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BMC Oral Health
Published in: BMC Oral Health 1/2020

Open Access 01-12-2020 | Laser | Research article

Effects of Er:YAG laser pre-treatment on dentin structure and bonding strength of primary teeth: an in vitro study

Authors: Jun hui Wang, Kuan Yang, Bai ze Zhang, Zhi fei Zhou, Zi rui Wang, Xin Ge, Lu lu Wang, Yu jiang Chen, Xiao jing Wang

Published in: BMC Oral Health | Issue 1/2020

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Abstract

Background

To investigate the effects of Er:YAG laser pre-treatment on the dentin structure and shear bond strength of primary teeth.

Methods

Dentin specimens were prepared using freshly extracted intact primary molars and divided randomly into four groups based on the surface treatment applied. The control and etchant groups received no treatment and conventional acid etching treatment, respectively, while the energy and frequency groups received laser surface treatment with variable energy (50–300 mJ) and frequency (5–30 Hz) parameters. The morphology was observed using scanning electron microscopy. The surface-treated dentin slices were bonded to resin tablets, followed by thermocycle treatment. The shear strength was determined using a universal testing machine and de-bonded surfaces were observed using a stereomicroscope.

Results

SEM observation showed that the surface morphology of the dentin slices changed after etching as well as after Er:YAG laser pre-treatment with different energy and frequency values. The dentin tubules opened within a specific energy (50–200 mJ) and frequency (5–20 Hz) range. Beyond this range, the intertubular dentin showed cracks and structural disintegration. Shear strength tests showed no significant changes after acid etching. The shear strength increased significantly (P < 0.05) after Er:YAG laser pre-treatment compared with that of the control group. The shear strength increased within the same energy (50–200 mJ) and frequency (5–20 Hz) range as the tubule opening, but not significantly (P > 0.05). The most common mode of interface failure was adhesive (interface) failure, followed by mixed and resin cohesive failure.

Conclusions

Pre-treatment using Er:YAG laser opens the dentinal tubules without the formation of a smear layer and improves the bonding strength between the primary teeth dentin and the resin composites.
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Metadata
Title
Effects of Er:YAG laser pre-treatment on dentin structure and bonding strength of primary teeth: an in vitro study
Authors
Jun hui Wang
Kuan Yang
Bai ze Zhang
Zhi fei Zhou
Zi rui Wang
Xin Ge
Lu lu Wang
Yu jiang Chen
Xiao jing Wang
Publication date
01-12-2020
Publisher
BioMed Central
Keyword
Laser
Published in
BMC Oral Health / Issue 1/2020
Electronic ISSN: 1472-6831
DOI
https://doi.org/10.1186/s12903-020-01315-z

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