Selective removal of dental composite with a diode-pumped Er:YAG laser

Fried, William; Chan, Kenneth H.; Darling, Cynthia L.; Fried, Daniel

doi:10.1117/12.2218645

Cited by 9 publications

(3 citation statements)

References 29 publications

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“…The characterization of the transmission behavior of dental materials for different laser wavelengths, as performed in the study at hand, forms the basis for the development of some new laser applications. An example for such applications is the selective removal of a filling material, for example, in case of a defective filling, without harming the tooth substance below . The filling material should exhibit very high transmission for a specific laser wavelength.…”

Section: Discussionmentioning

confidence: 99%

Characterization of the transmission behavior of dental filling materials and cements for the diode lasers’ and the Nd:YAG laser's wavelengths

et al. 2019

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Objectives Diode lasers and the Nd:YAG laser are used in periodontal therapy and soft tissue surgery. Dental filling materials or cements might be inadvertently damaged. The underlying mechanism of the damage is based on the dental material's specific transmission and thus absorption behavior. Materials and Methods Twenty‐four material representatives for composites, glass ionomer cements and other material classes (e.g., compomer) were processed to 100 μm and 200 μm planar specimens and spectroscopically measured for their collimated transmission in the photo spectrometer Varian Cary 5000. The (1) mean intensity of transmitted light was determined for the laser wavelengths of interest (810 nm, 940 nm, 980 nm, 1,064 nm) and used to calculate the (2) absorption lengths. Results The (1) mean intensity of transmitted light ranged between 9.51 % (Panavia F 2.0 for 810 nm) and 96.79% (Artegral Cem for 1,064 nm) for the composite specimens (100 μm) and was—with few exceptions—near zero for the representatives of glass ionomer cement and the other material classes. The (2) absorption lengths were between 0.06 mm (Panavia F 2.0 for all wavelengths of interest) and 1.33 mm (Coltène Duo Cement Plus for 1,064 nm) for the composites and below or equal 0.15 mm (PermaCem for 1,064 nm) for the few representatives of glass ionomer cements and the other material classes with mean intensities of transmitted light, which were not near zero and thus permitted to calculate absorption lengths. Conclusions The transmission behavior varied between the different material classes and even within, albeit less pronounced. Composites generally showed the highest intensities of transmitted light and are thus least susceptible to surface damage by laser light (810 nm, 940 nm, 980 nm, 1,064 nm). The results can be used to improve and develop laser applications involving purposeful interactions between laser light and dental materials. Lasers Surg. Med. © 2019 Wiley Periodicals, Inc.

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Section: Discussionmentioning

confidence: 99%

Characterization of the transmission behavior of dental filling materials and cements for the diode lasers’ and the Nd:YAG laser's wavelengths

et al. 2019

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“…Several studies have been published regarding the use of lasers to remove composite from tooth surfaces. [4][5][6][7][8][9][10][11][12][13][14][15] Studies investigating CO 2 lasers for the uses of removing either composite, enamel and dentin found that it can be accomplished with minimal impact to the pulp if operated at 9.3 and 9.6-μm wavelengths. A clinical study investigating the pulpal response to the same carbon dioxide laser used in this study demonstrated that the laser can be used safely to ablate enamel without pulpal damage.…”

Section: Introductionmentioning

confidence: 99%

In vivo spectral guided removal of composite from tooth surfaces with a CO2 laser

Simon

Choi

Jang

et al. 2020

Lasers in Dentistry XXVI

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Dental composites are used as restorative materials to replace tooth structure after the removal of caries, shaping, covering teeth for esthetic purposes and as adhesives. Dentists spend more time replacing existing restorations that fail than they do placing new restorations. Tooth colored restorations are difficult to differentiate from the surrounding tooth structure making them challenging to remove completely without incidental removal of healthy tooth structure. Previous studies have demonstrated that CO 2 lasers in conjunction with spectral feedback can be used to selectively remove composite from tooth surfaces. In addition, we assembled a system feasible for clinical use that incorporates a spectral feedback system, scanning system, articulating arm and a clinical handpiece and subsequently evaluated the performance of that system on extracted teeth. The purpose of this study was to test this system in vivo to demonstrate its efficacy relative to dental clinicians. Eight test subjects with premolar teeth scheduled for extraction for orthodontic reasons had bilateral premolars prepared with small occlusal cavity preparations and filled with dental composite. The laser scanning system was used to remove the composite from one of the preparations and a dental handpiece was used to remove the composite from the other. Cross polarization optical coherence tomography was used to measure the volume of the preparation before and after composite placement and removal. There was no significant difference in the loss of enamel and residual composite between the laser and the handpiece. This study demonstrated that a computer controlled spectral guided CO 2 laser scanning system can be used in vivo to selectively remove composite from tooth surfaces.

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“…Diode pumped solid-state (DPSS) Er:YAG lasers are now available operating with pulse repetition rates as high as 1-2 kHz and initial studies have been carried out demonstrating their utility for the ablation of dental hard tissues and bone [22][23][24]. We have explored using this system for the removal of dental caries and composites [25][26][27].…”

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confidence: 99%

Use of a DPSS Er:YAG laser for the selective removal of composite from tooth surfaces

Fried

Chan

Darling

et al. 2018

Biomed. Opt. Express

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New diode-pumped solid state (DPSS) Er:YAG lasers have become available operating at high pulse repetition rates. These lasers are ideally suited for integration with laser scanning systems for the selective removal of dental decay and composite restorative materials from tooth surfaces. The purpose of this study was to determine if a DPSS Er:YAG laser system is suitable for the selective removal of composite from tooth surfaces. Relative ablation rates of composite and enamel were determined and composite was removed from tooth surfaces using a DPSS Er:YAG laser. Composite was removed very rapidly with ablation rates approaching 50-µm per pulse. A fluence of ~50 J/cm 2 appeared optimal for the removal of composite and damage to the enamel was limited to less than 100-µm after the removal of composite as thick as 700-800-µm; however, dentin is removed at similar rates to composite. The DPSS Er:YAG laser appears to be better suited for the removal of composite than conventional flash-lamp pumped Er:YAG lasers since composite is ablated at higher rates than dental enamel and the high pulse repetition rates enable greater selectivity while maintaining high removal rates.

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Selective removal of dental composite with a diode-pumped Er:YAG laser

Cited by 9 publications

References 29 publications

Characterization of the transmission behavior of dental filling materials and cements for the diode lasers’ and the Nd:YAG laser's wavelengths

Characterization of the transmission behavior of dental filling materials and cements for the diode lasers’ and the Nd:YAG laser's wavelengths

In vivo spectral guided removal of composite from tooth surfaces with a CO2 laser

Use of a DPSS Er:YAG laser for the selective removal of composite from tooth surfaces

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