Effect of CO   2    laser on dentinal bonding

Dederich, Douglas N.; Hinkelman, Kenneth W.; Albert, Andrew; Tulip, J.

doi:10.1117/12.17488

Cited by 3 publications

(4 citation statements)

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“…It has been suggested that lasers might also be used to produce an etched surface [1][2][3][4][5][6][7][8][9][10][11][12][13]. Although initially limited mainly to the Nd:YAG or carbon dioxide lasers, workers have begun investigating the ability of the erbium:YAG (Er:YAG) laser to produce an etched surface [9,10].…”

Section: Introductionmentioning

confidence: 99%

“…Several methods have been applied when evaluating bonding systems in vitro such as the measurement of the peak shear bonding forces [3,6,7,10,11], or in some studies the peak tensile bonding forces [1,9,12], histological appraisal of the prepared surface [2,3,10,11,13,15] and more recently profilometric analysis [11]. Of these, probably the most widely applied are the peak shear bonding test and some form of histological appraisal.…”

Section: Introductionmentioning

confidence: 99%

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Er:YAG (λ=2.94 µm) Laser Etching of Dental Enamel as an Alternative to Acid Etching

et al. 2000

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Acid etching is widely used in clinical dentistry to facilitate the mechanical retention of resin-based materials to teeth, in particular enamel surfaces. Several laser systems have been developed with the aim of modifying dental hard tissues and the Er:YAG ( =2.94 m) laser may o#er a possible alternative to the acid etching technique.This study compares the shear bond strengths of composite beads attached to sound enamel surfaces prepared using either (a) no etching (negative control), (b) acid etching (positive control) or (c) Er:YAG laser etching, either with or without water, at one of three fluences: 15 J/cm 2 , 18 J/cm 2 or 24 J/cm 2 . A histological appraisal was also conducted using environmental scanning electron microscopy (ESEM) techniques.The mean shear bond strength for acid-etched enamel was 16.6 MPa (SD 4.4, n=10), whereas the best laser-etched mean bond strength obtained was 11.5 MPa (SD 4.1, n=11) using a fluence of 24 J/cm 2 with water. These values were significantly greater than those obtained for the negative control (no etching) of 4.4 MPa (SD 0.9, n=8). There was a significant positive correlation between the etching fluence and the shear bond strength, but pitting of the enamel surface at fluences above 25 J/cm 2 limited the maximum fluence for etching purposes. Although Er:YAG laser etching enhanced the retention of a resin-based material to an enamel surface when compared to a negative control, the mean shear bond strengths were significantly lower than those obtained using conventional acid etching. The optimal laser etching parameters in this study were shown to be 24 J/cm 2 in conjunction with water.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Er:YAG (λ=2.94 µm) Laser Etching of Dental Enamel as an Alternative to Acid Etching

et al. 2000

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“…Several investigators have reported enhanced dentinal bonding with composite materials after laser pre-treatment using the CO2 laser; these effects are primarily attributed to changes in dentin surface morphology which enhance micro-interdigitation and retention (36,40). However, routine clinical use of the CO 2 laser would require precise control of irradiation procedures to ensure a homogeneous effect whilst avoiding the sequellae of excessive heat generation.…”

Section: Discussionmentioning

confidence: 99%

“…Several researchers have investigated the use of lasers for intentional modification of tooth surfaces to improve the tooth surface restoration interface. In these studies, lasers were usually used solely for surface treatment after conventional cavity preparation (32)(33)(34)(35)(36)(37)(38)(39)(40)(41). Most of these investigations were performed using fairly long-pulsed or continuous wave Nd-YAG or CO 2 lasers, which would tend to induce significant temperature increases during irradiation, giving rise to concerns about pulpal tolerance of such procedures.…”

Section: Introductionmentioning

confidence: 99%

Effects of cavity preparation using a nanosecond-pulsed Nd-YAG laser on tooth-restoration interface

et al. 1997

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This study evaluated the tooth-restoration interface between composite resin or glass ionomer cement and the tooth surface in teeth where caries removal and cavity preparation were performed either with the dental drill, the dental drill and laser irradiation, or laser irradiation alone. A nanosecond-pulsed Nd-YAG laser was used at energy densities of 2-8 J cm-2. After tooth restoration, microleakage tests were performed using methylene blue. Using general linear model procedures, no significant differences in microleakage were determined between 'drill' and 'drill and laser'-prepared groups (p<0.01) in resin-and in glass-ionomer-restored teeth. These specimens showed significantly less dye penetration than the 'laser only' group (p<0.0001). No correlation was found between fluence and microleakage using either restorative material (p=0.8). Dye penetration was significantly greater in the composite-filled than in the glass-ionomer group (p<0.05). Mechanisms influencing laser effects on bonding require further investigation before clinical application of lasers as an alternative to the dental drill can become viable.

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Shear Strength of Composite Bonded to Er:YAG Laser-prepared Dentin

et al. 1996

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An Er:YAG laser coupled with a cooling stream of water effectively removes dental hard tissues. However, before such a system can be deemed clinically viable, some safety and efficacy issues must be addressed. We compared the bonding of composite to dentin following the preparation of the dentinal surface with either an Er:YAG laser (lambda = 2.94 microns) or a standard dental bur and with and without a subsequent acid-etching treatment. The crowns of extracted human molars were removed, revealing the underlying dentin. We removed an additional thickness of material with either a dental handpiece or an Er:YAG laser (350 mJ/pulse at 6 Hz) by raster-scanning the samples under a fixed handpiece or laser. Comparable surface roughnesses were obtained. Several samples from each group received an acid-conditioning treatment. A cylinder of composite was bonded onto the prepared surfaces. The dentin-composite bond was then shear-stressed to failure on a universal testing apparatus. The results indicate that laser-irradiated samples had improved bond strengths compared with acid-etched and handpiece controls. SEM photographs of the surfaces show exposed tubules following the laser treatment: tubules could also be exposed with acid etching. We conclude that Er:YAG laser preparation of dentin leaves a suitable surface for strong bonding or an applied composite material.

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Effect of CO 2 laser on dentinal bonding

Cited by 3 publications

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Er:YAG (λ=2.94 µm) Laser Etching of Dental Enamel as an Alternative to Acid Etching

Er:YAG (λ=2.94 µm) Laser Etching of Dental Enamel as an Alternative to Acid Etching

Effects of cavity preparation using a nanosecond-pulsed Nd-YAG laser on tooth-restoration interface

Shear Strength of Composite Bonded to Er:YAG Laser-prepared Dentin

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