Evaluation of Bioflex and Zirconia Crowns Versus Stainless Steel Crowns on Primary Molars: Randomized Controlled Clinical Trial

A preformed bioflex crown of similar size will be selected. Tooth preparation will be done using a tapered diamond bur to reduce the occlusal surface, including the central groove, by 1-1.5 mm. The proximal surfaces will be prepared by approximately 0.5 mm to clear the contact area, bioflex crown fitting and proper occlusion will be checked then it will be cemented using type-I glass ionomer cement, Any excess cement will be removed.

"Occlusal reduction will be done by 1-1.5 mm using coarse football shaped diamond bur following the natural occlusal anatomy.~Interproximal contacts will be opened with a tapered fissure bur. The proximal space should be enough to permit the chosen crown to fit passively.~The molar will be trimmed down circumferentially 0.5-1.25 mm as needed with the use of tapered diamond burs.~•About 1 to 2 mm subgingival preparation will be done to achieve a feather-edge finish line.~Prepared tooth should be free from any blood or saliva. Try-in will be done using the pink crowns, to check the occlusion and Passive fit of the crown.~The zirconia crown will be luted with type I glass ionemer cement. Consistent firm finger pressure will be applied during cementation, Any excess cement will be removed, and proper occlusion will be verified"

"An appropriately sized preformed stainless-steel crown will be selected. Tooth preparation will involve using a tapered bur to reduce the occlusal surface by 1 to 1.5 mm, with interproximal reduction made on the mesial and distal sides. The selected crown size will be checked, and a trial fit will be conducted prior to cementation. Crimping pliers will be used, and the crown will be cemented with Type 1 glass ionomer cement.~Any excess cement will be removed, and proper occlusion will be verified"