The study of the relationship between curve of Spee and malocclusions in Taiwanese adults using 3D digital dental models and lateral cephalogram

• Main Authors: Yu-Hsin Lee, 李祐欣
• Other Authors: Yu-Chuan Tseng
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/537f8n

碩士 === 高雄醫學大學 === 牙醫學系碩士班 === 106 === Purpose: The purpose of this study was to evaluate the relationship between the depth of the curve of Spee (CoS) and the different type of malocclusion in the adult population of Taiwanese, to determine whether the depth of the CoS is affected by different skeletal pattern or dental relation. Material and methods: Ninety lateral cephalograms and digital models of untreated patients were included and assigned to 3 malocclusion groups as Angle’s Class I, Class II and Class III malocclusion. The depth of the CoS and dental measurement were measured on digital models by 3shape OrthoAnalyzerTM. Liner and angular measurements on digital lateral cephalograms by Viewbox3® will also be carried out. Multiple liner regression and other statical analysis were used to detect the correlation between CoS and lateral cephalometric analysis. Results: No significant differences were found in the depth of CoS between male and female or right and left side in all malocclusion. The depth of CoS was greatest in the Class II malocclusion followed by Class I and Class III malocclusion. There’s no significant correlation between cephalomateric analysis and the depth of CoS in Class I malocclusion. However, in Class II malocclusion, SNA and SN-FH were significant associated with CoS; In Class III malocclusion, Cd-Gn was significantly correlated with the CoS. In dental model analysis, overbite was the only one which significantly correlated with CoS in all malocclusion. Overjet also significantly associated with CoS in Class II malocclusion. Conclusion: The depth of CoS was greatest in the Class II malocclusion followed by Class I and Class III malocclusion. The CoS is influenced only to a minor extent by dentofacial morphology. Multiple linear regression analysis showed that the curve of Spee in the mandibular arch is significantly influenced by overbite.