淺談牙齒美白

Tooth discoloration varies in etiology. It can be defined as being extrinsic or in-trinsic factors on the basis of localization and etiology. Extrinsic color changes may occur due to poor oral hygiene,ingestion of chromatogenic food and drinks, and to-bacco use. Intrinsic color changes may be caused by tetracycline medication, excessive fluoride ingestion, systemic or genetic diseases, dental caries,restorations, aging, and dental pulp problems. Extrinsic stains are located on the surface of the tooth and are most easily removed by external cleaning. Intrinsic stains are located within the tooth and are accessible only by bleaching. The theory of bleaching is that the free radicals attack organic molecules to achieve stability. The simpler molecules formed reflect less light so the tooth appears lighter in shade. The most commonly used drugs in clinical practice include hydrogen peroxide,carbamide peroxide, and sodium perborate. Depending on the vital or nonvital tooth, and whether it should be manipulated by doctors in dental clinic, we can divided the methods into nonvital bleaching, power bleaching and home bleaching. These bleaching effect, color stability, indications and contraindications are also different. Tooth bleaching is safe if we operate appropriate procedures.
Postoperative sensitivity may occur and the loss of calcium and phosphorus on the enamel surface may cause microstructural changes, but those are short-lived and recoverable. Do a good pre-operative assessment, communicate well with patients, choose the best method to achieve the best results, reduce side effects to create a win-win outcome.