Praveena Kanagesan, Ajay Ranganathan, Devaki Veeramalai, Balu Kandasamy, Preethisuganya Selvakumar, Menaga Venkatachalam
Department of Prosthodontics and Crown and Bridge, JKK Nattraja Dental College and Hospital, Komarapalayam, India.
Department of Prosthodontics and Crown and Bridge, Vivekanandha Dental College for Women, Elayampalayam, Tiruchengode, Namakkal, Tamil Nadu, India.
J Pharm Bioallied Sci. 2021 Jun;13(Suppl 1):S537-S541. doi: 10.4103/jpbs.JPBS_640_20. Epub 2021 Jun 5.
Various clinical methods for recording the condylar guidance (CG) are the intraoral check bite method, graphic tracings, and functional recordings. Accuracy of graphic tracings is affected by patient-related factors such as neuromuscular control of the individual, stability of record bases as well as stability of recording media. The current recommended average settings using Hanau's formula questionable, and thus reassessment is needed.
The purpose of this study is to use radiographic technique to determine the lateral CG and compare these values with those obtained using Hanau's formula and to evaluate whether there are differences between the right and left paths of the condyles.
Twenty completely edentulous patients were selected. Articulator was modified with sectioned protractor for obtaining per degree interval calibration. With the protrusive records, the horizontal CG (H) was adjusted and the Bennett's angle (LCG-C) was calculated using the formula. With the tracing device in the mouth, sub-mento vertex projection radiographs were obtained. Each radiograph was traced and superimposed for Bennett angle determination (LCG-M).
The median (interquartile range [IQR]) of right and left LCG-C were 15.45 (0.8) and 15.50 (0.7), respectively. The median (IQR) of right and left LCG-M were 37.00 (6.0) and 36.50 (6.8), respectively. A statistically significant difference exists between LCG-C and LCG-M. Both LCG-C and-M values exhibited no variations on both sides.
Radiographic technique yielded an amplified LCG when compared to the value obtained by Hanau's formula.
记录髁突引导（CG）的各种临床方法包括口内咬合检查法、图形描记法和功能记录法。图形描记的准确性受患者相关因素影响，如个体的神经肌肉控制、记录基托的稳定性以及记录介质的稳定性。目前使用哈瑙公式推荐的平均设置值得怀疑，因此需要重新评估。
本研究的目的是使用放射照相技术确定侧向CG，并将这些值与使用哈瑙公式获得的值进行比较，并评估髁突左右路径之间是否存在差异。
选择20例全口无牙患者。用分段量角器对牙合架进行改良，以获得每度间隔校准。通过前伸记录，调整水平CG（H），并使用公式计算贝内特角（LCG-C）。将描记装置放入口中，获得颏下顶点投影X线片。对每张X线片进行描记并叠加，以确定贝内特角（LCG-M）。
右侧和左侧LCG-C的中位数（四分位间距[IQR]）分别为15.45（0.8）和15.50（0.7）。右侧和左侧LCG-M的中位数（IQR）分别为37.00（6.0）和36.50（6.8）。LCG-C和LCG-M之间存在统计学显著差异。LCG-C和-M值在两侧均无变化。
与通过哈瑙公式获得的值相比，放射照相技术产生了放大的LCG。
