Evaluation Of Innovative 3D Printed Space Maintainer Versus Conventional One

And will be conducted as follows: * In-Vivo evaluation of the clinical performance of 3D printed space maintainer versus metal band and loop concerning oral hygiene, retention and patient satisfaction. * A total of thirty healthy subjects will be selected from the Pediatric Dentistry and Dental Public Health outpatient clinic, Faculty of Dentistry, Ain Shams University. They will be divided using simple randomization in two groups: Group 1: Children with 3D printed space maintainer (n=15) Group 2: Children with conventional band and loop(n=15)