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VOLUME 11 , ISSUE 1 ( January-February, 2020 ) > List of Articles

ORIGINAL RESEARCH

Investigation into the Effect of Mold Temperature on the Fatigue Deflection of Clasps of Commercially Pure Titanium: An In Vitro Study

Aashritha Shenava, Roselene Meshramkar

Keywords : Casting technique, Flexural strength, Mold temperature

Citation Information : Shenava A, Meshramkar R. Investigation into the Effect of Mold Temperature on the Fatigue Deflection of Clasps of Commercially Pure Titanium: An In Vitro Study. World J Dent 2020; 11 (1):69-74.

DOI: 10.5005/jp-journals-10015-1691

License: CC BY-NC 4.0

Published Online: 25-12-2012

Copyright Statement:  Copyright © 2020; The Author(s).


Abstract

Aim: The aim of the study was to evaluate the effect of mold temperature [room temperature (32°C), 450°C, and 790°C] on the fatigue deflection of clasps of commercially pure titanium. Materials and methods: Forty-five retentive wax profiles were cast in molds having three different mold temperature [room temperature (32°C), 450°C, and 790°C]. Specimens of grade 4 titanium, following the eligibility criteria, were selected. A 2-mm deflection test was done using an Instron machine and the flexibility of clasps of the respective groups was calculated. Deflection fatigue was tested using a cyclic-loaded custommade oscillating machine by calculating the number of loading cycles required to fracture the specimen. Results: The mean of flexibility of the clasp bars was observed and the difference was significant (between groups, F value was 38.49 at p = 0.0000 and within groups at p ≤ 0.01, respectively). The number of loading cycles applied to the clasp bars casted with 450°C and room temperature was more than that of 790°C, suggesting that the fatigue strength of clasps casted at 450°C and room temperature is more than that at 790°C. The mean of loading cycles of the clasp bars was observed and the difference was significant. Between groups, F value was 11.89 at p = 0.0001 and within groups at p ≤ 0.01. Conclusion: The number of loading cycles applied to the clasp bars casted with 450°C and room temperature was more than that of 790°C, and this suggests that the fatigue strength at 450°C and room temperature is more than that at 790°C. Temperature has an important role to play as the modulus of elasticity is higher at room temperature and 450°C than that at 790°C. Clinical implication: The ideal temperature for a titanium casting with relatively high fatigue strength would be 450°C mold temperature or room temperature. By investigating the fatigue deflection, it is clear that a desired undercut should be planned before clasp designing, considering the metal to be used.

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