Die Haftfestigkeit eines universellen Adhäsives am Dentin im Vergleich und der Einfluss des Applikationsverfahrens

Aim of this study was to assess bond strength of the new adhesive Scotch-bondTM Universal (3M ESPE) to dentin, furthermore to analyze the influence of application mode and six months of water storage. To recieve the data 36 carees-free third molars were provided with class-I-cavities and subsequently applicated four different adhesives: The new ScotchbondTM Universal (3M ESPE) in Selective-Enamel-Etching- (ES) and in Etch-and-Rinse-mode (ET), iBond® SelfEtch (I) (Heraeus) OptiBondTM Solo Plus (O) (Kerr) and Syntac® Classic (Ivoclar Vivadent) in Selective-Enamel-Etching- (SS) and Etch-and-Rinse-mode (ST). Cavities were closed with hybrid resin FiltekTM Z250 (3M ESPE) and polymerised by FLASHlite 1401® (Discus Dental). From every group one half of teeth (n=3) were sectioned into sticks and stored in water for six months (--2). The other half was directly processed (--1). Bond strength of these specimens was recorded in microtensile testing machine (calibration: distance < 5mm, speed 1mm/min, maximum force 50 N) and afterwards the breaking surface was measured. Statistical analysis was done by Shapiro-Wilk-test (p=0,001), Kruskal-Wallis-test (p<0,001) and multip-le Dunn-tests (p<0,05). Results: the new adhesive ScotchbondTM Universal achieved in both application modes comparably bonding strength (ES1: 18,6 +/- 9,7 MPa; ET1: 22,7 +/- 7,1 MPa) to the other bonding systems (I1: 16,7 +/- 5,6 MPa; O1: 21,8 +/- 7,8 MPa; SS1: 17,2 +/- 8,4 MPa; ST1: 19,1 +/- 9,4 MPa). The use of Etch-and-Rinse-mode yields with ScotchbondTM Universal in 20% improvement of bond strength in immediate measuring (ES1: 18,6 +/- 9,7 MPa → ET1: 22,7 +/- 7,1 MPa). After six months of water storage there is no difference detectable anymore (ES2: 22,4 +/- 4,9 MPa → ET2: 23,0 +/- 9,1 MPa). The six months of water storage reduce bond strength of OptibondTM Solo Plus to 86% and Syntac® Classic to 82% in Selective-Enamel-Etch-mode and to 59% in Etch-and-Rinse-mode. Water storage has less influence to bond strength of iBond® SelfEtch (95%) and Scotchbond TM Universal (ES1: 18,6 +/- 9,7 MPa → ES2: 22,4 +/- 4,9 MPa = 120%, ET1: 22,7 +/- 7,1 MPa → ET2: 23,0 +/- 9,1 MPa = 101%). Finally the following results need to be mentioned: • The bond strength of ScotchbondTM Universal to dentin in comparison to the ashesives iBond® SE, OptiBondTM Solo Plus und Syntac® Classic is encouraging. • The use of Etch-and-Rinse-mode does not improve significantly the ad-hesion of ScotchbondTM Universal. • The water storage for six months does not have a negative influence on bond strength of Scotchbond® Universal.