In this study, children of age 04 - 09 yrs who underwent bilateral pulp therapy treated primary second molars who are healthy and co-operative and are willing to be part are been included in the study,children who are medically compromised children and are with para-functional habits. And pulpectomy treated teeth with decay extending beneath the free gingival margin are been excluded from the study.

Children coming to outpatient block in Department of Pedodontics & Preventive Dentistry will be screened. Based on inclusion and exclusion criteria, 20 children will be recruited into study who underwent pulp therapy of the right and left milk tooth of the upper or lower back tooth region with the help of Computer-generated sequence, the children will be allocated into 2 groups using split mouth design.  After doing the tooth preparation  scanning using intraoral scanner then by the CAD-CAM software crowns are designed and printed with 3D printers and  prior to the cementation of the these 3d printed resin crowns the surface treatment of intaglio surfaces  will be done in one group mechanical surface treatment with sandblasting and in another group chemical surface treatment with hydrofluoric acid is done and are cemented to the tooth and their Clinical performance are assessed at using  U.S.P.H.S criteria at duration of 3,6,9,12 months.