Yang Li-Yuan, Liu Guan-Yi, Zhao Ling, Gao Xu
Dept. of Prosthodontics, School and Hospital of Stomatology, Cheeloo College of Medicine, Shandong University & Shandong Key Laboratory of Oral Tissue Regeneration & Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration, Jinan 250012, China.
Hua Xi Kou Qiang Yi Xue Za Zhi. 2020 Aug 1;38(4):404-409. doi: 10.7518/hxkq.2020.04.009.
To observe the changes of forward displacement of maxillary complete denture during centric occlusion, three different methods were used to record the changes of vertical overlap and the comfort level of patients before and after the selective grinding of the three dentures made according to maxillo-mandibular horizontal relationship record.
Twelve edentulous patients with normal stomatognathic system were recruited in this study. Three types of complete dentures for these 12 edentulous patients were made according to their different maxilla-mandibular horizontal relationship record methods. The amount of displacement of the maxillary complete denture, the vertical overlap of the anterior teeth as well as patient comfort level were recorded before and after selective grinding. Statistical analysis was performed using the SPSS 17.0 software package.
Before selective grinding, the amount of displacement of denture A was significantly larger than those of dentures B and C (P<0.05). After selective grinding, there was no statistical difference among the three dentures (P>0.05). During selective grinding, the vertical overlap variation of denture A was significantly greater than those of dentures B and C (P<0.05). Before selective grinding, the comfort level of the denture A was the lowest (P<0.05), and no statistical difference was found between dentures B and C (P>0.05). After selective grinding, no statistical difference was found among the three dentures (P>0.05).
Among the complete dentures with anatomical teeth, the dentures whose horizontal relationship was recorded at 1 mm before the apex of the Gothic arch apex and with checkbite are more in line with clinical repair requirements. Complete dentures whose horizontal relationship was recorded at the apex of Gothic arch need to be adjusted with selective grinding to meet the clinical restoration requirements.
为观察上颌全口义齿在正中咬合时的前伸位移变化，采用三种不同方法记录根据上下颌水平关系记录制作的三种义齿在选磨前后垂直覆合的变化及患者的舒适度。
本研究招募了12例口腔颌面部系统正常的无牙颌患者。根据这12例无牙颌患者不同的上下颌水平关系记录方法制作三种类型的全口义齿。记录选磨前后上颌全口义齿的位移量、前牙的垂直覆合情况以及患者的舒适度。使用SPSS 17.0软件包进行统计分析。
选磨前，义齿A的位移量显著大于义齿B和C（P<0.05）。选磨后，三种义齿之间无统计学差异（P>0.05）。选磨过程中，义齿A的垂直覆合变化显著大于义齿B和C（P<0.05）。选磨前，义齿A的舒适度最低（P<0.05），义齿B和C之间无统计学差异（P>0.05）。选磨后，三种义齿之间无统计学差异（P>0.05）。
在解剖式牙全口义齿中，水平关系记录在哥特式弓顶点前1mm并伴有咬合记录的义齿更符合临床修复要求。水平关系记录在哥特式弓顶点的全口义齿需要通过选磨进行调整以满足临床修复要求。
