The Relation Between Oral Hygiene and Microbial Load in the Oral Cavity After Restoring Primary Molars With Two Types of Ready-made Crowns

Inclusion Criteria: * Participants aged between 4 and 8 years. * Pulp therapy treated primary molars on the contralateral side, requiring a full coverage restoration (split-mouth technique). * No history of any antibiotic consumption 2 weeks before the procedure. * No history of fluoride application 2 weeks before the procedure. Exclusion Criteria: * Special children with physical disabilities or emotional disturbances. * Children are diagnosed with systemic diseases. * Grossly destructed teeth with non-restorable crown structure. * Primary teeth with shedding or pathological tooth mobility.