[논문]A determination of occlusal plane comparing different levels of the tragus to form ala-tragal line or Camper's line: A photographic study

Kumar, Sandeep; Garg, Sandeep; Gupta, Seema

doi:10.4047/jap.2013.5.1.9

A determination of occlusal plane comparing different levels of the tragus to form ala-tragal line or Camper's line: A photographic study 원문보기

The journal of advanced prosthodontics, v.5 no.1, 2013년, pp.9 - 15

Kumar, Sandeep (Department of Prosthodontics and Maxillofacial Prosthetics, Surendera Dental College & Research Institute) , Garg, Sandeep (Department of Prosthodontics and Maxillofacial Prosthetics, M M Institute of Dental Sciences) , Gupta, Seema (Department of Orthodontics, Surendera Dental College & Research Institute)

Abstract ▼ AI-Helper

PURPOSE. The purpose of this study was to determine accurately the part of the tragus to be used to form the Ala-Tragal line or Camper's line in orthognathic profile patients. MATERIALS AND METHODS. 150 dentate subjects with age of 18-40 years with orthognathic profile were sampled. Life-size lateral digital photographs of the face with fox plane were taken in natural head position. Different angles between Eye-Ear plane and occlusal plane ($OT_1$-OP), Eye-Ear plane and ala-superior border of tragus ($OT_1-AT_1$), Eye-Ear plane and ala-middle border of tragus ($OT_1-AT_2$) and Eye-Ear plane and ala-inferior border of tragus ($OT_1-AT_3$) were calculated using computer software package, AutoCAD 2004. From the three angles formed by the Eye-ear plane ($OT_1$ or FH plane) and the ala-tragal lines, the one closest to the angle formed between Eye-Ear plane ($OT_1$) and occlusal plane (OP) was used to determine the occlusal plane of orientation. The obtained results were subjected to ANOVA F test, Tukey's Honestly significant difference test, followed by Karl Pearson coefficient of correlation test. P values of less than 0.05 were taken as statistically significant. RESULTS. The mean of base line angle i.e. $OT_1$-OP angle ($11.96{\pm}4.36$) was found to be close to $OT_1-AT_2$ angle ($13.67{\pm}1.93$) and $OT_1-AT_3$ angle ($10.31{\pm}2.03$), but $OT_1$-OP angle was found to be more closer to $OT_1-AT_3$ angle. Comparison of mean angles showed that $OT_1$-OP angle in both males (11.68) and females (12.51) is close to $OT_1-AT_3$ angle (males- 11.01, females- 11.95). CONCLUSION. The line joining from ala to the lower border of the tragus was parallel to the occlusal plane in 53.3% of the subjects. There was no influence of the sex on the level of occlusal plane.

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문제 정의

This study is a photographic evaluation of the border of the tragus to be used to form Ala-tragal line in orthognathic dentate subjects. The photographic technique used in this study is non-invasive and simple and the entire technique was standardized.

가설 설정

10. A minimum of conservative treatment and that too not in incisors and molars.
6. Subjects had regular alignment of teeth without any supra-eruption or drifting i.e. well formed occlusion.

제안 방법

Different workers have used different methods to determine the occlusal plane and the Ala-Tragal line. In this study photography was used to determine the occlusal plane in dentulous patients with orthognathic profile. To fulfill the objective of this study and simplify the procedures, well-established landmarks, terminology and equipment have been used.
This study is a photographic evaluation of the border of the tragus to be used to form Ala-tragal line in orthognathic dentate subjects. The photographic technique used in this study is non-invasive and simple and the entire technique was standardized. The subject-to-camera distance (1.
Precise positioning of the subject, especially with no external device is very difficult, resulting in a situation in which the true anatomic mid-sagittal plane coincides with the nominal mid sagittal plane at the focusing plane only rarely and by chance. To minimize this error, in the study, a plumb line was suspended in front of the mirror that was used to bisect the facial refection and to minimize lateral head rotations. This also served to standardize the mid-sagittal plane to film distance.

대상 데이터

This study was conducted on subjects who were out patients and students of Manipal College of Dental Sciences, Manipal. A total of 150 Indian subjects within the age group of 18-40 years were selected for the study. Selection Criterias were as follows:
The points that have to be digitized on the photographs are clearly defined to minimize the intraexaminer location error. Photographs were taken with the subjects positioned in the natural head posture (NHP). NHP is a logical orientation adopted for assessing facial profile as it relates to the patient’s head posture in daily life.
The in-built zoom lens with an auto focus range to infinity ensured that the image were of high quality. The camera was placed on a standard adjustable tripod stand. The arms and adjustable plates of the tripod stand were set so that camera was parallel to the horizontal.
Also it is universally accepted as a fixed cranial plane.¹⁶ The subjects were selected between the age group of 18-40 years. By 18 years growth of the face ceases and there is no change in the relationship of camper’s plane to the occlusal plane.
This study was conducted on subjects who were out patients and students of Manipal College of Dental Sciences, Manipal. A total of 150 Indian subjects within the age group of 18-40 years were selected for the study.

데이터처리

Comparison among the groups was done by ANOVA (analysis of variance) Fisher ‘F’ test.
Inter comparison between the groups was done by Tukey’s Honestly significant difference test.
Inter comparison between the groups was done by Tukey’s Honestly significant difference test. The correlation between the groups was found out by using Karal Pearson coefficient of correlation test. P value was used to find out level of statistically significance where P<.

참고문헌 (25)

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A determination of occlusal plane comparing different levels of the tragus to form ala-tragal line or Camper's line: A photographic study 원문보기

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A determination of occlusal plane comparing different levels of the tragus to form ala-tragal line or Camper's line: A photographic study 원문보기

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