Effect of different home-bleaching techniques for a regular or an extended time on enamel properties.

Context: The side effects of bleaching products are still incompletely known.

Aims: This work aims to evaluate the effects of bleaching regimens on colour variation, microstructure, roughness, composition and nanohardness of human dental enamel until 8 weeks.

Settings And Design: : Twenty teeth were cross-sectioned to obtain eighty enamel fragments (50 × 50 mm) divided into four groups: CN (control Negative-artificial saliva), CP10 (10% carbamide peroxide), HP10 (10% hydrogen peroxide), and WS (whitening strips-10% hydrogen peroxide).

Corn starch films as a long-term drug delivery system for chlorhexidine gluconate.

The present study describes the development of a chlorhexidine long-term drug delivery system using starch as a biodegradable polymer base. Three batches of thermoplastic starch films, containing starch particles/nanoparticles and chlorhexidine (CHX), were manufactured by casting. Morphological characterization showed an irregular surface with particles incorporated with chlorhexidine agglomerated in a starch matrix.