IADR Abstract Archives

A Comparison of Dentin Bond Strengths Following High-speed Rotary Handpiece Preparation vs.Er:YAG Laser Preparation

Er:YAG lasers have been approved by the FDA for dental hard tissue preparation, and have also advocated for etching of enamel and dentin. Alternative methods of tooth preparation result in morphologically different dentin and enamel surfaces, which could affect composite bonding to these substrates.

Objectives: To evaluate the bond strength of composites bonded to rotary and Er:YAG prepared dentin and enamel using three different means of etching.

Methods: Two–hundred forty noncarious human molar teeth, 6 dentin and 6 enamel groups, were prepared with Er:YAG laser or rotary instrumentation. The prepared specimens were then treated with either phosphoric acid etching, Er:YAG laser etching or no etching. A composite rod was bonded to the specimens using a fourth generation dentin bonding agent. Specimens were subjected to shear force in an Instron universal testing machine.

Results:

SUBSTRATE	PREPARATION	ETCHTANT	Mean (MPa)	Std Deviation	N
Dentin	Laser	Acid	7.130	4.3212	20
		Laser	8.420	3.0798	20
		None	11.295	4.2524	20
	Rotary	Acid	11.745	5.1420	20
		Laser	10.363	3.9318	19
		None	9.089	3.4893	19
Enamel	Laser	Acid	20.695	4.5833	20
		Laser	19.720	5.0305	20
		None	18.365	4.5680	20
	Rotary	Acid	26.205	6.7442	20
		Laser	14.870	3.3730	20
		None	12.935	2.3831	20

The data were analyzed with 2-factor ANOVA, and subsequently with a one-way ANOVA evaluating etch type. Conclusion: Although comparable bond strengths were often achieved with laser preparation and etching, the highest bond strengths achieved in this study were to rotary-prepared, acid-etched enamel and dentin.

Division: AADR/CADR Annual Meeting
Meeting: 2003 AADR/CADR Annual Meeting (San Antonio, Texas)
Location: San Antonio, Texas
Year: 2003
Final Presentation ID: 115
Abstract Category|Abstract Category(s): Dental Materials: I - Adhesion-Composite Bond Strength

Authors

Davis, John ( USAF, San Antonio, UT, USA )

Dunn, William J ( Wilford Hall Medical Center, San Antonio, UT, USA )

SESSION INFORMATION

Oral
Technical and Surface-conditioning Effects on Adhesion
03/13/2003