Effects of Contamination and Mechanical Disturbance on the Quality of Acid-Etched Enamel

Hormati, Abbas A.; Fuller, James L.; Denehy, Gerald E.

doi:10.14219/jada.archive.1980.0033

Cited by 112 publications

(73 citation statements)

References 5 publications

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“…Because of the high enamel reactivity induced by phosphoric acid etching, even minute exposures to saliva, as brief as 1 s, could be sufficient to create a pellicle that partially occludes the enamel pores, causing ultrastructural alterations and preventing formation of the resin tags responsible for mechanical retention (8). The use of adhesive systems underneath sealant restorations has been suggested to minimize the deleterious effects of salivary contamination to adhesion (4).…”

Section: Discussionmentioning

confidence: 99%

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Bond Strength of a Bisphenol-A-Free Fissure Sealant With and Without Adhesive Layer under Conditions of Saliva Contamination

et al. 2016

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Dental sealants are important for prevention of carious lesions, if they have good shear strength. The aim of this study was to evaluate the shear bond strength (SBS) of two sealants to saliva-contaminated and non-contaminated enamel with and without an intermediate adhesive layer underneath the sealant. Ninety flat enamel surfaces from human third molars were randomly assigned to 6 groups (n=15): F (control): Fluroshield™ sealant; EWB (control): Embrace™ WetBond™; SB/F: Single Bond adhesive system + F; SB/ EWB, s-SB/F and s-SB/EWB. In the s-SB/F and s-SB/EWB groups, the acid-etched enamel was contaminated with 0.01 mL of fresh human saliva for 20 s. Sealant cylinders were bonded to enamel surface with and without an intermediate adhesive system layer. The shear tests were performed using a universal testing machine (0.5 mm/min). Data were analyzed statistically by Kruskal-Wallis and Mann-Whitney tests (α=0.05). F presented higher mean SBS than EWB in all experimental conditions. The lowest SBS mean was obtained for EWB on contaminated enamel (p<0.05). In conclusion, an adhesive system layer should be used prior to sealant placement, in both dry and saliva-contaminated enamel. F had the best performance in all experimental conditions. EWB sealant showed very low results, but an adhesive layer underneath the sealant increased its SBS even after salivary contamination.

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Section: Discussionmentioning

confidence: 99%

“…The microspores produced by acid etching may be partially occluded after a contamination time as short as one second (7). This partial obliteration prevents the ideal formation of resin tags, thus weakening sealant retention (8).…”

Section: Introductionmentioning

confidence: 99%

Bond Strength of a Bisphenol-A-Free Fissure Sealant With and Without Adhesive Layer under Conditions of Saliva Contamination

et al. 2016

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“…Inspection showed that a satisfactory fit for each curve was obtained for the logistic dose response function: (1) where t is the time, z the cumulative amount of oil discharged, a is the scale factor, b the transition centre (ie the 50% point), and c controls the steepness of the plot. The values of the fitted parameters are shown in Table 1 along with the coefficient of determination for the fit (r 2 ) and the width of the transition w calculated as: (2) In effect, the parameter a estimates the amount of oil originally present.…”

Section: Results and Analysismentioning

confidence: 99%

Discharge of lubricant from air turbine handpieces

2005

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O Ob bj je ec ct ti iv ve e To demonstrate and quantify the discharge of lubricating oil from high-speed air turbine handpieces whilst running. M Ma at te er ri ia al ls s a an nd d m me et th ho od ds s Dye-marked oil (Kavospray, KaVo) was used to lubricate four handpieces (Quiet-Air, Midwest) and the air discharged from around the lower bearing was directed at the moving chart paper on a recorder whilst running for 40 minutes. Secondly, seven new handpieces (Quiet-Air, 300SE, Midwest; Topair 796, Topair 795, W&H; VIP-Σ, Pana-air, NSK; Lares, Lares Research) were cleaned, weighed and then lubricated with unmarked oil (Kavospray, KaVo). Oil discharge was determined gravimetrically over runs of 240 minutes. Data were fitted to the logistic dose response function. R Re es su ul lt t The dye-marked oil tests showed that oil was discharged for at least 40 minutes in the direction of the bur. The gravimetric tests showed that oil continued to be discharged up to at least 240 minutes, and that the usual practice of removing excess lubricant by running for 1-2 minutes was ineffective in preventing cut-surface contamination.

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“…5,14,16 The contamination of the etched area by saliva or blood leads to the sealing of most of the porosity created by enamel acid-etching, which prevents the penetration of the adhesive material, resulting in insufficient resin tags in both number and length, and compromises bonding. 7 Other studies also found statistically significant differences when materials were compared before and after saliva contamination, with no differences regarding the material employed, 6,16 although some studies have suggested differently about whether Transbond™ MIP may be the best choice for moist environments.…”

Section: Discussionmentioning

confidence: 99%

Influence of saliva contamination on the shear bond strength of adhesives on enamel

Assad-Loss¹,

Tostes²,

Mucha³

2012

Dental Press J. Orthod.

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Influence of saliva contamination on the shear bond strength of adhesives on enamel original articleObjective: To evaluate shear bond strength of 3 adhesive systems (Single Bond, Transbond™ MIP and Transbond™ XT) applied on bovine enamel under saliva contamination condition. Method:One hundred and twenty enamel surfaces of bovine incisors were divided into 6 groups (n = 20) according to the adhesive system used (Transbond™ XT, Transbond™ MIP and Single Bond) with or without saliva contamination. For each adhesive system, there were two groups defined as no contamination group (NC): 37% H 3 PO 4 conditioning for 30 seconds and two layers of adhesive systems; saliva contamination group (SC): After the first adhesive layer application, the examined areas were contaminated with saliva. Samples were mounted appropriately for testing and stored in deionized water at 37 °C for 7 days. Samples were then submitted to shear bond strength trials at a speed of 0.5 mm/min. The Adhesive Remnant Index (ARI) was evaluated under stereomicroscopy. Twoway analysis of variance and the Tukey test were used to compare mean values (α = 0.05).Results: Groups XT (NC) = 26.29 ± 7.23; MIP (NC) = 24.47 ± 7.52 and SB (NC) = 32.36 ± 4.14 XT (SC) = 19.59 ± 6.76; MIP (SC) = 18.08 ± 6.39 and SB (SC) = 18.18 ± 7.03 MPa. ARI 0 and 1 were the most prevalent scores in all study groups examined. Conclusion:Saliva contamination significantly decreased bond strength of the three adhesive systems examined (p <0.05). However, the comparison of groups with and without saliva contamination did not reveal any significant differences, and, therefore, the three systems may be considered equivalent.

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Effects of Contamination and Mechanical Disturbance on the Quality of Acid-Etched Enamel

Cited by 112 publications

References 5 publications

Bond Strength of a Bisphenol-A-Free Fissure Sealant With and Without Adhesive Layer under Conditions of Saliva Contamination

Bond Strength of a Bisphenol-A-Free Fissure Sealant With and Without Adhesive Layer under Conditions of Saliva Contamination

Discharge of lubricant from air turbine handpieces

Influence of saliva contamination on the shear bond strength of adhesives on enamel

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