Introduction: Long-span fixed dental prostheses involving pier abutments present biomechanical challenges due to differential tooth movement, often causing stress concentration and debonding. Incorporating nonrigid connectors can mitigate these complications by acting as stress breakers. Methods: A mandibular pier abutment case was rehabilitated with a digitally designed five-unit FDP using a key–keyway nonrigid connector fabricated via Direct Metal Laser Sintering (DMLS). CAD/CAM technology was used to ensure precision and optimal fit. The connector was positioned between the distal surface of the second premolar and the mesial surface of the first molar pontic. Results: Clinical evaluation demonstrated excellent marginal integrity, occlusal harmony, and patient comfort. The nonrigid connector effectively distributed occlusal loads, minimizing stress on the abutments and preventing debonding. Conclusions: Digitally fabricated nonrigid connectors significantly enhance the biomechanics and longevity of pier abutment prostheses. The use of DMLS offers improved precision and clinical success in modern prosthodontic rehabilitation.
Moungkhom et al. (Sun,) studied this question.