ABSTRACT
Objetivo: Avaliar a erosão dentinária após a irrigação com hipoclorito de sódio (NaOCl) em diferentes concentrações por meio de microscopia eletrônica de varredura (MEV). Material e método: Foram utilizados doze dentes humanos unirradiculares divididos em 4 grupos (n=3) conforme solução utilizada: NaOCl 1%, NaOCl 2,5%, NaOCl 5,0% e água destilada (controle). Todos os canais radiculares foram preparados utilizando o sistema BioRace, irrigados com a solução do grupo correspondente e EDTA 17%. Ranhuras longitudinais foram preparadas para clivar as raízes. Os espécimes foram avaliados em MEV. A erosão dentinária foi analisada e registrada considerando os seguintes scores: Score 1 - não houve erosão na dentina; score 2 - erosão moderada e score 3 - erosão severa. Resultado: Praticamente não observou-se erosão (score 1) no grupo preparado com água destilada, em contrapartida, o grupo de dentes que foram irrigados com NaOCl 5%, obteve a maior prevalência de erosão severa (score 3). No grupo irrigado com NaOCl 1% houve prevalência de score 1 no terço cervical e de score 2 no terço médio, já no terço apical os 3 scores foram observados. No grupo irrigado com a solução de hipoclorito de sódio a 2,5% houve erosão dentinária predominantemente moderada (score 2) em todos os terços. Conclusão: A erosão dentinária foi diretamente proporcional à concentração de hipoclorito de sódio.
Objective: To evaluate the dentin erosion after sodium hypochlorite irrigation in different concentrations by scanning electron microscopy (SEM). Methods: It was used twelve singlerooted teeth divided into 4 groups (n = 3) according to the used solution: 1% NaOCl, 2.5% NaOCl, 5% NaOCl and distilled water (control). All root canals were prepared using BioRace system, irrigated with the solution of the corresponding group and 17% EDTA. Longitudinal grooves were made to cleave the roots. The specimens were evaluated in scanning electron microscopy. The dentin erosion level was recorded considering the following criteria: Score 1 - there was no erosion on dentin; score 2 - moderate erosion and score 3 - Severe erosion. Result: The dentin erosion was proportional to the concentration of sodium hypochlorite. Practically, there was no erosion (score 1) in the group prepared with distilled water, on the other hand, the group irrigated with 5% NaOCl had the highest percentage of severe erosion, score 3. The group irrigated with 1% NaOCl had the prevalence of score 1 in cervical third and score 2 in the middle third, however all the scores were observed in apical third. In group irrigated with 2,5% sodium hypochlorite there was, predominantly, moderate dentin erosion (score 2) in all thirds. Conclusion: Dentin erosion was directly proportional to the concentration of sodium hypochlorite
ABSTRACT
OBJECTIVE: To evaluate the effect of instrumentation techniques, irrigant solutions and specimen aging on fiberglass posts bond strength to intraradicular dentine. MATERIALS AND METHODS: A total of 120 bovine teeth were prepared and randomized into control and experimental groups resulting from three study factors (instrumentation techniques, irrigant solutions, specimen aging). Posts were cemented with RelyX U100. Samples were submitted to push-out test and failure mode was evaluated under a confocal microscope. RESULTS: In specimens submitted to water artificial aging, nickel-titanium rotary instruments group presented higher bond strength values in apical third irrigated with NaOCl or chlorhexi-dine. Irrigation with NaOCl resulted in higher bond strength than ozonated water. Artificial aging resulted in significant bond strength increase. Adhesive cement-dentin failure was prevalent in all the groups. CONCLUSION: Root canal preparation with NiTi instruments associated with NaOCl irrigation and ethylenediaminetetra acetic acid (EDTA) increased bond strength of fiberglass posts cemented with self-adhesive resin cement to intraradicular dentine. Water artificial aging significantly increased post-Clinical significance: The understanding of factors that may influence the optimal bond between post-cement and cement-dentin are essential to the success of endodontically treated tooth restoration.
Subject(s)
Dental Bonding , Dental Materials/chemistry , Dental Pulp Cavity/ultrastructure , Dentin/ultrastructure , Glass/chemistry , Post and Core Technique/instrumentation , Root Canal Irrigants/therapeutic use , Root Canal Preparation/instrumentation , Animals , Cattle , Cementation/methods , Chlorhexidine/therapeutic use , Dental Alloys/chemistry , Dental Pulp Cavity/drug effects , Dentin/drug effects , Edetic Acid/therapeutic use , Materials Testing , Nickel/chemistry , Ozone/therapeutic use , Random Allocation , Resin Cements/chemistry , Root Canal Preparation/methods , Sodium Hypochlorite/therapeutic use , Stainless Steel/chemistry , Stress, Mechanical , Surface Properties , Time Factors , Titanium/chemistry , Water/chemistryABSTRACT
A Terapia Periodontal de Suporte (TSP) denota a necessidade básica dos procedimentos terapêuticos para que os pacientes, por meio de esforços próprios, possam controlar a infecção periodontal, sendo considerada abordagem que está diretamente relacionada com o sucesso da terapia periodontal como um todo. Inúmeras experiências clínicas sobre os efeitos em longo prazo do tratamento de periodontite têm demonstrado que manutenção profissional cuidadosa pós-terapêutica é parte integrante do tratamento periodontal, constituindo o único meio de garantir a manutenção por longo período dos efeitos benéficos da terapia. Assim, o objetivo desse artigo é revisar alguns aspectos relacionados à TSP, incluindo filosofia e periodicidade do tratamento, índices para controle periodontal, abordagem profissional, recursos e técnicas disponíveis bem como o processo de reavaliação de pacientes. A avaliação desses tópicos permite afirmar que a TSP é pré-requisito indiscutível para garantir resultados benéficos dos tratamentos com manutenção dos níveis de inserção clínica por longos períodos de tempo, mesmo que abordagens em relação à avaliação contínua do risco nos níveis do paciente, dos dentes e dos sítios dos dentes representem desafio para o conceito da TSP.
Supportive Periodontal Therapy (SPT) denotes the basic need of therapeutic procedures in order patients can control periodontal infection through their own efforts, considering the approach that is directly related to the success of the periodontal therapy as a whole. Several clinical experiences on long-term effects of periodontitis treatments have shown that a careful professional post-therapeutic maintenance therapy is part of the periodontal treatment, consisting in the only means of assuring the maintenance of the therapy beneficial effects in long term. This paper aims to review a few aspects related to SPT, including philosophy and frequency of treatment, periodontal control indexes, professional approach, available resources and techniques, as well as the process of reassessing patients. The analysis of those topics allows us to state that SPT is an undeniable prerequisite to ensure beneficial outcomes of periodontal treatment with maintenance of clinical attachment levels for long periods, even though approaches to continuous assessment of the patient?s risk levels, teeth and tooth sites pose a challenge to SPT concept.
