Clinical Evaluation of Polymethyl Methacrylate CAD/CAM Crowns Versus Prefabricated Zirconia Crowns in Primary Molars

Occlusal reduction 1 to 2 mm using flame bur . Open the interproximal contacts. The tooth should be reduced circumferentially by approximately 0.5-1.5mm . The preparation margin should be carefully extended and refined to a feather-edge approximately 1-2mm subgingivally . Crown size will be determined using try in kit .

* Open the interproximal contacts . * The tooth should be reduced circumferentially by approximately 0.5-1mm . * The preparation margin should be carefully extended and refined to a feather- edge approximately 1-2mm subgingivally . * Rubber base impression will be taken by BMS additional silicone kit to the prepared tooth and will be sent to the laboratory to be scanned and to design the crown . * The final crown will be cemented using glass ionomer cement .