Li Linlin, Chen Hu, Wang Yong, Sun Yuchun
Faculty of Prosthodontics, Center of Digital Dentistry, Peking University School and Hospital of Stomatology & National Engineering Laboratory for Digital and Material Technology of Stomatology & Research Center of Engineering and Technology for Digital Dentistry of Ministry of Health & Beijing Key Laboratory of Digital Stomatology & National Clinical Research Center for Oral Diseases, Beijing, China.
J Oral Rehabil. 2021 Jun;48(6):701-710. doi: 10.1111/joor.13153. Epub 2021 Feb 4.
Common impressions cannot accurately duplicate the dental occlusion under occlusal force due to tooth displacement and mandibular deformation. To establish new methods to construct virtual intercuspal occlusion and assess their construction accuracy. The intraoral occlusal contacts of posterior teeth of 15 subjects were recorded with 8 μm and 100 μm articulating paper, respectively, and the marked teeth and buccal bite data were scanned with an intraoral scanner. The virtual dental occlusions were separately determined by buccal bite registration (BBR) method, and 3 new methods, namely segmented tooth registration (STR), occlusal contact areas (marked by 8 μm articulating paper) registration (OCR) and mixing registration (MR) methods. With the intraoral contact areas marked by 100 μm articulating paper set as reference and contact areas of the 4 virtual occlusions as tests, sensitivity, positive predictive value (PPV) and the ratio of overlapping areas were calculated. Kruskal-Wallis test or 1-way ANOVA was used to analyse the difference among groups. The sensitivity ranged from 0.69 to 0.94 and the PPV from 0.67 to 0.90. Sensitivity of OCR group and PPV of STR and OCR groups were different from that of BBR group at overlapping threshold of 50% (P = .028, .028 and .006). There was statistical difference of the ratio of overlapping areas over reference areas, and the values of STR and OCR groups were higher than that of BBR group (P = .045 and .021). The ability of STR and OCR methods to construct virtual intercuspal occlusion was better than BBR method.
由于牙齿移位和下颌变形，普通印模无法在咬合力量下准确复制牙合关系。为建立构建虚拟牙尖交错位咬合的新方法并评估其构建准确性。分别用8μm和100μm的咬合纸记录15名受试者后牙的口内咬合接触情况，并用口内扫描仪扫描标记的牙齿和颊侧咬合数据。通过颊侧咬合记录（BBR）方法以及3种新方法，即分段牙齿记录（STR）、咬合接触区域（用8μm咬合纸标记）记录（OCR）和混合记录（MR）方法分别确定虚拟牙合。以100μm咬合纸标记的口内接触区域为参照，以4种虚拟咬合的接触区域为测试对象，计算敏感度、阳性预测值（PPV）和重叠区域比例。采用Kruskal-Wallis检验或单因素方差分析来分析组间差异。敏感度范围为0.69至0.94，PPV范围为0.67至0.90。在重叠阈值为50%时，OCR组的敏感度以及STR组和OCR组的PPV与BBR组不同（P = 0.028、0.028和0.006）。重叠区域与参照区域的比例存在统计学差异，STR组和OCR组的值高于BBR组（P = 0.045和0.021）。STR和OCR方法构建虚拟牙尖交错位咬合的能力优于BBR方法。
