Abstract
Background: Determining occlusal plane is challenging and difficult aspect during complete removable partial denture prosthesis rehabilitation. Numerous soft tissue landmarks like commissures of the mouth by Gillis in 1933, parotid papilla by P. F. Foley and G. H. Latta in 1985, height of the retromolar pad, the lateral borders of the tongue etc. had been proposed to assist clinician for determining the occlusal plane. No universally accepted reliable anatomical measurement has been proposed to assist in determining of occlusion plane for different ethnic groups in context to Nepal.
 Material & Methods: This cross-sectional study was conducted in the 60 dentate subjects visiting Nobel Medical College, Nepal, from February 2019 to July 2019. A customized occlusal plane relator was used to evaluate relative parallelism between occlusal plane and alatragal line with respect to different borders of tragus. All the data were collected and statistically analyzed.
 Results: Maxillary occlusal plane was found to be parallel with the line drawn from ala of the nose to the middle of tragus in 66.66%, followed by inferior border of tragus in 18.33% with the least parallelism in superior border of tragus 15%. Relationship of maxillary occlusal plane with alatragal line was not statistically significant among Aryans and Mongolian ethnicity
 Conclusion: This study showed line joining ala of the nose and middle border of tragus is parallel to maxillary occlusal plane. And no difference was found for Aryan & Mongolian ethnicity in relation to alatragal line and maxillary occlusal plane.
Highlights
According to Glossary of Prosthodontic Terms, Occlusal plane is de ned as “the average plane established by the incisal and occlusal surfaces of the teeth”
No difference was found for Aryan & Mongolian ethnicity in relation to alatragal line and maxillary occlusal plane
The parallelism between the maxillary occlusal plane with ala-tragus line was determined by the difference between the anterior and the posterior measurement
Summary
According to Glossary of Prosthodontic Terms, Occlusal plane is de ned as “the average plane established by the incisal and occlusal surfaces of the teeth”. Boucher de ned Camper's line as an imaginary line that runs from the superior border of the tragus of the ear to the inferior border of the ala of the nose These variations by different author necessitate the de nite point on tragus to be located by recording ala tragus line. Apart from these landmarks, the in uences of other factors like age, sex, ethnicity to the position of the occlusal plane is questionable.
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