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Purpose: To evaluate the one- year clinical performance of the packable bulk fill and nano resincomposite in class I restorations in children and a adolescents.Materials & Methods: (33) pairs of first permanent molars had class I restorations wereplaced in (33) children were selected from Outpatient Clinic, Pediatric Dentistry Department,Faculty of Dentistry, Suez Canal University, each patient received two class I restorations thatwere similar as possible . In all cavities, single bond adhesive (Xeno V+) was applied. One cavity ofeach pair was randomly assigned to be restore with packable bulk fill resin composite (Quixfil) inincrement up to 4 mm . Another cavity was restored with Nano hybrid resin composite (Esthet-Xflow) placed in 2 mm increments. All restorations were evaluated at one week baseline and then onemonth, 3 months, 6 months , 9 months and 12 months . using slightly modified USPHS .Results: At all periods of evaluation, no statistically significant differences were detectedbetween packable bulk fill composite resin and Nano hybrid composite resin in marginal adaptation,surface roughness and caries detection ,whereas statistically significant differences between bothmaterials in anatomical form and marginal discoloration parameters in favor with packable bulkfill. Sensitivity was not reported during all evaluation periods Performance at one week base line, 1month, 3 months, 6 months, 9 months and 12 months for all criteria.Conclusions: The packable bulk- fill composite resin showed highly clinical performance whencompared with Nano hybrid composite resin restorations at one- year follow up. Further studiesnecessary for long term clinical evaluation of these materials.

One Year -Randomized Clinical Trial to Evaluate Packable Bulk fill and Nano Resin Composite in Children and Adolescents