Saturação de oxigênio pulpar em incisivos centrais superiores hígidos submetidos ao clareamento dentário: ensaio clínico randomizado
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2018-03-16
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Universidade Federal de Goiás
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Aim: To evaluate the oxygen saturation level (SaO 2 ) of the pulp of the central upper
incisors, before, during and after the performance of the combined technique of
toothbleaching by means of pulse oximetry. Materials and methods: This was a
randomized, triple blind clinical trial, in which the initial sample consisted of 80 patients
aged 18 to 27 years, 160 central incisors healthy upper randomly allocated into 4 groups:
G1 - Office bleaching with two applications hydrogen peroxide (H 2 O 2 ) at 35% for 20
minutes each, followed by home bleaching with carbamide peroxide 10% for 2 hours a
day for 16 days; G2 - Protocol used in G1, with the use of a desensitizer in the dentifrice;
G3 - Office bleaching with application of H 2 O 2 at 35% and one placebo gel, both for 20
minutes, followed by application to home bleaching with carbamide peroxide 10% for 2
hours a day for 16 days; G4 - Protocol used in G3, with use of desensitizer in the
dentifrice. The measurement at SaO 2 of the pulp was performed on the upper central
incisors before (T0) and immediately after (T1) the office bleaching; in the 5 th (T2), 8 th (T3),
12 th (T4) and 16 th day of home bleaching (T5); and after 7 (T6) and 30 (T7) days of
completion of procedures. The mean level of SaO 2 pulp was described by mean and
standard deviation. times and the average values of saturation in groups by Estimations
Generalized Equations model were compared (GEE) and used the Student t test for
paired samples for analysis of overall average initial time (T0) and after thirty days after
the end of tooth bleaching (T7) (p <0.05). Outcomes: The final sample consisted of 60
patients (n = 120 teeth), G1 (n = 28), G2 (n = 40), G3 (n = 26) and G4 (n = 26). The
results showed a mean pulp SaO 2 level at G0 of 84.29%, G2 of 84.38%, G3 of 84.79%
and G4 of 85.83%. There was a reduction of T0 for T1, 81.96%, 82.06%, 82.19% and
81.15% for G1, G2, G3 and G4, respectively, with difference in G4 (p = 0.006). During
home bleaching, there was returned of the pupal oxygen saturation level in all groups,
with mean values in T7 of 86.55%, 86.60%, 85.71%, 87.15% for G1, G2, G3 and G4,
respectively, with difference in G2 (p = 0.004). Conclusion: The average level of initial
pulp oxygen saturation for central upper incisors was 84.76%, with changes in saturation
during the combined technique of tooth bleaching and final mean level, after 30 days, of
86.52%.
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LIMA, L. F. Saturação de oxigênio pulpar em incisivos centrais superiores hígidos submetidos ao clareamento dentário: ensaio clínico randomizado. 2018. 51 f. Dissertação (Mestrado em Ciências da Saúde) - Universidade Federal de Goiás, Goiânia, 2018.