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ORIGINAL RESEARCH
Year : 2012  |  Volume : 2  |  Issue : 4  |  Page : 545-550

Reliability of lower lip line as a guide in determining occlusal plane in complete denture fabrication-A cephalometric study of dentate subject


1 Professor, Department of Prosthodontics, Rajah Muthaiah Dental college, Annamalai university, Chidambaram, India
2 Lecturer, Department of Prosthodontics, Rajah Muthaiah Dental college, Annamalai university, Chidambaram, India
3 Senior Lecturer, Department of Prosthodontics, Sree Balaji Dental College and Hospital, Chennai, India
4 Senior Lecturer, Department of Prosthodontics, KSR Dental College, Thiruchengode, India

Correspondence Address:
Dr. P S Manoharan
Professor, Department of Prosthodontics, Rajah Muthaiah Dental college, Annamalai university, Chidambaram
India
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Source of Support: None, Conflict of Interest: None


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Purpose of the study: The purpose of the study was to emphasise on the reliability of using "lower lip line on smile" as a guide to determine the cant of the occlusal plane by evaluating the relative parallelism of the occlusal plane to the lower lip line [LPL] and other traditionally used landmark such as ala tragus line in dentulous patients. Material and methods: The study comprises of 50 dentulous individuals, the markings were done on the supe- rior border of the lower lip[LPL], ala of the nose and three points on the tragus of the ear on superior, middle and inferior [ATS, ATM and ATI]. The cephalograms were traced and digital evaluation was made to calculate the angle between the occlusal plane [OP] and the above mentioned planes - OP-LPL, OP-ATS, OP-ATM, and OP-ATI using a screen protractor. The obtained data were statistically analyzed. Results: The data was analysed with student 't' test and 'one way ANOVA' analysis. The angle between OP-LPL was minimal with a mean value of about 11.50 degrees and standard deviation of about 6.59 degrees. Conclusion: LPL on smile can be used as a reliable landmark to determine the cant of the anterior or posterior occlusal plane during complete denture construction.


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