Clinical Research Directory

(Group A: Preformed Biofix Crown - Assigned Intervention) Crown Selection \& Tooth Preparation: Measure the mesiodistal width using calipers to select an appropriately sized crown. If a mesial or distal wall is missing, use the contralateral tooth for size selection. Choose the crown that closely matches the measured mesiodistal width. Select the smallest crown that preserves proximal contacts using a trial-and-error approach. If crimping is necessary, use Howe's pliers. Perform 1-1.5 mm occlusal reduction using a tapered diamond bur. Reduce proximal areas by approximately 0.5 mm to clear the contact area. Crown Placement \& Cementation: Ensure a snug fit of the selected crown. Apply a thin layer of glass ionomer cement inside the crown. Seat the crown firmly using finger pressure. Have the child bite down gently to ensure proper seating. Final Adjustments \& Cleanup: Remove excess cement with floss or an explorer. Verify the crown's fit, occlusion, and stability.

Group B: Preformed Zirconia Crown - Assigned Intervention) Crown Selection: Measure the mesiodistal width using calipers to select the appropriate crown. If a mesial or distal wall is missing, use the contralateral tooth for size selection. Choose the one that closely matches the mesiodistal width. Select the smallest crown that preserves proximal contacts. Tooth Preparation: Reduce the occlusal surface by 1.5-2 mm using a tapered diamond bur. Reduce interproximal areas by 1-1.5 mm, ensuring a feather-edge finish. Perform a 1-2 mm subgingival preparation in passively placed fissure bur. Crown Placement \& Passive Fit Check: Place the selected crown on the prepared tooth. Cementation of the Crown: Apply a thin layer of glass ionomer cement inside the crown. Seat the crown with passive finger pressure. Have the child bite down gently to ensure seating.