Liu Y, Hu J R, Zhao Y J, Wang Y, Sun Y C, Pan S X, Feng H L
Department of Prosthodontics, Center for Digital Dentistry, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China.
Beijing Da Xue Xue Bao Yi Xue Ban. 2020 Apr 18;52(2):368-372. doi: 10.19723/j.issn.1671-167X.2020.02.027.
To measure the dimensional data of complete dentures and to design a novel tray for recording maxillomandibular relationship of edentulous patients.
For the measurement, 100 pairs of complete dentures from the clinic were surveyed for the following parameters: a1, the distance between the middle fossa of the upper left and right first molars; a2, the anterior-posterior distance between the middle fossa of the upper first molars and the incisal edge; a3, the width of the upper denture; a4, the anterior-posterior length of the upper denture; a5, the height from the mesio-lingual cusp of the right upper first molar to the saddle surface; a5, the height from the central fossa of the right lower first molar to the saddle surface; a6, the height from the notch of the upper lip frenulum to the upper central incisor edge; a7, the least thickness of the labial saddle base in the upper central incisor region. Based on the data, the trays with different sizes were designed and fabricated, and the key parameters were: b1, the distance between the foramina of screw posts, b2, the anterior-posterior distance between the foramina of the screw posts and the incisal edge; b3, the width of the tray; b4, the anterior-posterior length of the tray; b5, the height of the posterior platform with the screw nut; b5, the height of the screw post; b6, the height of the anterior tray handle; b7, the thickness of the anterior tray handle.
The minimum, average and maximum data for each parameter were (in millimeter): a1: 37.1, 44.5, and 59.6; a2: 22.6, 29.0, and 38.1; a3: 48.5, 58.2, and 76.6; a4: 37.4, 50.8, and 61.0; a51: 5.6, 9.5, and 14.7; a52: 3.8, 9.9, and 18.8; a6: 8.9, 16.6, and 24.7; a7: 1.2, 2.8, and 5.9. Based on the data, the trays in small, medium and large sizes were designed and fabricated. In clinical application, the putty silicone rubber impression material was used to reline the tray, meanwhile the posterior platform and anterior tray handle were set as the occlusal plane, then the screw posts were added and adjusted till the proper vertical dimension, after that, the putty silicone rubber impression material was added around the screw posts to record the horizontal maxillomandibular relationship, finally, the anterior surface of the tray handle was used to record the midline of the face and lower edge of the upper lip at rest and with smile.
The dimensional data offered reference for the analysis of restoration space in edentulous patients. The tray designed and fabricated in this study may serve as a new tool for recording the maxillomandibular relationship.
测量全口义齿的尺寸数据，并设计一种新型托盘，用于记录无牙颌患者的颌位关系。
为进行测量，对临床上100副全口义齿的以下参数进行了测量：a1，左上、右上第一磨牙中央窝之间的距离；a2，上第一磨牙中央窝与切缘之间的前后距离；a3，上半口义齿的宽度；a4，上半口义齿的前后长度；a5，右上第一磨牙近中舌尖至基托面的高度；a5，右下第一磨牙中央窝至基托面的高度；a6，上唇系带切迹至上中切牙切缘的高度；a7，上中切牙区唇侧基托的最小厚度。基于这些数据，设计并制作了不同尺寸的托盘，关键参数为：b1，螺柱孔之间的距离；b2，螺柱孔与切缘之间的前后距离；b3，托盘的宽度；b4，托盘的前后长度；b5，带螺母的后平台高度；b5，螺柱的高度；b6，前托盘柄的高度；b7，前托盘柄的厚度。
各参数的最小、平均和最大数据（单位：毫米）为：a1：37.1、44.5和59.6；a2：22.6、29.0和38.1；a3：48.5、58.2和76.6；a4：37.4、50.8和61.0；a51：5.6、9.5和14.7；a52：3.8、9.9和18.8；a6：8.9、16.6和24.7；a7：1.2、2.8和5.9。基于这些数据，设计并制作了小、中、大三种尺寸的托盘。在临床应用中，使用硅橡胶印模材料对托盘进行重衬，同时将后平台和前托盘柄设置为咬合平面，然后添加并调整螺柱直至达到合适的垂直距离，之后在螺柱周围添加硅橡胶印模材料以记录水平颌位关系，最后，使用托盘柄的前表面记录面部中线以及静止和微笑时上唇的下缘。
这些尺寸数据为无牙颌患者修复空间的分析提供了参考。本研究设计并制作的托盘可作为记录颌位关系的一种新工具。
