Fatigue behavior of resin-modified monolithic CAD–CAM RNC crowns and endocrowns

Fatigue Failure Load of Lithium Disilicate Restorations Cemented on a Chairside Titanium‐Base

“…First, it warms up a load of specimens for the specified number of cycles. Next, it steps up evenly until reaching the upper limit of the testing . Several studies also employed the stepwise protocol to test restorations to accelerate fatigue failure.…”

Fracture resistance of all‐ceramic crowns based on different preparation designs for restoring endodontically treated molars

“…To provide both an expedient coronal seal and definitive cuspal coverage restoration, the endocrown may provide an efficient treatment option. However, Biacchi and colleagues suggested endocrowns are best limited for molar restoration as bicuspids may present with unfavorable mastication force vectors, with Bindl et al further noting that bicuspids have less available bonding surface, greater height to width ratio, and smaller pulp chamber dimensions which all serve to intensify lever force vectors. These reports were recently reinforced by Guo and colleagues who reported that endocrowns displayed no advantage compared to conventional methods of restoring endodontically treated mandibular bicuspids.…”

“…For the restoration of endodontically treated teeth, CAD/CAM advocates emphasize the “endocrown” method, which consists of a merged crown and core unit adhesively bonded into the pulp chamber and the remaining tooth structure . The endocrown method is said to provide a more conservative option to traditional post and core restorative strategies while providing equitable results . Dejak and Młotkowski using an in silico finite element analysis reported that under simulated masticatory function the endocrown had lower dentin stress concentration than compared to traditional post and core methods.…”

Fatigue Behavior of Different CAD/CAM Materials for Monolithic, Implant‐Supported Molar Crowns

“…In addition, a resin block modified with nanoceramic particles is available for chairside CAD/CAM systems and presents high flexural strength (300 MPa flexural strength) . Its relatively low elastic modulus is intended to prevent biomechanical complications during occlusal loading by mimicking the resilience of the periodontal ligament .…”

“…8,9 Although feldspathic ceramic (118 MPa flexural strength) is a more fragile material than lithium disilicate (609 MPa flexural strength), 10 feldspathic monolithic restorations exhibit resistances comparable to those of lithium disilicate crowns after being cemented with an adhesive luting agent. 11 In addition, a resin block modified with nanoceramic particles is available for chairside CAD/CAM systems 12,13 and presents high flexural strength (300 MPa flexural strength). 10 Its relatively low elastic modulus is intended to prevent biomechanical complications during occlusal loading by mimicking the resilience of the periodontal ligament.…”