J Korean Acad Conserv Dent.  2011 Sep;36(5):409-418. 10.5395/JKACD.2011.36.5.409.

Effect of Er:YAG lasing on the dentin bonding strength of two-step adhesives

• Song BC
• Cho YG
• Lee MS

• KMID: 2176578
• DOI: http://doi.org/10.5395/JKACD.2011.36.5.409

Abstract

OBJECTIVES
The purpose of this study was to compare the microshear bond strength (microSBS) and bonding interfaces of two-step total-etching and self-etching adhesive systems to three etch types of dentin either the acid etched, laser etched or laser and acid etched.
MATERIALS AND METHODS
The occlusal dentinal surfaces of thirty human molars were used. They were divided into six groups: group 1, 37% H3PO4 + Single Bond 2 (3M ESPE); group 2, Er:YAG laser (KEY Laser 3, KaVo) + Single Bond 2; group 3, Er:YAG laser + 37% H3PO4 + Single Bond 2; group 4, Clearfil SE Primer + Bond (Kuraray); group 5, Er:YAG laser + Clearfil SE Bond; group 6, Er:YAG laser + Clearfil SE Primer + Bond. The samples were subjected to microSBS testing 24 hr after bonding. Also scanning microscopic evaluations were made on the resin-dentin interfaces of six specimens.
RESULTS
The microSBS of group 2 was significantly lower than that of groups 1 and 3 in Single Bond 2 (p < 0.05). There were significant differences among the uSBS of groups 4, 5, and 6 in Clearfil SE Bond (p < 0.05). Very short and slender resin tags were observed in groups 2 and 5. Long and slender resin tags and lateral branches of tags were observed in groups 3 and 6.
CONCLUSIONS
Treatment of dentin surface using phosphoric acid or self-etching primer improved the adhesion of Er:YAG lased dentin.

Keyword

Bonding interfaces; Er:YAG lasing; Microshear bond strength; Two-step adhesives

MeSH Terms

Adhesives
Bisphenol A-Glycidyl Methacrylate
Dentin
Humans
Molar
Phosphoric Acids
Resin Cements
Adhesives
Bisphenol A-Glycidyl Methacrylate
Phosphoric Acids
Resin Cements

Figure

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  Figure 1 Scanning electron microscophic photograph showing the hybrid layer (H) and many taper resin tags with lateral branches (LB) in Group 1.

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  Figure 2 Scanning electron microscophic photograph showing the wide gap (G) and few short and slender resin tags in Group 2.

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  Figure 3 Scanning electron microscophic photograph showing the hybrid layer (H), slender and long rod shaped resin tags with lateral branches (LB) in Group 3.

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  Figure 4 Scanning electron microscophic photograph showing the hybrid layer (H) and many long rod shaped resin tags with lateral branches (LB) in Group 4.

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  Figure 5 Scanning electron microscophic photograph showing the small gap (G) at the resin-dentin interface and short and slender resin tags in Group 5.

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  Figure 6 Scanning electron microscophic photograph showingthe hybrid layer (H) and few slender and long resin tags in Group 6.

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