Abstract
This work presents a proposal to assess the abrasive wear of composite resins available in the national market, which are materials largely used in dental clinics for functional and aesthetic tooth restorations. This was achieved by utilizing an experimental set-up on which a dynamic disc covered with proper porcelain (representing hardness close to the human teeth) wears a static disc covered with the resin tested under a constant and pre-determined load. Thus, by means of this set-up and keeping a behavioral status needed to the calculus for all tests, the aggressiveness (referred as to letter k) for all tests was analyzed. Due to the fact that resin characteristic revels how weary the material has become to the abrasion process with other harder material, the strength to wear for such resins was observed. Therefore, a real classification for these materials with their strength to the abrasion wear was made, which is a very important factor in the influence on their lifetime in dental restorations. The classification in descending order for those resins is presented as following: HELIOMOLAR RO, DURAFILL, FILTEK A110, HELIO FILL, POINT 4, FLOW IT; NATURAL FLOW, SUPRAFILL, FILTEK P60, FILTEK Z250, TETRIC FLOW, REVOLUTION, PRODIGY, TETRIC CERAM, HERCULITE, FILLMAGIC, TPH, CHARISMA, Z100.
Highlights
Eduardo Carlos Bianchia, Paulo Roberto de Aguiara, Márcio Rodrigo Poggia, Manoel Henrique Salgadoa, César Antunes de Freitasa, Ana Rita Rodrigues Bianchib aDepto de Eng
This work presents a proposal to assess the abrasive wear of composite resins available in the national market, which are materials largely used in dental clinics for functional and aesthetic tooth restorations
This was achieved by utilizing an experimental set-up on which a dynamic disc covered with proper porcelain wears a static disc covered with the resin tested under a constant and pre-determined load. By means of this setup and keeping a behavioral status needed to the calculus for all tests, the aggressiveness for all tests was analyzed
Summary
O homem está sempre em busca de melhores condições de vida, por isso desenvolve materiais capazes de reparar algumas imperfeições naturais e/ou acidentais. Outro método que foi bastante utilizado, e que também é comentado por Dickson (1979), é o método da escova de dentes desenvolvido por Phillips et al (1971), no qual utilizou uma escova de dentes mecânica para analisar o desgaste abrasivo de dois materiais utilizados em restaurações dentárias, e que já haviam sido analisados clinicamente, concluindo que tal tipo de ensaio pode analisar a resistência à abrasão causada pela escovação, mas não fornece resultados satisfatórios quanto ao desgaste oclusal. Wassell et al (1994) afirmaram que o desgaste dos materiais restauradores é um fenômeno complexo que envolve componentes abrasivos, adesivos, de fadiga e de corrosão; além disso, apontaram que uma importante dificuldade nos testes do tipo dois-corpos era que, se o esmalte fosse usado como o agente de abrasão, suas características variavam de um espécime para outro. Justifica-se assim a necessidade do desenvolvimento de um padrão laboratorial confiável, que forneça os resultados almejados em curto período de tempo
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