ข้อมูลบทความ
ปี 2019 ปีที่ 69 ฉบับที่ 1 หน้า 53-59
Title:
Effect of Bleaching Methods on Resin Impregnated Tooth
Keyword(s):
Color, Resin impregnated tooth, Tooth bleaching
Abstract:
The purpose of this research was to investigate the effect of bleaching methods on teeth that have a
resin impregnated layer. Half of the buccal of 40 extracted maxillary premolars were luted with orthodontic resin
cement and smooth polished with a tungsten carbide bur. The other half was used as a control group. The initial
color difference between both halves was unnoticed (ΔE<3). Teeth were divided into the following four groups: 1)
bleached with 10 % carbamide peroxide for 8 hours per day; 2) bleached with 20 % carbamide peroxide for 8 hours
per day; 3) in-office-bleaching with 40 % hydrogen peroxide every 6 days, and 4) in-office-bleaching with 40 %
hydrogen peroxide (1 day) followed by 10 % carbamide peroxide for 8 hours per day. The difference of color (ΔE)
between the cemented site and the controlled site was evaluated every three days using VITA Easyshade®V. The
bleaching procedures were continued until the ΔE less than 3. On day 3 of bleaching, the difference of color
between resin impregnated area and controlled area obviously increased in all the groups (ΔE>3). Group 3 showed
the highest color contrast followed by groups 2, 4 and 1 respectively. At day 6, the only increase in contrast was
with group 1 while the other group decreased. The unnoticeable color difference (ΔE<3) of group 3 was at day 6,
of group 4 and 2 were at day 9 and of group 1 was at day 15. All bleaching methods created color-mismatch. A
high concentration of bleaching gel caused a high contrast. However, it could reduce the contrast faster.