Boyarsky H P, Loos L G, Leknius C
University of the Pacific School of Dentistry, San Francisco, CA 94115, USA.
J Prosthet Dent. 1999 Nov;82(5):591-4. doi: 10.1016/s0022-3913(99)70059-4.
An inordinate amount of time is often required to adjust the occlusion of a newly fabricated crown.
This study determined whether the procedure of "cast adjustment" significantly decreases the time necessary to clinically adjust the occlusion of a newly fabricated crown.
Thirty-eight crowns were fabricated by a commercial dental laboratory for patients of senior dental students at the University of the Pacific School of Dentistry. After master casts were returned from the laboratory and then mounted on semiadjustable articulators by the students, the cases were divided randomly into 2 groups: (1) the control group, for which no further work was performed before fabrication of the restoration; and (2) the experimental group, in which casts were occlusally adjusted by a certified laboratory technician until there was at least 1 cusp tip to flat surface centric contact on each posterior tooth in maximum intercuspation position. After the crowns were delivered, the students filled out a survey. One question on the survey asked the student for the time required to adjust the occlusion on the crown.
Of the 19 crowns in the control group, 6 crowns required more than 1 hour for occlusal adjustment. Of the 19 crowns in the experimental group, 1 crown required more than 1 hour for occlusal adjustment.
Performing a "cast adjustment" before fabricating a single unit casting can significantly decrease the chance of a lengthy clinical occlusal adjustment.
通常需要花费大量时间来调整新制作牙冠的咬合。
本研究确定“铸型调整”程序是否能显著减少临床上调整新制作牙冠咬合所需的时间。
一家商业牙科实验室为太平洋大学牙科学院高年级牙科学生的患者制作了38个牙冠。在学生们将主模型从实验室取回并安装在半可调式牙合架上后，将病例随机分为两组：（1）对照组，在制作修复体之前不进行进一步操作；（2）实验组，由一名经过认证的实验室技术人员对模型进行咬合调整，直到在最大牙尖交错位时每颗后牙至少有一个牙尖顶与平面有正中接触。牙冠交付后，学生们填写了一份调查问卷。调查问卷上的一个问题询问学生调整牙冠咬合所需的时间。
对照组的19个牙冠中，有6个牙冠的咬合调整需要超过1小时。实验组的19个牙冠中，有1个牙冠的咬合调整需要超过1小时。
在制作单单位铸造体之前进行“铸型调整"可显著降低临床咬合调整时间过长的可能性。
