Conditioning of Enamel with Nd:YAG and CO2 Dental Laser Systems and with Phosphoric Acid An In-Vitro Comparison of the Tensile Bond Strength and the Morphology of the Enamel Surface

2001 ◽  
Vol 62 (5) ◽  
pp. 375-386 ◽  
Author(s):  
Robert Fuhrmann ◽  
Norbert Gutknecht ◽  
Andreas Magunski ◽  
Friedrich Lampert ◽  
Peter Diedrich
Keyword(s):  
Phosphoric Acid ◽  
Bond Strength ◽  
Enamel Surface ◽  
Tensile Bond Strength ◽  
Laser Systems ◽  
Dental Laser ◽  
In Vitro Comparison

scholarly journals In vitro comparison of the tensile bond strength of denture adhesives on denture bases

2013 ◽  
Vol 110 (6) ◽  
pp. 488-493 ◽  
Author(s):  
Doris R. Kore ◽  
Mathew T. Kattadiyil ◽  
Dan B. Hall ◽  
Khaled Bahjri
Keyword(s):  
Bond Strength ◽  
Tensile Bond Strength ◽  
Denture Adhesives ◽  
In Vitro Comparison

scholarly journals Tensile bond strength and SEM analysis of enamel etched with Er:YAG laser and phosphoric acid: a comparative study In vitro

2008 ◽  
Vol 19 (1) ◽  
pp. 57-61 ◽  
Author(s):  
Luis H. Sasaki ◽  
Paulo D. C. Lobo ◽  
Yumi Moriyama ◽  
Ii-Sei Watanabe ◽  
Antonio B. Villaverde ◽  
...  
Keyword(s):  
Phosphoric Acid ◽  
Bond Strength ◽  
Er:Yag Laser ◽  
Morphological Changes ◽  
Sem Analysis ◽  
Tensile Bond Strength ◽  
Human Enamel ◽  
Morphological Differences ◽  
Phosphoric Acid Etching

Er:YAG laser has been studied as a potential tool for restorative dentistry due to its ability to selectively remove oral hard tissue with minimal or no thermal damage to the surrounding tissues. The purpose of this study was to evaluate in vitro the tensile bond strength (TBS) of an adhesive/composite resin system to human enamel surfaces treated with 37% phosphoric acid, Er:YAG laser (lambda=2.94 mum) with a total energy of 16 J (80 mJ/pulse, 2Hz, 200 pulses, 250 ms pulse width), and Er:YAG laser followed by phosphoric acid etching. Analysis of the treated surfaces was performed by scanning electron microscopy (SEM) to assess morphological differences among the groups. TBS means (in MPa) were as follows: Er:YAG laser + acid (11.7 MPa) > acid (8.2 MPa) > Er:YAG laser (6.1 MPa), with the group treated with laser+acid being significantly from the other groups (p=0.0006 and p= 0.00019, respectively). The groups treated with acid alone and laser alone were significantly different from each other (p=0.0003). The SEM analysis revealed morphological changes that corroborate the TBS results, suggesting that the differences in TBS means among the groups are related to the different etching patterns produced by each type of surface treatment. The findings of this study indicate that the association between Er:YAG laser and phosphoric acid can be used as a valuable resource to increase bond strength to laser-prepared enamel.

scholarly journals A comparative study of the microtensile bond strength and microstructural differences between sclerotic and Normal dentine after surface pretreatment

2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Jinhua Wang ◽  
Weijian Song ◽  
Lei Zhu ◽  
Xin Wei
Keyword(s):  
Phosphoric Acid ◽  
Bond Strength ◽  
Sodium Hypochlorite ◽  
Resin Composite ◽  
The Other ◽  
Tensile Bond Strength ◽  
Strength Analysis ◽  
Class Iii ◽  
Surface Pretreatment ◽  
Dentine Surface

Abstract Background The resin bond strength of sclerotic dentine is significantly lower than that of the normal dentine, which paused a challenge for bonding procedures clinically. The aim of this study was to compare the effects of different surface pretreatments on the micro-tensile bond strength and microstructure between sclerotic dentine and normal dentine. Methods Eighty teeth that were collected, forty premolars with typical wedge-shaped defects visually graded as class III were assigned as the sclerotic dentine group (SD), the other forty normal premolars with artificial wedge-shaped defects were assigned as the normal dentine group (ND). Each group was randomly subdivided into eight subgroups according to the solution used: 35% phosphoric acid, 15% EDTA, 5% or 10% NaClO. Then the dentine surface was examined using a scanning electron microscope (SEM). The lesions were restored using self-etching adhesive and the subsequent resin composite. The teeth were sectioned into sticks for the micro-tensile bond strength analysis, and the data were analysed using the SPSS17.0 software package (α = 0.05). Results First, for the ND groups, after pretreatment using 35% phosphoric acid, and 35% phosphoric acid + 5% or 10% sodium hypochlorite, the bonding strengths of the normal dentine were higher than that of the other groups (P < 0.05). Second, for the SD groups, after pretreatment using 35% phosphoric acid, 15% EDTA, and 35% phosphoric acid + 5% or 10% sodium hypochlorite, the bonding strengths of the sclerotic dentine were higher than that of the other groups (P < 0.05). Third, the bond strengths of the sclerotic dentine were lower than that of the normal dentine without any pretreatment (P < 0.05). After pretreatment using 35% phosphoric acid + 5% or 10% sodium hypochlorite, the bonding strengths of the sclerotic dentine were higher than that of the normal dentine (P < 0.05). SEM observation showed that the appearances of dentine surface were changed after pretreatment using the above solutions, with the reduced smear layer, opened small groove and increased dentinal tubules. Conclusion Pretreatment of dentine using 35% phosphoric acid+ 5% or + 10% sodium hypochlorite changed the microstructure of the sclerotic dentine surface and subsequently increased the micro-tensile bond strength.

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.

In vitro tensile bond strength of reconditioned brackets

1985 ◽  
Vol 87 (3) ◽  
pp. 247-252 ◽  
Author(s):  
William L. Wright ◽  
John M. Powers
Keyword(s):  
Bond Strength ◽  
Tensile Bond Strength
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