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 .
A prospective 15-year evaluation of extensive dentin-enamel-bonded pressed ceramic coverages.
OBJECTIVES The purpose of this study was to investigate the durability of extensive dentin-enamel-bonded posterior ceramic coverages  in a 15 years follow-up . METHODS All extensive dentin-enamel-bonded posterior partial and complete all-ceramic coverages placed during the period November 1992-December 1998 were included . In 121 patients , 252 coverages ( IPS Empress ) were placed . The adhesive bonding to dentin and enamel was performed with three 3-step and one 2-step etch and rinse bonding . In 106 restorations the classic Syntac was used in combination with the dual-cured resin composite Variolink . The other restorations were luted with the chemically cured resin composite Bisfil 2B and bonded with 3-step etch and rinse systems , classic Gluma ( 37 ) , Allbond 2 ( 57 ) , Syntac ( 32 ) or the 2-step etch and rinse system , One step ( 20 ) . The ceramics were evaluated yearly by modified USPHS criteria during 15 years . RESULTS Postoperative sensitivity was registered in 4 patients during bite forces lasting for 2 - 4 weeks . Fifty-five of 228 coverages ( 24.1 % ) failed . The mean observation period of the acceptable coverages was 12.6 years ( range 11 - 15 years ) . The main reasons for failure were lost restorations ( 18 ) , ceramic fracture ( 16 ) , and secondary caries ( 11 ) . Significant differences in failure rate were observed between the dentin bonding agents but not between the two luting agents . Ceramic  coverages placed on non-vital teeth failed in 39 % and on vital teeth in 20.9 % ( p=0.014 ) . Logistic regression indicated three significant predictors for failure of the coverages : gender and parafunctional habits of the patient and non-vitality of the tooth . SIGNIFICANCE The technique investigated showed advantages like less destruction of healthy tissue , and avoiding of endodontic treatment and /or deep cervical placement of restoration margins to obtain retention
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 .