Energy output reduction and surface alteration of quartz and sapphire tips following Er:YAG laser contact irradiation for tooth enamel ablation

2009 ◽  
Vol 41 (8) ◽  
pp. 595-604 ◽  
Author(s):  
Toru Eguro ◽  
Akira Aoki ◽  
Toru Maeda ◽  
Aristeo Atsushi Takasaki ◽  
Mitsuru Hasegawa ◽  
...  
Keyword(s):  
Er:Yag Laser ◽  
Tooth Enamel ◽  
Energy Output ◽  
Surface Alteration

scholarly journals Energy output reduction and surface alteration of quartz tips following Er:YAG laser contact irradiation on soft and hard tissues in vitro

2016 ◽  
Vol 35 (1) ◽  
pp. 51-62 ◽  
Author(s):  
Taichen LIN ◽  
Rie KAWAMURA ◽  
Akira AOKI ◽  
Shizuko ICHINOSE ◽  
Koji MIZUTANI ◽  
...  
Keyword(s):  
Er:Yag Laser ◽  
Energy Output ◽  
Hard Tissues ◽  
Surface Alteration

Adhesive Evaluation by Brushing Tests for Hydroxyapatite Films Fabricated on Dentins Using a Water Mist Assisted Er:YAG Laser Deposition Method

2017 ◽  
Vol 758 ◽  
pp. 97-104
Author(s):  
Ei Yamamoto ◽  
Nobuhiro Kato ◽  
Shigeki Hontsu
Keyword(s):  
Yttrium Aluminum Garnet ◽  
Er:Yag Laser ◽  
Tooth Enamel ◽  
Artificial Saliva ◽  
Water Mist ◽  
Laser Deposition ◽  
Deposition Method ◽  
Dentin Surface ◽  
Restoration Technique ◽  
Tooth Surfaces

Hydroxyapatite (HAp) is one of the main structural components in tooth. Therefore, the HAp is an ideal material to repair tooth substances. However, it has not yet been realized that tooth enamel and dentin are artificially repaired using the HAp in operative dentistry. We have proposed and developed a tooth restoration technique with intraoral laser ablation using an Er:YAG (Erbium: Yttrium-Aluminum-Garnet) laser in order to fabricate HAp films on tooth surfaces in the atmosphere at room temperature. Although HAp thin films were formed on dentin surfaces using the Er:YAG laser deposition method, it has still been unclear how is the mechanical durability of the HAp film on tooth substances. In the present study, we conducted brushing tests to evaluate the durability of adhesion between the HAp film and dentin. To form HAp layers on dentin surfaces, an ablation phenomenon was induced by the Er:YAG laser irradiated to the target of α-tricalcium phosphate (α-TCP) under humid conditions. The deposited layers were hydrolyzed by dripping artificial saliva on the surface at 37 degrees Celsius for 24, 48, 72, 120, and 168 hours to create HAp films. The films hydrolyzed for more than 48 hours were attached on the dentin surface after the brushing tests. This result indicates that the α-TCP layer deposited on the dentin surface changes into a crystallized HAp material by the hydrolyzation for more than 48 hours. The crystallization of the film possibly contributes to the high adhesive durability of the HAp film deposited on the dentin.

scholarly journals In VitroEffects of Two Topical Varnish Materials and Er:YAG Laser Irradiation on Enamel Demineralization around Orthodontic Brackets

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Feyza Ulkur ◽  
Elif Sungurtekin Ekçi ◽  
Didem Nalbantgil ◽  
Nuket Sandalli
Keyword(s):  
Laser Irradiation ◽  
Er:Yag Laser ◽  
Orthodontic Brackets ◽  
Energy Output ◽  
Surface Microhardness ◽  
Sem Images ◽  
Treatment Groups ◽  
Enamel Demineralization ◽  
Group 1

The aim of thisin vitrowas to evaluate the effects of tricalcium phosphate (TCP) and amorphous calcium phosphate (ACP) containing varnish materials and Er:YAG laser irradiation on enamel demineralization around orthodontic brackets. Forty extracted human premolar teeth were randomly divided into four treatment groups (i.e., 10 in each group): (1) 5% NaF-ACP varnish, (2) 5% NaF-TCP varnish, (3) Er:YAG laser, and (4) control (no treatment). Er:YAG laser was operated at a wavelength of 2.94 μm and the energy output was 80 mJ per pulse; a pulse duration of 200 μsec and and a frequency of 2 Hz were used with water cooling. All samples were then put into pH cycles. Surface microhardness values and representative SEM images were assessed. Surface microhardness values were evaluated using Kruskal-Wallis and Mann-WhitneyUtests. The results revealed that demineralization was significantly lower in the TCP and ACP varnish groups, whereas mean surface microhardness values of the TCP varnish were found higher than the ACP(P<0.05). TCP and ACP varnish materials were found effective for reducing enamel demineralization around orthodontic brackets. Use of Er:YAG laser irradiation as described in this study for inhibition of demineralization was found not satisfactory.

Surface alteration of human tooth enamel subjected to acidic and neutral 30% hydrogen peroxide

2011 ◽  
Vol 39 (10) ◽  
pp. 686-692 ◽  
Author(s):  
Lili Sun ◽  
Shanshan Liang ◽  
Yue Sa ◽  
Zhejun Wang ◽  
Xiao Ma ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Tooth Enamel ◽  
Human Tooth ◽  
Human Tooth Enamel ◽  
Surface Alteration

Adhesion Properties of an Apatite Film Deposited on Dentine Using Er:YAG Laser Ablation Method

2016 ◽  
Vol 696 ◽  
pp. 69-73 ◽  
Author(s):  
Ei Yamamoto ◽  
Nobuhiro Kato ◽  
Kazushi Yoshikawa ◽  
Kenzo Yasuo ◽  
Kazuyo Yamamoto ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Adhesive Strength ◽  
Yttrium Aluminum Garnet ◽  
Dental Treatment ◽  
Er:Yag Laser ◽  
Tooth Enamel ◽  
Pure Water ◽  
Adhesion Properties ◽  
Laser Ablation Method ◽  
Restoration Technique

Tooth enamel cannot be naturally reconstructed once it is destroyed immoderately. Therefore, the restoration of enamel is important in dental treatment. Hydroxyapatite (HAp) can potentially be used for a novel dental biomaterial to repair the enamel. We have proposed a tooth restoration technique with intraoral laser ablation method. A thin layer of HAp was deposited on dentin surface in the atmosphere by ablation phenomenon using an Er:YAG (Erbium: Yttrium-Aluminum-Garnet) laser irradiated to the target of α-tricalcium phosphate (α-TCP). Then, the deposited layer was hydrolyzed by dripping pure water on its surface in order to create HAp film. The adhesive strength between the HAp film and dentin was evaluated by quasi-static tensile tests. As a result of the mechanical evaluation, the adhesive strength was greater than approximately 3.8 MPa. It is clear that the HAp film created by the Er:YAG laser ablation method is attached tightly to the dentin.

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

2013 ◽  
Vol 24 (4) ◽  
pp. 330-334 ◽  
Author(s):  
Maria Cristina Borsatto ◽  
Mayara Garcia Martinelli ◽  
Marta Maria Martins Giamatei Contente ◽  
Talitha de Siqueira Mellara ◽  
Jesus Djalma Pecora ◽  
...  
Keyword(s):  
Shear Bond Strength ◽  
Composite Resin ◽  
Er:Yag Laser ◽  
Tooth Enamel ◽  
Water Storage ◽  
Adhesive System ◽  
Primary Tooth ◽  
Cavity Preparation ◽  
Etch And Rinse

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.

Effects of Er:YAG Laser Treatment on the Mineral Content and Morphology of Primary Tooth Enamel

2018 ◽  
Vol 36 (12) ◽  
pp. 680-686
Author(s):  
Firdevs Kahvecioglu ◽  
Kamil Kahraman ◽  
Hayri Akman ◽  
Gül Tosun
Keyword(s):  
Laser Treatment ◽  
Mineral Content ◽  
Er:Yag Laser ◽  
Tooth Enamel ◽  
Primary Tooth

scholarly journals Altered adhesion of dental sealant to tooth enamel microscopically modified by Er:YAG laser irradiation: An in vitro study

LASER THERAPY ◽  
2019 ◽  
Vol 28 (1) ◽  
pp. 19-25 ◽  
Author(s):  
Anoma Rattanacharoenthum ◽  
Na-Lamphun Prisana ◽  
Nutthapong Kantrong
Keyword(s):  
Laser Irradiation ◽  
Er:Yag Laser ◽  
Tooth Enamel ◽  
Dental Sealant

A procedure for cross-sectioning materials for TEM analysis without ion milling

1990 ◽  
Vol 48 (4) ◽  
pp. 742-743
Author(s):  
J.P. Benedict ◽  
Ron Anderson ◽  
S. J. Klepeis
Keyword(s):  
Surface Topography ◽  
Milling Time ◽  
Specimen Preparation ◽  
Ion Milling ◽  
Cleaning Operation ◽  
Tem Analysis ◽  
Platinum Silicide ◽  
Surface Alteration ◽  
Polishing Damage ◽  
Tools And Methods

Traditional specimen preparation procedures for non-biological samples, especially cross section preparation procedures, involves subjecting the specimen to ion milling for times ranging from minutes to tens of hours. Long ion milling time produces surface alteration, atomic number and rough-surface topography artifacts, and high temperatures. The introduction of new tools and methods in this laboratory improved our ability to mechanically thin specimens to a point where ion milling time was reduced to one to ten minutes. Very short ion milling times meant that ion milling was more of a cleaning operation than a thinning operation. The preferential thinning and the surface topography that still existed in briefly ion milled samples made the study of interfaces between materials such as platinum silicide and silicon difficult. These two problems can be eliminated by completely eliminating the ion milling step and mechanically polishing the sample to TEM transparency with the procedure outlined in this communication. Previous successful efforts leading to mechanically thinned specimens have shown that problems center on tool tilt control, removal of polishing damage, and specimen cleanliness.

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