Effects of Er:YAG laser pre-treatment on dentin structure and bonding strength of primary teeth: an in vitro study
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RESEARCH ARTICLE
Open Access
Effects of Er:YAG laser pre‑treatment on dentin structure and bonding strength of primary teeth: an in vitro study Jun hui Wang1, Kuan Yang2, Bai ze Zhang1, Zhi fei Zhou3, Zi rui Wang1, Xin Ge1, Lu lu Wang, Yu jiang Chen1 and Xiao jing Wang1*
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). 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. Keywords: Er:YAG laser, Primary teeth, Dentin tubules, Peritubular dentin, Shear bond strength, Dentin tablets
*Correspondence: [email protected]; [email protected] 1 State Key Laboratory of Military Stomatology and National Clinical Research Center for Oral Disease and Shaanxi Clinical Research Center for Oral Diseases, Stomatology Department of Children, School of Stomatology, The Fourth Military Medical University, No. 145, Changle West Road, Xincheng District, Xi’an, Shaanxi, China Full list of author information is available at the end of the article
Background In line with the improvement of living standards as a result of recent advancements, the concept of "painless and minimally invasive dentistry" has been widely adopted for the treatment of dental patients. For instance, laser therapy is widely used in the field of stomatology [1, 2] due to its promising benefits such as low noise, no vibration, and less heat, in accordance with the concept
© The Author(s) 2020. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use,
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