CADIOLI, Isabela Capparelli; RODRIGUES, Célia Regina Martins Delgado; NOGUEIRA, Gesse Eduardo Calvo    WANDERLEY, Márcia Turolla. Use of laser Doppler flowmetry in traumatized primary teeth. RGO, Rev. gaúch. odontol. (Online) []. 2010, 58, 2, pp. 263-268. ISSN 1981-8637.

The diagnosis of pulp necrosis in traumatized primary teeth is difficult. Pulp necrosis is usually detected after signs like fistula, periapical radiolucency and inflammatory root resorption appear. Data from anamnesis and clinical and radiographic examinations are limited. In order to improve diagnosis, the use of objective and noninvasive tests that assess blood flow has been suggested. The aim of this article was to present a clinical case where laser Doppler flowmetry was used to aid the diagnosis of pulp necrosis in the upper right central incisor (tooth 51) of a child aged 4 years and 2 months seen at the Pediatric Dental Trauma Research Center of the Pediatric Department of FOUSP. Tooth 51 presented no clinical sign of pulp necrosis. The laser Doppler flowmeter (Moor Instruments, Axminster, England) model moorLAB was used with a 780 nm diode laser, cut-off frequency of 15 kHz and intensity of 1mW. The flow value of tooth 51 was 2.1UA and the percentage variation between teeth 51 and 52 was 40.4%. These values classify the tooth as devitalized. Therefore, it was possible to obtain a diagnosis of pulp necrosis using laser Doppler flowmetry in a tooth without evident clinical signs of this sequela.

: deciduous tooth; dental pulp necrosis; tooth injuries.