Objective: This study compared the microleakage of Class V resin composite restorations placed with two self-etching adhesives PLP (Prompt
TM L-Pop, 3M ESPE) and OUB (One-Up Bond F, Tokuyama Corp), to that of restorations placed using a conventional adhesive SMP (ScotchBond
TM Multi-Purpose, 3M ESPE). Methods: Each adhesive was used with the same manufacturer’s hybrid resin composite (PLP, SMP = Z 250; OUB = Palfique Estelite). Restorations of the three adhesive/resin combinations were placed according to manufacturer’s instructions into Class V cavities of approximately 4 mm width x 3 mm height x 2 mm depth, with bevelled enamel margins, prepared at the CEJ on the facial and lingual surfaces of freshly-extracted third molars. Eight restorations of each combination of adhesive and resin were placed in an equal number of randomly assigned facial and lingual preparations, and were finished immediately after light curing. Restored teeth were subjected to 1000 thermal cycles (5°/55° C; 1 min. dwell), sealed except for restored areas with nail polish, and immersed for 4 hours in a 10% solution of methylene blue. After being embedded in resin, teeth were sectioned, yielding 48 sections of the restorations, a sample size of 16 for each combination. Each section was visually evaluated at 20x magnification for leakage along incisal and gingival margins, which was scored as no leakage, slight leakage, or severe leakage. Results: Only leakage along gingival margins was observed. Incidence(None/Slight/Severe) was: PLP = 11/4/1, OUB = 11/5/0, SMP = 8/7/1. Conclusion: Analysis of ranked leakage data showed no significant difference between the materials (one-way ANOVA; P>0.05).
This study was supported by UNMC College of Dentistry Student Summer Research Fellowship FY03-05.