Clinical effectiveness of a low-shrinkage resin composite: a five-year evaluation.
OBJECTIVE
To study the durability of a recently developed low-shrinkage resin composite, suggested to counter the stress formation in direct resin composite restorations.


METHODS
Each of 50 patients received one or two pair(s) of Class II restorations. The first restoration in the pair was a low-shrinkage resin composite (InTen-S) and the second a hybrid resin composite restoration (Point 4). Both restorations were placed with an etch-and-rinse bonding system and an oblique layering technique. A total of 106 restorations, 33 premolar and 73 molars, were placed. The restorations were evaluated annually.


RESULTS
At 5 years, 97 restorations were evaluated. Two participants reported slight postoperative sensitivity symptoms for a few weeks after placement. Twelve non acceptable restorations were observed during the 5 years, five InTen-S (10.4%) and 7 Point 4 (14.3%) (not significant). Secondary caries was the main reason for failure (8) followed by composite fracture (2) and tooth fracture (2).


CONCLUSIONS
The low-shrinkage resin composite showed good durability, but not significantly better than the control resin composite in Class II cavities. Most failures occurred at the last part of the study. Secondary caries was the main reason for failure.
van Dijken
Jan W V
JW
Department of Odontology, Dental School Umeå, Umeå University, Umeå, Sweden. Jan.van.Dijken@odont.umu.se
Lindberg
Anders
A
D000293:Adolescent; D000328:Adult; D017438:Bisphenol A-Glycidyl Methacrylate / Q000009:adverse effects; D003188:Composite Resins / Q000009:adverse effects / Q000737:chemistry; D003731:Dental Caries / Q000209:etiology; D003737:Dental Cavity Preparation / Q000379:methods; D003763:Dental Leakage / Q000209:etiology; D018772:Dental Marginal Adaptation; D019232:Dental Restoration Failure; D003793:Dental Restoration, Permanent / Q000009:adverse effects / Q000379:methods*; D003799:Dental Stress Analysis; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D055815:Young Adult
D003188:Composite Resins; C485362:InTen-S composite; C451741:point 4 composite resin; D017438:Bisphenol A-Glycidyl Methacrylate