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A evidencia cientifica da cariologia atual vem apontando para a promocao de saude bucal, tecnicas preventivas, diagnostico precoce da doenca carie e suas lesoes nos elementos dentais, remineralizacao de lesoes de carie incipientes e a intervencao restauradora celere como procedimentos minimamente invasivos. Durante o ato de remocao de lesao de carie, e comum remover-se inadvertidamente tambem tecido dental higido durante a fase final, por ser um tanto quanto dificil precisar clinicamente os limites entre tecido dental comprometido e tecido dental viavel. Usando-se a tecnologia com lasers de Erbio, uma dica clinica subjetiva e a mudanca da percepcao do som emitido pela ablacao do tecido dental ao passar-se de substrato cariado para higido (de grave para agudo), como uma forma adicional de saber que a ablacao naquele ponto deve ser interrompida. Este estudo visa classificar estas diferencas sonoras em dentina e torna-las um parâmetro objetivo para odontologia de minima intervencao ao usar-se lasers de Erbio. Para tanto, foram realizadas tres fases do estudo: primeiramente, utilizaram-se vinte dentes posteriores humanos, sendo dez cariados e dez higidos. A dentina foi irradiada com laser de Er:YAG sob os mesmos parâmetros, distância e refrigeracao e um microfone monodirecional foi posicionado a 10cm da area operatoria para captacao e gravacao dos sons produzidos pela ablacao ao se operar tanto em dentina higida quanto cariada. Dez pulsos por arquivo foram entao analisados em um software (200 analises). Foram encontradas diferencas entre os padroes sonoros produzidos dos grupos cariados e higidos e encontrado um ponto de corte para estas frequencias sonoras, que seria testado a seguir. Em outra segunda etapa, foi desenvolvido, testado e aplicado um software limitador de frequencia sonora, para que, em tempo real, avisasse o operador se o tecido dentinario que estava sendo ablacionado pelo laser de Erbio (Er:YAG e Er, Cr:YSGG) era... Studies in cariology have been struggling for the development of health promotion, caries prevention techniques, precocious diagnoses of lesions, re-mineralization of incipient carious lesions and early restorative intervention with minimally invasive procedures. When removing caries lesion, healthy dental structure is often removed inadvertently during its final phase, for being quite difficult to clinically precise the limits between viable and decayed dental tissues. With laser technologies, a subjective clinical hint, often used to indicate when tissue ablation should be stoppedis that different sounds are perceptive whether in carious (bass) or in healthy (treble) dental structure; when sound produced by ablation turned treble it would mean that healthy tissue was reached. This study aims to classify those audio differences and to turn them into objective parameters for a conservative operative dentistry with minimally invasive tissue removal when using Erbium lasers. For so, three phases of this study were needed: at first, twenty freshly extracted posterior human teeth were used (10 decayed and 10 sound teeth). Dentine was irradiated with Er:YAG laser under the same parameters, distance and refrigeration and a mono directional microphone was set 10cm far from the operative area in order to capture and record the ablation produced sounds when working either on carious or healthy dentine. Ten pulses per file were then analyzed in a computer software (200 analyses). It was permitted to draw differences between decayed and healthy produced sounds and also to establish a cut-off value for these sound frequencies, that would be tested later on. On a second phase, a piece of software which was able to border the sound frequency was then developed and tested. This tool was meant to warn the operator, in real-time basis, if sound dentine was reached, while it was ablated by Erbium lasers (either Er:YAG or Er, Cr:YSGG) and so one could...

O som da ablação do tecido dentinário com lasers de Érbio como possível parâmetro de mínima intervenção