Laser acoustic emission thermal technique (LAETT): a technique for generating acoustic emission in dental composites

Dental Materials : Official Publication of the Academy of Dental Materials
S J DurayE H Greener

Abstract

This study was designed to investigate a new method for generating interfacial debonding between the resin matrix and filler particles of dental composites. A pilot study was conducted to evaluate laser-induced acoustic emission in dental resins filled with varying quantities of particles. Model systems of 50/50 BisGMA/TEGDMA resin reinforced with 0, 25, and 75 wt% 5-10 micrometers silanated BaSiO(6) were analyzed. The sample size was 3.5 mm diameter x 0.25-0.28 mm thick. A continuous wave CO2 laser (Synrad Infrared Gas Laser Model 48-1) was used to heat the composite samples. Acoustic events were detected, recorded and processed by a model 4610 Smart Acoustic Monitor (SAM) with a 1220A preamp (Physical Acoustic Corp.) as a function of laser power. Initially, the acoustic signal from the model composites produced a burst pattern characteristic of fracturing, about 3.7 watts laser power. Acoustic emission increased with laser power up to about 6 watts. At laser powers above 6 watts, the acoustic emission remained constant. The amount of acoustic emission followed the trend: unfilled resin > composite with 25 wt% BaSiO(6) > composite with 75 wt% BaSiO(6). Acoustic emission generated by laser thermal heating is dependent on the we...Continue Reading

References

Jan 1, 1992·Journal of Biomedical Materials Research·D H KohnJ Awerbuch

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Citations

Jun 13, 2000·Biomaterials·S Y LeeH C Cheng
Jun 5, 1998·Journal of Dentistry·R StrangD Woods
Sep 29, 2011·Dental Materials : Official Publication of the Academy of Dental Materials·YungChung ChenAlex Fok
Apr 24, 2015·Dental Materials Journal·Nadia S EreifejSandra K Altarawneh

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