Avaliação in vivo da confiabilidade do localizador eletrônico Bingo na determinação do comprimento de trabalho, em situações de polpa vital e necrosada.

O objetivo deste trabalho foi avaliar in vivo, a confiabilidade do localizador eletronico Bingo, na determinacao do comprimento de trabalho, em situacoes de polpa vital e necrosada. Foram realizadas 56 afericoes eletronicas em pacientes entre 15 e 65 anos de idade, em tratamento na Disciplina de Endodontia da Universidade Luterana do Brasil (ULBRA – Canoas/RS). Dos dentes estudados, 25 possuiam canais com polpas vitais e 31, com polpa necrosada. Apos isolamento absoluto e abertura coronaria, estando a alca labial devidamente posicionada, introduziu-se, no interior do canal radicular, uma lima endodontica de 25 ou 31 mm conectada a um dos polos do aparelho, de diâmetro compativel com a anatomia do terco apical. Quando o visor do localizador eletronico acusava estar a ponta do instrumento a 1mm da saida foraminal, os dentes foram radiografados. Com o auxilio de uma lupa, regua milimetrada e negatoscopio, foi mensurada, na radiografia, a distância entre a ponta do instrumento e o vertice radiografico. Medidas compreendidas entre 0,5mm e 1,5mm foram consideradas confiaveis. Os resultados obtidos mostraram indice de confiabilidade de 92% para dentes com polpa viva e 83,87% para dentes com polpa mortificada. O localizador apical Bingo constitui-se em um excelente recurso auxiliar na odontometria, quando corretamente empregado. UNITERMOS: odontometria; canal radicular; endodontia. SUMMARY The aim of this study was to determine, in vivo, the ability of Bingo electronic apex locator to determine root length in vital and non vital teeth. For this purpose, 56 measurements were proceeded in patients aging 15 to 65 years, undergoing treatment at the Endodontics Discipline of the Brazilian Lutheran University (ULBRA – Canoas/RS). The teeth comprised of 25 vital pulp root canals and 31 with necrotic pulps. Following rubber dam placement and access cavity, with the liphook adequately positioned, a # 25 to 31 K-file, connected to the Bingo device was placed within the root canal. The file diameter was compatible to the canal at the root apex. When the screen would denote the file to be 1mm short of the apex, radiographs were taken. With the help of magnifying lenses and a ruler, the distance between the tip of the instrument and the radiographic vertex was measured. Values between 0.5 and 1.5mm were considered adequate. The results showed 92% of measurements within the adequate limits in teeth with vital pulps and 83.87% in cases of necrotic pulps. Bingo apex locator was considered an axcelent means to help root length determination, when used adequately. UNITERMS: root length; root canal; endodontics.

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