Clinical performance of crowns fabricated using different method in restoring pulp treated primary molars.

INTERVENTION: Eligible teeth with cavitated carious lesion needed for pulp treatment and full coverage restoration with crowns in primary teeth will be randomly divided into 3 groups: ‐ Selected teeth crowned with poly methyl methacrylate (PMMA) based crowns fabricated using Computer‐Aided Design/Computer‐Assisted Manufactured (CAD\CAM), arm 1 ‐ Selected teeth crowned with using three dimensional printable bio‐compatible light curing composite crowns fabricated using three dimensional dental printer(3D Dental printer), arm 2 ‐ Selected teeth crowned using direct resin composite Celluloid crowns , arm 3 Each participant will be assigned to one treatment group to avoid the possible synergetic effect of the different agents. Local anesthesia was achieved. The teeth were isolated using a rubber dam. The selected extensively carious primary molars will be endodontically treated and restored with glass‐ionomer cement (Fuji IX, GC, Tokyo, Japan), tooth preparation will be performed and an impression is taking, then the crowns would be fabricated in dental lab in arm 1 and arm 2, however, in arm 3 the teeth crowned using direct resin composite strip crown without impression and dental lab works. All procedures will be administered by pediatric dentist All the crowns will be evaluated at baseline and then at 3, 6, and 12 months using ‘modified FDI by two independent investigators for clinical success and quality of the crowns. CONDITION: Oral and Gastrointestinal ‐ Other diseases of the mouth, teeth, oesophagus, digestive system including liver and colon Primary teeth crowns; ; Primary teeth crowns PRIMARY OUTCOME: Crown durability; The measure will be done by blinded investigators using United States Public Health Service (USPHS) by two independent investigators for clinical success and quality of the crowns.[(T0) Baseline and re‐evaluate in three times interval stages:; (T1) 3 months after cementing the crowns; (T2) 6 months after cementing the crowns; (T3) 12 months after cementing the crowns; ] gingival assessment; The measure will be done by blinded investigators using United States Public Health Service (USPHS) by two independent investigators for clinical success and quality of the crowns.[(T0) Baseline and re‐evaluate in three times interval stages:; (T1) 3 months after cementing the crowns; (T2) 6 months after cementing the crowns; (T3) 12 months after cementing the crowns] SECONDARY OUTCOME: parents post‐operative acceptability and dental chair side time, ; Assessment using Visual analogue scale (VAS) scale ; [Baseline, immediately after cementing the crowns] secondary caries ; Assessment according to modified United States Public Health Service (USPHS).[(T0) Baseline and re‐evaluate in three times interval stages: ; (T1) 3 months after cementing the crowns ; (T2) 6 months after cementing the crowns ; (T3) 12 months after cementing the crowns] INCLUSION CRITERIA: 1. extensively carious primary second molar (more than two carious surfaces) requiring endodontic treatment and crowning. 2. Good oral hygiene. 3. Co‐operative patients approving the trial (definitely positive‐ positive) according to the Frankl behavior classification scale..