The effect of home bleaching agents on the surface roughness of tooth-colored restoratives with time.
This study evaluated the effects of home bleaching agents on the surface roughness of composite restoratives. Two home bleaching gels (10% and 15% carbamide peroxide, Opalescence) and five different tooth-colored restorative materials from the same manufacturer (3M-ESPE) were selected. They included microfill (Filtek A110 [FO]), flowable (Filtek Flow [FF]), polyacid-acid modified (F2000 [FT]) and minifill (Z100 [ZO]; Filtek Z250 [ZT]) composites. Thirty-six specimens of each material were fabricated, randomly divided into three groups (n=12) and treated as follows: Group 1-Stored in distilled water, Group 2-Bleached with 10% carbamide peroxide (CP) eight hours/day; Group 3-Bleached with 15% CP eight hours/day. All treatment was conducted at 37 degrees C and fresh gel applied and rinsed off daily for eight weeks. For the bleached groups, the specimens were stored in distilled water at 37 degrees C during the hiatus periods. All the specimens were subjected to roughness testing (Ra) at weeks 0, 1, 2, 4, 6 and 8 using a profilometer. The results were analyzed using general linear model with Scheffe's post-hoc tests at significance level 0.05. The results showed that the effect of bleaching on surface roughness was material and time dependent. ZT was not affected by bleaching treatment, while FT was significantly roughened after one week of bleaching with 15% CP compared to the control group. FO, FF and ZO were not significantly roughened until eight weeks of bleaching. Repolishing or replacement of tooth-colored restorations may be required after bleaching procedures.
Department of Restorative, Faculty of Dentistry, National University of Singapore, Republic of Singapore. praneek@esloxinfo.com
Pranee
P
Wattanapayungkul
Adrian U J
AU
Yap
Kar Wei
KW
Chooi
Mei Fern Lynette Ann
MF
Lee
Ryan S
RS
Selamat
Ruiyi Dahlia
RD
Zhou
D000704:Analysis of Variance; D000077463:Carbamide Peroxide; D020770:Compomers; D003188:Composite Resins; D003793:Dental Restoration, Permanent; D004338:Drug Combinations; D005899:Glass Ionomer Cements; D016014:Linear Models; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D010545:Peroxides; D012822:Silicon Dioxide; D013499:Surface Properties; D013997:Time Factors; D014073:Tooth Bleaching; D014508:Urea / Q000031:analogs & derivatives*; D015040:Zirconium
D020770:Compomers; D003188:Composite Resins; D004338:Drug Combinations; C118368:F2000 cement; C452225:Filtek A110 composite resin; C467913:Filtek Flow; C444701:Filtek Z250; D005899:Glass Ionomer Cements; D010545:Peroxides; C083568:Z100 composite resin; D000077463:Carbamide Peroxide; D012822:Silicon Dioxide; D014508:Urea; D015040:Zirconium