The effect of CO2 and Nd:YAP lasers on CAD/CAM Ceramics: SEM, EDS and thermal studies

Gamal, Ahmed El; Fornaini, Carlo; Rocca, Jean‐Paul; Muhammad, Omid H.; Medioni, Etienne; Cucinotta, Annamaria; Brulat-Bouchard, Nathalie

doi:10.5978/islsm.16-or-02

Cited by 18 publications

(7 citation statements)

References 18 publications

(9 reference statements)

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“…Laser group could demonstrate more hydrophilic property than sintering counterpart. The current result is in agreement with previous literature 37) . However, it is contradicted with previous investigation which was demonstrated a minimal impact of CO 2 laser irradiation on the contact angle values 38) .…”

Section: Discussionsupporting

confidence: 94%

The impact of laser scanning on zirconia coating and shear bond strength using veneer ceramic material

Abdullah

Muhammed

et al. 2019

Dent. Mater. J.

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Laser scanning is one of the methods that can be used for surface treatments of zirconia. Application of the laser to the surface of zirconia has diverse effects, depending on the type of laser. A carbon dioxide (CO2) laser has high irradiation power and can alter the surface properties. This study investigated the surface coating of zirconia as a core material that subsequently coated with a veneering ceramic (v-c) material. This study compared laser scanning and conventional sintering processes. Various properties including surface topography, interface evaluation, phase transformation, elemental compositions, failure mode patterns, and contact angle were examined through X-ray diffractometry (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) analyses. Results were confirmed that the bond strength between the v-c and the substrate recorded through laser scanning was higher than that determined through conventional sintering.

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Section: Discussionsupporting

confidence: 94%

The impact of laser scanning on zirconia coating and shear bond strength using veneer ceramic material

Abdullah

Muhammed

et al. 2019

Dent. Mater. J.

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“…This is also the reason for the great differences in the power densities utilized in this study (1.3 to 27 kW/cm 2 ), compared to those used in the similar cited works [ 25 , 26 ] performed with different wavelengths. The measure of temperature rise during laser irradiation may shed some light on the explanation behind the crack formation after laser irradiation, which could be explained through the high thermal effects of laser processing, along with the consequence of an extreme physical stress in the re-hardening ceramic surface.…”

Section: Discussionmentioning

confidence: 87%

“…Particularly, some tests conducted on lithium disilicate [ 25 ] and CAD-CAM ceramics [ 26 ] with a CW CO 2 laser at 10.6 μm confirmed the presence of micro-cracks and melting textures, due to the thermal effect of the laser irradiation at output powers higher than 10 W CW (3184.7 W/cm 2 ). Moreover, the observation of the ceramics structure irradiated by a 10 W (14,185 W/cm 2 ) pulsed Nd:YAP laser at 1340 nm exhibited the presence of holes, micro-cracks, and melted grains [ 25 , 26 ]. This is probably caused by the effect of a high quantity of radiation energy given in a well-defined portion of the ceramic surface over a short period, thus leading to a very high energy density accumulation.…”

Section: Discussionmentioning

confidence: 99%

Disilicate Dental Ceramic Surface Preparation by 1070 nm Fiber Laser: Thermal and Ultrastructural Analysis

Fornaini

Poli

Merigo³

et al. 2018

Bioengineering

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Lithium disilicate dental ceramic bonding, realized by using different resins, is strictly dependent on micro-mechanical retention and chemical adhesion. The aim of this in vitro study was to investigate the capability of a 1070 nm fiber laser for their surface treatment. Samples were irradiated by a pulsed fiber laser at 1070 nm with different parameters (peak power of 5, 7.5 and 10 kW, repetition rate (RR) 20 kHz, speed of 10 and 50 mm/s, and total energy density from 1.3 to 27 kW/cm2) and the thermal elevation during the experiment was recorded by a fiber Bragg grating (FBG) temperature sensor. Subsequently, the surface modifications were analyzed by optical microscope, scanning electron microscope (SEM), and energy dispersive X-ray spectroscopy (EDS). With a peak power of 5 kW, RR of 20 kHz, and speed of 50 mm/s, the microscopic observation of the irradiated surface showed increased roughness with small areas of melting and carbonization. EDS analysis revealed that, with these parameters, there are no evident differences between laser-processed samples and controls. Thermal elevation during laser irradiation ranged between 5 °C and 9 °C. A 1070 nm fiber laser can be considered as a good device to increase the adhesion of lithium disilicate ceramics when optimum parameters are considered.

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“…The long-term success of these kinds of restoration seems to be in function of an adhesive cementation, and for this purpose, several methods for crown and teeth preparation have been proposed including computer-aided design/computer-aided manufacturing. [4]…”

Section: Introductionmentioning

confidence: 99%

Erbium-doped, yttrium-aluminum-garnet laser debonding of porcelain laminate veneers: An ex vivo study

et al. 2018

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Background:The use of ceramic laminate veneer has considerably and successfully grown to improve anterior tooth esthetics in recent years. The removal of ceramic laminate veneers with laser is reported only in a scanty number of publications and for this reason the importance and the aim of this ex vivo study consist to verify the ability of Er: YAG laser for laminate veneers debonding with the preserving of the tooth structures (scanning electron microscopy [SEM] observations).Aim:The purpose of this study consists to verify if erbium-doped, yttrium-aluminum-garnet (Er:YAG) laser, at low fluences, is able to debond porcelain veneers, successfully used to improve anterior tooth esthetics, without damaging the tooth structures.Settings and Design:A total of 12 freshly extracted teeth were used, and samples were decontaminated, stored, and bonded to obtain veneers adhesion. One week after, Er:YAG laser with a non-contact sapphire tip with air-water spray was used for veneer debonding at 100 mJ of energy and 30 Hz of frequency (Fluence 19.94 J/cm2).Results:Results demonstrated that veneer debonding is possible with an Er:YAG laser and the total number of pulses seems not related to its efficiency. SEM observation confirms that residual tooth structure is not altered when using these low fluences.Conclusions:Low fluences with Er:YAG laser are able to debond veneers while preserving the tooth structures and SEM observation confirmed that residual tooth structure is not altered with low fluences.

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The effect of CO2 and Nd:YAP lasers on CAD/CAM Ceramics: SEM, EDS and thermal studies

Cited by 18 publications

References 18 publications

The impact of laser scanning on zirconia coating and shear bond strength using veneer ceramic material

The impact of laser scanning on zirconia coating and shear bond strength using veneer ceramic material

Disilicate Dental Ceramic Surface Preparation by 1070 nm Fiber Laser: Thermal and Ultrastructural Analysis

Erbium-doped, yttrium-aluminum-garnet laser debonding of porcelain laminate veneers: An ex vivo study

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