Anterior composite restorations: survival rate and main reason for failur

Introdução: Desde a sua introdução, as resinas compostas tornaram-se na primeira escolha para restaurações diretas anteriores. A procura crescente de conhecimento relativamente aos potenciais fatores preponderantes para o fracasso a longo prazo deste tipo de abordagem terapêutica, poderá facilitar as decisões dos Médicos dentistas, e consequentemente reduzir os custos e aumentar a longevidade das restaurações. Objetivos: O objetivo deste estudo é avaliar a taxa de sobrevivência das restaurações diretas anteriores, à base de resinas compostas (RBC), e as principais razões para o seu insucesso. Materiais e Métodos: Pesquisa na base de dados PubMed e seleção dos artigos científicos em inglês, com limitação temporal dos últimos 10 anos, recorrendo às seguintes palavras-chave: Direct Restoration; Composite Resin; Failure OR Survival Evaluation; Clinical Evaluation OR Clinical Performance. Dos 930 artigos encontrados, foram selecionados 10 estudos para fazer parte deste estudo. Discussão: As restaurações compostas diretas anteriores mostraram uma taxa de sobrevivência global variável de 38% a 96,3% AFR, variando de 1,1% a 5%. Para as restaurações Build-up, a taxa de sobrevivência variou de 82,4% a 96,3%, e a taxa de AFR variou de 1,1% a 9,2%. Para restaurações de classe III e IV de 64% com 2,9% de AFR. Para as facetas em compósito, de 38,0% a 80,1%, e a AFR variou de 6,0% a 9,2%. As fraturas foram a principal razão de fracasso, variando entre 62,0% e 73,3%. Conclusão: Para RBC, a presente revisão indica geralmente um bom desempenho clínico a longo prazo, com taxas anuais de insucesso de 1,1% a 5%. %. A causa mais relatada de falha foi a fratura. Alguns fatores, como o tempo necessário para a restauração e a vitalidade clínica do dente, foram apontados como possíveis falhas em restaurações compostas anteriores.Introduction: Since their introduction, composite resins have become the first choice for direct anterior restorations. The increasing demand for knowledge regarding the potential factors preponderant for the long-term failure of this type of therapeutic approach may facilitate dentists' decisions, and consequently reduce costs and increase the longevity of restorations. Objectives: The aim of this study is to evaluate the survival rate of anterior direct resin based composite (RBC), and the main reasons for their failure. Materials and Methods: Search in the PubMed database and selection of scientific articles in English, with a time limitation of the last 10 years, using the following keywords: Direct Restoration; Composite Resin; Failure OR Survival Evaluation; Clinical Evaluation OR Clinical Performance. From the 930 articles found, 10 studies were selected to be part of this study. Discussion: Anterior direct composite restorations showed an overall survival rate varying from 38% to 96.3% AFR, ranging from 1.1% to 5%. For Build-up restorations, the survival rate ranged from 82.4% to 96.3%, and the AFR ranged from 1.1% to 9.2%. For class III and IV restorations of 64% with 2.9% AFR. For composite veneers from 38.0% to 80.1%, and AFR ranged from 6.0% to 9.2%. Fractures were the main reason for failure, ranging from 62.0% to 73.3%. Conclusion: For RBC, the present review generally indicates good long-term clinical performance, with annual failure rates of 1.1% to 5%. %. The most reported cause of failure was fracture. Some factors, such as the time required for restoration and the clinical vitality of the tooth, were pointed out as possible failures in anterior composite restorations

Adsorption Equilibria of Single-Component and Multi-Component Metal Ions on to Scrap Rubber

The ability of scrap rubber to adsorb the three metal ions, copper, cadmium and zinc, in single-component and multi-component mixtures in aqueous solutions has been studied. A comparison has been made between the single-component saturation uptake and the multi-component uptakes. The experimental results were fitted to the Langmuir, Freundlich and Redlich–Peterson isotherms. The correlation coefficients obtained from plotting these isotherms gave a measure of the conformity of the data to a linear trend and corresponded to a perfect fit. The isotherms indicated a competitive uptake, with copper being preferentially adsorbed by scrap rubber in multi-component solutions. The capacity of scrap rubber for the single-component metals was in the order: Cd > Cu > Zn. On the other hand, the order of preference of scrap rubber for metals in multi-component mixtures was: Cu > Cd > Zn

A Study on the Removal of Chromium(VI) from Waste Solutions by Adsorption on to Sawdust in Stirred Vessels

The ability of sawdust to adsorb chromium(VI) from waste solutions has been studied in a batch reactor under forced convection conditions. Variables investigated were the rotational speed of the impeller, the initial concentration of chromium(VI) in solution and the weight and particle diameter of the sawdust. Increasing both the rotational speed of the impeller and the initial concentration of chromium(VI) in solution led to an increase in the volumetric mass transfer coefficient (k) according to the relationships k ∝ ω) 0.71 and k ∝ C 0.26 , where ω is the rotational speed of the impeller (rev./min) and C 0 is the initial concentration of chromium(VI) in solution (mg/dm 3 ). On the other hand, the volumetric mass transfer coefficient was found to decrease with increasing particle diameter of sawdust (d p ) according to the relationship k ∝ d p −0.87 . The removal of chromium(VI) was also found to be significantly dependent on the weight of sawdust. Analysis of the equilibrium isotherm data has been undertaken using the Freundlich and Langmuir equations. The maximum adsorption capacity of sawdust for chromium(VI) was found to be 4.44 mg/g

Are APIs with Poor Design Subject to Poor Lexicon? : A Google Perspective

REST (Representational state transfer) is an architectural style for distributed hypermedia systems. The simplicity of REST allows straightforward communication between HTTP clients and servers using URIs (Uniform Resource Identifiers) and HTTP methods, e.g., GET, POST, PUT, and DELETE. To do the communication effectively between clients and servers, there is a set of best design practices (design and linguistic patterns) shall be followed, and a set of poor design practices (design and linguistic antipatterns) shall be avoided. This study aims to determine whether there is a relationship between design and linguistic quality in Google RESTful APIs. To find this relation, a tool is developed to detect patterns and antipatterns in REST APIs both in terms of design and linguistic quality. The input of this tool is qualitative data (Google APIs) and its output is quantitative data. Using this quantitative data, a statistical study is then performed to detect the relation. The tests that are conducted to obtain the final results are Chi-squared and Phi Coefficient tests. The result of Chi-squared that considered all the groups of patterns and antipatterns shows that there is a statistically significant relation between design and linguistic quality. However, when we assess the individual pair of patterns and antipatterns, our Phi Coefficient tests show that for most of the cases, there is no or negligible relationship between linguistic and design patterns and antipatterns

A confusing cutaneous lymphoma

Blastic plasmacytoid dendritic cell neoplasm previously called CD4+CD56+ haematodermic neoplasm or blastic NK cell lymphoma is a rare and clinically aggressive hematologic malignancy, derived from plasmacytoid dendritic cells. It is characterized by a skin tropism and co-expression of CD4 and CD56. We report the case of a 57 year old man who had lesions papulonulaires back and lower limbs associated with multiple lymph nodes. The diagnosis was made by histological examination and immunohistochemistry

Primary Paratesticular Leiomyosarcoma: A Case Report and Literature Review

Paratesticular soft tissue sarcomas are very rare malignant mesenchymal tumors. With only few cases reported in the literature, data regarding diagnostic and management of these tumors are limited. We reported a case of primary paratesticular leiomyosarcoma in a 72-year-old man complaining of a progressively growing painless right scrotal mass. The patient underwent radical inguinal right orchiectomy and adjuvant 3D conformal radiotherapy to the tumor bed including the surgical scar. The prescription dose was 54 Gy, and no pelvic irradiation was performed. He remained free of recurrence for the last 16 months