Reliability Testing of Indirect Composites as Single Implant Restorations

Abstract

No significant differences were observed in life and Weibull probability calculations for Ceramage and Diamond Crown veneered onto Ti alloy abutments. Failure modes comprised composite veneer chippings.

Probability of survival of implant-supported metal ceramic and CAD/CAM resin nanoceramic crowns

“…Step-stress accelerated life testing (SSALT) and reliability analysis Three crowns from each group were subjected to single load to fracture testing with a spherical indenter (6 mm diameter, D-2 Steel) positioned at the mesio-lingual cusp at a crosshead speed of 1 mm/min (Model 800R, Test Resources, Inc., Shakopee, MN, USA) [18]. Failure was defined as veneer material fracture.…”

“…Considering that fatigue plays a more relevant role in simulating clinical failures [16], recent studies have evaluated the use of hand-layered indirect composites for implant-supported molar crowns and found promising probability of survival (reliability) when tested under fatigue [17,18]. Given that flaws, such as voids, are inherently introduced when an indirect composite is hand-layered, pressed blocks of resin nanoceramics have been developed for milling through the CAD/CAM process from several companies in attempt to further improve them from a fatigue resistance perspective.…”

Resin composite repair for implant‐supported crowns

“…To standardize the removal of the mesio‐lingual cusp for reliability evaluation of the repaired LU crowns, a block was created using a self‐curing acrylic material (Fastray LC, Bosworth, IL, USA) to allow serial and indexed insertion and removal of crowns in a precision diamond saw machine (Isomet 2000, Buehler, Lake Bluff, IL, USA) [Figure (A–C)]. The size of cusp removal was intended to simulate the approximate fracture sizes initially observed for LU intact tested crowns and from previous fatigue testing of resin composite crowns of the same anatomy and tested under identical step‐stress accelerated‐life testing profiles …”

“…This class of materials is characterized by the presence of polymeric matrices containing predominantly inorganic refractory compounds that may include glasses, ceramics, and glass ceramics . These materials are claimed to have more resiliency compared to ceramics, are easier to mill during computer assisted machining, more easily abraded for occlusal adjustments relative to ceramics, and have shown promising results in preclinical studies involving sliding fatigue testing when compared to metal ceramics for implant‐supported crowns …”

Abutment Design for Implant‐Supported Indirect Composite Molar Crowns: Reliability and Fractography

“…Twenty‐one crowns of each abutment configuration were fabricated. Three crowns were subjected to a single axial load‐to‐fracture test with a flat indenter positioned at the mesiolingual centric holding cusp at a 1 mm/min cross‐head speed (Model 800R, Test Resources, Inc., Shakopee, MN) 19 . Failure was defined as composite chip or bulk fracture, and it was monitored in the load/displacement curves.…”