Olthoff L, Meijer I, de Ruiter W, Bosman F, van der Zel J
Department of Oral-Maxillofacial Surgery, Prosthodontics and Special Dental Care, University Medical Center Utrecht, Utrecht, The Netherlands.
Int J Comput Dent. 2007 Apr;10(2):171-85.
Determinants of mandibular movements, like condylar inclination and incisal guidance, should be considered in the fabrication of restorations in occlusion to prevent posterior excursive occlusal interferences. The aim of this study was to investigate differences in the occlusal morphology of the right mandibular molar resulting from high, average, and low values of settings for determinants of anteroposterior and transverse mandibular movement using a virtual articulation model.
The articulation functionalities of computer integrated restorative technology by imaging and new acquisition (CYRTINA, Oratio B.V., Zwaag, The Netherlands) were used as a tool to examine the potential effect of determinants of mandibular movement on occlusal molar design. High, average, and low values for condylar guide inclination, incisal guide angle, and intercuspal contact area (antero-posterior determinants) and laterotrusion, mandibular lateral translation and intercuspal contact area (transverse determinants) were introduced and differences in molar morphology studied. The latter was done by comparing mesiodistal and buccolingual sections of the occlusal designs. These interocclusal differences were quantified as differences in frequency of occlusal distance intervals in an interocclusal range of 1 mm, measured from the occlusal surface of the molar model. The vertical distance with which a standard crown in occlusion had to be corrected to avoid interferences was calculated.
Among all parameters, the ipsilateral and contralateral mandibular lateral translation, sagittal condylar guide inclination, the ipsilateral laterotrusion and the incisal guide angle give substantial occlusal surface corrections. The high setting for the ipsilateral mandibular lateral translation required most correction.
High and low setting values of mandibular movement determinants require considerable adaptation of the occlusal surface of a crown to prevent occlusal disturbances.
在制作咬合修复体时，应考虑下颌运动的决定因素，如髁突倾斜度和切导，以防止后牙运动时的咬合干扰。本研究的目的是使用虚拟关节模型，研究前后向和横向下颌运动决定因素的高、中、低值设置对右侧下颌磨牙咬合形态的影响。
采用计算机集成修复技术的关节功能成像和新采集方法（CYRTINA，荷兰兹瓦格奥拉蒂奥有限公司）作为工具，研究下颌运动决定因素对磨牙咬合设计的潜在影响。引入髁导倾斜度、切导角和牙尖间接触面积（前后向决定因素）以及侧方运动、下颌侧方平移和牙尖间接触面积（横向决定因素）的高、中、低值，并研究磨牙形态的差异。通过比较咬合设计的近远中截面和颊舌截面来完成。这些咬合差异被量化为从磨牙模型咬合面测量的1mm咬合距离间隔频率的差异。计算了咬合时标准牙冠为避免干扰而必须校正的垂直距离。
在所有参数中，同侧和对侧下颌侧方平移、矢状髁导倾斜度、同侧侧方运动和切导角对咬合面有显著校正。同侧下颌侧方平移的高设置需要最多的校正。
下颌运动决定因素的高值和低值设置需要对牙冠的咬合面进行相当大的调整，以防止咬合紊乱。
