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Lasers in Dental Science
Published in: Lasers in Dental Science 2-4/2017

01-12-2017 | Original Article

Comparative study of intrapulpal temperature stress during Er,Cr:YSGG-supported dental bleaching versus conventional dental power bleaching. An in vitro study

Authors: D. Strakas, K. Tolidis, E. Koliniotou-Koumpia, L. Vanweersch, R. Franzen, N. Gutknecht

Published in: Lasers in Dental Science | Issue 2-4/2017

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Abstract

Objective

The purpose of this in vitro study was to evaluate the safety of the Er,Cr:YSGG bleaching treatment in terms of pulp chamber temperature increase in teeth, as well as to test two different bleaching gels applied in the same procedure.

Introduction

Our previously published pilot study suggested that the most susceptible teeth during Er,Cr:YSGG-supported bleaching are the maxillary lateral incisors and mandibular incisors. These two types of teeth were used in order to assess the safety of the procedure with regard to tooth vitality.

Materials and methods

For the needs of this study, 60 teeth were tested (30 maxillary lateral incisors (TT1) and 30 mandibular incisors (TT2)). The experimental procedure involved the use of an Er,Cr:YSGG laser (2780 nm, Waterlase MD, Biolase, USA) with two different bleaching gels. A yellow-colored bleaching agent, with a concentration of 38% H2O2 (Power whitening, WHITEsmile GmbH, Germany) (BG 1), and a purple-colored agent for in-office tooth whitening, with a concentration of 35% H2O2 (Laser-White20, Biolase) (BG 2), were utilized in the experiment. The tip employed was a 6-mm-long Z-type glass tip (MZ8) of 800 μm diameter. As to the applied power settings, the average output power was set at 1.25 W and the pulse duration at 700 μs (S-mode), while the pulse repetition rate was 10 Hz.

Results

The results showed that during Er,Cr:YSGG-supported tooth bleaching, the temperature rise in the pulp chamber did not exceed the temperature threshold of 5.6 °C, regardless of the bleaching gel used (2.03 ± 0.55 °C for BG1 and 1.53 ± 0.48 °C for BG2) and can therefore be considered a safe procedure. Moreover, a time-consistent higher temperature difference was observable during the BG1 application, compared to that of BG2.
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Metadata
Title
Comparative study of intrapulpal temperature stress during Er,Cr:YSGG-supported dental bleaching versus conventional dental power bleaching. An in vitro study
Authors
D. Strakas
K. Tolidis
E. Koliniotou-Koumpia
L. Vanweersch
R. Franzen
N. Gutknecht
Publication date
01-12-2017
Publisher
Springer International Publishing
Published in
Lasers in Dental Science / Issue 2-4/2017
Electronic ISSN: 2367-2587
DOI
https://doi.org/10.1007/s41547-017-0006-z

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