From ESOLA Journal of Oral Laser Appplications ( Vol 3, Number 4 Winter 2003)-

Microleakage of Class I and ClassV Resin Composite After Bur or Er,Cr,YSGG Laser Preparation

Tankut Gursoy,Magrur Kazak,Kagan Gokce,Yasemin Benderli

Purpose
The aim of this study was to compare marginal microleakage of resin composites in Class I and Class V cavities prepared classically(bur) or with an er,cr:YSGG laser sysytem.

Materials and Methods
54 caries free extracted human 3rd molars were divided into 2 equal groups; group 1 (unlased), all cavities (n=9classV,n=18ClassI)were prepared with a bur and total etched;group2 (lased) all cavities(n=9 Class V;n=18 class I)were prepared w/ an er,cr:ysgg laser. After cavity preparation, an adhesive system(Excite) was applied and a resin composite (TetricCeram) placed into all cavities according to manufacturers instructions. The teeth were sealed w/ nail polish, imersed in 5% methylene blue, sectioned, and examined w/ a stereomicroscope at 10X.Dye penetration scores were recorded using different scales for ClassI and ClassV cavities.

Results
Unlased Class I cavities had statistically significant(p<.001) less microleakage than lased class I cavities. In Class V cavities, coventional preparation also yielded significantly less microleakage than did er,cr:YSGG
laser preparation

Conclusion

Our findings show that er,cr:YSGG laser irradiation of enamel and dentin is not a valid alternative to acid etching pretreatment of cavities to be filled w/ resin compositie materials.

Any companies still claiming laser etching increases bond strength 90%?