A Comparative Laboratory Study to Evaluate the Microtensile Bond Strength after Caries Removal by Rotary Burs ,Chemomechanical Technique and Dental Laser and Restoration by Resin Composite.

الملخص

This research aims to investigate the effect of different techniques for caries removal (conventional stainless steel Burs- Smart Burs II - Chemomechanical Technique - dental laser) on the bond strength with resin restoration materials, by evaluating the microstensile bond strength of samples after applying a typical fifth generation bonding system.
The study included a caries removal of (40) human molars with occlusal caries. The sample was divided randomly into four equal groups :the caries of each group was removed only by one of caries removal techniques. After completing the caries removal, the area of the formed cavity was calculated through digital scanning and computer programs. The cavity restored by nanohybrid resin material after applying 5th generation bonding system .The samples were subjected to a microtensile bond strength test by Testometric device (Universal Testing Machine(.
The microtensile Bond strength values were highest in the dental laser caries removal group, and the lowest values were in the caries removal group using smart Burs, however, there were no statistically significant differences between the caries removal groups (with dental laser - the conventional technique – CMCR technique) , While there were significant differences between the group of caries removal using smart Burs and the rest of the Careis Removal groups.
This laboratory experiment showed the role of dental laser, chemio-mechanical technique as well as conventional technique in increasing bond strength with resin restoration materials.