Title: "Comparative assessment of the color stability and surface roughness of implant-supported provisional restorations fabricated by conventional technique, milling, and 3D printing: A randomized controlled clinical trial" Rationale: The study needs to verify the color stability and surface roughness of implant-supported provisional restorations fabricated using conventional technique, milling, and 3D printing.

Aim and objectives: To evaluate the color stability and surface roughness of implant-supported provisional prosthesis fabricated using conventional technique, milling, and 3D printing in the mandibular posterior region.

Setting: Department of Prosthodontics and Crown & Bridge, PGIDS, Rohtak. Study Design: Randomized controlled clinical trial. Population/Participants: Provisional restoration will be fabricated using conventional technique, milling and 3D printing.

Sample Size: Total of 36 samples will be prepared (n = 12 samples per test group).

Methodology: This is an in-vivo study and will be carried out in the Department of Prosthodontics and Crown & Bridge, Post Graduate Institute of Dental Sciences, Rohtak with the purpose to evaluate the color stability and surface roughness of implant-supported provisional restorations fabricated using conventional technique, milling, and 3D printing in the mandibular posterior region.

Outcome Measures: Measuring the color stability using spectrophotometer and surface roughness using profilometer.

Statistical Analysis: Data obtained will be compiled on MS Office Excel Sheet (v 2010) and will be subjected to statistical analysis using statistical package for social sciences (SPSS v 21.0, IBM). Intergroup and intragroup comparisons will be done according to the distribution of data.