Influence of Sandblasting and Chemical Etching on Titanium 99.2–Dental Porcelain Bond Strength

The metal–ceramic interface requires proper surface preparation of both metal and ceramic substrates. This process is complicated by the differences in chemical bonds and physicochemical properties that characterise the two materials. However, adequate bond strength at the interface and phase composition of the titanium-bioceramics system is essential for the durability of dental implants and improving the substrates’ functional properties. In this paper, the authors present the results of a study determining the effect of mechanical and chemical surface treatment (sandblasting and etching) on the strength and quality of the titanium-low-fusing dental porcelain bond. To evaluate the strength of the metal-ceramic interface, the authors performed mechanical tests (three-point bending) according to EN ISO 9693 standard, microscopic observations (SEM-EDS), and Raman spectroscopy studies. The results showed that depending on the chemical etching medium used, different bond strength values and failure mechanisms of the metal-ceramic system were observed. The analyzed samples met the requirements of EN ISO 9693 for metal-ceramic systems and received strength values above 25 MPa. Higher joint strength was obtained for the samples after sandblasting and chemical etching compared to the samples subjected only to sandblasting.

Improving the Properties of Dental Porcelain Luminescence Using Silicon Carbide

An ideal dental restorative should have the same light reflection, diffusion, and fluorescence properties as a natural tooth. Natural teeth always emit intense blue fluorescence under ultraviolet light, making the teeth look whiter and brighter in daylight. One of the limitations in trying to simulate restorative materials is the unique structure of natural teeth. This study aimed to simulate dental tubules and investigate the effect of different porosity percentages on dental porcelain luminescence properties. In this laboratory study, a control sample (without silicon carbide) and three dental porcelain samples with different percentages of porosity were prepared by adding 1, 2, 3% silicon carbide luminescence intensity was examined by spectrophotometer and compared with natural teeth. An increase in luminescence properties was observed with increasing porosity. The highest light intensity was observed in the sample’s porosity with 3% silicon carbide. The lowest intensity was observed in the porosity of the sample with 1%. Creating porosity in dental porcelain reduces refraction, collision, and light reflection. Therefore such specimens will be brighter and more transparent when exposed to ultraviolet light.

Reabilitação de dentes posteriores pela técnica Endocrown: Revisão de Literatura / Rehabilitation of posterior teeth with Endocrown technique: Literature review

Resumo: Endocrown é uma técnica moderna que prima por trazer maior qualidade nos tratamentos protéticos da área Odontológica, almejando restaurações indiretas adesivas em dentes tratados endodônticamente, proporcionando uma longevidade funcional maior e melhor resultado estético ao paciente. O objetivo da presente revisão de literatura foi analisar estudos que trazem os conceitos e aplicações clínicas da “endocrown”. A busca bibliográfica foi realizada nas bases de dados Scielo, Pubmed e Lilacs, e englobou estudos datados de 2010 a 2020. Através deste trabalho, nota-se que esta técnica é bastante eficiente por sua viabilidade e sucesso clínico, e se faz importante fomentar novos trabalhos para estudo e discussão deste tema, para que esta técnica torne-se de maior conhecimento dos cirurgiões-dentistas. Abstract: Endocrown is a modern technique that seeks higher quality in prosthetic treatments, with indirect adhesive restorations in endodontically treated teeth, providing greater functional longevity and better aesthetic results. The purpose of this literature review was to analyze studies that shows concepts and clinical applications of “endocrown”. The bibliographic research was made in Scielo, Pubmed and Lilacs databases, that included studies dating from 2010 to 2020. Through this work, it is noted that this technique is quite efficient due to its viability and clinical success, being important to promote new studies and discussion of this topic to this technique becomes more known by dentists. Keywords: Dental Prosthesis, Intracoronary Restorations, Retention in Dental Prosthesis, Dental Porcelain. Introdução Restaurar dentes tratados endodonticamente engloba muitas premissas, e por isso encontra-se entre os maiores desafios para os Cirurgiões-Dentistas, necessitando de conhecimento interdisciplinar para realizar o melhor tratamento (PORTO et al., 2016).

Effect of Atmospheric Pressure Plasma Treatment on Shear Bond Strength Between Zirconia and Dental Porcelain Veneer

Various surface treatments on zirconia have been reported for dental porcelain veneer. However, it has not been determined which of these treatments provide the highest bond strength. The purpose of this study is to compare the effect of airborne particle abrasion and atmospheric pressure plasma treatment on the shear bond strength between zirconia and dental porcelain veneer. The groups were divided into four groups according to the surface treatment method: the control group, the atmospheric pressure plasma treated group (group P), the airborne particle abrasion group (group A), the atmospheric pressure plasma treated group after the airborne particle abrasion (group AP). Atmospheric pressure plasma was applied on the specimens using a plasma generator (Plasma JET, POLYBIOTECH Co. Ltd., Gwangju, Korea) and airborne-particle abraded with 110 µm. The characteristics of surface treated zirconia were analyzed by 3D-OP, XRD, XPS and contact angle. The shear bond strength was tested using a universal testing machine. The shear bond strength of group P was significantly increased compared to that of the control group (P < 0.05). The shear bond strength of group AP was significantly increased as compared to group A (P < 0.05). There was no significant difference between the group P and group A (P > 0.05). As a result of this study, the atmospheric pressure plasma treatment showed significantly higher shear bond strength than control group, but similar to the airborne particle abrasion, and the atmospheric pressure plasma treatment after the airborne particle abrasion provided the highest shear bond strength. This study demonstrated that application atmospheric pressure plasma treatment on zirconia may be useful for increasing bond strength between zirconia and dental porcelain veneer.