J Adv Prosthodont.  2012 Nov;4(4):192-196. 10.4047/jap.2012.4.4.192.

Effect of different provisional cement remnant cleaning procedures including Er:YAG laser on shear bond strength of ceramics

• Zortuk M
• Gumus HO
• Kilinc HI
• Tuncdemir

• KMID: 2176417
• DOI: http://doi.org/10.4047/jap.2012.4.4.192

Abstract

PURPOSE
The purpose of this study was to evaluate the effect of provisional cement removal by different dentin cleaning protocols (dental explorer, pumice, cleaning bur, Er:YAG laser) on the shear bond strength between ceramic and dentin.
MATERIALS AND METHODS
In total, 36 caries-free unrestored human third molars were selected as tooth specimens. Provisional restorations were fabricated and cemented with eugenol-free provisional cement. Then, disc-shaped ceramic specimens were fabricated and randomly assigned to four groups of dentin cleaning protocols (n = 9). Group 1 (control): Provisional cements were mechanically removed with a dental explorer. Group 2: The dentin surfaces were treated with a cleaning brush with pumice Group 3: The dentin surfaces were treated with a cleaning bur. Group 4: The provisional cements were removed by an Er:YAG laser. Self-adhesive luting cement was used to bond ceramic discs to dentin surfaces. Shear bond strength (SBS) was measured using a universal testing machine at a 0.05 mm/min crosshead speed. The data were analyzed using a Kolmogorov Smirnov, One-way ANOVA and Tukey HSD tests to perform multiple comparisons (alpha=0.05).
RESULTS
The dentin cleaning methods did not significantly affect the SBS of ceramic discs to dentin as follows: dental explorer, pumice, cleaning bur, and Er:YAG laser.
CONCLUSION
The use of different cleaning protocols did not affect the SBS between dentin and ceramic surfaces.

Keyword

Bond strength; Er:YAG laser; Porcelain; Provisional cement

MeSH Terms

Ceramics
Collodion
Dental Porcelain
Dentin
Humans
Molar, Third
Silicates
Tooth
Ceramics
Collodion
Dental Porcelain
Silicates

Figure

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  Fig. 1 A special loading device was designed to apply a constant load of 9.2 N to the ceramic discs.

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  Fig. 2 Results of the shear bond strength tests (P>.05).

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  Fig. 3 SEM micrographs of provisional cement contaminated dentin surfaces after dentin cleaning protocols. A: Cleaned with dental explorer, B: Cleaned with cleaning bur, C: Cleaned with pumice, D: Cleaned with LASER (Original magnification×1,000).

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  Fig. 4 SEM micrographs of dentin surfaces cleaned with different dentin cleaning protocols after SBS test. A: Cleaned with dental explorer, B: Cleaned with cleaning bur, C: Cleaned with pumice, D: Cleaned with LASER (Original magnification×1,000).

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