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A Comparative Study to Evaluate the Surface Quality of Erbium Dental Lasers with Conventional Bur Preparation Followed by the Microleakage Assessment of the Composite and Cerec Cad-Cam Restored Cavities

Mudasser Iqbal*

The surface quality of the prepared tooth strongly contributes to the longevity of the filling material and protection against caries. Restoration failure and development of incipient caries under the restoration are one of the major problems we face in our old dental practice despite our utmost struggle. This problem was never addressed until the introduction of modern technology that revealed the mystery behind the failure. With the new modern laser technology, we can overcome the problem at ease. Dental hard tissue laser prepares the cavities through the process called “Water Mediated Ablation”. It has the advantages over the conventional bur preparation by removing any debris such as smear layer and bacterial colonies within the dentinal tubules. This paper therefore, is a comparative study that examines the surface quality of the teeth cavities prepared with two high-end dental lasers Er: YAG, Er, Cr: YSGG with the conventional handpiece bur. Same settings were used for both hard tissue Er: YAG and Er, Cr: YSGG lasers. The surface quality of prepared cavities was examined under an electron microscope. Restoration is made using the state of the art CEREC Cad-Cam system and conventional nano-composite filling material. Cavities were scored for microleakage after thermocycling and dye penetration test. This penetration test contributes to nearly 10 years of stress in the normal oral environment. The microleakage was then examined under a leica microscope. The surface quality of the cavities prepared with both dental hard tissue lasers was clear of smear layer promising the longevity and durability of the restoration and declining of incipient caries. Convention preparation showed smear layer and obstruction of dentinal tubules preventing the bonding material to penetrate and seal leading to the future development of incipient caries and dislodgements.