scholarly journals Chemical Changes Associated with Increased Acid Resistance of Er:YAG Laser Irradiated Enamel

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Jennifer Manuela Díaz-Monroy ◽  
Rosalía Contreras-Bulnes ◽  
Oscar Fernando Olea-Mejía ◽  
María Magdalena García-Fabila ◽  
Laura Emma Rodríguez-Vilchis ◽  
...  
Keyword(s):  
Laser Irradiation ◽  
Structural Changes ◽  
Er:Yag Laser ◽  
Laser Energy ◽  
Dental Enamel ◽  
Acid Resistance ◽  
Control Groups ◽  
Acid Dissolution ◽  
Chemical Changes ◽  
Group I

Background. An increase in the acid resistance of dental enamel, as well as morphological and structural changes produced by Er:YAG laser irradiation, has been reported.Purpose. To evaluate the chemical changes associated with acid resistance of enamel treated with Er:YAG laser.Methods. Forty-eight enamel samples were divided into 4 groups (n=12). Group I (control); Groups II, III, and IV were irradiated with Er:YAG at 100 mJ (12.7 J/cm2), 200 mJ (25.5 J/cm2), and 300 mJ (38.2 J/cm2), respectively.Results. There were significant differences in composition of irradiated groups (with the exception of chlorine) and in the amount of calcium released.Conclusions. Chemical changes associated with an increase in acid resistance of enamel treated with Er:YAG laser showed a clear postirradiation pattern characterized by a decrease in C at.% and an increase in O, P, and Ca at.% and no changes in Cl at.%. An increased Ca/P ratio after Er:YAG laser irradiation was associated with the use of higher laser energy densities. Chemical changes produced by acid dissolution showed a similar trend among experimental groups. Stable or increased Ca/P ratio after acid dissolution was observed in the irradiated groups, with reduction of Ca released into the acid solution.

scholarly journals Chemical Changes of Enamel Produced by Sodium Fluoride, Hydroxyapatite, Er:YAG Laser, and Combined Treatments

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Alma Yadira Ceballos-Jiménez ◽  
Laura Emma Rodríguez-Vilchis ◽  
Rosalía Contreras-Bulnes ◽  
Jesús Arenas Alatorre ◽  
Rogelio José Scougall-Vilchis ◽  
...  
Keyword(s):  
Laser Irradiation ◽  
Sodium Fluoride ◽  
Er:Yag Laser ◽  
Combined Treatment ◽  
Dental Enamel ◽  
Chemical Changes ◽  
Treatment Groups ◽  
Human Enamel ◽  
Occlusal Surfaces

Occlusal pits and fissures of permanent molars are considered to have higher risk of developing caries. Enamel demineralization can be prevented by applying remineralizing agents, and their absorption increases with prior irradiation. This work evaluates the chemical changes produced by treating occlusal surfaces with sodium fluoride (NaF), hydroxyapatite-NaF-xylitol (HA-NaF-X), Er:YAG laser irradiation (L), and combinations thereof. Fifty enamel samples were randomly assigned to five groups (n=10): NaF, HA-NaF-X, L, L + NaF, and L + HA-NaF-X. The chemical composition of human enamel was evaluated before (BT) and after (AT) treatment using energy-dispersive X-ray spectroscopy (EDS) and expressed in atomic percentages (at%). For combined treatment groups, the products were applied after laser irradiation. The statistical analyses included a pairedt-test and ANOVA (p≤0.05). After treatment, a significant increase in F at% was observed in the NaF group (2.71 ± 1.41). The irradiated groups showed significant increases in Ca and P at% and the Ca/P ratio. The highest values occurred for L + NaF (30.44 ± 4.28 Ca at%, 11.97 ± 1.45 P at%, and 2.55 ± 0.22 Ca/P ratio). Er:YAG laser irradiation alone or in combined protocols increased the Ca and P content of dental enamel, in vitro.

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

2011 ◽  
Vol 29 (7) ◽  
pp. 493-500 ◽  
Author(s):  
Laura Emma Rodríguez-Vilchis ◽  
Rosalía Contreras-Bulnes ◽  
Oscar Fernando Olea-Mejìa ◽  
Ignacio Sánchez-Flores ◽  
Claudia Centeno-Pedraza
Keyword(s):  
Laser Irradiation ◽  
Structural Changes ◽  
Er:Yag Laser ◽  
Dental Enamel

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

2010 ◽  
Vol 28 (2) ◽  
pp. 207-211 ◽  
Author(s):  
Laura Emma Rodríguez-Vilchis ◽  
Rosalía Contreras-Bulnes ◽  
Ignacio Sánchez-Flores ◽  
Enrique Cuauhtémoc Samano
Keyword(s):  
Structural Changes ◽  
Er:Yag Laser ◽  
Dental Enamel ◽  
Acid Resistance

scholarly journals Human Dental Enamel and Dentin Structural Effects after Er:yag Laser Irradiation

2014 ◽  
Vol 15 (3) ◽  
pp. 283-287 ◽  
Author(s):  
Mateus Rodrigues Tonetto ◽  
Marcelo Ferrarezi de Andrade ◽  
Shelon Cristina Souza Pinto ◽  
Darlon Martins Lima ◽  
José Roberto Cury Saad ◽  
...  
Keyword(s):  
Laser Irradiation ◽  
Soft Tissues ◽  
Er:Yag Laser ◽  
Laser System ◽  
Dental Enamel ◽  
Target Tissue ◽  
Structural Effects ◽  
Ablation Process ◽  
Dental Tissues ◽  
Laser Systems

ABSTRACT Ideally projected to be applied on soft tissues, infrared lasers were improved by restorative dentistry to be used in hard dental tissues cavity preparations — namely enamel and dentin. This paper evidentiates the relevant aspects of infrared Erbium laser's action mechanism and its effects, and characterizes the different effects deriving from the laser's beams emission. The criteria for use and selection of optimal parameters for the correct application of laser systems and influence of supporting factors on the process, such as water amount and its presence in the ablation process, protection exerted by the plasma shielding and structural factors, which are indispensable in dental tissues cavity preparation related to restorative technique, are subordinated to optical modifications caused by the interaction of the energy dissipated by these laser light emission systems in the targeted tissue substrate. Clinical relevance Differences in the action of infrared Erbium laser system in regard to the nature of the ablation process and variations on the morphological aspects observed in the superficial structure of the target tissue irradiated, may be correlated to the structural optical modifications of the substrate produced by an interaction of the energy propagated by laser systems. How to cite this article Lima DM, Tonetto MR, de Mendonça AAM, Elossais AA, Saad JRC, de Andrade MF, Pinto SCS, Bandéca MC. Human Dental Enamel and Dentin Structural Effects after Er:yag Laser Irradiation. J Contemp Dent Pract 2014;15(3):283-287.

scholarly journals Effect of Er:YAG laser irradiation on acid resistance to bovine dentin in vitro.

2000 ◽  
Vol 41 (2) ◽  
pp. 43-48 ◽  
Author(s):  
ATSUSHI KAMEYAMA ◽  
HIROSHI KOGA ◽  
MASAKAZU TAKIZAWA ◽  
YOSHINORI TAKAESU ◽  
YOSHITO HIRAI
Keyword(s):  
Laser Irradiation ◽  
Er:Yag Laser ◽  
Acid Resistance

scholarly journals The Effect of Er:YAG Laser Irradiation Combined With Fluoride Application on the Resistance of Primary and Permanent Dental Enamel to Erosion

2019 ◽  
Vol 10 (4) ◽  
pp. 290-296
Author(s):  
Fatemeh Molla Asadollah ◽  
Seyed Masoud Mojahedi ◽  
Hanie Nojedehian ◽  
Mohammad Asnaashari ◽  
Negin Asnaashari
Keyword(s):  
Laser Irradiation ◽  
Repeated Measures ◽  
Er:Yag Laser ◽  
Dental Enamel ◽  
Micro Hardness ◽  
Combined Use ◽  
Kolmogorov Smirnov ◽  
Ph Cycling ◽  
Mineral Loss ◽  
Smirnov Test

Introduction: Erosion is an important cause of tooth mineral loss. The combined use of lasers and fluoride has been introduced as a novel modality for the prevention of enamel demineralization. This study aimed to assess the effect of Er:YAG laser combined with fluoride application on primary and permanent enamel resistance to erosion. Methods: Eighty enamel specimens of permanent (n=40) and primary (n=40) molars were prepared and randomly assigned to 4 groups: C—control (no pretreatment), F—acidulated phosphate fluoride (APF) gel, FL—APF gel application followed by Er:YAG laser irradiation, and LF—Er:YAG laser irradiation followed by the application of APF gel . The specimens were then submitted to pH cycling using Coca-Cola (pH=2.4). Enamel micro-hardness was measured using the Vickers microhardness tester before pretreatment and after the erosive process. The collected data were analyzed using the Kolmogorov-Smirnov test, two-way ANOVA and repeated measures ANOVA. Results: The micro-hardness of both permanent and primary enamel specimens significantly decreased after the erosive process (P<0.05). In the permanent enamel specimens, the greatest reduction in micro-hardness was noted in groups C and F, while the least reduction was noted in group FL. However, these differences were not statistically significant (P>0.05). In the primary enamel specimens, the greatest reduction in micro-hardness was noted in groups C and LF, while the least reduction was noted in group F. These differences were not statistically significant (P>0.05). Conclusion: Within the limitations of this study, Er:YAG laser irradiation combined with fluoride application could not prevent erosion in permanent and primary enamel during the erosive process.

scholarly journals Molecular analysis of Er:YAG laser irradiation on dentin

2006 ◽  
Vol 17 (1) ◽  
pp. 15-19 ◽  
Author(s):  
Luís Eduardo Silva Soares ◽  
Aldo Brugnera Junior ◽  
Fátima Zanin ◽  
Marcos Tadeu Tavares Pacheco ◽  
Airton A. Martin
Keyword(s):  
Raman Spectroscopy ◽  
Laser Irradiation ◽  
Er:Yag Laser ◽  
Chemical Constituents ◽  
Organic Content ◽  
Control Group ◽  
Significance Level ◽  
Group Iii ◽  
Group I ◽  
Group Ii

The aim of this study was to evaluate by dispersive Raman spectroscopy the mineral and organic components of human dentin before and after laser irradiation and acid etching. The occlusal enamel of six non-carious human third molars was removed providing 6 dentin discs, which were divided in four quadrants each of them receiving a different surface treatment: etching with a 37% phosphoric acid gel (control); irradiation by Er:YAG laser (KaVo Key Laser II) with 80 mJ, 3 Hz, 30 s (group I); 120 mJ, 3 Hz, 30 s (group II); and 180 mJ, 3 Hz, 30 s (group III). The Raman spectra of normal (untreated) and treated dentin were analyzed and the mineral and the organic component were evaluated. Results were submitted to statistical analysis by ANOVA and Tukey's test at 5% significance level. The minerals and organic content were less affected in the control group and group I (p>0.05). Group II presented more reduction in mineral content (p<0.01) whereas in group III the inorganic (p<0.05) and organic (p<0.01) content were more affected. Dispersive Raman spectroscopy provided valid information of dentin chemical constituents with non-chemical sampling preparation.

scholarly journals The effect of Erbium-doped Yttrium Aluminum Garnet laser irradiation on push-out bond strength of endodontic sealers with root canal dentin: An in vitro evaluation of push-out bond strength and failure modes

2021 ◽  
Vol 1 ◽  
pp. 2-8
Author(s):  
J. Sandeep Reddy ◽  
K. B. Jayalakshmi ◽  
I. Sujatha ◽  
Prasannalatha Nadig ◽  
Nilima Salim Isani ◽  
...  
Keyword(s):  
Bond Strength ◽  
Laser Irradiation ◽  
Root Canal ◽  
Yttrium Aluminum Garnet ◽  
Er:Yag Laser ◽  
Group I ◽  
Erbium Doped ◽  
Yttrium Aluminum ◽  
Ah Plus ◽  
Push Out

Objectives: The aim of this study was to evaluate and compare the push-out bond strength of bioceramic sealer and resin-based sealer on Erbium-doped Yttrium Aluminum Garnet (Er:YAG) treated root canals. Material and Methods: Sixty single-rooted teeth were collected, decoronated apical to the cementoenamel junction, maintaining the minimum root length of 14 mm. Samples were instrumented with WaveOne Gold primary file and divided into two experimental groups (n = 30), based on laser irradiation: Group I: No laser and Group II: Er:YAG laser irradiated. Groups I and II were again divided into two subgroups “a” (AH Plus) and “b” (mineral trioxide aggregate [MTA] Fillapex) with 15 samples in each group. As per the grouping, sealers were coated onto the canal walls and obturated. After 24 h of storage in 100% humidity at 37°C, all the samples were sectioned transversely and push-out test was performed using universal testing machine. Stereomicroscope was used to determine the mode of failure. A one-way analysis of variance was employed to compare the mean POBS. Kolmogorov–Smirnov and Shapiro–Wilk parametric tests were done to check the normality. The Games-Howell multiple post hoc test was used for pairwise comparison of the groups at a 95% confidence level. Results: Both AH Plus and MTA Fillapex exhibited higher bond strength in the laser-treated canals. AH plus exhibited superior bond strength compared to MTA Fillapex in both laser and non-laser-treated groups (P < 0.05). AH Plus groups have predominantly presented cohesive failure whereas MTA Fillapex presented mixed failures. Conclusion: Irradiation with Er:YAG laser in the root canal before obturation improves the bond strength significantly. The adhesive properties of MTA Fillapex are comparable to that of AH Plus.

scholarly journals Acid resistance of dental enamel treated with remineralizing agents, Er:YAG laser and combined treatments

2018 ◽  
Vol 55 (3) ◽  
pp. 255-259 ◽  
Author(s):  
Alma Ceballos-Jiménez ◽  
Laura Rodríguez-Vilchis ◽  
Rosalía Contreras-Bulnes ◽  
Jesús Arenas Alatorre ◽  
Ulises Velazquez-Enriquez ◽  
...  
Keyword(s):  
Er:Yag Laser ◽  
Dental Enamel ◽  
Acid Resistance ◽  
Combined Treatments
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