Replacement of a missing molar despite proximal undercuts by using two single-retainer resin-bonded fixed dental prostheses

Aim: The aim of this case report is to present the minimally invasive replacement of a missing molar in the presence of considerable proximal undercuts of the adjacent abutment teeth. The use of two single-retainer resin-bonded fixed dental prostheses (RBFDPs) made this therapy possible. Materials and methods: A missing mandibular right first molar required replacement. Two single-retainer RBFDPs were digitally designed in the shape of half a molar each and were milled using CAD/CAM from monolithic 3Y-TZP zirconia ceramic. The posterior RBFDP portion retained by the second molar was designed in the pontic contact area to create a common path of insertion for the anterior RBFDP portion with the distal surface of the second premolar. A slight interlocking between the proximal contact surfaces of the two pontics was designed to prevent future migration between the split restorations. Precise placement of the two RBFDPs during adhesive luting was ensured with the aid of a positioning splint. Results: The patient was recalled after 10 months and was very satisfied with the minimally invasive molar replacement. Conclusion: Using two single-retainer RBFDPs to replace a molar in a split design enables a minimally invasive posterior tooth replacement despite considerable proximal undercuts of the adjacent abutment teeth. Keywords: resin-bonded fixed dental prostheses (RBFDPs), minimally invasive treatment, split molar, CAD/CAM, proximal undercut, monolithic zirconia (3Y-TZP)