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Dentin Bonding Testing Using a Mini-interfacial Fracture Toughness Approach
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نویسنده
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pongprueksa p. ,de munck j. ,karunratanakul k. ,barreto b.c. ,van ende a. ,senawongse p. ,van meerbeek b.
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منبع
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journal of dental research - 2016 - دوره : 95 - شماره : 3 - صفحه:327 -333
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چکیده
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Measurement of interfacial fracture toughness (ift) is considered a more valid method to assess bonding effectiveness as compared with conventional bond strength testing. common fracture toughness tests are,however,laborious and require a relatively bulky specimen size. this study aimed to evaluate a new simplified and miniaturized ift (mini-ift) test. four dentin adhesives,representing the main adhesive classes,and 1 glass ionomer cement were applied onto flat dentin. mini-ift (1.5 × 2.0 × 16 to 18 mm) and microtensile bond strength (μtbs; 1.5 × 1.5 × 16 to 18 mm) specimens were prepared from the same tooth. for the mini-ift specimens,a single notch was cut at the adhesive-dentin interface with a 150-μm diamond blade under water cooling; the specimens were loaded until failure in a 4-point bending test setup. finite element analysis was used to analyze stress distribution during mini-ift testing. the correlation between the mean mini-ift and μtbs was examined and found to be significant; a strong positive correlation was found (r2 = 0.94,p = 0.004). weibull data analysis suggested the mini-ift to vary less than the μtbs. both the mini-ift and the μtbs revealed the same performance order,with the 3-step etch-and-rinse adhesive outperforming the 2-step self-etch and 2-step etch-and-rinse adhesive,followed by the 1-step se adhesive and,finally,the glass ionomer cement. scanning electron microscopy failure analysis revealed the adhesive-dentin interface to fail more at the actual interface with the mini-ift test,while μtbs specimens failed more within dentin and composite. this finding was corroborated by finite element analysis showing stress to concentrate at the interface during mini-ift loading and crack propagation. in conclusion,the new mini-ift test appeared more discriminative and valid than the μtbs to assess bonding effectiveness; the latter test nevertheless remains more versatile. specimen size and workload were alike,making the mini-ift test a valid alternative for the popular μtbs test. © international & american associations for dental research 2016.
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کلیدواژه
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adhesive testing; adhesives; bond strength; finite element analysis; micro-tensile; Weibull
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آدرس
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biomat,department of oral health sciences,ku leuven,university of leuven,dentistry,university hospitals leuven,leuven,belgium,department of operative dentistry and endodontics,faculty of dentistry,mahidol university,bangkok, Thailand, biomat,department of oral health sciences,ku leuven,university of leuven,dentistry,university hospitals leuven,leuven, Belgium, national metal and materials technology center,national science and technology development agency,pathumthani, Thailand, biomat,department of oral health sciences,ku leuven,university of leuven,dentistry,university hospitals leuven,leuven,belgium,bmgo,biomechanics section,department of mechanical engineering,ku leuven,university of leuven,leuven, Belgium, biomat,department of oral health sciences,ku leuven,university of leuven,dentistry,university hospitals leuven,leuven, Belgium, department of operative dentistry and endodontics,faculty of dentistry,mahidol university,bangkok, Thailand, biomat,department of oral health sciences,ku leuven,university of leuven,dentistry,university hospitals leuven,leuven,belgium,biomat,department of oral health sciences,ku leuven,university of leuven,kapucijnenvoer 7,blok abox 7001,leuven, Belgium
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Authors
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