Bone Volume Changes After Sinus Floor Augmentation with Heterogenous Graft.

PURPOSE: The aim of this study was to evaluate the volumetric stability of deproteinized bovine bone after sinus augmentation, using cone beam computed tomography (CBCT) and three-dimensional (3D) analysis. MATERIALS AND METHODS: Using a specific selection tool and 3D reconstruction from InVesalius 3.0, volumetric analysis of CBCT scans was performed in patients undergoing a sinus elevation technique in critical defects, using deproteinized bovine bone. The first scan was performed immediately after graft surgery (T1), and the second was performed 8 months after graft surgery (T2). RESULTS: A total of 13 patients met the inclusion criteria of this retrospective study; 26 postoperative CBCT scans were analyzed for these patients. All patients exhibited an increase in bone volume (9.10%). The mean bone volume increase from T1 to T2 was 0.137 cm(3) (SD: ± 0.104 cm(3)). There was a statistically significant correlation between bone volume and time (P < .0001). The mean bone volume was 1.506 cm(3) (SD: ± 0.473 cm(3)) for T1 and 1.644 cm(3) (SD: ± 0.506 cm(3)) for T2. CONCLUSION: Within the limited sample, the study demonstrated an increase in graft volume after sinus elevation with deproteinized bovine bone in critical defects.

Peri-implantite (Parte I): etiologia, características e diagnóstico / Peri-implantitis: causes, characteristics and diagnosis

A peri-implantite é uma infecção dos tecidos ao redor do implante que resulta na perda do osso de suporte. Alguns fatores locais e sistêmicos influenciam na evolução desta doença e seu tratamento pode ser cirúrgico ou não. O objetivo desta revisão bibliográfica foi orientar os profissionais a diagnosticar as doenças peri-implantares, conhecer suas características e avaliar os fatores de risco. O estudo bibliográfico foi realizado utilizando os bancos de dados Medline e Ebsco, no qual o período de referência foi entre 1992 e 2013. A pesquisa foi limitada a artigos completos publicados no idioma inglês. Todos os níveis de evidência foram incluídos, tais como relato de caso, experimentos em animais, revisões bibliográficas e estudos estatísticos com humanos. De acordo com a revisão bibliográfica o principal agente etiológico das doenças peri- implantares ainda é a placa bacteriana, no entanto, fatores de risco sistêmicos e locais influenciam no seu desenvolvimento. Os principais microrganismos presentes nas infecções peri-implantares são os mesmos encontrados na periodontite, ou seja, bactérias gram e anaeróbios. Contudo, nenhuma definição evidente da microbiota associada com a peri-implantite foi estabelecida até o momento, dificultando um diagnóstico mais preciso e a determinação do protocolo de tratamento. O tratamento não cirúrgico isoladamente não apresentou resultados satisfatórios, no entanto, quando combinado com antibiótico oral ou antisséptico reduziu a infecção peri-implantar. O tratamento cirúrgico permite o debridamento exato da área contaminada peri-implantar do implante, o que resulta em ganho de inserção clínica e reconstrução óssea. Até a presente data, nenhum protocolo de tratamento padrão foi definido para peri-implantite.

Peri-implantitis is an infection of the tissues around the dental implant resulting in loss of supporting bone. Many local and systemic factors influence the development of the disease and its treatment can be surgical or non-surgical. The purpose of this literature review is to guide professionals to diagnose peri-implant diseases, knowing their characteristics, assess to risk factors and choosing appropriate treatments for each situation. The literature search was performed using Medline and Ebsco database and the period between 1992 and 2013. The search was limited to full-text articles published in English. All levels of evidence were included such as case report, animal experiments, literature reviews and statistical studies with humans. According to literature review the main etiological agent of peri-implant diseases still is the plaque, however, systemic and local risk factors influence its development. The main present microorganisms in the periimplant infection are the same found in periodontitis such as Gram- and anaerobic bacteria. However, no clear definition of the microbiota associated with the peri-implantitis has been established yet, making a more accurate diagnosis and determination of the treatment protocol. The non-surgical treatment alone did not show satisfactory results, however, when combined with oral antibiotic or antiseptic reduces peri-implant infection. Surgical treatment allows accurate debridement of the peri-implant area, decontamination of the implant surface and results in gain of clinical attachment and bone reconstruction. To date, no standard treatment protocol of peri-implantitis.

Effects of a 10% carbamide peroxide bleaching agent on rat oral epithelium proliferation.

The purpose of the present study was to evaluate the influence of short course topical application of carbamide peroxide on proliferating cell nuclear antigen (PCNA) immunohistochemical expression in the oral tongue mucosa of rats. Twelve male Wistar rats were submitted to topical application of 10% carbamide peroxide on one side of the dorsal tongue once a week for three consecutive weeks. Only distilled water was applied on the control side. The animals were killed on days 0, 10, and 20 after the last application. The tongue was fixed in buffered formalin for 24 h and embedded in paraffin. Tissue blocks (3 microns) were subjected to the biotin-streptavidin amplified system for identification of PCNA. The percentage of epithelial-positive basal cells in each side of the tongue mucosa was calculated. The results demonstrated that topical application of 10% carbamide peroxide increases PCNA immunohistochemical expression on the basal layer of the oral mucosa epithelium of rats on day 0 after treatment. In conclusion, short-course use of carbamide peroxide induces transient epithelial cell proliferation of the oral mucosa of rats.

Effects of a 10 percent carbamide peroxide bleaching agent on rat oral epithelium proliferation

The purpose of the present study was to evaluate the influence of short course topical application of carbamide peroxide on proliferating cell nuclear antigen (PCNA) immunohistochemical expression in the oral tongue mucosa of rats. Twelve male Wistar rats were submitted to topical application of 10 percent carbamide peroxide on one side of the dorsal tongue once a week for three consecutive weeks. Only distilled water was applied on the control side. The animals were killed on days 0, 10, and 20 after the last application. The tongue was fixed in buffered formalin for 24 h and embedded in paraffin. Tissue blocks (3 æm) were subjected to the biotin-streptavidin amplified system for identification of PCNA. The percentage of epithelial-positive basal cells in each side of the tongue mucosa was calculated. The results demonstrated that topical application of 10 percent carbamide peroxide increases PCNA immunohistochemical expression on the basal layer of the oral mucosa epithelium of rats on day 0 after treatment. In conclusion, short-course use of carbamide peroxide induces transient epithelial cell proliferation of the oral mucosa of rats

Oral squamous cell carcinoma: a retrospective study of 740 cases in a Brazilian population / Carcinoma epidermóide de boca: um estudo retrospectivo de 740 casos no Brasil

The purpose of this study was to evaluate, retrospectively, the profile of patients with oral squamous cell carcinoma. They were referred to two hospitals of Belo Horizonte (MG, Brazil) between 1986 and 1996. The medical records of 740 patients presenting oral squamous cell carcinoma were reviewed in detail. The TNM classification and staging, age, gender, race, occupation, and site of the primary tumor were recorded. The male-to-female ratio was 4.8:1. The mean age was 58.6 years. Most of the patients were in their sixties and were farm workers. The tumors were found principally on the tongue. There was a close relationship between some habits (tobacco and alcohol consumption) and the development of oral squamous cell carcinoma. Most of the patients sought medical care in the first year, even though almost half of them had lesions in stage T4. The identification of the characteristics of this specific population might reflect either accomplishments or problems in oral cancer control and can enable the development of a primary prevention program for oral squamous cell carcinoma.

Avaliação clínica de cinco anos de uma restauração de amálgama associada a um sistema adesivo / Five-years clinical evaluation of amalgam restorations associated an adhesive system

Após revisão da literatura sobre restaurações com amálgamas odontológicos associadas a sistemas adesivos, os autores relatam uma avaliação clínica de cinco anos de uma restauração extensa com amálgama utilizando adesivos de última geração. Os objetivos são mostrar alternativas de tratamentos restauradores nos elementos dentários associadas a aplicação de sistemas adesivos como opção a retenções adicionais, bem como suas vantagens, desvantagens, indicações e contra-indicações

Microabrasão do esmalte dental para remoção de manchas por fluorose / Enamel microabrasion for removal of fluorosis stains

Os autores aplicam uma técnica de remoção de manchas por fluorose, utilizando o sistema Prema Compound (Premier Dental Products) em um jovem de 12 anos de idade. A técnica mostrou-se prática, rápida e eficaz; e os resultados mostram-se satisfatórios, evidenciando acentuada melhora estética

Pinos intra-radiculares de fibras de carbono em restauraçöes de dentes tratados endodonticamente / Use of carbon fiber posts in the restoration of endodontically treated teeth

Dentes tratados endodonticamente säo normalmente frágeis, necessitando de um reforço ao serem restaurados. Núcleos metálicos fundidos e pinos intra-radiculares metálicos, usados há muitos anos na restauraçäo desses dentes, näo reforçam a estrutura dental e podem levar a fraturas radiculares. Recentemente, pinos intra-radiculares de fibras de carbono vêm sendo introduzidos no mercado, apresentando várias vantagens: adesäo à estrutura dental e ao material de preenchimento, módulo de elasticidade próximo ao do dente natural, resistência à corrosäo, facilidade de remoçäo com brocas e solventes e o fato de permitirem um preparo mais conservador do dente