Evidence map›Paper›PMID 33172456›Full record

ArticleBMC oral health2020

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

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

Abstract read
In one paragraph

Article in BMC oral health, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 27 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
27citing papers in PubMed, 1 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

27 citing papers in PubMed, 1 synthesis or guideline pooled it.

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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

9 authors.

Jun Hui WangState 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.
Kuan YangDepartment of Orthodontics, College of Stomatology, Xi'an Jiaotong University, No. 98, Xiwu Road, Xincheng District, Xi'an, Shaanxi, China.
Bai Ze ZhangState 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.
Zhi Fei ZhouDepartment of Stomatology, General Hospital of Tibet Military Region, Chinese People's Liberation Army, Lhasa, Tibet, China.
Zi Rui WangState 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.
Xin GeState 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.
Lu Lu Wang
Yu Jiang ChenState 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.
Xiao Jing WangState 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. wxjing@fmmu.edu.cn.ORCID 0000-0001-5485-750X

Funding

National Natural Science Foundation of China 81670988Science and Technology Planning Project of Shannxi Province, China 2020SF-013
6 · The paper itself

Abstract

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

methodsDentin 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.

resultsSEM 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.

conclusionsPre-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.

Indexed as

Dental BondingLasers, Solid-StateDental CementsDentinHumansMicroscopy, Electron, ScanningResin CementsShear StrengthTooth, DeciduousDental CementsResin CementsDentin tabletsDentin tubulesEr:YAG laserPeritubular dentinPrimary teethShear bond strength

Identifiers

PMID33172456
PMCPMC7653740

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.