC3 (5 males, 5 females) were compared in relation to craniofacial morphology and tongue position [the YC3 was used from 51 months of age +/- 7 months to 74 months of age +/- 12 months (i.e. for 23 +/- 9 months) and the chin cap from 53 months of age +/- 2 months to 75 months of age +/- 1 month (i.e. for 22 +/- 5 months)]. A Mann-Whitney U-test was used to determine any statistical differences. The YC3 group showed significantly higher values for gonial angle and U1 to SN (P < 0.05), and significantly lower values for interincisal and tongue position (P < 0.05), compared with the chin cap group. The results indicate that the use of the YC3 not only improves overjet, but also changes the tongue position. The findings also suggest that the YC3 results in functional effects on the skeletal system during the mid-growth period.

Cephalometry↗
PubMed1979

Cephalometric evaluation of surgical orthodontic treatment for the correction of anterior cross-bites.

Severe skeletal Class III malocclusion cases were treated by surgical orthodontic techniques. Surgical operations included alveolar osteotomy, horizontal osteotomy of the mandibular ramus, osteotomy of the mandibular body, and sagittal-split osteotomy of the mandibular ramus, according to the type of malocclusion. Comparisons between lateral cephalograms made before and after operation at the prognosis examination were made for the four surgical procedures.

Adolescent↗