Evaluation of resin inlay restoration after root canal therapy for deciduous molars

To explore the clinical effect of composite resin inlays in repairing large areas of primary molar defects after root canal treatment to provide a reference for the restoration of carious primary molars.

Thirty-eight primary molars of 32 children were selected as the research objects. Indirect restoration with composite resin inlays was performed after root canal therapy. The clinical efficacy was evaluated in terms of five indices, including restoration retention, marginal integrity, gingival status, anatomical morphology and secondary caries, according to the modified USHPS evaluation criteria, at 6, 12 and 18 months after restoration.

During the 18-month follow-up period, 36 of the 38 teeth were successfully restored, and all the evaluated items reached grade A or B. Six months after the repair, one prosthesis had fallen off, resulting in a success rate of 97.37% (37/38). The success rate remained 97.37% (37/38) 12 months after the repair; 18 months after the repair, another prosthesis had failed (Marginal integrity and anatomical morphology were grade C), reducing the success rate to 94.74% (36/38). There was no significant difference in the success rate of resin inlay repair at 6, 12 or 18 months (χ²＝0.518, P＝0.772).

Composite resin inlay restoration is an alternative method for repairing primary molars with large defects after root canal treatment.