Abstract:

Objective To analyze the effect of ceramic onlay to repair serious defects in young permanent molars. Methods Sixty patients with defects in young permanent molars were selected. The patients were randomly divided into two groups. One group was restored with ceramic onlay, and the other used resin composite to direct filling. Follow-up visit was conducted at 3, 6, 12, and 24 months after treatment. Modified USPHS/Ryge criteria were used to evaluate the effect of restoration. The occlusal courses were recorded by the T-Scan Ⅲ system in intercuspal position. Gingival and food impaction were recorded. The effect of the two restorative methods, the recovery of occlusal function, and the gingival and approximal conditions were analyzed. Results At 12 months after restoration, the marginal fitness in the onlay group was significantly better than that in the resin group (P<0.05). At 12 and 24 months after restoration, the surface smoothness in the onlay group was significantly better than that in the resin composite group (P<0.05). At each follow-up visit, the resin group had significantly lower percentage of occlusal force than contralateral molar (P<0.05). The percentage of occlusal force in the onlay group and the contralateral molar showed no statistical difference (P>0.05). The gingival and approximal conditions also demonstrated no statistical differences (P>0.05). Conclusion The ceramic onlay repair method is better than resin composite filling in marginal fitness, surface smoothness, and recovery of the occlusal function when restoring young permanent molars with serious defects.

Key words: young permanent molar, dental defect, resin composite filling, ceramic onlay