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Query: UMLS:C0432222 (SEM)
 47,337 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The purpose of this study was to assess the dentin bond strength of four adhesives and the interfacial micromorphology in primary and permanent teeth. Thirty-two for each primary and permanent molar were divided into four groups. Buccal and lingual dentin surfaces were wet ground up to 600 grit. The teeth were bonded following the manufacturers' instructions, thermocycled (500x), mounted on plaster and sheared with instron machine. Some teeth were sectioned for SEM evaluation. The mean bond strengths (in MPa) for primary and permanent teeth respectively were: Scotchbond Multipurpose 19.4 +/- 4.0, 18.9 +/- 4.8; One Step 30.6 +/- 3.6, 35.6 +/- 1.9, Prime and Bond 2.1 28.3 +/- 4.8, 31.8 +/- 4.0, EBS Bond 31.5 +/- 4.6, 33.6 +/- 4.8. There was no significant difference between the last three adhesives nor between primary and permanent teeth except with One Step. All the adhesives formed a hybrid layer which was wider in permanent teeth. It was concluded that the products tested produced a strong bond strength to dentin and may function well clinically. The bond strength was not totally dependent on hybrid layer formation.
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PMID:Bond strength and interfacial micromorphology of four adhesive systems in primary and permanent molars. 966 44

The aim of this in vitro study was to compare the dentin bond strength and marginal adaptation of direct composite resins with and without additional NaOCl treatment after the etching process. A total of 150 cavities were prepared into disks of freshly extracted human third molars and filled with direct composite resins. Dentin adhesives of the fourth (with total etching: Scotchbond Multi-Purpose Plus, EBS, and Solid Bond), and fifth generation (one-bottle adhesives: Prime&Bond 2.1, Syntac Sprint) were used in combination with corresponding composite resin materials. Dentin disks without cavity preparation treatment served as controls. After 24 hours of storage and 24 hours of thermocycling (1150 cycles), replicas were made and push-out testing was performed. Replicas were examined regarding marginal adaptation using SEM (X200 magnification). In general, fourth-generation dentin adhesives produced better results in bond strength and marginal adaptation than fifth-generation one-bottle systems (P < 0.05). Within the fourth generation, Scotchbond Multi-Purpose Plus and EBS achieved significantly higher push-out values and percentages of gap-free margins than Solid Bond (P < 0.05). After hypochlorite treatment, dentin bond strength (-25%) and marginal adaptation (-30%) decreased significantly (P < 0.05) in all groups.
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PMID:Dentin bond strength and marginal adaption after NaOCl pre-treatment. 1120 89

The aim of this in vitro study was to evaluate dentin bond strength and marginal adaptation of direct resin composite fillings after different storage times. Three hundred sixty cavities were prepared in discs of freshly extracted human third molars and filled with resin composites. Multistep self-etching adhesives (Syntac Classic, A.R.T. Bond, both with and without total etching), three-step etch-and-rinse adhesives (Scotchbond Multi-Purpose Plus, EBS), and two-step etch-and-rinse adhesives (Prime and Bond 2.0, Syntac Single-Component) were used for bonding. After 1, 90, and 2190 days of water storage and 24 h thermocycling (1150 cycles), push-out testing was performed. From the 6-year group, replicas were made after 1 day, 90 days, and 1, 2, 3, 4, 5, and 6 years, and examined regarding marginal adaptation under an SEM (x 200 magnification). In all groups under investigation, push-out bond strengths remained stable after 90 days; however, the strengths significantly decreased after 6 years of water storage. The two-step systems exhibited lower bond strengths than three-step systems after 6 years. Marginal analysis revealed a significant loss regarding the percentage of perfect margins having been stable after 2 years for the three-step etch-and-rinse systems. Overall, the older three-step systems proved to be more effective than the simplified adhesives Syntac Single-Component and Prime and Bond 2.0 with regard to bond strength and marginal adaptation.
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PMID:The effect of six years of water storage on resin composite bonding to human dentin. 2043 68