Effects of methods of hydration of a biphasic ceramic graft on bone regeneration of extraction socket defects.

BACKGROUND: Alveolar volumetric changes are inherent to the healing process after tooth extraction and filling of the extraction site with biomaterials can reduce these volumetric changes and provide a more favorable environment for the future prosthetic restoration with implants. Among the biomaterials available, biphasic ceramic compounds have shown promissing clinical results, however, histologic evaluation of bone tissue response to different hydration and incorporation methods are limited. The objective of this study was to comparatively evaluate in vivo the osteoconductive potential of the biphasic ceramic bone substitute (SBC) composed of beta-tricalcium phosphate and hydroxyapatite after different hydration methodologies in rat extraction sockets. METHODS: Wistar rats (n = 20) were randomly distributed in two subgroups (G1, G2) according to the hydration methods used. After extraction of the right upper central incisor the alveoli were filled with SBC hydrated by two different methods. Group 1: biomaterial hydrated in blood; Group 2: biomaterial hydrated in physiologic saline. The animals were euthanized after 1 and 6 weeks for removal of the bone blocks containing the biomaterial and were submitted to histologic processing. Five-µm-thick demineralized sections of the samples were stained with hematoxylin and eosin (HE) and subjected to histomorphometric analysis. RESULTS: Bone formation was limited 7 days after the extraction procedure and increased in both groups between 7 and 42 days from surgery, demonstrating a time dependent increase of bone volume throughtout the experimental period (p < 0.05). CONCLUSIONS: The hydration of SBC with saline significantly increased new bone formation and reduced connective tissue volume after 42 days demonstrating that hydration method may significantly influence bone healing in such defects, and, thus should be carefully performed.

Solução conservadora em casos de fluorose severa: relato de caso clínico / Conservative solution in cases of severe fluorosis: clinical case report

A fluorose dental manifesta-se clinicamente como manchas brancas em dentes homólogos que foram previamente expostos a altas concentrações de flúor sistêmico durante a amelogênese dentária. O grau de manchamento dentário pode variar de leve a severo, podendo levar a grande interferência estética. Por essa razão, tem sido cada vez mais comum a procura por tratamentos odontológicos conservadores capazes de minimizar tais interferências, preservando ao máximo a estrutura dentária. O objetivo deste artigo e relatar o caso de uma paciente do sexo feminino, 24 anos, com manchas severas por fluorose, que teve sua estética dental restaurada de maneira conservadora, associando-se o clareamento dental e microabrasão do esmalte, para se obter resultado estético satisfatório.

Dental fluorosis is expressed clinically as white spots in homologous teeth previously exposed to high concentrations of systemic fluoride during tooth amelogenesis. The degree of tooth staining can vary from mild to severe and may lead to significant esthetic changes. For this reason, conservative dental treatments have been increasingly demanded to minimize defects, preserving as much tooth structure as possible. The aim of this study was to report the case of a female, 24 year-old patient with severe fluorosis staining, restored conservatively through the associating of dental bleaching and enamel microabrasion, with a satisfactory esthetic result.

Restauração de dente posterior com resina à base de silorano utilizando-se matriz oclusal / Restoration of posterior tooth using silorane-based composite resin with the aid of an occlusal matrix

O avanço de novas tecnologias contribui para o desenvolvimento de materiais restauradores recentemente introduzidos no mercado odontológico, dentre eles, a resina composta à base de silorano. Essa resina composta apresenta matriz orgânica derivada de duas moléculas constituintes: siloxanos e oxiranos. Essa combinação oferece biocompatibilidade, hidrofobia e baixa contração de polimerização. O propósito deste trabalho é descrever um caso clínico com o uso da resina composta Filtek P90 (3M ESPE, EUA) em uma cavidade de classe I no elemento 36, com restauração em amálgama de prata deficiente, utilizando-se matriz em resina acrílica para mimetizar a anatomia oclusal com previsibilidade e segurança. Sendo assim, o procedimento restaurador obteve resultado satisfatório, a partir da remoção da restauração deficiente e utilizando-se o protocolo restaurador de acordo com as recomendações do fabricante.

Advancement of new technologies have contributed to the development of new dental restorative materials, including silorane-based composite resins. This innovative composite presents an organic matrix derived from two molecules: oxiranes and siloxanes. This combination offers biocompatibility, hydrophobicity and low polymerization shrinkage. The purpose of this paper is to describe a clinical case using a composite resin (Filtek P90, 3M ESPE, EUA) in a Class I cavity of tooth #36 with a defective amalgam restoration, using an acrylic resin matrix for faithful reproduction of the occlusal anatomy with predictability and safety. Thus, the restorative procedure was carried out with a satisfactory result, starting from the removal of the defective restoration and the use of a restorative protocol according to the manufacturer’s recommendations.