PURPOSE The null hypothesis was tested: There is no difference between two all-ceramic crown systems, the Cerec method (CHAIR) and the IPS Empress method (LAB), with respect to occlusal precision and time expenditure for the dentist. METHODS 20 casts representing clinical situations were mounted in semi-adjustable articulators to serve as simulation models. The left lower first molars were pr...

This in-vitro study aimed to investigate whether intraoral scanners (IOS) are suitable for wear measurement compared optical profilometry (WLP). A zirconia cast representing the teeth (24–28) was fabricated. It digitized six times using three different scanners, Cerec Omnicam AC (OC), Trios 3 (Tr3), and True Definition (TD). The scans were conducted at baseline (t0) stages of simulated (t1–t3),...

Christian Brenes: CAD/CAM MATERIALS AND TECHNOLOGIES FOR ALL CERAMIC RESTORATIONS: A REVIEW OF THE LITERATURE (Under the direction of Ibrahim Duqum) Objectives: Evaluate the marginal fit of CAD/CAM all ceramic crowns made from lithium disilicate and zirconia using two different fabrication protocols (model and model-less). METHODS: Forty anterior all ceramic restorations (20 lithium disilicate,...

PURPOSE This in-vitro study aimed to evaluate the fracture resistances and failure modes of endodontically treated mandibular premolars restored with endocrowns and conventional post-core retained crowns. MATERIALS AND METHODS Thirty mandibular premolars were assigned into three groups (n=10): GI, intact teeth; GE, teeth with endocrowns; GC, teeth with conventional post-core supported crowns....

We model inter-individual differences in preferences for redistribution as a function of (a) selfinterest; (b) stable ideological traits; (c) subjective perceptions of the relative importance of the main determinants of income differences (luck, effort, talent). Individuals base the latter on information obtained from their reference group. We analyse the consequences for redistributive prefere...

PURPOSE To investigate the buffering capacity of restorative materials during a simulated carious and intrinsic erosive attack. MATERIALS AND METHODS Cavities with a volume of 130 μl were milled (Cerec MC XL) out of blocks of Ceram X Mono (CM), Quixfil (QX), Filtek Supreme (FS), Apa Fill 3 (AF), an experimental dual-curing composite containing a bioactive glass (EX), Dyract eXtra (DY), Beauti...

Introduction: This in vitro study investigates the marginal and internal fit of indirect class II composite restorations. Two different processes for chair-side restorations were compared. In group A, the restorations were fabricated using CAD/CAM technology (Cerec, Sirona, Germany, Bernsheim) and in group B they were made by hand (GrandioSO Inlay System, VOCO GmbH, Germany, Cuxhaven). Methods:...

introduction: this in vitro study investigates the marginal and internal fit of indirect class ii composite restorations. two different processes for chair-side restorations were compared. in group a, the restorations were fabricated using cad/cam technology (cerec, sirona, germany, bernsheim) and in group b they were made by hand (grandioso inlay system, voco gmbh, germany, cuxhaven). methods:...

OBJECTIVES This study evaluated the strength and fracture pattern of monolithic posterior CAD/CAM crowns hypothesizing that zinc-phosphate cemented lithium disilicate crowns might show the same fracture strength as adhesively cemented crowns. METHODS Two sets of monolithic posterior crowns each with uniform occlusal and lateral wall thickness of 1.5mm were fabricated from three types of block...

the rehabilitation of heavily abraded occlusion in patients with parafunctional habits is a restorative challenge to the dentist. use of all-ceramic systems in such cases is widely considered, but uncertainty over their resistance hinders their broad use. the authors would like to illustrate a possible approach by mixing two all-ceramic systems based on zirconium dioxide and lithium disilicate....