Clinical evaluation of stress-reducing direct composite restorations in structurally compromised molars: a 2-year report.
OBJECTIVE
To evaluate the clinical performance of class II large-size direct composite restorations.


METHODS
Fifty (50) patients 18 years or older were included in this clinical trial restoring 75 vital molar teeth with large-size cavities.


METHODS
Occlusal extension greater than two-thirds the intercuspal distance and proximal extension greater than half the distance between line angles. Teeth with residual cavity walls less than 1 mm and with one or more cusps involved were excluded. Teeth were randomly divided in three groups. Group 1: Opti-Bond FL; group 2: Scotchbond 1 XT; group 3: PQ1. Total-etching was performed using 35% phosphoric acid followed by the application of 2% chlorhexidine gluconate in the three groups. All teeth were restored using Vit-l-escence microhybrid composite resin. The proximal surface was built up first, followed by dentin and enamel occlusal surface stratification; wedge-shaped increments of composite resin were placed and cured using the UltraLume V curing light through a combination of pulse and progressive curing techniques.


RESULTS
Restorations were evaluated at six-month intervals during the two-year period using a modified US Public Health Service criteria by two independent evaluators precalibrated at 85% reliability. No failures were reported and α scores were recorded for all parameters. Statistical analysis was performed using a χ(2) test and the Fisher exact test (χ(2)=10.6; p=0.001). No teeth exhibited sensitivity in the three groups both at the two-week recall and two-year follow-up.
Tufts University, Boston, MA, USA.
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Deliperi
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DN
Bardwell
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D
Alleman
D000134:Acid Etching, Dental; D000891:Anti-Infective Agents, Local / Q000737:chemistry; D002710:Chlorhexidine / Q000031:analogs & derivatives / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry*; D055117:Curing Lights, Dental / Q000145:classification; D001840:Dental Bonding; D003737:Dental Cavity Preparation / Q000145:classification; D003743:Dental Enamel / Q000473:pathology; D003764:Dental Materials / Q000737:chemistry*; D003793:Dental Restoration, Permanent / Q000145:classification* / Q000379:methods; D003804:Dentin / Q000473:pathology; D003807:Dentin Sensitivity / Q000145:classification; D017220:Dentin-Bonding Agents / Q000737:chemistry; D004311:Double-Blind Method; D005500:Follow-Up Studies; D006801:Humans; D008963:Molar / Q000473:pathology*; D010756:Phosphoric Acids / Q000737:chemistry; D058105:Polymerization; D019279:Resin Cements / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties
D000891:Anti-Infective Agents, Local; D003188:Composite Resins; D003764:Dental Materials; D017220:Dentin-Bonding Agents; C469607:OptiBond FL; C119199:PermaQuik; D010756:Phosphoric Acids; D019279:Resin Cements; C515948:Vit-l-escence Trans Ice; C041330:Scotchbond; C030242:phosphoric acid; C010882:chlorhexidine gluconate; D002710:Chlorhexidine