Abstract: Objective To observe and compare the clinical effects of Z350 and sonicfill resin filling in the treatment of maxillary first molar defect. Methods The maxillary first molars were left after the root canal treatment in the outpatient department. Forty samples were randomly divided into group A and group B. Group A was repaired with Z350, while group B was repaired with sonicfill. The two groups of patients were examined and followed up immediately and 12 months after the repair, and the clinical repair effect of the defects was evaluated by referring to the evaluation criteria of the prosthesis of the United States department of public health. Results There was no significant difference between the two groups in the repair effect immediately and 12 months after the treatment of maxillary first molar root canal. Conclusion Both resins are suitable for the repair of dental defects after the treatment of maxillary first molar root canal with sufficient residual tooth volume, in which sonicfill resin filling operation time is obviously superior.

Key words: resin, after root canal treatment, clinical curative effect