Relationship between Ala-tragus Line and Occlusal Plane

doi:10.13701/j.cnki.kqyxyj.2020.09.009

Abstract

Abstract: Objective: To compare the relationship of the occlusal plane and different Ala-tragal lines. Methods: 125 students (36 males and 89 females) with complete natural dentition and class I occlusal relationship were selected to place the plane gage in their mouths. After taking lateral photos with digital camera, the included angles between the occlusal plane and middle point of ala-upper point of tragus (A1-T1), middle point of ala-middle point of tragus (A1-T2), middle point of ala-lower point of tragus (A1-T3), lower point of ala-upper point of tragus (A2-T1), lower point of ala-middle point of tragus (A2-T2), lower point of ala-lower point of tragus (A2-T3) were measured. Results: There was no parallel between the occlusal plane and six kinds of Ala-tragus lines. There was a statistical difference between the two angles and 0° (P<0.001), but the intersection angle between A1-T2 and the occlusal plane was the smallest (2.80°), and there was no statistical difference between A1-T1, A1-T2, A2-T3, and the occlusal plane (P>0.05). Conclusion: The middle point of the ala-the middle point of the tragus, the middle point of the ala-the upper point of the tragus, and the lower point of the ala-the lower point of the tragus can be used as the marker line of the plane of location.

Key words: Ala-tragus line, complete denture, occlusal plane

YANG Jiadi, LI Ning, BIAN Ce, WANG Xu. Relationship between Ala-tragus Line and Occlusal Plane[J]. Journal of Oral Science Research, 2020, 36(9): 835-838.

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