Goyal Mukesh Kumar, Goyal Shelly
Department of Prosthodontics and Maxillofacial Prosthetics, Jan Nayak Ch. Devilal Dental College, Sirsa, Haryana, India.
Indian J Dent Res. 2011 Nov-Dec;22(6):880. doi: 10.4103/0970-9290.94695.
The purpose of this study was comparative evaluation of sagittal condylar values of arcon and non-arcon articulators with cephalometric readings and to determine the amount of discrepancy in sagittal condylar guidance values between arcon and non-arcon articulators using same protrusive record.
Twenty subjects in the age group of 19-35 years, free from temporomandibular joint dysfunction, and occlusal disharmony, with healthy dentition participated in the study. Hanau H2 (non-arcon type) and Hanau Wide-Vue (arcon type) articulators were programmed for sagittal condylar guidance values using the same protrusive record made in polysiloxane bite registration material with edge to edge degree of protrusion. The resultant values for both the articulators on either side were compared with values obtained from tracing of digital lateral cephalogram using Kodak Dental imaging Window software 6.6.3.0-C program. The tabulated data were subjected to statistical analysis, ANOVA (Fishers 'F' test) for group comparison, Tukey's HSD test for inter-comparison, student's unpaired 't' test for intra-group comparison, and level of significance (P) was calculated using the same.
The mean sagittal condylar guidance values of the three different groups were found to be very highly significant (P=0.001) and highly significant (P=0.002) on the right and left sides respectively. There was a very highly significant difference (P=0.001) and highly significant difference (P=0.003) between the arcon and non-arcon group on the right and left side respectively. No significant difference was found between the arcon and cephalometric group (P=0.284 right, P=0.853 left) and a statistically significant difference was found between the non-arcon and cephalometric group (P=0.049 right, P=0.015 left). On intragroup comparison there was no statistically significant difference in sagittal condylar values on the right and left sides.
The mean difference in the sagittal condylar guidance values obtained from non-arcon and arcon articulators shows a low level of reproducibility, and no significant difference found in mean sagittal condylar values obtained from arcon articulator and cephalometric tracings indicates replication of sagittal condylar guidance value from image of articular eminence.
本研究的目的是将Arcon型和非Arcon型牙合架的髁突矢状位值与头影测量读数进行比较评估，并使用相同的前伸记录来确定Arcon型和非Arcon型牙合架在髁突矢状位引导值上的差异量。
20名年龄在19 - 35岁之间、无颞下颌关节功能障碍和咬合不协调且牙列健康的受试者参与了本研究。使用在聚硅氧烷咬合记录材料中制作的具有边缘对边缘前伸程度的相同前伸记录，对Hanau H2（非Arcon型）和Hanau Wide-Vue（Arcon型）牙合架进行髁突矢状位引导值编程。将两侧两种牙合架的结果值与使用柯达牙科成像窗口软件6.6.3.0 - C程序从数字化侧位头影图追踪获得的值进行比较。将列表数据进行统计分析，采用方差分析（费舍尔F检验）进行组间比较，采用图基HSD检验进行组间相互比较，采用学生未配对t检验进行组内比较，并使用相同方法计算显著性水平（P）。
三个不同组的平均髁突矢状位引导值在右侧和左侧分别被发现具有非常高度显著性（P = 0.001）和高度显著性（P = 0.002）。Arcon型和非Arcon型组在右侧和左侧分别存在非常高度显著性差异（P = 0.001）和高度显著性差异（P = 0.003）。在Arcon型和头影测量组之间未发现显著差异（右侧P = 0.284，左侧P = 0.853），而在非Arcon型和头影测量组之间发现了统计学显著性差异（右侧P = 0.049，左侧P = 0.015）。在组内比较中，右侧和左侧的髁突矢状位值没有统计学显著性差异。
从非Arcon型和Arcon型牙合架获得的髁突矢状位引导值的平均差异显示出低水平的可重复性，并且从Arcon型牙合架和头影测量追踪获得的平均髁突矢状位值未发现显著差异，这表明关节结节图像的髁突矢状位引导值具有重复性。
