Acid Resistance and Structural Changes of Human Dental Enamel Treated with Er:YAG Laser

Rodríguez‐Vilchis, Laura Emma; Contreras‐Bulnes, Rosalía; Sánchez-Flores, Ignacio; Sámano, E. C.

doi:10.1089/pho.2008.2454

Cited by 33 publications

(32 citation statements)

References 22 publications

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“…Although subablative Er:YAG laser irradiation increased microhardness and quantity of calcium ion in both laser-and bur-prepared cavities, but the difference was not significant compared to that of the relevant control groups. This is consistent with the outcomes of Rodriguez-Vilchis et al 30 who found that acid resistance of enamel did not increase as expected following subablative Er:YAG laser irradiation. Apel et al 31 indicated no significant difference in calcium solubility between the specimens irradiated with the subablative Er:YAG and Er,Cr:YSGG lasers and that of the control.…”

Section: Discussionsupporting

confidence: 92%

“…Other studies also indicated topographical alterations including irregularities, craters and cracks in enamel and dentin specimens treated by Er:YAG or Er,Cr:YSGG lasers. 10,11,[20][21][22][23]30,33 The laser settings used in this study were selected in order to produce efficient enamel and dentin ablation, simulating the clinical conditions. Most of the previous studies used lower pulse repletion rates compared to that used in this study, but the number of microexplosions and the rate of ablation are directly dependent on this parameter.…”

Section: Discussionmentioning

confidence: 99%

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Structural and Morphological Changes in Human Dentin after Ablative and Subablative Er:YAG Laser Irradiation

2016

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Introduction: This study investigated the influence of Erbium-Doped Yttrium Aluminum Garnet (Er:YAG) laser on microhardness, chemical composition and subsurface morphology of dentin cavity walls. Methods: Forty sound human premolars were selected and randomly assigned into four groups. Class V cavities were prepared either with an Er:YAG laser (groups 1 and 2; 15 Hz, 250 mJ for enamel, 10 Hz, 200 mJ for dentin) or with a high speed handpiece (groups 3 and 4). The specimens in groups 1 and 3 served as the control, whereas those in groups 2 and 4 were exposed to subablative laser irradiation following cavity preparation (10 Hz, 50 mJ). After bisecting the specimens, one half was subjected to microhardness assessment and the other half was evaluated by SEM-EDS analysis. Results: Microhardness was significantly greater in the specimens prepared by both ablative and subablative laser irradiation (group 2) than that of the bur-prepared cavities (groups 3 and 4) (P < 0.05). The quantity of calcium ion was significantly greater in cavities prepared by the Er:YAG laser (groups 1 and 2) compared to that of the bur cavities (groups 3 and 4) (P < 0.05). Subablative irradiation improved microhardness and weight percentage of calcium ion in both laser and bur cavities, but the difference was not significant compared to that of the relevant control group (P > 0.05). Conclusion: Cavity preparation with an Er:YAG laser could be considered as an alternative to the conventional method of drilling, as it enhances the mechanical and compositional properties of lased dentin, especially when combined by subablative irradiation.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Structural and Morphological Changes in Human Dentin after Ablative and Subablative Er:YAG Laser Irradiation

2016

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“…15 On the other hand, an increase in enamel acid resistance associated with Er:YAG laser irradiation of smooth surfaces has been suggested by several authors. 10,11,13 The results from a previous study 17 pointed out that the used subablative energy density did not promote an increase in the acid resistance of the occlusal enamel surface. In contrast, evident enamel morphological changes were found by SEM evaluation.…”

Section: Discussionmentioning

confidence: 95%

“…15,16 One previous study evaluated enamel morphological changes and acid resistance after subablative Er:YAG laser irradiation. Although the acid resistance was not increased, scanning electron microscopy (SEM) analysis on the enamel surface showed craters and cracks, 17 which may be sites of high risk sites for bacterial 1 accumulation. In addition, a massive demineralization along the cracks has been reported.…”

mentioning

confidence: 99%

Morphological and Structural Changes on Human Dental Enamel After Er:YAG Laser Irradiation: AFM, SEM, and EDS Evaluation

Rodríguez‐Vilchis

Contreras‐Bulnes

Olea-Mejía

et al. 2011

Photomedicine and Laser Surgery

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Objective: The purpose of this study was to evaluate, using atomic force microscopy (AFM), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS), the morphological and structural changes of the enamel after irradiation with the Er:YAG laser. Background data: A previous study showed that subablative Er:YAG laser irradiation produced undesirable morphological changes on the enamel surface, such as craters and cracks; however, the enamel acid resistance was not increased. Methods: Fifty-two samples of human enamel were divided into four groups (n ¼ 13): Group I was the control (no laser irradiation), whereas Groups II, III, and IV were irradiated with the Er:YAG 100 mJ (12.7 J /cm 2 ), 100 mJ (7.5 J/cm 2 ), and 150 mJ (11 J/cm 2 ), respectively, at 10 Hz with water spray. The morphological changes were observed by AFM and SEM. The weight percentages (wt%) of calcium (Ca), phosphorus (P), oxygen (O) and chlorine (Cl) were determined in the resultant craters and their periphery using EDS. Kruskal-Wallis and Mann-Whitney U tests were performed ( p 0.05) to distinguish significant differences among the groups. Results: The AFM images showed cracks with depths between 250 nm and 750 nm for Groups II and IV, respectively, and the widths of these cracks were 5.37 mm and 2.58 mm. The interior of the cracks showed a rough surface. The SEM micrographs revealed morphological changes. Significant differences were detected in Ca, P, and Cl in the crater and its periphery. Conclusions: AFM observations showed triangular-shaped cracks, whereas craters and cracks were evident by SEM in all irradiated samples. It was not possible to establish a characteristic chemical pattern in the craters.

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“…At first, EDS analysis was introduced into dental research for the basic characterization of restorative dental materials used to repair damaged teeth and/or replace missing teeth (Marshall et al, 1988). More recently, this technique has been used to assess structural changes in tooth surfaces produced by the application of dental materials (Caltabiano, et al, 1996;Papagiannoulis, et al, 2002;Rosin-Grgewt, et al, 2006;Weerasinghe, et al, 2007;Della, et al, 2008;Markovic, et al, 2008;Paradella, et al, 2008;Scougall-Vilchis, et al, 2009;Keinan, et al, 2010) and of laser irradiation (Rodríguez-Vilchis, et al, 2010;Rodríguez-Vilchis, et al, 2011). The purpose of this chapter is to present the use of EDS as a useful technique for dental research, taking as references previous reports on this area of the knowledge.…”

Section: Introductionmentioning

confidence: 99%

Structural Changes on Human Dental Enamel Treated with Er:YAG, CO2 Lasers and Remineralizing Solution: EDS Analysis

Contreras‐Bulnes¹,

Olea-Mejía²,

Rodríguez‐Vilchis³

et al. 2012

Oral Health Care - Prosthodontics, Periodontology, Biology, Research and Systemic Conditions

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Acid Resistance and Structural Changes of Human Dental Enamel Treated with Er:YAG Laser

Abstract: The results of this study suggest that acid resistance of enamel due to subablative Er:YAG laser irradiation on the samples did not increase as expected. Morphological microscopic changes included craters and cracks on the irradiated zones.

Cited by 33 publications

References 22 publications

Structural and Morphological Changes in Human Dentin after Ablative and Subablative Er:YAG Laser Irradiation

Structural and Morphological Changes in Human Dentin after Ablative and Subablative Er:YAG Laser Irradiation

Morphological and Structural Changes on Human Dental Enamel After Er:YAG Laser Irradiation: AFM, SEM, and EDS Evaluation

Structural Changes on Human Dental Enamel Treated with Er:YAG, CO2 Lasers and Remineralizing Solution: EDS Analysis

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