According to this review , the 3-step adhesive systems were the best performing and still are the gold st and ard for the cementing of indirect restorations .
In addition , it can be concluded that self-etched adhesive systems reduce the time spent in clinical practice , however at the interface level they behave as permeable membranes more susceptible to degradation
New technologies are changing the therapeutical options to do indirect restorations and new adhesive systems are continuously introduced to be used by clinicians .
Different interactions between restorations , adhesive systems components , enamel and dentin require having criteria based on the selection of the adhesive system , ensuring the longevity of the restorations and the preservation of the biological remnant .
The adhesion force to the dental tissue is one of the indicatives of the behavior of the adhesive systems and influences the behavior of the treatments with direct and indirect restorations .
The objective of this search was to find the adhesive systems with the best results in terms of the adhesion strength of indirect restorations  on the dental tissues .
Bond durability of self-adhesive composite cements to dentine.
OBJECTIVES Clinical ly , the most easy-to-use composite cements are the so-called self-adhesive composite cements ( SAC 's ) . Hardly any data is however today available on the long-term bonding effectiveness of such luting composites . The purpose of this study was to evaluate the bond durability of different composite cements used to lute feldspathic ceramic blocks onto dentine . METHODS Four SAC 's ( Clearfil SA Cement , Kuraray ; G-CEM , GC ; SmartCem2 , Dentsply ; Unicem 3 M ESPE ) , one ' self-etch ' ( Clearfil Esthetic Cement , Kuraray ) and one ' etch- and -rinse ' ( Variolink ll , Ivoclar-Vivadent ) multi-step composite cement were used to lute feldspathic ceramic blocks ( Vita Mark II , Vita ) onto dentine surfaces . Teeth were distributed r and omly in 24 experimental groups according to two different surface-preparation techniques ( ' SMEAR-COVERED ' versus ' SMEAR-FREE ' ) and storage conditions ( ' IMMEDIATE ' versus ' AGED ' ) . Failure patterns were evaluated with a stereomicroscope , and afterwards imaged using Feg-SEM . Two additional specimens were processed for cement-dentine interfacial analysis using TEM . RESULTS A linear mixed effects statistical model revealed significant differences for the variables ' composite cement ' , ' surface preparation ' and ' ageing ' . All self-adhesive composite cements , except Unicem ( 3 M ESPE ) , did bond less favourably to fractured dentine . TEM revealed an ultra-structurally different interaction of the composite cements with ' SMEAR-COVERED ' and ' SMEAR-FREE ' dentine . CONCLUSION All SAC 's suffered most when luted to ' SMEAR-FREE ' ( fractured ) dentine , fortunately of no clinical relevance and most likely due to enhanced water sorption through the open tubules . When luted to ' SMEAR-COVERED ' dentine , all SACs appeared equally effective and durable as the ' etch- and -rinse ' and ' self-etch ' multi-step composite cements . Solely the SAC SmartCem2 ( Dentsply ) appeared clearly less favourable and consistent
According to this review , the 3-step adhesive systems were the best performing and still are the gold st and ard for the cementing of indirect restorations .
In addition , it can be concluded that self-etched adhesive systems reduce the time spent in clinical practice , however at the interface level they behave as permeable membranes more susceptible to degradation
New technologies are changing the therapeutical options to do indirect restorations and new adhesive systems are continuously introduced to be used by clinicians .
Different interactions between restorations , adhesive systems components , enamel and dentin require having criteria based on the selection of the adhesive system , ensuring the longevity of the restorations and the preservation of the biological remnant .
The adhesion force to the dental tissue is one of the indicatives of the behavior of the adhesive systems and influences the behavior of the treatments with direct and indirect restorations .
The objective of this search was to find the adhesive systems with the best results in terms of the adhesion strength of indirect restorations  on the dental tissues .