Dentin permeability: Effects of smear layer removal

Pashley, David H.; Michelich, Virginia J.; Kehl, Thomas

doi:10.1016/0022-3913(81)90243-2

Cited by 257 publications

(158 citation statements)

References 13 publications

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“…The interface between the restorative material and tooth surface of a cavity preparation is 10 to 20 microns wide, permitting bacterial access (Pashley, 1984).…”

Section: Discussionmentioning

confidence: 99%

“…This smear layer of cut tissue debris exists at the tooth surface-material interface, which is soluble in organic acids, can have beneficial characteristics and can function as a natural cavity liner that reduces dentin permeability. Conversely, the smear layer can interfere with adhesion of materials to the dentin substrate, serving as a reservoir for caries producing microorganisms, and potentially promotes pulpal inflammation and possible restoration replacement (Pashley, 1984).…”

Section: Introductionmentioning

confidence: 99%

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Marginal Permeability of Self-etch and Total-etch Adhesive Systems

Owens

Johnson

Harris

2006

Operative Dentistry

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Decreased leakage was associated with Adper Scotchbond Multi-Purpose (total etch) and iBond (self-etch) systems in Class V resin composite restorations. All adhesive systems performed best when bonded to enamel compared to dentin surface anatomy. Clinicians should be aware that strict adherence to manufacturer instructions, when using these materials, is of primary importance. SUMMARYThis study evaluated microleakage in vitro of selfetch and multi-step, total-etch adhesive systems. Ninety-six extracted non-carious human molars were randomly assigned to eight groups (n=12) and restored with different adhesive systems: Optibond Solo Plus, iBond, Adper Prompt L-Pop, Xeno III, Simplicity, Nano-Bond, Adper Scotchbond Multi-Purpose and Touch & Bond. Each group was treated following the manufacturer's instructions. Class V cavities were prepared on the facial or lingual surfaces of each tooth with coronal margins in enamel and apical margins in cementum (dentin). The teeth were restored with Z-100 resin composite. After polishing with Sof-Lex disks, the teeth were thermocycled for 1000 cycles and coated with nail varnish to within 1.0 mm of the restoration. The teeth were stained in 1% methylene blue dye for 24 hours and sectioned from the facial to lingual surface. Dye penetration (microleakage) was examined with a 20x binocular microscope. Enamel and dentin margin leakage was scored on a 0 to 3 ordinal scale. Data were analyzed using Kruskal-Wallis Analysis of Variance and Mann-Whitney U tests. Comparison of the adhesive groups at the enamel margin revealed: 1) Adper Scotchbond MultiPurpose exhibited significantly less leakage than the other adhesive groups (except iBond); 2) among the self-etch adhesive groups, iBond exhibited significantly less leakage than Nano-Bond and 3) the other adhesive groups clustered intermediately. In contrast, there were no significant differences among the adhesive groups when the dentin margin was evaluated. A Wilcoxin signed rank test showed significantly less leakage at the enamel margins compared to the dentin margins of the eight adhesive systems tested. All data were submitted to statistical analysis at p<0.05 level of significance.

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“…The interface between the restorative material and tooth surface of a cavity preparation is 10 to 20 microns wide, permitting bacterial access (Pashley, 1984).…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Marginal Permeability of Self-etch and Total-etch Adhesive Systems

Owens

Johnson

Harris

2006

Operative Dentistry

View full text Add to dashboard Cite

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“…These inadequacies can include incomplete alteration and/or removal of smear layer components due to composition (pH, osmolality) and strength of the acidic primer, and inadequate resin film thickness, requiring multiple layering techniques and changes in the monomer/water ratio, resulting in phase separations. [1][2][3]9,16,[19][20][21][22] Morphological and histological considerations, and other clinical factors causing inadequate bonding at the material/tooth surface interface, include cavity configuration (C-factor) and dentinal tubule/enamel rod orientation, capillary movement of dentinal tubular fluids, physical characteristics of the restorative material (filler loading, volumetric expansion, modulus of elasticity and polymerization contraction), inadequate margin adaptation of the restorative material during insertion, inappropriate barrier protection (dental rubber dam), tooth location, occlusal stresses/tooth flexure and patient age considerations. [23][24][25][26][27][28][29][30][31] In this study, since hybrid layer morphology was not evaluated microscopically, the specific nature of restoration failure (microleakage) for each adhesive system is unknown, although several factors were strongly suspected: inefficiency of acidic monomers in alteration of the smear layer for classic hybrid layer formation, cavity C-factor, orientation of dentinal tubules/enamel rods to the cementoenamel junction, use of acetone-based solvent primer systems and post-treatment stresses caused by polymerization contraction.…”

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confidence: 99%

Effect of Single Step Adhesives on the Marginal Permeability of Class V Resin Composites

Owens¹,

Johnson²

2007

Operative Dentistry

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SUMMARYThis in vitro study evaluated the coronal and apical marginal microleakage of four self-etch, seventh generation adhesive systems.Sixty non-carious human molars were randomly assigned to four groups (n=12). Class V cavities were prepared on the facial or lingual surface of each tooth with coronal margins in enamel and apical margins in cementum (dentin) at the cementoenamel junction. The preparations were restored using four self-etch adhesive systems (iBond, G-Bond, Xeno IV and Clearfil S 3 Bond) and a control (no adhesive), followed by insertion of Gradia Direct microfilled hybrid resin composite. The teeth (specimens) were thermocycled 1,000 cycles, immersed in 1% methylene blue dye for 24 hours and invested in acrylic resin. The specimen blocks were then sectioned longitudinally, with dye penetration (microleakage) examined using a 20x binocular microscope. Coronal and apical margins were scored separately for microleakage using a 0-3 ordinal ranking system. Data were analyzed using non-parametric tests at a p<0.05 level of significance. A comparison of adhesive and control groups at the coronal and apical margins revealed that significant (p<.0001) differences were exhibited. At the coronal margin, Xeno IV revealed significantly less leakage than the other adhesives, with Clearfil S 3 Bond exhibiting significantly less leakage at the apical margin. Groups with no adhesive treatment (control) showed significantly greater leakage at both the coronal and apical margin locations. A Wilcoxon signed rank test showed no significant differences at the coronal compared to the apical margins of the four adhesive systems and control tested.

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“…37 However, the results of another study showed that applying Diode laser in comparison with mechanical and chemical methods, causes more elimination of E. faecalis in the apical part of root canals. 38 In the study by Kuvvetli et al, the effects of Er:YAG laser in molar primary teeth was similar to the effects of NaOCL 1.25%. 15 Therefore, it seems lasers can be effective in root canal disinfection.…”

Section: Discussionmentioning

confidence: 99%

The Effect of Er:YAG Laser on Entroccocus faecalis Bacterium in the Pulpectomy of Anterior Primary Teeth

et al. 2017

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Introduction: Successful root canal therapy depends on the complete elimination of microorganisms such as Entroccocus faecalis, which is impossible to achieve with the traditional methods. Lasers are recently introduced as a new method to solve the problem. The present study is planned and performed to examining the antibacterial effect of Er: YAG laser. Methods: Sixty extracted anterior primary teeth were prepared and sterilized. E. faecalis bacterium was cultured in canals. Samples were randomly divided into two groups. The first group was disinfected by NaOCl 5/25% and Er: YAG laser and the second group just by NaOCl 5/25%. Samples of canal contents were cultured and colony counts were calculated. The results were analyzed statistically by SPSS software and Mann Whitney test. Results: There was no significant difference between colony counts in both groups (P = 0.142). But the number of colonies in the first group was lower than in the second group. Conclusion: Although, Er: YAG laser cannot completely eliminate E. faecalis bacterium, its simultaneous use with NaOCl decreases E. faecalis.

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Dentin permeability: Effects of smear layer removal

Cited by 257 publications

References 13 publications

Marginal Permeability of Self-etch and Total-etch Adhesive Systems

Marginal Permeability of Self-etch and Total-etch Adhesive Systems

Effect of Single Step Adhesives on the Marginal Permeability of Class V Resin Composites

The Effect of Er:YAG Laser on Entroccocus faecalis Bacterium in the Pulpectomy of Anterior Primary Teeth

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