title: Effect of bulk insertion, prepolymerized resin composite balls, and beta-quartz inserts on microleakage of Class V resin composite restorations.
abstract: Polymerization shrinkage of resin composite at the margin can seriously decrease the longevity of the restoration. Three direct restorative techniques were evaluated for their effects on microleakage. Sixty Class V cavities were prepared in extracted human maxillary molar teeth. The cavities were restored with resin composite placed in one bulk increment, resin composite and a beta-quartz insert, or resin composite and a prepolymerized resin composite ball insert. After they were thermocycled and placed in 0.5% basic fuchsin for 24 hours, the specimens were sectioned and examined for microleakage. The restorations with a prepolymerized ball of resin composite exhibited significantly more microleakage than did restorations with a beta-quartz insert or restorations inserted in bulk.
authors.affiliation: Naval Dental School, Bethesda, Maryland 20889-5602, USA.
authors.forename: E A
authors.initials: EA
authors.lastname: Applequist
authors.forename: J C
authors.initials: JC
authors.lastname: Meiers
mesh_terms: D002516:Ceramics; D016009:Chi-Square Distribution; D003188:Composite Resins; D003763:Dental Leakage / Q000517:prevention & control*; D003793:Dental Restoration, Permanent / Q000295:instrumentation / Q000379:methods*; D005069:Evaluation Studies as Topic; D005898:Glass; D006801:Humans; D011108:Polymers / Q000737:chemistry; D011791:Quartz; D018709:Statistics, Nonparametric
chemical_list: C088834:Beta-Quartz glass-ceramic; D003188:Composite Resins; D011108:Polymers; D011791:Quartz