Er: YAG Laser Contact and Non-Contact Delivery Systems Cavity Preparation and Sonic-Activated Bulk Composite Restoration

Czech version

Authors: H. Jelínková ¹; M. Bučková ²; T. Dostálová ²; M. Kašparová ²; J. Šulc ¹; Martin Němec ¹; P. Bradna ³
Authors‘ workplace: Stomatologická klinika dětí a dospělých 2. LF UK a FN Motol, Praha ¹; Fakulta jaderná a fyzikálně inženýrská ČVUT, Praha ²; UKES 1. LF UK a VFN, Praha ³
Published in: Česká stomatologie / Praktické zubní lékařství, ročník 114, 2014, 3, s. 67-71
Category: Original Article – Experimental Study

Overview

Introduction:
The comparison of tissue quality and its restoration after contact, and non-contact Er: YAG (2940 nm) laser radiation ablation was evaluated.

Methods:
Laser setting for contact ablation was 250 mJ/pulse, pulse repetition rate 15 Hz, average power 3.75 W. For non-contact ablation these values were: 600 mJ/pulse, 6 Hz, 3.6 W. Structure of enamel and dentin after laser ablation was analyzed in scanning electron microscope. All cavities were filled by sonic-activated composite resin. Chemical and mechanical bond was observed in scanning electron microscope.

Microleakage was assessed quantitatively by the degree of methylene blue dye penetration. Fischer exact test (p < 0.05) was used for statistical evaluation.

Results:
Contact and non-contact laser treatments prepared similar cavities (5167.31 μm versus 5356.31 μm).

Defocusing of non-contact therapy has direct influence on the dye penetration microleakage presence (481.19 μm versus 611.94 μm) but this increase was not statistical significant.

Conclusion:
Cavity prepared by contact mode with sonic-activated composite filling protects microleakage formation.

Key words:
dentistry – Er: YAG laser – sonic activated composite material

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Article was published in

Czech Dental Journal

2014 Issue 3