The in vitro and in vivo reproducibility of a video-based digital imaging system for tooth colour measurement.

Objectives: To assess the robustness of a new custom built video-based digital imaging system (VDIS) for measuring tooth colour and whiteness under in vitro and in vivo conditions.

Methods: The VDIS imaging system was developed for tooth colour measurement and evaluated in vitro and in vivo. The in vitro validation used extracted human teeth (HT, n=14) stored in water and VITA Classical shade guide tabs (SG, n=16).

Instant tooth whitening from a silica toothpaste containing blue covarine.

Objective: To measure the instant whitening effect delivered immediately after brushing with a novel silica whitening toothpaste containing blue covarine.

Methods: A controlled, single blind, cross-over study was performed to compare the tooth colour measured in a group of subjects at baseline and immediately after brushing with a silica whitening toothpaste containing blue covarine versus a clear gel negative control toothpaste. Measurements of tooth colour were made using a mobile non-contact camera-based digital imaging system and expressed as CIELAB and WIO whiteness index.