The Effect of Laser Etching Alone or Combined With Acid Etching on the Surface Morphology of Enamel: A Scanning Electron Microscopic Study

Laser use and applications in dentistry has increased dramatically in the last years. Laser etching of enamel may provide an alternative for conventional acid etching. The aim of this study was to evaluate, under Scanning Electron Microscope(SEM), enamel surface morphology after laser irradiation with or without the addition of photoabsorber (black ink); with or without acid etching. laser enamel etching produced surface roughness that might be used for the infiltration and subsequent mechanical retention of resin.

Effect of Enamel Thickness on Reading Accuracy of Dental Pulp Pulse Oximetry

Anatomical features and color characteristics of teeth may affect the recipient signals' nature during dental pulp oximetry, enamel tissue thickness may consider of the most important factors. This clinical study aimd to evaluate the effect of enamel tissue thickness of the upper premolar crown on the accuracy of dental pulp oxygen saturation readings. The results of this study indicate that there is a considerable effect of the dental tissue thickness on the dental pulp oxygenation measurement. So; it is of important to find the suitable adjustments on the PO apparatus, probe, or programs, in order to gain less effect of the anatomical variances between teeth, and thus increasing pulse oximetry measurement accuracy.