|2115 Bleaching Effect to Desensitized human Enamel|
M. HOSHINO1, K. NISHIMURA1, T. TOKO1, H. HISAMITSU1, H. TANAKA2, A. KANEMATSU2, and T. YAMAMOTO2, 1Showa University, Tokyo, Japan, 2SunMedical Co., Ltd, Shiga, Japan|
Objective: Tooth sensitivity is the most common side-effect of tooth whitening. There are many materials and techniques for reducing sensitivity. For reducing sensitivity, we tried to use Parkell Pain-Free Desensitizer. (The original product is MS-Coat, made in Japan by SUN MEDICAL.) The purpose of this study was to examine the desensitizing effect and possibility of bleaching effect inhibition. Materials and Methods: Pain-Free is a tri-polymer chemical and bonded to the walls of tubules or microcracks. It locked out external stimuli. We tested the desensitizing effect of Pain-Free by a split test—i.e., the maxillary right anterior was control, the left anterior was experimental (for the application of Pain-Free). To determine the desensitizing effect, we used blown air and also had patients ask the examiner. Eleven volunteer patients from Showa University dental hospital participated. Discus Nite White® Excel containing 10% carbamide peroxide tray bleach was used. Additionally, we measured extracted human tooth color and observed the morphology of enamel surface by SEM before and after bleach with/without Pain-Free. Results: The average dE values of the split test were: left anterior (with application of Pain-Free), 4.3 (Standard Deviation [SD] 1.7), and right anterior (control), 4.8 (SD 2.2), after 2 wks; and left, 4.8 (1.2), and right, 5.1 (0.8), after 4 wks. Cases of sensitivity were: left, 2, and right, 3, after 2 wks; and left, 0, and right, 1, after 4 wks. Laboratory tests revealed average dE values of extracted teeth were 7.5 (SD 1.3) with Pain-Free and 10.0 (2.0) without. There was a significant difference between with and without Pain-Free. Conclusions: By SEM observation, micro-winkled thin-film-like structure, partially detached, was recognized on bleached enamel. Pain-Free was effective for desensitizing during bleach, but the bleaching effect of Nite White® Excel was slightly inhibited.
|Seq #174 - Tooth Bleaching|
3:30 PM-4:30 PM, Friday, 30 June 2006 Brisbane Convention & Exhibition Centre Exhibit Hall 1