Impact of a 3D Printed Guide on the Retention and Stability of RPD
Magdalena Česneková, Dr. Jindřich Charvát, Dr. Lucie Himmlová, Dr. Ján Stańo
Introduction
The retention and stability of Removable Partial Dentures (RPDs) are influenced by the functional features and the quality of clasp systems or precise attachments. The ideal path of denture insertion, which is enhanced by guiding planes on natural teeth and/or crown reconstructions, improves RPD retention and stability. Biomechanics are crucial in determining the optimal path of insertion. Forces generated during mastication need to be evenly distributed across the dental arch to prevent stress on abutment teeth and denture-bearing tissues. The evolution of software for 3D RPD design planning includes the provision of an optimal path depicted by parallel pins. The 3D printing process culminates in the production of a plastic guide with visible pins and windows, facilitating precise parallel preparation of guiding planes.
Case Description
A 67-year-old male patient with diagnoses of depression, fear, anxiety, polypharmacy, and psychological trauma from his adolescent years. He is a heavy smoker. His dentition is classified as Kennedy II, III, with extreme attrition and poor oral hygiene. Porcelain Fused to Metal (PFM) crowns, upper complete, and lower partial dentures were fabricated for the patient. After a year of use, the RPD remains stable, with high retention, and is consistently used by the patient.
Discussion
The path of insertion, jaw movement, and distribution of occlusal forces, in conjunction with design planning, provide optimal functionality and maintain the functional occlusion of the remaining dentition. The integration of this new technology enhances the accuracy and effectiveness of prosthetic treatment.