Effects of finishing/polishing techniques on microleakage of resin-modified glass ilonomer cement restorations.
This study investigated the effect of finishing/polishing techniques on the microleakage of resin-modified glass ionomer restorations. Class V preparations were made on the buccal and lingual/palatal surfaces of freshly extracted teeth. The cavities on each tooth were restored with Fuji II LC (FT [GC]) and Photac-Fil Quick (PF [3M-ESPE]) according to manufacturers' instructions. Immediately after light-polymerization, gross finishing was done with eight-fluted tungsten carbide burs. The teeth were then randomly divided into four groups and finishing/polishing was done with one of the following systems: (a) Robot Carbides (RC); (b) Super-Snap system (SS); (c) OneGloss (OG) and (d) CompoSite Polishers (CS). The sample size for each material-finishing/polishing system combination was eight. After finishing/polishing, the teeth were stored in distilled water at 37 degrees C for one week. The root apices were then sealed with acrylic and two coats of varnish was applied 1 mm beyond the restoration margins. The teeth were subsequently subjected to dye penetration testing (0.5% basic fuchsin), sectioned and scored. Data was analyzed using Kruskal-Wallis and Mann-Whitney U tests at a significance level of 0.05. Results of statistical analysis were as follows: Enamel margins: PF-OG<SS; FT-OG<RC; Dentin margins: PF-no significant difference; FT-OG & CS<RC. Regardless of the finishing/polishing technique, leakage at dentin margins was significantly greater than at enamel margins for FT. For PF, no significant difference in leakage scores was observed between dentin and enamel with the exception of finishing/polishing with OG. FT restorations had significantly less enamel and dentin leakage than PF restorations when treated with OG. The effect of finishing/polishing techniques on microleakage was both tissue and material dependent.
Yap
Adrian U J
AU
Department of Restorative Dentistry, Faculty of Dentistry, National University of Singapore, Republic of Singapore. rsdyapuj@nus.edu.sg
Yap
W Y
WY
Yeo
Egwin J C
EJ
Tan
Jane W S
JW
Ong
Debbie S B
DS
D000180:Acrylic Resins / Q000737:chemistry; D001840:Dental Bonding; D003737:Dental Cavity Preparation / Q000145:classification; D003743:Dental Enamel / Q000648:ultrastructure; D003763:Dental Leakage / Q000145:classification*; D003775:Dental Polishing / Q000295:instrumentation / Q000379:methods*; D003793:Dental Restoration, Permanent / Q000145:classification; D003804:Dentin / Q000648:ultrastructure; D005899:Glass Ionomer Cements / Q000737:chemistry*; D006801:Humans; D008027:Light; D011108:Polymers / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry*; D012117:Resins, Synthetic / Q000737:chemistry; D012394:Rosaniline Dyes; D018709:Statistics, Nonparametric; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors; D019227:Tooth Apex / Q000648:ultrastructure; D017973:Tungsten Compounds / Q000737:chemistry; D014867:Water / Q000737:chemistry
D000180:Acrylic Resins; C079765:Fuji II LC cement; D005899:Glass Ionomer Cements; C467912:Photac-Fil Quick; D011108:Polymers; D019279:Resin Cements; D012117:Resins, Synthetic; D012394:Rosaniline Dyes; D017973:Tungsten Compounds; D014867:Water; C002802:tungsten carbide; C025485:basic fuchsin