Conclusion The current best evidence indicates that a glass ionomer cement has a significantly lower risk of loss of a NCCL restoration compared to either a three-step etch- and -rinse or a two-step etch- and -rinse adhesive system ; a three-step etch- and -rinse adhesive system has a significantly lower risk of loss of a NCCL restoration compared to a two-step etch- and -rinse adhesive system .
No significant difference could be observed in the risk of loss of a tooth-colored NCCL restoration between a three-step etch- and -rinse adhesive system and either a two-step self-etch or a one-step self-etch adhesive system
Objectives The aim of this review was to assess the effect of different adhesive systems and tooth preparation on the retention of tooth-colored restorative material s  placed in non-carious cervical lesions ( NCCLs ) .
Three-year clinical performance of a HEMA-free one-step self-etch adhesive in non-carious cervical lesions.
Despite the fact that one-step adhesives are currently used routinely in clinical practice , long-term studies on their clinical performance are scarce . The objective of this r and omized controlled clinical trial was to test the hypothesis that a 2-hydroxyethyl methacrylate (HEMA)-free one-step self-etch adhesive performs worse than a conventional multistep etch- and -rinse adhesive .  Two-hundred and seventy-six non-carious cervical lesions in 52 patients were restored with a micro-hybrid composite  ( Gradia Direct ; GC ) . These restorations were bonded in r and om order either with the HEMA-free one-step adhesive G-Bond ( GC ) or with the ' gold-st and ard ' ( control ) three-step adhesive Optibond FL ( Kerr ) . The restorations were evaluated after 6 , 12 , 24 , and 36 months of clinical service regarding retention , marginal adaptation , microleakage , caries occurrence , and sensitivity . After a medium-long period of 3 yr , similar success in clinical performance was observed for the simplified all-in-one adhesive and the conventional three-step adhesive . However , the one-step adhesive exhibited significantly more incisal marginal defects and discolorations . Whereas marginal degradation appeared to arrest for the multistep etch- and -rinse adhesive after 12 months , the enamel margins of the restorations bonded with the one-step self-etch adhesive continued to deteriorate . These incisal marginal defects were , however , small and could easily be removed by polishing . For both adhesives , large and sclerosed lesions appeared to be at higher risk of retention loss
Conclusion The current best evidence indicates that a glass ionomer cement has a significantly lower risk of loss of a NCCL restoration compared to either a three-step etch- and -rinse or a two-step etch- and -rinse adhesive system ; a three-step etch- and -rinse adhesive system has a significantly lower risk of loss of a NCCL restoration compared to a two-step etch- and -rinse adhesive system .
No significant difference could be observed in the risk of loss of a tooth-colored NCCL restoration between a three-step etch- and -rinse adhesive system and either a two-step self-etch or a one-step self-etch adhesive system
Objectives The aim of this review was to assess the effect of different adhesive systems and tooth preparation on the retention of tooth-colored restorative material s  placed in non-carious cervical lesions ( NCCLs ) .