Title: 0884 - CAD/CAM Lithium Disilicate RBFPD With a Modified Preparation Design: Case Report


Effrosyni Tsitrou (Presenter)
Aristotle University of Thessaloniki

Kimon Pahinis, Nea Moudania National Health Center


Objectives: The development of CAD/CAM technology and the introduction of new ceramic and adhesive materials have made all-ceramic RBFPDs a treatment option. Recent studies show promising results regarding their survival rate. However, no distinct preparation guidelines exist for this type of restorations. A modified design for RBFPD is proposed to increase the strength of the ceramic material. In this study a RBFPD with the proposed preparation design is presented after 5 years of clinical service.

Methods: A missing maxillary right central incisor was replaced with a cantilevered all-ceramic CAD/CAM RBFPD. The left central incisor was used as abutment for the prosthesis and a modified minimal preparation was applied on the palatal surface which also extended up to the middle of the mesial proximal surface. The preparation limited to enamel, had a depth of 0.5mm and a distinct marginal finish of 0.5mm width circumferentially. The margins had 1mm distance from the gingiva and 2mm from the incisal edge. Digital impression, designing and milling of the restoration were performed with the CEREC system (CEREC v3.85, Sirona). Lithium disilicate material (e.maxCAD (A2), Ivoclar-Vivadent) was used for the fabrication of the restoration. Crystallization and characterization were performed according to manufacturers’ recommendations. A resin cement was used for cementation (Variolink II, Ivoclar-Vivadent). Reviews were performed at 6, 12 months and annually up to 5 years. The USPHS criteria were used.

Results: After 5 years of clinical service the prosthesis is still in situ with no evidence of failure. The RBFPD was rated A according to USPHS criteria.

Conclusions: All-ceramic lithium disilicate RBPFD can be a viable minimally invasive treatment modality for the restoration of missing anterior teeth. The proposed preparation design seems to strengthen the design of the RBFPD, as the performance of 5 years of clinical service show. Careful case selection is important.

Disclosure Statement:
The submitter must disclose the names of the organizations with which any author have a relationship, the nature of the relationship, and the clinical or research area involved. The following is submitted: NONE