To Evaluate Clinical Performance of Preformed Zirconia Crowns, Computer-aided Design and Computer-aided Manufacturing Zirconia Crowns, and Bioflx Crowns in Primary Molars Postendodontic Therapy

include affordability, reliability, and durability, making them a preferred option for interim full-coronal coverage. 5Substantial scientific evidence supports the use of SSCs, especially in young children at high risk for dental caries.However, despite these benefits, some practitioners are hesitant to use them due to drawbacks such as their unaesthetic metallic appearance and longer chairside time. 5n esthetic alternative to SSCs is zirconia crowns.These are more widely adopted by clinicians as zirconia crowns overcome the disadvantages of SSCs.These are more esthetic to the patient and the chairside time is also reduced. 5Zirconia crowns, often IntroductIonDental caries continues to be one of the most widespread diseases affecting young children.In primary teeth, the progression of caries can be soft once it begins.Early childhood caries (ECC) is a major global health concern, occurring 5 times more frequently than asthma and 20 times more often than juvenile diabetes. 1ECC significantly affects the quality of life of both the children suffering from it and their families.Dental caries can affect the primary dentition soon after eruption if adequate hygiene habits and healthy nutrition are not established at an early age.Although preventive care has improved and led to a decline in dental caries among children under the age of 3, research continues to show that caries remains the most prevalent oral health issue among children in many regions worldwide. 2,3Untreated decay in primary teeth can lead to pain, high treatment costs, missed school or work, and future caries risk.Primary teeth are essential for chewing, speech, esthetics, and maintaining space for permanent teeth, making their timely care crucial. 4tainless steel crowns (SSCs) are the most widely used restorations for preserving and restoring severely decayed or damaged primary teeth following endodontic treatment.Introduced to pediatric dentistry in 1947 by Engel and later popularized by Humphrey in 1950, SSCs have consistently outperformed alternatives like amalgam and composite in terms of strength and longevity for over 50 years.Their key advantages