Preparation Time Of Bioflx Crowns Compared To Zirconia Crowns On Primary Molars

Inclusion Criteria: * Children aged between 4 and 8 years with a primary molar that needs to be covered by a crown. Medically healthy children (ASA I or II according to the American Society of Anesthesiologists classification). Children whose parent or guardian is willing to sign an informed consent. Children whose parent or guardian are willing to comply with follow-up visits. Frankl's positive and definitely positive patient. Exclusion Criteria: * Molars with severe structural loss that may compromise crown retention. Children with poor oral hygiene that may contribute to higher plaque levels and affect the clinical outcomes of the crown restorations. Children with a history of allergies; known allergies to dental local anesthesia or to the materials used in Biofix crowns. Children with any systemic conditions or disabilities that may affect their ability to participate in the study.