Surface damages of zirconia by Nd:YAG dental laser irradiation

Noda, Makoto; Okuda, Yuji; Tsuruki, J; Minesaki, Yoshito; Takenouchi, Yasumi; Ban, Seiji

doi:10.4012/dmj.2009-127

Cited by 67 publications

(53 citation statements)

References 18 publications

(22 reference statements)

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“…Surface treatments such as air abrasion with aluminum oxide particles roughen the zirconia surface and increase the bond strength 17) . Other surface treatments of zirconia including laser treatment 18,19) , selective infiltration technique (SIE) 20) , hot etching solution 21,22) , nanostructured alumina coating 23) , and slurry-coated ceramic 24) have been developed to improve and enhance the surface roughened area to facilitate the mechanical interlocking of the ceramic and bonding resin.…”

Section: Introductionmentioning

confidence: 99%

Dental zirconia can be etched by hydrofluoric acid

et al. 2014

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The surface morphology and crystal structure change of dental zirconia after hydrofluoric acid (HF) etching were evaluated. Four groups of sintered zirconia specimens were 1) control group, 2) immersion in 9.5%HF at 25 o C for 1, 2, 3, or 24 h, 3) immersion in 9.5%HF at 80o C for 1, 3, 5, or 30 min and 4) immersion in 48%HF at 25 o C for 30 or 60 min. The specimens were evaluated under SEM and XRD. The SEM analysis revealed changes in surface topography for all the HF-etched zirconia specimens. The irregularities surface increased with increasingly longer immersion times and higher etching solution temperatures. The XRD analysis of the HFetched zirconia specimens revealed the presence of a crystalline monoclinic phase along with a tetragonal form. It was concluded HF can etch dental zirconia ceramic, creating micro-morphological changes. Tetragonal-to-monoclinic phase transformation was induced on the etched zirconia surface.

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Section: Introductionmentioning

confidence: 99%

Dental zirconia can be etched by hydrofluoric acid

et al. 2014

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“…Darkening of Y-TZP irradiated by a nanosecond laser should be a result of oxygen vacancies that were generated at high temperatures due to the release of oxygen atoms after substoichiometric dioxide formation, in which ZrO 2 became ZrO2-X 14,15) . Noda et al reported that a surface irradiated by a Nd:YAG laser became darkened and that the oxygen concentration clearly decreased, whereas the zirconium concentration increased 7) . Irradiated Y-TZP disks heated at 1,000°C for 5 min in air retuned to their original white color.…”

Section: Darkening Of the Machined Y-tzp Surface And Corresponding Comentioning

confidence: 99%

“…Metal parts such as frameworks can be joined by self-welding of the parts with combustible acrylic denture base resins and artificial composite teeth, which would be burned by conventional soldering 6) . Noda et al conducted an experiment involving the irradiation of zirconia using this Nd:YAG laser and examined the possibility of welding zirconia 7) . They reported that laser irradiation induced cracking on the surfaces of zirconia so Nd:YAG dental laser welding should not be performed on zirconia 7) .…”

Section: Introductionmentioning

confidence: 99%

“…Noda et al conducted an experiment involving the irradiation of zirconia using this Nd:YAG laser and examined the possibility of welding zirconia 7) . They reported that laser irradiation induced cracking on the surfaces of zirconia so Nd:YAG dental laser welding should not be performed on zirconia 7) . Nd:YAG dental laser irradiation, which produced a millisecond-order pulse width, generated thermal effects on zirconia 8) .…”

Section: Introductionmentioning

confidence: 99%

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A new method for fabricating zirconia copings using a Nd:YVO4 nanosecond laser

et al. 2014

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The purpose of this work was to fabricate zirconia copings from fully sintered Y-TZP blocks using a Nd:YVO 4 nanosecond laser in order to avoid complicated procedures using conventional CAD/CAM systems. To determine the most appropriate power level of a Nd:YVO 4 laser, cuboid fully sintered Y-TZP specimens were irradiated at six different average power levels. One-way ANOVAs for the average surface roughness and laser machining depth revealed that an average power level of 7.5 W generated a smooth machined surface with high machining efficiency. Y-TZP copings were then machined using the proposed method with the most appropriate power level. As the number of machining iterations increased, the convergence angles decreased significantly (p<0.01). The accuracy of the machined copings was judged to be good based on 3D measurements and traditional metal die methods. The proposed method using the nanosecond laser was demonstrated to be useful for fabricating copings from fully sintered Y-TZP.

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“…Yttria-stabilized tetragonal zirconia polycrystals (Y-TZP) possess the requisite properties for use in dental restorations such as crowns, bridges, implant fixtures, abutments, and orthodontic brackets [1][2][3] . An intragranular type of Ce-TZP/Al2O3 nanocomposite was developed in which extremely fine Al2O3 and Ce-TZP particles are located within submicron-sized Ce-TZP and Al 2O3 grains respectively 4) .…”

Section: Introductionmentioning

confidence: 99%

HRTEM observation of bonding interface between Ce-TZP/Al<sub>2</sub>O<sub>3</sub> nanocomposite and porcelain

et al. 2014

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The surface of a ceria-stabilized tetragonal zirconia polycrystal (Ce-TZP/Al 2 O 3 ) nanocomposite was sandblasted by alumina particles and veneered with feldspathic porcelain via a conventional condensation method. The part of each specimen containing the interface layer was sliced to ultrathin sections with an argon ion slicer, and these sliced sections were observed using high-resolution transmission electron microscopy (HRTEM). For both interfaces, Ce-TZP/porcelain and Al 2 O 3 /porcelain, no transition layers due to abrupt changes in atomic distributions were observed. Besides, the porcelain layers of both interfaces consisted of homogeneous amorphous phases. These results suggested that both Ce-TZP and Al 2 O 3 could be directly bonded to porcelain by Van der Waals forces arising from the close contact between them.

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Surface damages of zirconia by Nd:YAG dental laser irradiation

Cited by 67 publications

References 18 publications

Dental zirconia can be etched by hydrofluoric acid

Dental zirconia can be etched by hydrofluoric acid

A new method for fabricating zirconia copings using a Nd:YVO4 nanosecond laser

HRTEM observation of bonding interface between Ce-TZP/Al<sub>2</sub>O<sub>3</sub> nanocomposite and porcelain

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