Laser-induced compositional changes on enamel: A FT-Raman study

Liu, Yuanyuan; Hsu, Chin‐Ying Stephen

doi:10.1016/j.jdent.2006.08.006

Cited by 69 publications

(70 citation statements)

References 29 publications

(34 reference statements)

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“…26,56 In contrast to a breakdown of protein matrix by proteolysis, the interaction between laser light, chromophore, and enamel can induce protein denaturation in such a way that the diffusion pathway in enamel may be blocked. 25 Subtle changes in the chemical environment, such as changes in pH, temperature, and ionic strength, can easily lead to breakage of weak links that stabilize the secondary and quaternary structures, which results in the denaturation of protein. 57 Indeed, the consolidation of the protein component of the organic matrix after denaturation can produce a significant reduction in the enamel crystal surface area available for acid decalcification.…”

Section: De Sant'anna Et Almentioning

confidence: 99%

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Dental Enamel Irradiated with Infrared Diode Laser and Photo-Absorbing Cream: Part 2—EDX Study

Sant'Anna

Santos

Soares

et al. 2009

Photomedicine and Laser Surgery

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Objective: The effects of laser-induced compositional changes on the enamel were investigated by energydispersive X-ray fluorescence spectrometry (m-EDX). After cariogenic challenge, we administered treatment of low-level infrared diode laser and a photo-absorbing cream (used to intensify the superficial light absorption). Background Data: Dental caries is considered the most prevalent oral disease. A simple and noninvasive caries preventive regimen is treating tooth enamel with a laser, either alone or in combination with fluoride, which reduces enamel solubility and dissolution rates. High power lasers are still not widely used in private practice. Low-power near-infrared lasers may be an alternative approach. Energy-dispersive m-EDX is a versatile and nondestructive spectroscopic technique that allows for a qualitative and quantitative elemental analysis of inorganic enamel components, such as calcium and phosphorus. Materials and Methods: Twenty-four extracted or exfoliated caries-free deciduous molars were divided into six groups: 1) control group (CTR-no treatment); 2) infrared laser treatment (L) (l ¼ 810 nm, 100 mW=cm 2 , 90 sec, 4.47 J=cm 2 , 9 J); 3) infrared laser irradiation and photo-absorbing agent (CL); 4) photo-absorbing agent alone (C); 5) infrared laser irradiation and fluoridated photo-absorbing agent (FCL); and 6) fluoridated photo-absorbing agent alone (FC). Samples were analyzed using m-EDX after two sets of treatments and pH cycling cariogenic challenges. Results: The CL group showed statistically significant increases in calcium and phosphorus (wt%) compared with the CTR group. The Ca=P ratio was similar in the FCL and CTR groups. There was a significant laser-induced reduction compared with the CTR group, and there was a possible modification of the organic balance content in enamel treated with laser and cream. Conclusion: m-EDX may be able to detect compositional changes in mineral phases of lased enamel under cariogenic challenge. Our results suggest that with a combined laser and photo-absorbing agent (CL) treatment, there was a possible disorganization of organic content in the tooth enamel with hydroxyapatite crystal reordering and reorganization.

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Section: De Sant'anna Et Almentioning

confidence: 99%

“…[20][21][22][23] Since the 1960s, it has been consistently demonstrated that high power lasers, under certain conditions, can reduce the rate of subsurface demineralization in the enamel, by altering the crystallinity, acid solubility, and permeability of enamel. [24][25][26] Nevertheless, the real mechanisms of caries inhibition by lasers remain unclear.…”

mentioning

confidence: 99%

Dental Enamel Irradiated with Infrared Diode Laser and Photo-Absorbing Cream: Part 2—EDX Study

Sant'Anna

Santos

Soares

et al. 2009

Photomedicine and Laser Surgery

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“…It has been indicated that laser irradiation can enhance the resistance of tooth structure against caries formation and progression through different mechanisms. [3][4][5][6] Although various lasers have been employed for the purpose of caries prevention, erbium family lasers including Erbium-Doped Yttrium Aluminum Garnet, (Er:YAG) and Erbium, Chromium-Doped Yttrium Scandium Gallium Garnet (Er,Cr:YSGG) are the only ones that can be employed for removing dentin and enamel structures. [7][8][9] Cavity preparation by the Er:YAG laser provides advantages such as low noise and vibration, and less pain and stress for the patients, but it is more expensive and time-consuming than the conventional technique with rotary instruments.…”

Section: Introductionmentioning

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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“…More hydroxide and pyrophosphate, but less carbonate, are also generally found, in comparison with unheated enamel (Apel, et al, 2002). The most accepted theory regarding the mechanism by which laser irradiation enhances enamel acid resistance is the reduction of bound carbonate, when the enamel surface is heated to the range of 100-400°C (Holcom & Young, 1980;Fowler & Kuboda, 1986;Liu & Hsu, 2007). Nevertheless, the modification of organic matter has been reported as one of the mechanisms in laser-induced caries prevention (the organic blocking theory) .…”

Section: Laser and Caries Preventionmentioning

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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Laser-induced compositional changes on enamel: A FT-Raman study

Cited by 69 publications

References 29 publications

Dental Enamel Irradiated with Infrared Diode Laser and Photo-Absorbing Cream: Part 2—EDX Study

Dental Enamel Irradiated with Infrared Diode Laser and Photo-Absorbing Cream: Part 2—EDX Study

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

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

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