Comparative Evaluation of Colour Stability and Surface Roughness of Provisional Crowns Fabricated Using Additive and Subtractive Manufacturing Technique after Immersion in 3 Oral Ageing Solutions – An Invitro Study

Abstract

Aim – To evaluate the colour stability and surface roughness of provisional crowns fabricated using additive and subtractive method after immersion artificial saliva, cola and saliva with reduced Ph.

Methodology- 48 provisional crowns were fabricated by additive manufacturing and subtractive manufacturing and divided into 3 subgroups and immersed in artificial saliva, cola and saliva with reduced Ph. Surface roughness and colour measurements were made before and after immersion. Anova test was done to analyze the data followed by Bonferonii post-hoc multiple comparison and t test to determine statistical significance.

Results- After 3 days and 7 days of immersion all samples showed increase in surface roughness with additive manufactured samples showing a significant change. The subtractive manufactured samples showed increased colour change when immersed in cola as opposed to the additive manufactured crowns which had greater colour variations when immersed in saliva with reduced Ph.

Conclusion - Additive manufactured crowns show lesser surface roughness and good colour stability when subject to varying oral environment and hence can be suitably used especially in long term provisionalization