Statement of problem

Programming semiadjustable and fully adjustable articulators involves time-consuming clinical steps which can be avoided if an accurate radiographic method can accurately determine the condylar guidance angles.

Purpose

The purpose of this clinical study was to compare the sagittal condylar guidance in dentate individuals as determined by a clinical method, protrusive interocclusal record, and a radiographic method, cone beam computed tomography. If the methods show a correlation, then cone beam computed tomography can be used as a time-saving method of programming an articulator for patients requiring a cone beam computed tomography scan.

Material and methods

A total of 40 participants (20 men and 20 women) within the 20 to 40 years age group were enrolled according to the inclusion and exclusion criteria. Cone beam computed tomography scans were obtained, and by using an appropriate software program, the sagittal condylar guidance was measured for both sides. A protrusive interocclusal record was obtained by using polyvinyl siloxane material. The maxillary cast of each participant was mounted on a semiadjustable articulator with a facebow transfer, and the mandibular cast was mounted with a maximum intercuspal record. The protrusive record was then transferred to the articulator for programming.

Results

The right and left sagittal condylar guidance values obtained from both the protrusive interocclusal record and cone beam computed tomography method were comparable, with no significant differences (P>.05). The difference in condylar inclination values for both sexes obtained from both methods for both sides were not statistically different (P>.05). With increasing age, condylar inclination values obtained from both methods tended to decrease. The values for sagittal condylar guidance obtained from both methods (protrusive interocclusal record and cone beam computed tomography) were comparable and correlated.

Conclusions

Cone beam computed tomography measurement involves stable bony landmarks and can be standardized, whereas clinical methods are time consuming and can provide inaccurate results because of the instability of the materials used to register the maxillomandibular relationship. Thus, cone beam computed tomography can be used to obtain the sagittal horizontal guidance for programming semiadjustable and fully adjustable articulators for patients requiring a cone beam computed tomography scan.

中文翻译：

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通过临床方法和锥束计算机断层扫描对齿状个体进行的矢状con突引导的比较评估

问题陈述

对半可调和完全可调的咬合架进行编程涉及耗时的临床步骤，如果精确的射线照相方法可以准确地确定the突的引导角度，则可以避免这些步骤。

目的

这项临床研究的目的是比较通过临床方法，突出性咬合间记录和放射线照相方法（锥束计算机断层扫描）确定的齿状体的矢状con突引导。如果这些方法显示出相关性，则锥束计算机断层扫描可以用作为需要锥束计算机断层扫描的患者对咬合架进行编程的省时方法。

材料与方法

根据纳入和排除标准，总共招募了20至40岁年龄段的40名参与者（20名男性和20名女性）。获得了锥形束计算机断层扫描，并通过使用适当的软件程序，测量了两侧的矢状con突引导。通过使用聚乙烯基硅氧烷材料获得了明显的咬合记录。将每个参与者的上颌石膏安装在带有a弓转移的半可调咬合架上，并将下颌石膏安装在最大的cus骨间记录上。然后将突出的记录转移到发音器进行编程。

结果

从突出的咬合间记录和锥形束计算机断层扫描方法获得的左右矢状con突指导值是可比较的，没有显着差异（P > .05）。通过两种方法获得的两性con突倾角值的差异在统计学上均无统计学差异（P > .05）。随着年龄的增长，从两种方法获得的con突倾角值趋于降低。从这两种方法（突入性咬合间记录和锥形束计算机断层扫描）获得的矢状con突引导的值是可比较的并且相关。

结论

锥形束计算机断层扫描测量涉及稳定的骨标志物，并且可以标准化，而临床方法耗时且由于用于记录上下颌关系的材料的不稳定性而可能提供不准确的结果。因此，对于需要锥束计算机断层摄影扫描的患者，锥束计算机断层摄影术可用于获得矢状水平引导，以对半可调和完全可调的咬合架进行编程。