Effects of rotary instrumentation and different etchants on removal of smear layer on human dentin

Ayad, Mohamed F.

doi:10.1067/mpr.2001.112792

Cited by 38 publications

(38 citation statements)

References 19 publications

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“…There have been few published studies on the use of phosphoric acid for smear layer removal in endodontics. Some authors (3,15) recommended this agent for root canal preparation at concentrations of 10% or 32% in aqueous solution and of 37% in gel. Recent studies demonstrated that 5% phosphoric acid in combination with a solution of 2.5% NaOCl are effective for smear layer removal during root canal instrumentation (4) and have decalcification capacity on root dentin (16).…”

Section: Introductionmentioning

confidence: 99%

Cytotoxic effects of two acid solutions and 2.5% sodium hypochlorite used in endodontic therapy

Navarro-Escobar¹,

González-Rodríguez²,

Ferrer-Luque³

2009

Med Oral

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Navarro-Escobar E, González-Rodríguez MP, Ferrer-Luque CM. Cytotoxic effects of two acid solutions and 2.5% sodium hypochlorite used in endodontic therapy. Med Oral Patol Oral Cir Bucal. 2010 Jan 1;15 (1):e90-4.http://www.medicinaoral.com/medoralfree01/v15i1/medoralv15i1p90.pdf AbstractAim: To evaluate the cytotoxicity of 15% citric acid, 5% phosphoric acid and 2.5% NaOCl on cultured fibroblasts using MTT colorimetric assay. Methodology: Irrigating solutions of 5% phosphoric acid, 15% citric acid, and 2.5% NaOCl, diluted at 0.1% and 0.5%, were applied to cell cultures of 3T3L1 fibroblasts. The cell viability was determined by means of MTT colorimetric assay after a period of 1, 6 and 24 hours. Percentages of cell viability were analyzed using the Kruskal-Wallis test for global comparisons and the Mann-Whitney U-test for pairwise comparisons. Results: The percentage of cell viability diminished progressively over a 24 hour period in all solutions at both dilutions. At 0.1% dilution, 2.5% NaOCl (63.39%) and 15% citric acid (53.91%) showed the highest percentage of cell viability (p=0.083). At 0.5% dilution, 2.5% NaOCl again showed the highest cell viability value (48.51%). Conclusions: The irrigating solution with the highest percentage of cell viability was 2.5% NaOCl at both 0.1% and 0.5% dilutions. A very low percentage of cell viability was obtained with 15% citric acid and 5% phosphoric acid at 0.5% dilution.

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Section: Introductionmentioning

confidence: 99%

Cytotoxic effects of two acid solutions and 2.5% sodium hypochlorite used in endodontic therapy

Navarro-Escobar¹,

González-Rodríguez²,

Ferrer-Luque³

2009

Med Oral

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“…A partial removal of the smear layer within the root canal was achieved with 10% PA, and complete removal was achieved with 32% PA (28). PA in combination with citric acid removed the smear layer and de-mineralized the surfaces of root canal dentin (29). Acid solutions, such as 15% EDTA, 15% citric acid, and 5% PA, used in combination with 2.5% sodium hypochlorite were effective in eliminating the smear layer and root canal debris (30).…”

Section: Discussionmentioning

confidence: 94%

“…However, few studies that compared the effects of various endodontic irrigating solutions on root canal dentin, included PA in their analyses (28)(29)(30)(31). A partial removal of the smear layer within the root canal was achieved with 10% PA, and complete removal was achieved with 32% PA (28).…”

Section: Discussionmentioning

confidence: 99%

Methacrylate Resin Adhesion in Root Canals Conditioned with Phosphoric Acid and Ethylenediaminetetraacetic Acid

Fiore¹,

Phebus²,

Himel³

et al. 2017

Eur Endod J

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Objective: The purpose of this study was to determine the ability of a methacrylate resin dentin bonding agent to adhere to the dentin surfaces of prepared and conditioned root canals with either 32% phosphoric acid (PA) or 17% ethylenediaminetetraacetic acid (EDTA). Methods: Prior to the application of the methacrylate resin, the root canals of 54 intact, caries-free, single-rooted, de-crowned, extracted human maxillary incisor and canine teeth were endodontically prepared and conditioned with either 32% PA or 17% EDTA or with distilled water as the unconditioned control. The resin-treated roots were cross-sectioned at three levels and scanning electron microscope (SEM) imaged for circumferential views of the root canals at 60-90× magnification and site-specific views at 250× magnification, and then randomly coded for independent and blind evaluation by four calibrated examiners. The circumferential surface of the root canals that showed no resin adhesion were digitally measured and subtracted from the digitally measured total root canal circumference, and resin adhesion was expressed as a percentage of the circumference. Results: The mean percentages of resin adhesion were 97% for the PA group, 94% for the EDTA group, and 76% for the control group. There were statistically significant differences among the PA, EDTA, and control groups. Conclusion: Root canals conditioned with 32% PA or 17% EDTA had more resin adhesion than unconditioned root canals. Root canals conditioned with 32% PA had more resin adhesion than those conditioned with 17% EDTA.

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“…Foram utilizadas pontas carbide ou diamantada, porque a qualidade, a quantidade da smear layer e a rugosidade da superfície dentinária estão diretamente relacionadas à esta variável (SEKIMOTO et al, 1999). Ao se empregar pontas carbide, a superfície dentinária torna-se mais lisa e regular e a espessura da smear layer é delgada, o que facilita a sua remoção (AYAD, 2001;OLIVEIRA et al, 2003;BARROS et al, 2005). Com as pontas diamantadas, o corte da superfície dentinária torna-se grosseiro e fragmentado e a dentina apresenta-se coberta por uma camada de smear layer mais espessa e irregular, com sulcos perpendiculares que acompanham a direção do instrumento cortante (EICK et al, 1970;AYAD, 2001;BARROS et al, 2005).…”

Section: Resultsunclassified

“…Assim, se faz necessário um tratamento para esta estrutura, onde se pode removê-la, deixá-la intacta ou modificá-la (RIBEIRO; MONNERAT, 2001). A formação da smear layer está diretamente relacionada com o tipo de instrumento cortante rotatório (carbide ou diamantado), utilizado durante o preparo cavitário, sobre a dentina (EICK et al, 1970;BARROS et al, 2005), sendo esta afetada pelo pH e pelo tipo de agente condicionador utilizado (AYAD, 2001).…”

Section: Introductionunclassified

Micromorfologia da Interface da União Sistema Restaurador-Dentina Decídua em Função do Sistema Adesivo e do Instrumento Cortante Rotatório

Melo-Silva¹,

Myaki

Melo-Silva³

et al. 2007

Pesq Bras Odontoped Clin Integr

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RESUMOObjetivo: Avaliar, in vitro a micromorfologia da interface da união sistema restaurador-dentina decídua, em função do sistema adesivo e do instrumento cortante rotatório. Método: Foram utilizados 20 segundos molares decíduos divididos aleatoriamente em dois grupos (n=10). No grupo C, foi realizado desgaste, até atingir a dentina, com ponta carbide. No grupo D, foi feito o mesmo desgaste, porém com ponta diamantada. A superfície preparada de cada dente foi dividida ao meio, sendo que em uma metade foi aplicado um sistema adesivo convencional de duas etapas (Single-Bond -3M) e na outra um sistema autocondicionante de etapa única (One Up Bond F -Tokuyama). Todos os dentes foram restaurados com a resina composta híbrida (Filtek Z250 -3M). As amostras foram termocicladas, embutidas em resina, seccionadas para obtenção da interface de união e preparadas para observação ao MEV. Resultados: Os dois sistemas adesivos utilizados foram capazes de formar camada híbrida. O sistema adesivo convencional de duas etapas proporcionou melhor selamento da interface de união, quando comparada ao autocondicionante e o emprego da ponta diamantada com o adesivo autocondicionante, mostrou o pior selamento da interface de união, com os maiores valores de gap. Conclusão: O instrumento cortante rotatório (ponta diamantada) só apresentou influência negativa na qualidade da interface sistema restaurador-dentina decídua quando se empregou sistema adesivo autocondicionante de etapa única. DESCRIPTORS DESCRITORESInstrumentos odontológicos; Adesivos dentinários; Dente decíduo. Purpose:To evaluate, in vitro, the micromorphology of the restorative system-primary dentin interface as a function of the adhesive system and rotary cutting instrument. Method: Twenty primary second molars were randomly assigned to two groups (n=10). In group C, the teeth were ground with a carbide bur until reaching the dentin. In group D, the same procedure was done however using a diamond bur. The prepared surface of each tooth was bisected. In one half, a 2-step total-etch adhesive system (Single-Bond -3M) was applied and in the other half, a 1-step self-etching adhesive system (One Up Bond F -Tokuyama) was applied. All teeth were restored with a hybrid composite resin (Filtek Z250 -3M). The specimens were thermocycled, embedded in resin, sectioned to obtain the adhesive interface and prepared for SEM analysis. Results: Both adhesive systems were capable of forming a hybrid layer. The 2-step total-etch adhesive system provided a better sealing of the adhesive interface, in comparison to the self-etching adhesive system. The use of a diamond bur together with the selfetching adhesive system yielded the worst sealing of the adhesive interface, with presence of larger gaps. Conclusions: The rotary cutting instrument (diamond bur) had a negative influence on the quality of the restorative system-primary dentin interface only when a 1-step self-etching adhesive system was used.Dental instruments; Adhesive system; Deciduous tooth.

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Effects of rotary instrumentation and different etchants on removal of smear layer on human dentin

Cited by 38 publications

References 19 publications

Cytotoxic effects of two acid solutions and 2.5% sodium hypochlorite used in endodontic therapy

Cytotoxic effects of two acid solutions and 2.5% sodium hypochlorite used in endodontic therapy

Methacrylate Resin Adhesion in Root Canals Conditioned with Phosphoric Acid and Ethylenediaminetetraacetic Acid

Micromorfologia da Interface da União Sistema Restaurador-Dentina Decídua em Função do Sistema Adesivo e do Instrumento Cortante Rotatório

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