Lasers in Medical Science

, Volume 32, Issue 9, pp 1981–1993 | Cite as

Bond strength of etch-and-rinse and self-etch adhesive systems to enamel and dentin irradiated with a novel CO2 9.3 μm short-pulsed laser for dental restorative procedures

  • Peter Rechmann
  • N. Bartolome
  • R. Kinsel
  • R. Vaderhobli
  • B. M. T. Rechmann
Original Article


The objective of this study was to evaluate the influence of CO2 9.3 μm short-pulsed laser irradiation on the shear bond strength of composite resin to enamel and dentin. Two hundred enamel and 210 dentin samples were irradiated with a 9.3 µm carbon dioxide laser (Solea, Convergent Dental, Inc., Natick, MA) with energies which either enhanced caries resistance or were effective for ablation. OptiBond Solo Plus [OptiBondTE] (Kerr Corporation, Orange, CA) and Peak Universal Bond light-cured adhesive [PeakTE] (Ultradent Products, South Jordan, UT) were used. In addition, Scotchbond Universal [ScotchbondSE] (3M ESPE, St. Paul, MN) and Peak SE self-etching primer with Peak Universal Bond light-cured adhesive [PeakSE] (Ultradent Products) were tested. Clearfil APX (Kuraray, New York, NY) was bonded to the samples. After 24 h, a single plane shear bond test was performed. Using the caries preventive setting on enamel resulted in increased shear bond strength for all bonding agents except for self-etch PeakSE. The highest overall bond strength was seen with PeakTE (41.29 ± 6.04 MPa). Etch-and-rinse systems achieved higher bond strength values to ablated enamel than the self-etch systems did. PeakTE showed the highest shear bond strength with 35.22 ± 4.40 MPa. OptiBondTE reached 93.8% of its control value. The self-etch system PeakSE presented significantly lower bond strength. The shear bond strength to dentin ranged between 19.15 ± 3.49 MPa for OptiBondTE and 43.94 ± 6.47 MPa for PeakSE. Etch-and-rinse systems had consistently higher bond strength to CO2 9.3 µm laser-ablated enamel. Using the maximum recommended energy for dentin ablation, the self-etch system PeakSE reached the highest bond strength (43.9 ± 6.5 MPa).


CO2 9.3 μm laser Microsecond short-pulsed Human enamel Human dentin Laboratory study Shear bond strength Etch-and-rinse Self-etch Scanning electron microscopy 



Thanks to Khanh Nguyen and Brian Po Lee, UCSF, School of Dentistry, Class of 2017 for helping with the sample preparation.

Compliance with ethical standards

Conflicts of interest

The authors declare that they have no conflict of interest.


This study is the principal investigator’s initiated study and was funded by the Convergent Dental, Inc. through the University of California, San Francisco’s Contracts & Grants Division.


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Copyright information

© US Government (outside the USA) 2017

Authors and Affiliations

  1. 1.Department of Preventive and Restorative Dental Sciences, School of DentistryUniversity of California at San FranciscoSan FranciscoUSA

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