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In this study, the effect on the fracture load of inlay-retained composite fixed partial dentures（FPDs）caused by reinforcing them with fiber-reinforced composite（FRC）in different positions was examined. Experimental FPDs were fabricated using Estenia/EG Fiber（Kuraray Medical） . Pontic reinforcement was then performed in one of the following three ways: reinforced the central area in a single line or in double straight lines, or reinforced the bottom in a curved line. The finding was that, when the area ranging from the connector to the bottom of the pontic was reinforced with FRC in a curved line, the fracture load of the FPDs tended to become higher. In addition, the FPDs fractured mainly at the veneering composite of the connector area. Based on the results of this study, it was concluded that reinforcement using FRC is effective, and that the veneering composite in the connector area needs to have sufficient strength to prevent the fractures.

Two-dimensional finite element models were created for a three-unit posterior fixed partial denture.An experimental resinimpregnated glass fiber was used as the fiber-reinforced composite (FRC) for the framework. The FRC was evaluated using varying combinations of position and thickness, alongside with two types of veneering composite.A load of 50 N simulating bite force was applied at the pontic in a vertical direction.Tensile stress was examined using a finite element analysis program.Model without FRC showed tensile stress concentrations within the veneering composite on the cervical side of the pontic -from the connector area to the bottom of the pontic. Model with FRC at the top of the pontic had almost the same stress distribution as the model without FRC. Models with 0.4-0.8 mm thick FRC positioned at the bottom of the pontic showed maximum tensile stresses reduced by 4-19% within the veneering composite.

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