Rahman Showkatbakhsh; Abdolreza Jamilian; Ladan Eslamian
Abstract
Aim: The main goal of this study was to compare the effects of a differently designed functional appliance (R-appliance) with a bionator treated group in Class II Division I (C1 II Div I) cases.Materials and Methods: 22 patients (12 girls, 10 boys) treated with R-Appliance were selected as experimental ...
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Aim: The main goal of this study was to compare the effects of a differently designed functional appliance (R-appliance) with a bionator treated group in Class II Division I (C1 II Div I) cases.Materials and Methods: 22 patients (12 girls, 10 boys) treated with R-Appliance were selected as experimental group. Control group consisted of 22 patients (11 boys, 11 girls) treated with a bionator. All of the patients had a C1 II Div I malocclusion due to mandibular deficiency. Lateral cephalograms were analyzed at the beginning (T1, T 1) and the end of the study (T 2, T 2).Results: Paired T-test showed that SNB significantly increased in both groups. The same test revealed that IMPA was reduced in the R-appliances treated group by 4.5°±3.5° (P<0.001) but it was increased by 1.9°±3.9° (P<0.03) in the bionator group. Analysis utilizing T-test showed that the inter group difference of IMPA was statistically significant (P<0.01). SNA showed an increase of 0.1°±1.6° (P<0.9) in the R-appliance treated group; while, it was decreased for 0.4°±0.9° (P<0.1) in the bionator treated group.
Conclusions: Both groups were successful in advancement of mandible; however, the R-appliance achieved this result without retroclination of the lower incisors.
Mohammad Hossein Razeghinejad; Rahman Showkatbakhsh
Abstract
Aim: To examine the effect of single jaw surgery (mandibular setback) on the vertical relationships of skeletal class III patients and also examine the relationship between these probable changes and occlusal plane angle.
Material and methods: The measurements were evaluated on the preoperative and ...
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Aim: To examine the effect of single jaw surgery (mandibular setback) on the vertical relationships of skeletal class III patients and also examine the relationship between these probable changes and occlusal plane angle.
Material and methods: The measurements were evaluated on the preoperative and postoperative cephalometric radiographs of 33 skeletal class III Patients, that preoperative lateral cephalograms were taken before surgery and after insertion of surgical stabilizing arch wires and the postoperative lateral cephalograms were taken before the starting of postoperative orthodontic treatment. Vertical relationships were measured by the analysis of Legan and Burstone.
Results: The results showed that sagittal correction of mandibular prognathism caused significant reduction of lower anterior facial height (p< 0.001, mean =1.8mm ±1.44mm), and no significant correlation was found between lower anterior facial height change and occlusal plane angle and the amount of setback lonely and with together.
Conclusion: After mandibular setback surgery lower anterior facial height was reduced significantly, but it is not possible to find a significant correlation between lower anterior facial height changes and occlusal plane angle and/or amount of mandibular setback, so no prediction is possible for lower anterior facial height changes after mandibular setback surgery. These issues have to be considered to reduce the incidence of this problem in a developing country such as ours (1.10 2006;1: 158-62).
