Surface treatment by different parameters of erbiumryttrium-aluminum-garnet [ENYAG] laser: scanning electron microscope [SEM] evaluation

Introduction: This study aimed to assess the Scanning Electron Microscope [SEM] analysis of tooth surface irradiated by erbium:yttrium-aluminum-garnet [EnYAG] laser with various parameters

Methods: Number of 25 extracted human third molars free of caries were used in this study.

The teeth were put into 5 groups for laser irradiation as follows: group 1 [power: 0.5 W, Energy: 50 mj]; group 2 [power: 1 W, Energy: 100 mj]; group 3 [power: 1.5 W, Energy: 150 mj]; group 4 [power: 2 W, Energy: 200 mj]; group 5 [power: 2.5 W, Energy: 250 mj]. All samples were prepared by repetition rate of 10 Hz and duration of 230 us, using a non-contact handpiece at a distance of 4 mm. Then, the samples were prepared for SEM examination

Results: SEM evaluation of every 25 samples, treated by EnYAG, showed that all groups had exposed dentinal tubules without any melted area or cracks

Conclusion: In this study we used SEM to investigate ablated dentine with different parameters of EnYAG laser energy. Our findings support these conclusions. All powers of laser below 3 W are proper for ablation, and make no cracks

Scanning electron microscope [SEM] evaluation of composite surface irradiated by different powers of Er:YAG laser

Introduction: The aim of this study was to evaluate the composite surface treated by different powers of Erbium-Doped Yttrium Aluminum Garnet [Er:YAG] laser in comparison with bur preparation via scanning electron microscope. Methods: Fourteen composite resin blocks with 15× 10 × 10 mm dimensions were used in this study. The samples were divided to seven groups as follow: Group 1 [power: 1 W, Energy: 50 m/l]; Group 2 [power: 2 W, Energy: 100 m/l]; Group 3 [power: 3W, Energy: 150 m/l]; Group 4 [power: 4 W, Energy: 200 m/l]; Group 5 [power: 5W, Energy: 250 m/l]; Group 6 [power: 6 W, Energy: 300 m/l]; Group 7: Diamond bur. Then, the samples were prepared for SEM examination. Results: The surface treated by Er:YAG laser showed irregular and micro porous surface. Conclusion: It seems that composite surface treatment by Er:YAG laser can be an alternative method for composite repair if suitable parameters are used