A comparative Evaluation of the Translucencies of Three Commercially Available Brands Of Translucent Zirconia Ceramic Systems with a Conventional Lithium Disilicate Ceramic System – An In-Vitro Study

S18 The Journal of Indian Prosthodontic Society | Volume 20 | Supplement 1 | December 2020 Introduction: Smile zone mainly encompasses the teeth and gingiva. Aim of this paper is to determine visibility of maxillary teeth in males and females at superior and lateral lip mobility in a specific shape of smile zone. Methodology: 384 subjects of 18 to 40 years were selected. An image of each subject’s face was captured in resting and spontaneous smiling state under standardized condition. Smile zone shape, Lip mobility superiorly and laterally, number of maxillary teeth visibility, amount of maxillary anterior teeth visibility and the relationship of all these parameters in males and females were analyzed. Unpairedstudent t test, one-way ANOVA, Post-hoc, and Pearson chisquare tests were used for analysis. Result: More common smile zone shape was bow. 201 subjects were having the superior lip mobility in the range of 1-5mm and exposure of the right and left central incisors was 71.09 % and 71.23 %, Right and left lateral incisors was 79.33% and 79.77%, right and left canines was 67.18% and 73.91%. Ellipse smile zone was having maximum amount of exposure. Females were having maximum exposure of teeth. More common range of lateral lip mobility was 11-15 mm and maximum numbers of teeth were visible in straight smile zone shape. Conclusion: More common smile zone shape was bow. Superior and lateral lip mobility was 2-15mm and 4-30mm. Maximum amount of teeth exposure was seen in ellipse smile zone shape. More numbers of teeth were exposed in straight smile zone shape. Females were having maximum exposure both in lateral and superior lip mobility. DOI: 10.4103/0972-4052.306343 A study to evaluate the effectiveness of three different treatment modalities for management of temporo-mandibular joint disorders