Technique for Darkening of Extracted Teeth Simulating Pulpal Necrosis Discoloration.

Background: The use of discolored teeth is required to test whitening products, and it is difficult to obtain them, given their scarcity.

Objective: To present a technique for in vitro darkening of extracted teeth simulating pulpal necrosis discoloration.

Materials And Methods: Hemolysates I and II from human blood were subjected or not to laser irradiation (442 nm) for 1 h.

Translucency parameter of conventional restorative glass-ionomer cements.

Objective: To evaluate the translucency parameter (TP) and contrast ratio (CR) of different conventional restorative glass-ionomer cements (GICs).

Materials And Methods: Eighteen brands of GICs were evaluated. Five disks of each material were made following ISO 9917-1.

Color stability over time of three resin-based restorative materials stored dry and in artificial saliva.

Objective: To evaluate the color match of different composite resins relative to Vitapan Classical shade guide tab and their respective manufacturers' shade guide tabs as a function of time and storage.

Materials And Methods: Three enamel shade A2 composite resins were used to fabricate 36 disk-shaped polymerized specimens (12 each), allocated into 2 groups of 6 and stored dry (GD) and in artificial saliva (GS). CIELAB coordinates from shade tabs and resin specimens immediately after polymerization (t0), and 24 hours (t1), 7 (t7), 14 (t14) and 21 (t21) days after polymerization were captured using a colorimeter.