For children’s overall development, maintaining a healthy primary dentition is crucial. Three crucial factors are preservation of tooth structure, restorative durability, and parental satisfaction. In paediatric dentistry, several methods for full-coverage restorations have been developed.Aim is to evaluate and compare the clinical success and periodontal health of children after restoring primary molars with stainless steel crown or zirconia crown or edelweiss pediatric crown (edelweiss dentistry ®) using plaque index(PI) and gingival index(GI) and simplified oral health index(OHI -S) at one,three,six &twelve month interval.The present study is a randomised controlled clinical trial which will be conducted in the Department of Paediatric and Preventive Dentistry, Faculty of Dental Sciences, King George’s Medical University in Lucknow, Uttar Pradesh.. All patients will be selected after obtaining detailed history and thorough clinical examination. All children had at least one decayed primary molar teeth requiring full coverage restoration and an antagonist tooth and met the remaining inclusion criteria: willingness to participate in the study and to continue with the follow-up appointments.Before beginning their treatments, children, along with their parents, received a standard oral hygiene education, which consisted of a brushing demonstration by a postgraduate dental student on a model only once.Throughout the follow-ups, parents were warned when signs of gingival inflammation were present or plaque control was inadequate.The data for each tooth will be recorded on individual data record sheet. The final data will be transferred to master data sheet. The data thus obtained will be subjected to statistical analysis