Ablation of composite resins using Er:YAG laser—comparison with enamel and dentin

Lizarelli, Rosane de Fátima Zanirato; Moriyama, Lílian Tan; Bagnato, Vanderlei Salvador

doi:10.1002/lsm.10196

Cited by 63 publications

(69 citation statements)

References 4 publications

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“…All our findings show a possibility to select and control the enamel ablation using femtosecond pulsed laser, similar to the Er:YAG laser irradiation effects, which preferentially removes composite resin when compared with the enamel [23].…”

Section: Resultsmentioning

confidence: 52%

Selective ablation of dental enamel and dentin using femtosecond laser pulses

et al. 2007

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The study of the interaction of intense laser light with matter, as well as transient response of atoms and molecules is very appropriated because of the laser energy concentration in a femtosecond optical pulses. The fundamental problem to be solved is to find tools and techniques which allow us to observe and manipulate on a femtosecond time scale the photonics events on and into the matter. Six third human extracted molars were exposed to a femtosecond Ti:Sapphire Q-switched and mode locked laser (Libra-S, Coherent, Palo Alto, CA, USA), emitting pulses with 70 fs width, radiation wavelength of 801 nm, at a constant pulse repetition rate of 1 KHz. The laser was operated at different power levels (70 to 400 mW) with constant exposition time of 10 seconds, at focused and defocused mode. Enamel and dentin surfaces were evaluated concerned ablation rate and morphological aspects under scanning electron microscopic. The results in this present experiment suggest that at the focused mode and under higher average power, enamel tissues present microcavities with higher depth and very precise edges, but, while dentin shows a larger melt-flushing, lower depth and melting and solidification aspect. In conclusion, it is possible to choose hard or soft ablation, under lower and higher average power, respectively, revealing different aspects of dental enamel and dentin, depending on the average power, fluence and distance from the focal point of the ultra-short pulse laser on the tooth surface.

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Section: Resultsmentioning

confidence: 52%

Selective ablation of dental enamel and dentin using femtosecond laser pulses

et al. 2007

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“…The previous version of erbium, Er:YAG (erbium: yttrium-aluminum-garnet), was studied for effectiveness of resin matrix composite removal. 32,33 Er,Cr:YSGG lasers are generally set at the following parameters: pulse duration 140 ls, a repetition rate of 20 Hz, a power output range from 0.0 to 6.0 W, pulse energy at 0 to 300 mJ per pulse and an energy density per pulse from 0.0 to 68.02 J/cm 2 . Light delivery is through a fiberoptic system to a terminal sapphire tip with an adjustable air-water spray handpiece.…”

Section: Surface Treatmentmentioning

confidence: 99%

Effect of Er,Cr:YSGG Laser, Air Abrasion, and Silane Application on Repaired Shear Bond Strength of Composites

Cho

Rajitrangson²,

Matis

et al. 2013

Operative Dentistry

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Use of Er,Cr:YSGG (erbium, chromium: yttrium-scandium-gallium-garnet) laser does not improve the shear bond strength of the repaired resin; however, air abrasion with 50-lm aluminum oxide particles results in higher shear repair bond strength, and therefore is recommended prior to repair. Application of a silane coupling agent does not improve the shear bond strength of the repaired resin. SUMMARYAged resin composites have a limited number of carbon-carbon double bonds to adhere to a new layer of resin. Study objectives were to 1) evaluate various surface treatments on repaired shear bond strength between aged and new resin composites and 2) to assess the influence of a silane coupling agent after surface treatments.Methods: Eighty disk-shape resin composite specimens were fabricated and thermocycled 5000 times prior to surface treatment. Specimens were randomly assigned to one of the three surface treatment groups (n=20): 1) air abrasion with 50-lm aluminum oxide, 2) tribochemical silica coating (CoJet), or 3) Er,-Cr:YSGG (erbium, chromium: yttriumscandium-gallium-garnet) laser or to a notreatment control group (n=20). Specimens were etched with 35% phosphoric acid, rinsed, and dried. Each group was divided into two subgroups (n=10): A) no silanization and B) with silanization. The adhesive agent was applied and new resin composite was bonded to each conditioned surface. Shear bond strength was evaluated and data analyzed using two-way analysis of variance (ANOVA).Results: Air abrasion with 50-lm aluminum oxide showed significantly higher repair bond strength than the Er,Cr:YSGG laser and control groups. Air abrasion with 50-lm aluminum oxide was not significantly different from tribochemical silica coating. Tribochemical silica coating had significantly higher repair bond strength than Er,Cr:YSGG laser and the control. Er,Cr:YSGG laser and the control did not have significantly different repair bond strengths. Silanization had no influence on repair bond strength for any of the surface treatment methods.Conclusion: Air abrasion with 50-lm aluminum oxide and tribochemical silica followed by the application of bonding agent provided the highest repair shear bond strength values, suggesting that they might be adequate methods to improve the quality of repairs of resin composites.

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“…This laser has been experimentally shown to exhibit more effects upon adhesive resins than on enamel structure making it plausible that the laser could remove resins from tooth surfaces without significant damage to the tooth structure [26]. This study was set to explore traditional resin removal procedures in the debonding process and evaluate the Er:YAG laser as a plausible option.…”

Section: Introductionmentioning

confidence: 99%

Analysis of enamel surface roughness after different adhesive removal techniques for orthodontic bracket debonding

Palmer¹,

Mang

Tabbaa

et al. 2018

Laser Dent Sci

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Background The objectives of this study were to explore traditional resin removal procedures in the debonding process and evaluate the Er:YAG laser as a plausible option. Methods Sixty premolar teeth were bonded with brackets. Then, brackets were removed and five adhesive clean-up methods were tested against control teeth: (a) Er:YAG laser at 200 mJ and 20 Hz; (b) Er:YAG laser at 305 mJ and 10 Hz; (c) 20-fluted flame-shaped tungsten carbide bur at high-speed; (d) #8-fluted round tungsten carbide bur at low-speed; and (e) #5 round end tapered fine diamond bur at high speed. Quantitative measurements including average (Avg) profile height, total indicator run-out (TIR), arithmetic average roughness (R a ), and time were made using profilometry. Qualitative evaluation of tooth surfaces was done using SEM. Results The two laser settings produced a statistically higher TIR, R a , and time compared to the controls (P < 0.001). There was no statistical difference between the three bur techniques in regards to surface texture or time. Qualitatively, the 20-fluted carbide bur left the smoothest surface. Conclusion The Er:YAG laser at the tested settings would not be appropriate for adhesive removal. The interaction of the Er:YAG wavelength under these conditions was not comparable to the 20-fluted flame-shaped tungsten carbide bur at high speed for orthodontic adhesive removal leaving a smoother enamel surface.

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Ablation of composite resins using Er:YAG laser—comparison with enamel and dentin

Cited by 63 publications

References 4 publications

Selective ablation of dental enamel and dentin using femtosecond laser pulses

Selective ablation of dental enamel and dentin using femtosecond laser pulses

Effect of Er,Cr:YSGG Laser, Air Abrasion, and Silane Application on Repaired Shear Bond Strength of Composites

Analysis of enamel surface roughness after different adhesive removal techniques for orthodontic bracket debonding

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