Development of surface coating material for discolored tooth equipped with bleaching effect.

Area of Science:

• Dental Materials Science
• Biomaterials Engineering
• Cosmetic Dentistry

Background:

• Discolored teeth are a common aesthetic concern.
• Existing whitening treatments may have limitations in duration or application.
• Developing safe and effective whitening coating resins is desirable.

Purpose of the Study:

• To augment a coating resin with a bleaching agent for short- and long-term whitening.
• To evaluate the efficacy, mechanical properties, biocompatibility, and safety of the sodium percarbonate (SPC)-containing resin for dental application.

Main Methods:

• Incorporation of sodium percarbonate (SPC) into a base coating resin.
• Assessment of bleaching effectiveness on Maillard reaction-discolored bovine teeth.
• Evaluation of Vickers hardness and shear bonding strength.
• Biocompatibility testing using hamster cheek pouch mucosa.
• Hydrogen peroxide (H2O2) release and pulp penetration studies.

Main Results:

• SPC effectively bleached discolored bovine teeth.
• Vickers hardness was not reduced by SPC; hybrid material hardness increased.
• Shear bonding strength of SPC-containing resin was low.
• No mucosal inflammation observed with SPC resin protected by base resin.
• H2O2 penetration into the pulp chamber was undetectable when applied to teeth with a protective base resin layer.

Conclusions:

• SPC-augmented coating resin provides effective short- and long-term whitening.
• The material exhibits acceptable mechanical properties and enhanced hardness.
• The developed SPC resin is biocompatible and safe for use as a coating on discolored teeth, with no detectable pulp H2O2 penetration.