Two-year clinical evaluation of proanthocyanidins added to a two-step etch-and-rinse adhesive.

Abstract

OBJECTIVE\nTo compare the clinical behavior of Proanthocyanidins (PA)-free and PA-containing two-step etch-and-rinse adhesive used underneath resin composite restorations in non-carious cervical lesions (NCCLs) over a 6- (6\u2009M) and 24-month (24\u2009M) period.\n\n\nMETHODS\n135 restorations were randomly placed in 45\u2009subjects. The NCCLs were conditioned (37% phosphoric acid for 15\u2009s) and distributed into 3 groups: Control (EX0) - ExciTE F (Ivoclar Vivadent) adhesive applied following the manufacturer s recommendations; EX2 and EX5 - 2\u2009wt% and 5\u2009wt% of PA were added to ExciTE F, respectively, and applied as in EX0. Resin composite was placed incrementally and light-cured. The restorations were evaluated at baseline, 6\u2009M and 24\u2009M, using FDI and USPHS criteria. Statistical analyses were performed using Friedman and Wilcoxon tests (α\u2009=\u20090.05).\n\n\nRESULTS\nThe retention rates were 98% (95% confidence interval 88-99%) for EX0, 92% (80-97%) for EX2; and 85% (72-93%) for EX5 at 6\u2009M. A significant difference was found only for EX5 at 6\u2009M when compared with the respective baseline findings (p\u2009=\u20090.03) and when compared with EX0 and EX2 (p\u2009=\u20090.001) at 6\u2009M. After 24\u2009M, the retention rates were 98% (88-99%) for EX0, 73% (59-84%) for EX2, and 71% (56-82%) for EX5. Only EX0 did not result in significant difference in retention rate at 24\u2009M when compared with baseline but showed a significant higher retention rate when compared with those of EX2 and EX5 (p\u2009=\u20090.001).\n\n\nCONCLUSION\nAdding proanthocyanidins to the adhesive solution jeopardized the retention of composite resins restorations in non-carious cervical lesions after 24 months.\n\n\nCLINICAL RELEVANCE\nIn spite of being user-friendlier than when used separately, the incorporation of proanthocyanidins into the adhesive solution impairs the longevity of composite restorations.