Evaluation of Colour Stability of the Dentures by Two Different Methods (Intrinsic and Extrinsic) of Characterisation using Mobile Phone Colourimeter Application: A Research Protocol

Introduction: The aesthetics of a dental prosthesis should blend with the surrounding soft tissues, particularly in the anterior region of the dentition. Advances in laboratory technology and dental materials have enabled us to produce aesthetically pleasing, customised dentures that closely resemble each patient’s intraoral features. Need for the study: Conventional denture fabrication lacks the natural appearance of healthy gingiva. When denture bases are fabricated with Polymethyl Methacrylate (PMMA) resin, aesthetics are restricted. Consequently, attempts have been made to fabricate cosmetic dentures tili using various intrinsic techniques (colour-matching resins) and more contemporary extrinsic techniques (gingival shade composite resin). Aim: The aim of this study is to use a colourimeter software application on a mobile phone to compare the colour stability of denture characterisation using two distinct methods (intrinsic and extrinsic). Materials and Methods: This experimental study will be conducted in the Department of Prosthodontics and Crown and Bridge at Sharad Pawar Dental College and Hospital, Sawangi (M), Wardha, Maharashtra, India, from July 2024 to January 2026. The study will involve two groups using two different characterisation methods: extrinsic (using gingival shade composite resin) and intrinsic (using colour blending resins). Colour stability will be assessed using a mobile phone colourimeter application based on Hue, Saturation, and Value (HSV), following pre- and poststaining with three solutions: tea, coffee, and turmeric solution. The normality of continuous outcome variables will be assessed initially at the 5% level of significance (p≤0.05) employing the Kolmogorov–Smirnov test. Significant differences between groups at the 5% level (p≤0.05) will be determined using an independent t-test.