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Shear bond strength of resin cement to an acid etched and a laser irradiated ceramic surface.

Kursoglu P, Motro PF, Yurdaguven H - J Adv Prosthodont (2013)

Bottom Line: Their surfaces were finished with 1000-grit silicon carbide paper.Bonded specimens were stored in distilled water at 37℃ for 24 hours.No significant difference was observed between Group 4 (3.59 ± 1.19 MPa) and Control group.

View Article: PubMed Central - PubMed

Affiliation: Department of Prosthodontics, Faculty of Dentistry, Yeditepe University, Istanbul, Turkey.

ABSTRACT

Purpose: To evaluate the effects of hydrofluoric acid etching and Er,Cr:YSGG laser irradiation on the shear bond strength of resin cement to lithium disilicate ceramic.

Materials and methods: Fifty-five ceramic blocks (5 mm × 5 mm × 2 mm) were fabricated and embedded in acrylic resin. Their surfaces were finished with 1000-grit silicon carbide paper. The blocks were assigned to five groups: 1) 9.5% hydrofluoric-acid etching for 60 s; 2-4), 1.5-, 2.5-, and 6-W Er,Cr:YSGG laser applications for 60 seconds, respectively; and 5) no treatment (control). One specimen from each group was examined using scanning electron microscopy. Ceramic primer (Rely X ceramic primer) and adhesive (Adper Single Bond) were applied to the ceramic surfaces, followed by resin cement to bond the composite cylinders, and light curing. Bonded specimens were stored in distilled water at 37℃ for 24 hours. Shear bond strengths were determined by a universal testing machine at 1 mm/min crosshead speed. Data were analyzed using Kruskal-Wallis and Mann-Whitney U-tests (α=0.05).

Results: Adhesion was significantly stronger in Group 2 (3.88 ± 1.94 MPa) and Group 3 (3.65 ± 1.87 MPa) than in Control group (1.95 ± 1.06 MPa), in which bonding values were lowest (P<.01). No significant difference was observed between Group 4 (3.59 ± 1.19 MPa) and Control group. Shear bond strength was highest in Group 1 (8.42 ± 1.86 MPa; P<.01).

Conclusion: Er,Cr:YSGG laser irradiation at 1.5 and 2.5 W increased shear bond strengths between ceramic and resin cement compared with untreated ceramic surfaces. Irradiation at 6 W may not be an efficient ceramic surface treatment technique.

No MeSH data available.


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Scanning electron microscopic image of 2.5 W laser irradiated surface (×1,000 magnification).
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Figure 5: Scanning electron microscopic image of 2.5 W laser irradiated surface (×1,000 magnification).

Mentions: SEM evaluation of the Er,Cr:YSGG laser-treated lithium disilicate ceramic surfaces revealed that surface structure depended on the surface treatment method and laser parameter. Lithium disilicate crystals were visible on the specimen from Group 1 (Fig. 3). More surface irregularities were observed on the specimen from Group 2 than on the control specimen (Fig. 4). In turn, more surface irregularities were observed in Group 3 than in Group 2, despite the absence of a significant difference in shear bond strength values (Fig. 5). The specimen from Group 4 (6 W laser irradiation) also exhibited increased surface irregularity, as well as severely affected lithium disilicate crystals and over destruction of the surface (Fig. 6). The specimen from Group 5 had a typical untreated ceramic surface (Fig. 7).


Shear bond strength of resin cement to an acid etched and a laser irradiated ceramic surface.

Kursoglu P, Motro PF, Yurdaguven H - J Adv Prosthodont (2013)

Scanning electron microscopic image of 2.5 W laser irradiated surface (×1,000 magnification).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3675300&req=5

Figure 5: Scanning electron microscopic image of 2.5 W laser irradiated surface (×1,000 magnification).
Mentions: SEM evaluation of the Er,Cr:YSGG laser-treated lithium disilicate ceramic surfaces revealed that surface structure depended on the surface treatment method and laser parameter. Lithium disilicate crystals were visible on the specimen from Group 1 (Fig. 3). More surface irregularities were observed on the specimen from Group 2 than on the control specimen (Fig. 4). In turn, more surface irregularities were observed in Group 3 than in Group 2, despite the absence of a significant difference in shear bond strength values (Fig. 5). The specimen from Group 4 (6 W laser irradiation) also exhibited increased surface irregularity, as well as severely affected lithium disilicate crystals and over destruction of the surface (Fig. 6). The specimen from Group 5 had a typical untreated ceramic surface (Fig. 7).

Bottom Line: Their surfaces were finished with 1000-grit silicon carbide paper.Bonded specimens were stored in distilled water at 37℃ for 24 hours.No significant difference was observed between Group 4 (3.59 ± 1.19 MPa) and Control group.

View Article: PubMed Central - PubMed

Affiliation: Department of Prosthodontics, Faculty of Dentistry, Yeditepe University, Istanbul, Turkey.

ABSTRACT

Purpose: To evaluate the effects of hydrofluoric acid etching and Er,Cr:YSGG laser irradiation on the shear bond strength of resin cement to lithium disilicate ceramic.

Materials and methods: Fifty-five ceramic blocks (5 mm × 5 mm × 2 mm) were fabricated and embedded in acrylic resin. Their surfaces were finished with 1000-grit silicon carbide paper. The blocks were assigned to five groups: 1) 9.5% hydrofluoric-acid etching for 60 s; 2-4), 1.5-, 2.5-, and 6-W Er,Cr:YSGG laser applications for 60 seconds, respectively; and 5) no treatment (control). One specimen from each group was examined using scanning electron microscopy. Ceramic primer (Rely X ceramic primer) and adhesive (Adper Single Bond) were applied to the ceramic surfaces, followed by resin cement to bond the composite cylinders, and light curing. Bonded specimens were stored in distilled water at 37℃ for 24 hours. Shear bond strengths were determined by a universal testing machine at 1 mm/min crosshead speed. Data were analyzed using Kruskal-Wallis and Mann-Whitney U-tests (α=0.05).

Results: Adhesion was significantly stronger in Group 2 (3.88 ± 1.94 MPa) and Group 3 (3.65 ± 1.87 MPa) than in Control group (1.95 ± 1.06 MPa), in which bonding values were lowest (P<.01). No significant difference was observed between Group 4 (3.59 ± 1.19 MPa) and Control group. Shear bond strength was highest in Group 1 (8.42 ± 1.86 MPa; P<.01).

Conclusion: Er,Cr:YSGG laser irradiation at 1.5 and 2.5 W increased shear bond strengths between ceramic and resin cement compared with untreated ceramic surfaces. Irradiation at 6 W may not be an efficient ceramic surface treatment technique.

No MeSH data available.


Related in: MedlinePlus