Biomedical subjects

Sylvio Monteiro Júnior

Publications and source records attributed to Sylvio Monteiro Júnior.

5 recordsLinked to original sources

PubMed2004

Effect of different ceramic surface treatments on resin microtensile bond strength.

PURPOSE: The objective of this study was to evaluate the effect of different surface treatments on the microtensile bond strength (micro-tbs) of composite bonded to hot-pressed ceramic. The null hypothesis tested was that neither of the surface treatments (silanization or fluoric acid etching) would produce greater bond strength of composite resin to the ceramic. MATERIALS AND METHODS: Four 7 x 7 x 5 mm hot-pressed ceramic blocks of IPS Empress 2 were fabricated and polished to 600 grit followed by sandblasting with 50 microm alumina. The ceramic blocks were then divided into four groups and submitted to the following surface treatments: Group 1: 9.5% hydrofluoric (HF) acid for 20 seconds and silane (S) for 3 minutes; Group 2: silane for 3 minutes; Group 3: 9.5% HF acid for 20 seconds; Group 4: no treatment. Scotchbond adhesive was applied to the treated ceramic surfaces and covered with Filtek Z250 composite resin. The composite-ceramic blocks were cut with an Isomet low speed diamond saw machine producing sticks (n = 25), which were loaded to failure under tension in an Instron Universal testing machine. The mean micro-tbs was analyzed with one-way ANOVA and Bonferroni "t" test. RESULTS: All specimens of Group 4 experienced adhesive failure during the cutting of the block and were eliminated. The mean micro-tbs and standard deviations (SD) in megaPascals were: Group 1 = 56.8 (+/-10.4), Group 2 = 44.8 (+/-11.6), Group 3 = 35.1 (+/-7.7). Statistical analysis showed that the bond strength was significantly affected by surface treatment (p < 0.0001). Group 1 (HF + S) had the highest micro-tbs, and Group 2 (S) had higher micro-tbs than Group 3 (HF). The mode of fracture of the specimens was examined using scanning electron microscopy (SEM), and all fractures occurred within the adhesion zone. CONCLUSION: The results show that surface treatment is important for resin adhesion to ceramic and suggestthat silane treatment was the main factor responsible for resin bonding to ceramic.

Acid Etching, Dental↗

PubMed2003

Direct adhesive restoration of anterior teeth. Part 1. Fundamentals of excellence.

Contemporary composite resin materials have significantly evolved, facilitating the delivery of aesthetic and functional restorations. The predictability of this treatment modality has been significantly improved by the introduction of adhesive protocols. This three-part series proposes a simplified protocol and the fundamentals for minimally invasive, aesthetic, direct adhesive restorations of anterior teeth. The first part of this series offers an overview of the state-of-the-art relating to composite restorations, both in situations deemed to be relatively uncomplicated and those that are more challenging.

Adhesives↗

PubMed2003

Direct adhesive restoration of anterior teeth: Part 3. Procedural considerations.

Direct composite restorations represent a minimally invasive, aesthetic treatment option. The development of contemporary bonding procedures has allowed for improved aesthetics and restorative success. Incorporation of predictable adhesive protocols will increase the restoration's longevity and durability. This article presents the restorative procedures, adhesive protocol, and insertion considerations that must be addressed when using resin bonded options.

Acid Etching, Dental↗

PubMed2002

Diagnosis and management of maxillary incisors affected by incisal wear: an interdisciplinary case report.

UNLABELLED: In the attempt to restore anterior teeth affected by erosion and bruxism, many clinicians have been frustrated with the constant restorative failures. Frequently, these failures are attributed to the restorative materials employed, especially in cases in which composite resins are used. However, some flaws of the restorations are related to the oversight of occlusal principles. The purpose of this article is to discuss the etiology, signs, and symptoms of incisal wear, with special attention to that caused by bruxism and chemical erosion. Relatively simple management techniques (e.g., occlusal adjustment, adhesive restorations) are proposed, and the diagnosis and management of a representative clinical case is presented. CLINICAL SIGNIFICANCE: In some cases of bruxism and/or dental erosion, it is possible to acquire space to recuperate the esthetics and function of maxillary incisors affected by incisal wear through a conservative treatment associated with the control of the etiologic factors.

Adult↗

PubMedDate not supplied

Reestablishing biologic width with forced eruption.

Maintenance of gingival health is one of the keys for the longevity of teeth, as well as for the longevity of restorations. In this context, the biologic width functions as a barrier against the entrance of microorganisms into the internal medium of the periodontal ligament and into the gingival and osseous connective tissue. This clinical case describes a technique to reestablish the biologic width of a central incisor using forced extrusion and done without post-treatment corrective surgery.

Adult↗