AIM: To evaluate the leakage on Er,Cr:YSGG laser- and bur- prepared Class V cavities restored with a silorane-based composite resin using different insertion techniques METHODS: 40 cavities were outlined according to: the type of instrument [Er,Cr:YSGG laser (3.0 W power, energy per pulse of 150 mJ, fluence of 53.57J/cm², pulse duration of 140-200 ∝s, 20 Hz repetition rate and 55/65% air/water spray) or diamond bur]; and the type of filling technique (bulk increment or incremental). Four experimental groups were obtained (n=10): G1- diamond bur (DB) and incremental (I); G2- DB and bulk increment (BI); G3- Er,Cr:YSGG and I; and G4- Er,Cr:YSGG and BI. Specimens were restored with a silorane-based composite resin (Filtek P90, 3M/ESPE), subjected to 500 thermal cycles, sealed, infiltrated with 2% (w/v) methylene blue and sectioned in halves. Specimen analysis was scored based on a scale. Statistical analyses were done using the Kruskal-Wallis and Student Newman-Keuls tests (α=0.05). RESULTS: Statistically significant differences were observed between G2 and G4 (p=0.003) and between G1 and G2 (p=0.028). The filling technique did not influence the pattern of dye leakage in the cavity walls (p=0.151). CONCLUSIONS: Less leakage was observed when Er,Cr:YSGG cavities were restored with silorane-based composite resin, using the bulk increment technique. Nevertheless, cavities done using diamond bur have less leakage only when incrementally restored.

Um Banco de Dentes Humanos (BDH) é uma instituição sem fins lucrativos, vinculada a uma faculdade, universidade ou outra instituição. Seu propósito é suprir as necessidades acadêmicas, fornecendo dentes humanos para pesquisa ou para treinamento laboratorial pré-clínico dos alunos, dessa forma eliminando o comércio ilegal de dentes que ainda existe nas faculdades de Odontologia. Cabe também ao BDH zelar pela eliminação da infecção cruzada que existe no manuseio indiscriminado de dentes extraídos. Para o bom funcionamento de um BDH, é fundamental um controle severo de seus procedimentos internos, que incluem a separação e o estoque de dentes, assim como o cadastro e o arquivamento das fichas dos doadores ou beneficiários. Aqui, abordaremos as funções que um BDH pode desempenhar e a forma pela qual hoje o Banco de Dentes Humanos da Faculdade de Odontologia da Universidade de São Paulo (FOUSP) funciona e organiza-se.

A Human Teeth Bank (HTB) is a nonprofit institution, associated to a college, to a university or to some other institution. Its purpose is to fulfill academic needs, by supplying human teeth for research or for preclinical laboratory training of students, thus eliminating the illegal commerce of teeth that still takes place in dental schools. It is also up to an HTB to work for the elimination of cross-infection caused by indiscriminate handling of extracted teeth. In order to work properly, an HTB should have a strict control of its internal procedures, which include separation and stocking of teeth, as well as an appropriate maintaining of donors' and beneficiaries' records. In this article, we discuss the functions that an HTB can perform, and how the Human Teeth Bank, School of Dentistry, University of São Paulo, works and organizes itself today.