&lt;title&gt;Infrared laser ablation of dental enamel: influence of an applied water layer on ablation rate and peripheral damage&lt;/title&gt;

Ashouri, Nahal; Shori, Ramesh K.; Cheung, Jason M.; Fried, Daniel

doi:10.1117/12.424498

Cited by 4 publications

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“…Therefore, one or several of the earlier suggested non-thermal ablation mechanisms, such as intense acoustic transients, or fast water jets associated with the collapse of laserinduced water bubbles, might indeed be at work here [22,[24][25][26]. In an extensive study, Ashouri et al [27] have recently investigated the influence of the water layer on ablation with free-running and Q-switched Er:YAG and Er:YSGG lasers, as well as Ho:YAG and 9.6-m TEA CO 2 laser. The authors have concluded that 'water augments the ablation of dental enamel by aiding in the removal of loosely attached deposits of non-apatite mineral phases from the crater surface, thus producing a more desirable surface morphology'.…”

Section: Discussionmentioning

confidence: 89%

Er:YAG Laser Modification of Root Canal Dentine: Influence of Pulse Duration, Repetitive Irradiation and Water Spray

et al. 2002

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The aim of this study was to determine the effects of varying parameters of Er:YAG laser irradiation with and without water spray cooling on root canal dentine in vitro. After horizontally removing tooth crowns from extracted human teeth, roots were axially sectioned into thin slices, exposing the root canal surface. An Er:YAG laser delivered 10-30 J/cm(2) into a 0.4-mm diameter laser spot on the root canal surface. Single pulses of different lengths (80-280 micro s) were applied with and without water spray cooling/irrigation, and sequences of three pulses at a repetition rate of 30 Hz were applied at selected pulse parameters. The irradiated samples were investigated using both confocal laser scanning microscopy (CLSM) and scanning electron microscopy (SEM). At most irradiation conditions, the root canal dentine surface was ablated. Three-dimensional images from CLSM revealed that the cavity walls were not smooth. Depths of the cavities revealed significant differences between the cavities. No debris was observed at the surface of cavities at any irradiation condition. Strong melting and recrystallisation, or unusually flat surfaces with open dentinal tubules were obtained with sequences of three pulses without water cooling. CLSM is an effective tool for investigation of laser effects on root canal dentine. By varying the irradiation conditions, the Er:YAG laser can induce different modifications of root canal surface, which may be very interesting for root canal preparation.

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Section: Discussionmentioning

confidence: 89%

Er:YAG Laser Modification of Root Canal Dentine: Influence of Pulse Duration, Repetitive Irradiation and Water Spray

et al. 2002

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“…Our measurements of the residual heat, deposited in the tooth with and without an applied water layer during Er:YAG ablation, show that water reduced the residual heat deposition by almost 50% without reducing the rate of ablation (see Table 2). Recent studies of multiple pulse irradiation of dental enamel using free running (150 msec) and Q-switched (150 nsec) Er:YAG lasers suggest that water augments the rate of enamel ablation by aiding in the removal of loosely attached deposits of nonapatite mineral phases from the crater surface [42,44,45]. The non-apatite mineral phases interfere with subsequent laser pulses during erbium laser irradiation reducing the rate of ablation.…”

Section: Discussionmentioning

confidence: 99%

Residual heat deposition in dental enamel during IR laser ablation at 2.79, 2.94, 9.6, and 10.6 μm

2001

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“…The water spray initiates the ablation process and increases the ablation rate efficiency [14] by assisting the removal of loosely attached deposits of non-apatite mineral phase [15,16] which interferes with subsequent laser pulses [17]. Also, the endogenous water increases the degree of ablation efficiency by eliminating the free water component from the tissue and maintaining the interprismatic stored water or bound OH components [18].…”

Section: Introductionmentioning

confidence: 99%

Impact of Er:YAG laser pulse duration on ultra-structure of dentin collagen fibrils

et al. 2018

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Purpose To evaluate the ultra-morphology of the dentin after irradiation with Er:YAG laser using shorter pulse durations in different protocols by transmission electron microscopy (TEM). The Er:YAG laser is an effective alternative method for hard dental tissue treatment with great acceptability among patients. However, undesirable effects may occur in dental substrate if the correct parameters are not chosen during irradiation protocols, jeopardizing bonding that could result in premature failures. But, before doing bonding tests, it is fundamental the knowledge of the laser action into dentin. It is well known that shorter pulses have less thermal damage due to less heat loss during irradiation; hence, it is primordial to evaluate the performance of shorter pulses in irradiation protocols. Methods Eighteen dentin disks with 2 mm thick were assigned into six experimental groups according to the irradiation protocol: cavity preparation (200 mJ and 20 Hz) and pretreatment (80 mJ and 2 Hz) varying the pulse duration (50, 300, or 600 μs), in focused distance and under refrigeration. Qualitative and semi-quantitative analyses were performed. Results The pretreatment with 50 μs was the protocol that maintained intact both architecture of collagens fibrils and an organized extracellular matrix. Nevertheless, the other groups showed a melted and carbonized dentin surface followed by fused zone of collagen fibrils with loss of interfibrillar spaces. Conclusions It was concluded that the thickness of the altered layer is directly proportional to the enhance of pulse duration for cavity preparation protocols tested. Moreover, pretreatment with 50 μs is an adequate protocol for dentin, which did not alter its ultra-morphology.

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<title>Infrared laser ablation of dental enamel: influence of an applied water layer on ablation rate and peripheral damage</title>

Cited by 4 publications

References 0 publications

Er:YAG Laser Modification of Root Canal Dentine: Influence of Pulse Duration, Repetitive Irradiation and Water Spray

Er:YAG Laser Modification of Root Canal Dentine: Influence of Pulse Duration, Repetitive Irradiation and Water Spray

Residual heat deposition in dental enamel during IR laser ablation at 2.79, 2.94, 9.6, and 10.6 μm

Impact of Er:YAG laser pulse duration on ultra-structure of dentin collagen fibrils

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