Effect of Er:YAG laser and organic matrix on porosity changes in human enamel

Ding, Ying; Chuah, Gaik‐Khuan; Hsu, Chin‐Ying Stephen

doi:10.1016/s0300-5712(03)00138-6

Cited by 91 publications

(74 citation statements)

References 18 publications

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“…3 The blocking of intra and inter spaces of enamel due to heating of the organic matrix has also been suggested as a possible mechanism for caries prevention. 5,27 Microhardness readings indicate the mineral content of the teeth, and the quantity of calcium ion could be representative for any alteration in the composition of dental hard tissue which affects its permeability and solubility in different media. In the present study, it was found that the quantity of calcium ion was significantly greater in laserthan bur-prepared cavities.…”

Section: Discussionmentioning

confidence: 99%

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: Discussionmentioning

confidence: 99%

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

2016

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“…The morphology of laser-prepared cavities leads to an increased area of adhesive interface, which likely takes more time to be degraded. Also, the Er:YAG laser-treated surface presents fusion and sealing of the enamel micropores (20) and, consequently, a reduction in solubility (21,22). This is despite the action of acid etching that dissolves the hydroxyapatite (23), which may leave the adhesive interface vulnerable to hydrolytic degradation (10).…”

Section: Discussionmentioning

confidence: 99%

Bond Durability of Er:YAG Laser-Prepared Primary Tooth Enamel

Borsatto¹,

Martinelli²,

Contente³

et al. 2013

Braz. Dent. J.

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This study evaluated in vitro the influence of thermocycling and water storage (WS) on the shear bond strength (SBS) of composite resin in cavities prepared in primary tooth enamel with conventional bur or Er:YAG laser. The test surfaces were obtained from 48 primary molars and randomly assigned to 2 groups (n=24), according to cavity preparation: A: bur-preparation and B: Er:YAG laser irradiation. The specimens were restored with an etch-and-rinse adhesive system and composite resin. Each group was divided into 4 subgroups (n=6) according to WS duration and number of thermal cycles (TCs): I: 24 h WS/no thermocycling; II: 7 days WS/500 TCs; III: 1 month WS/2,000 TCs; IV: 6 months WS/12,000 TCs. The specimens were tested to failure in shear strength at a crosshead speed of 0.5 mm/min. Data were analyzed statistically by two-way ANOVA and Tukey's test. SBS means (S.D.) in MPa were: AI: 17.45 (2.03), AII:16.38 (1.49), AIII: 6.88 (0.66), AIV: 7.77 (1.53), BI: 12.32 (0.99), BII: 15.37 (2.24), BIII: 15.05 (2.01) and BIV-5.51 (1.01). WS duration and number of TCs influenced significantly the SBS values only for BIV (p<0.05). AI presented the highest SBS value, which was statistically similar to those of AII, BII and BIII. In conclusion, the adhesion of an etch-and-rinse adhesive to Er:YAG laser-irradiated primary tooth enamel was affected by the methods used to simulate degradation of the adhesive interface only when 6 months WS/12,000 TCs were employed.

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“…The diffusion pathway blockage affects the porosity of the structures and consequently impairs penetration of the adhesive components. 9) Moreover, after laser irradiation, the dental surfaces are chemically modified. Irradiation with erbium lasers promotes loss of carbonate, formation of new hydroxyapatite-like crystals, and consequently more acid-resistant surfaces.…”

Section: ⅳ Discussionmentioning

confidence: 99%

“…8) It has been recommended for minimally invasive purposes, due to its precise ablation of dental structure without side-effects to the pulp and surrounding tissues. 9) According to the manufacturers, Er,Cr:YSGG laser can be applied in various procedures including laser-etching, soft-tissue mucous membrane and cutaneous surgery and relief of dentin hypersensitivity, as well as cutting enamel, dentin and bone.…”

Section: ⅰ Introductionmentioning

confidence: 99%

The effect of Er,Cr:YSGG irradiation on microtensile bond strength of composite resin restoration

Son

Kim

Hur

et al. 2010

J Korean Acad Conserv Dent

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The purpose of this study was to evaluate the effect of Er,Cr:YSGG laser irradiation with hypersensitivity mode on microtensile bond strength of composite resin. Twenty extracted permanent molars were randomly assigned to six groups, according to the irradiation of Er,Cr:YSGG laser, adhesive system (Optibond FL or Clearfil SE bond) and application time of etchant (15 sec or 20 sec). Then composite resin was build up on each conditioned surface. The restored teeth were stored in distilled water at room temperature for 24 h and twelve specimens for each group were prepared. All specimens were subjected to microtensile bond strength and the fracture modes were evaluated. Also, the prepared dentin surface and laser irradiated dentin surface were examined under SEM.The results were as follows: 1. The microtensile bond strength of laser irradiated group was lower than that of no laser irradiated group. 2. Regardless of laser irradiation, the microtensile bond strength of Optibond FL was higher than that of Clearfil SE bond. And the microtensile bond strength of 20 sec etching group was higher than that of 15 sec etching group when using Optibond FL. 3. The SEM image of laser irradiated dentin surface showed prominent peritubular dentin, opened dentinal tubules and no smear layer. [J Kor Acad Cons Dent 35(2):134-142, 2010]

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Effect of Er:YAG laser and organic matrix on porosity changes in human enamel

Cited by 91 publications

References 18 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

Bond Durability of Er:YAG Laser-Prepared Primary Tooth Enamel

The effect of Er,Cr:YSGG irradiation on microtensile bond strength of composite resin restoration

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