Quantitative analysis of dental compensation for variations in sagittal jaw relationships

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The aim of this study was to evaluate dental compensation with variations in sagittal jaw relationships quantitatively. For this purpose, we examined seventy-three adult females with normal incisor relationships and a Class I molar relationship, and performed cephalometric analysis to evaluate sagittal jaw relationships, maxillary and mandibular incisor inclinations, and the cant of the occlusal planes. Our previous study had examined the sagittal jaw relationships of the subjects with skeletal class III and skeletal Class I only, but this time we extended from skeletal Class II to skeletal Class III categories. Correlation analysis was also performed between the skeletal and dental parameters and found that the most appropriate cephalometric parameters describing dental compensation quantitatively were SN-AB as a skeletal measurement and SN-U1, SN-L1, and SN-OP as dental measurements. With these parameters, a 1.0° shift in the sagittal jaw relationship from skeletal Class II to skeletal Class III, corresponds to the upper incisor inclining more labially by 0.6°, the lower incisor inclining more lingually by 1.1° and the occlusal plane flattening by 0.6°. We concluded that among the compensatory dentoalveolar changes lower incisor inclination and the cant of occlusal plane were strongly related to the sagittal jaw relationship and played an important role in obtaining a normal incisor relationship and a Class I molar relationships.
日本矯正歯科学会の論文

Quantitative analysis of dental compensation for variations in sagittal jaw relationships

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