Surface morphology, elemental distribution, and spectroscopic changes subsequent the application of nanosecond pulsed Nd:YAG laser on dental enamel surface

2005 ◽  
Vol 2 (3) ◽  
pp. 141-147 ◽  
Author(s):  
A Antunes ◽  
S S Vianna ◽  
A S L Gomes ◽  
W de Rossi ◽  
D M Zezell
Keyword(s):  
Surface Morphology ◽  
Nd:Yag Laser ◽  
Dental Enamel ◽  
Enamel Surface ◽  
Elemental Distribution ◽  
Pulsed Nd:Yag Laser

Effects of Pulsed Nd:YAG Laser on Tensile Bond Strength and Caries Resistance of Human Enamel

2014 ◽  
Vol 39 (3) ◽  
pp. 273-282 ◽  
Author(s):  
X Wen ◽  
L Zhang ◽  
R Liu ◽  
M Deng ◽  
Y Wang ◽  
...  
Keyword(s):  
Phosphoric Acid ◽  
Bond Strength ◽  
Nd:Yag Laser ◽  
Acid Resistance ◽  
Enamel Surface ◽  
Acid Etching ◽  
Laser Parameter ◽  
Pulsed Nd:Yag Laser ◽  
Resistance Evaluation ◽  
Human Enamel

SUMMARY This study aims to evaluate the effects of pulsed Nd:YAG laser on the tensile bond strength (TBS) of resin to human enamel and caries resistance of human enamel. A total of 201 human premolars were used in this in vitro study. A flat enamel surface greater than 4 × 4 mm in area was prepared on each specimen using a low-speed cutting machine under a water coolant. Twenty-one specimens were divided into seven groups for morphology observations with no treatment, 35% phosphoric acid etching (30 seconds), and laser irradiation (30 seconds) of pulsed Nd:YAG laser with five different laser-parameter combinations. Another 100 specimens were used for TBS testing. They were embedded in self-cured acrylic resin and randomly divided into 10 groups. After enamel surface pretreatments according to the group design, resin was applied. The TBS values were tested using a universal testing machine. The other 80 specimens were randomly divided into eight groups for acid resistance evaluation. Scanning electron microscope (SEM) results showed that the enamel surfaces treated with 1.5 W/20 Hz and 2.0 W/20 Hz showed more etching-like appearance than those with other laser-parameter combinations. The laser-parameter combinations of 1.5 W/15 Hz and 1.5 W/20 Hz were found to be efficient for the TBS test. The mean TBS value of 14.45 ± 1.67 MPa in the laser irradiated group was significantly higher than that in the untreated group (3.48 ± 0.35 MPa) but lower than that in the 35% phosphoric acid group (21.50 ± 3.02 MPa). The highest mean TBS value of 26.64 ± 5.22 MPa was identified in the combination group (laser irradiation and then acid etching). Acid resistance evaluation showed that the pulsed Nd:YAG laser was efficient in preventing enamel demineralization. The SEM results of the fractured enamel surfaces, resin/enamel interfaces, and demineralization depths were consistent with those of the TBS test and the acid resistance evaluation. Pulsed Nd:YAG laser as an enamel surface pretreatment method presents a potential clinical application, especially for the caries-susceptible population or individuals with recently bleached teeth.

scholarly journals MORPHOLOGY AND COMPOSITION ANALYSIS OF ENAMEL SURFACE WITH DENTAL ADHESIVE FOLLOWING THE APPLICATION OF ND:YAG ABLATION

2020 ◽  
Vol 82 (6) ◽  
pp. 63-70
Author(s):  
Fatanah Mohamad Suhaimi ◽  
Nurul Atiqah A. Razak ◽  
Nur Syazana Azizan ◽  
Mohd Aizat Abu Bakar ◽  
Mohammad Khairul Azhar Abdul Razab ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Elemental Composition ◽  
Nd:Yag Laser ◽  
Laser Energy ◽  
Morphological Changes ◽  
Energy Parameter ◽  
Enamel Surface ◽  
Tooth Surface ◽  
Composition Analysis ◽  
Healthy Human

Nd:YAG laser with a wavelength of 1064 nm has been used for various applications in dentistry, including for soft tissue and hard tissue applications. This study aimed to investigate the changes in morphological structures and elemental composition of enamel surface after composite removal using energy variations of Nd:YAG laser. 12 healthy human premolar teeth were cut into half, and Blūgloo adhesives were applied to the tooth surface. The samples were subjected to Nd:YAG laser irradiations with three different energy parameters, 510 mJ, 540 mJ, and 580 mJ. The changes in enamel surface morphology and composition of elements were analyzed using Field Emission Scanning Electron Microscopy (FESEM) and Energy Dispersive X-Ray (EDX). Surface morphology indicates that 540 mJ can potentially be used for composite adhesives removal. For the elemental composition, carbon, phosphorus, and calcium were statistically significant between samples without composite, after bracket debonding, and after laser irradiation. Several morphological changes may occur on the enamel surface after samples were irradiated with a laser. Energy parameter of the laser plays a vital role towards the desired surface. In this study, 540 mJ is seen to be potential for material removal process on the enamel surface.

scholarly journals COMPARATIVE STUDY OF THE SHEAR BOND STRENGTH OF COMPOSITE RESIN TO DENTAL ENAMEL CONDITIONED WITH PHOSPHORIC ACID OR Nd: YAG LASER

1997 ◽  
Vol 11 (4) ◽  
pp. 245-248 ◽  
Author(s):  
Carlos de Paula EDUARDO ◽  
Wilson Tavares de OLIVEIRA JUNIOR ◽  
Silvio Issáo MYAKI ◽  
Denise Maria ZEZELL
Keyword(s):  
Phosphoric Acid ◽  
Bond Strength ◽  
Nd:Yag Laser ◽  
Shear Bond Strength ◽  
Composite Resin ◽  
Dental Enamel ◽  
Treated Group ◽  
Composite Resins ◽  
Enamel Surface ◽  
Student’S T

This study has been focused on a comparison between the shear bond strength of a composite resin attached to dental enamel surface, after a 35% phosphoric acid etching and after a Nd:YAG laser irradiation with 165.8 J/cm2 of energy density per pulse. After etching and attaching resin to these surfaces, the specimens were thermocycled and then underwent the shearing bond strength tests at a speed of 5 mm/min. The results achieved, after statistical analysis with Student's t-test, showed that the adhesion was significantly greater in the 35% phosphoric acid treated group than in the group treated with the Nd:YAG laser, thus demonstrating the need for developing new studies to reach the ideal parameters for an effective enamel surface conditioning as well as specific adhesives and composite resins when Nd:YAG laser is used

scholarly journals Modification of Enamel Surface Morphology and Strength Using Nd:YAG Laser with Proper and Safe Parameters

2021 ◽  
Author(s):  
Amera Alkaisi ◽  
Salma B.A. Abdo
Keyword(s):  
Surface Morphology ◽  
Nd:Yag Laser ◽  
Laser Pulses ◽  
Enamel Surface ◽  
Nanosecond Laser ◽  
Laser Exposure ◽  
Significant Difference ◽  
Nanosecond Laser Pulses ◽  
Group 2 ◽  
Post Hoc

Abstract Objective The aim of this study was to determine the effect of a Nd:YAG laser on enamel surface morphology and hardness using different energies and pulses. Materials and Methods Twenty freshly extracted mature teeth were collected and sectioned. An Nd:YAG laser operating at 1,064 nm wavelength and providing up to 9 nanosecond laser pulses (1 J), with a laser spot diameter of 0.8 mm and irradiated surface area of 3 × 3 mm2, was applied to carbon black-coated teeth. The samples were randomly divided into two main groups; each group comprised 20 samples, according to the treatment parameters. The first group was further divided into subgroups A, B1, C1, and D1 using the different energies of 0, 350, 450, and 550 mJ, respectively, with 1 pulse for B1, C1, and D1. The second group was subdivided into A, B2, C2, and D2 and treated with 200 mJ, 3, 4, and 6 pulses for subgroups B2, C2 and D2, respectively. Subgroup A was the same sample for both groups as control with 0 pulses and 0 energy. Morphological features and microhardness were evaluated after laser exposure. Statistical Analysis Analysis of variance (Kruskal–Wallis test) was used to compare all subgroups, followed by the Scheefy significant difference post hoc test to determine the highest significance of the subgroups. Alpha < 0.05 was set as significant. Results The changes in the surface morphology of the enamel included increased crystal sizes, cracks, fissures, and voids with increasing energies and pulses. In group 1, the microhardness was 405.6, 562.7, 612, and 637 for energies of 0, 350, 450, and 550 mJ, respectively. In group 2, the microhardness was 405.6, 673, 866, and 1,050 for 0, 3, 4, and 6 pulses, respectively. Conclusion The Nd:YAG laser is efficient for increasing the microhardness of the enamel surface with minimum morphological damage by applying low energy with more pulses.

Effects of 445-nm Diode Laser-Assisted Debonding of Metallic Brackets on Shear Bond Strength and Enamel Surface Morphology

2020 ◽  
Vol 38 (3) ◽  
pp. 160-166 ◽  
Author(s):  
Thomas Knaup ◽  
Heike Korbmacher-Steiner ◽  
Andreas Braun ◽  
Johannes-Simon Wenzler ◽  
Isabel Knaup ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Bond Strength ◽  
Diode Laser ◽  
Shear Bond Strength ◽  
Enamel Surface
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