O efeito da espessura do esmalte e dentina na interpretação do oxímetro de pulso

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Universidade Federal de Goiás


Introduction: The thickness of the dental substrate is a factor that interferes with the result of the evaluation of the pulp oxygen saturation level, capable of reducing the pulse oximeter accuracy. This study evaluated the interference of enamel-dentin thickness in the interpretation of the pulse oximeter, having as variation factors the finger oxygen saturation and the presence and absence of light. Materials and Methods: Forty-two healthy human lower molars were sectioned centrally in the mesiodistal direction. After sectioning, the buccal and lingual faces were worn on the dentin surface and evaluated at 4.0mm, 3.0mm and 2.0mm thickness. A reference device was made for the alignment of the pulse oximeter diode, buccal tooth face, participant's little finger, lingual face and receiving diode. The positive control of the experiment was performed on the participant's finger without interposition of the dental faces, and the negative by juxtaposition of the dental faces without the participant's finger. All measurements were performed in the presence and absence of light. The variables were described by the mean and standard deviation, and the confidence interval presented. To compare the groups, analysis of variance (ANOVA) was used, followed by Bonferroni correction. Student's t-test was used to compare paired samples, and to assess the correlation between oxygen saturation and pulse level, the Pearson Correlation Coefficient was used. The significance level of 5%. Results: The average level of oxygen saturation in the finger was lower when the dental structure of 4.00.2mm, 92.7% and 89.3% was interposed, in the presence and absence of light, respectively, than when it was 3.00.2mm, 95.5% and 94.5%, and 2.00.2mm, 96.4% and 96.0% (P <0.001). The mean oxygen saturation level in the positive control was 96.1%. In the negative control samples, no oximetry and pulse results were recorded. Conclusions: The thickness of the dental structure interfered with the pulse oximeter interpretation, with significant reduction of oxygen saturation level for larger thicknesses, and the presence and absence of light changed the pulse oximeter interpretation.



SESTARI, L. E. O efeito da espessura do esmalte e dentina na interpretação do oxímetro de pulso. 2020. 47 f. Dissertação (Mestrado em Odontologia) - Universidade Federal de Goiás, Goiânia, 2020.