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- W85752837 abstract "This thesis studies the in vitro capability of fourteen systems, proposed to treat dentin sensibility(DS), to seal dentine tubules, to reduce dentin permeability and to evaluate the effect of wetness andtooth brushing on these agents.MATERIALS AND METHODS: 140 dentin samples, obtained from human third molars, weredivided into fourteen groups of 10 each. Ten discs from each group were mounted in a perfusion devicebased on the Pashleys system. Each disc was etched with 35% phosphoric acid. Permeability wasmeasured for the disc and this value was considered the reference value (100%). After treatment witheach agent, permeability was measured again after one hour. One was studied under SEM. After this,nine were water washed, and then, flow was measured. One was studied under SEM. Eight molars weresubjected to simulated tooth brushing equivalent to three weeks of normal brushing, permeability wasmeasured, and samples studied under SEM. The agents studied were Ami-dent-Sealant, KDM-Flustady,Systemp-desensitizer, Excite, Scotchbond-1, Seal&Protect, Promp-L-pop, Clearfill-SE Bond, Duraphat,NMTD-4.RESULTS: Tooth brushing increased tubular permeability in all cases. Seal&Protect showed thegreatest amount of tubular occlusion among the unbrushed and brushed samples, and the lowest dentinalperfusion rates.DISCUSSION: A great number of adhesives have been proposed to treat DS based on successfulstudies in perfusion and SEM. Using the same methodology we had found worse results. The onlyexplanation could be that we worked with a positive pressure device. The use of a wet dentin and theflow of dentinal tubules havent been considered in previous studies of DS. Tay studies new adhesivesworking with positive pressure and found the presence of Osmotic Blistering and Water Trees in thedepth of dentin adhesives that can justify the post operative sensitivity of composite restorations.Osmotic blistering can explain lacuna defect images in the adhesive samples that we find; thisindicates that positive pressure should be incorporated in the new in vitro studies of DS to simulate theoral conditions.CONCLUSIONS: All systems reduced dentinal perfusion when applied. After brushing, allsystems increased perfusion. Best results are obtained by specific adhesive systems with filler." @default.
- W85752837 created "2016-06-24" @default.
- W85752837 creator A5077167275 @default.
- W85752837 date "2006-07-13" @default.
- W85752837 modified "2023-09-24" @default.
- W85752837 title "Estudio in vitro de catorce productos propuestos para el tratamiento de la sensibilidad dentinaria mediante el uso de un sistema de perfusión de dentina y microscopía electrónica de barrido." @default.
- W85752837 hasPublicationYear "2006" @default.
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