title: The effect of cervical grooves on the contraction gap in class 2 composites.
abstract: The extent and the width of the cervical contraction gap in class 2 composite resin restorations were examined using a fluorescent resin-penetrating technique. In all restorations Scotchbond 2 bonding system and P-50 were used. The cervical wall was prepared either with no groove or with one or two grooves. The results indicated that the extent of the contraction gap was reduced when two retention grooves were prepared. The difference between no groove and two grooves was statistically significant. The width of the gap was also reduced, but not with statistical significance. A statistical difference was also found when one retention groove was compared with no groove.
authors.affiliation: Karolinska Institutet, School of Dentistry, Department of Oral Pathology, Huddinge, Sweden.
authors.forename: P
authors.initials: P
authors.lastname: Coli
authors.forename: M
authors.initials: M
authors.lastname: Blixt
authors.forename: M
authors.initials: M
authors.lastname: Brännström
mesh_terms: D000704:Analysis of Variance; D001641:Bicuspid; D017438:Bisphenol A-Glycidyl Methacrylate; D016009:Chi-Square Distribution; D003188:Composite Resins / Q000737:chemistry; D003737:Dental Cavity Preparation / Q000379:methods*; D003763:Dental Leakage / Q000517:prevention & control*; D006801:Humans; D019279:Resin Cements
chemical_list: D003188:Composite Resins; D019279:Resin Cements; C065771:P50 composite resin; C067788:scotchbond 2; D017438:Bisphenol A-Glycidyl Methacrylate