FRACTURE STRENGTH OF CAD/ CAM FABRICATED ZIRCONIUM- OXIDE COPINGS IN THE MOLAR AREA

Background and Aim: High strength ceramics fabricated with CAD/ CAM technology have widely extended the applications of all ceramic restorations from inlay, onlay and single crowns to multi-unit bridges, showing more favorable mechanical characteristics compared to the conventional metal ceramic materials. The aim of this in-vitro study was to investigate the fracture strengths of high strength CAD/ CAM fabricated zirconium oxide copings with two different core structure materials in the molar area. Materials and Methods: Ten metal and twenty DC-Tell dies produced by the means of Lava® procedure for the mandibular I. molar were manufactured. Partially stabilized zirconia blanks (DC-Zircon) have been used to prepare the ceramic copings. Thermo-cycling was for done to ten metal and ten DC-Tell die specimens. All the samples were then tested for their fracture characteristics with a universal testing machine (Zwick-010, Ulm, Germany). Results: The fracture strength results of the DC-Tell samples with thermo-cycling showed the lowest values (753,60 N) and the metal samples showed the highest values (2282,20 N). (p = 0.001) Conclusion: While constructing cores under crowns with CAD/ CAM fabricated zirconium-oxide copings, good mechanical properties and clinical successes can be achieved with metallic materials.

[1]  Sunghuen Kim,et al.  In vitro evaluation of fracture strength of zirconia restoration veneered with various ceramic materials , 2012, The journal of advanced prosthodontics.

[2]  G. Marshall,et al.  Functional Remineralization of Dentin Lesions Using Polymer-Induced Liquid-Precursor Process , 2012, PloS one.

[3]  D. Edelhoff,et al.  In vitro performance of full-contour zirconia single crowns. , 2012, Dental materials : official publication of the Academy of Dental Materials.

[4]  Andreas Bindl,et al.  Survival of ceramic computer-aided design/manufacturing crowns bonded to preparations with reduced macroretention geometry. , 2005, The International journal of prosthodontics.

[5]  Allan W Estey,et al.  Tensile bond strengths of five luting agents to two CAD-CAM restorative materials and enamel. , 2003, The Journal of prosthetic dentistry.

[6]  Markus B Blatz,et al.  Resin-ceramic bonding: a review of the literature. , 2003, The Journal of prosthetic dentistry.

[7]  M. Kern,et al.  Marginal discrepancies and leakage of all-ceramic crowns: influence of luting agents and aging conditions. , 2002, The International journal of prosthodontics.

[8]  P Pospiech,et al.  Fracture resistance of posterior metal-free polymer crowns. , 2000, The Journal of prosthetic dentistry.

[9]  M. Kern,et al.  Influence of design and mode of loading on the fracture strength of all-ceramic resin-bonded fixed partial dentures: an in vitro study in a dual-axis chewing simulator. , 2000, The Journal of prosthetic dentistry.

[10]  M. Kern,et al.  Bonding to glass infiltrated alumina ceramic: adhesive methods and their durability. , 1995, The Journal of prosthetic dentistry.

[11]  J R Strub,et al.  Influence of water storage and thermal cycling on the fracture strength of all-porcelain, resin-bonded fixed partial dentures. , 1994, The Journal of prosthetic dentistry.

[12]  Scherrer Ss,et al.  The fracture resistance of all-ceramic crowns on supporting structures with different elastic moduli. , 1993 .

[13]  W. Rixmann,et al.  ENTWICKLUNGSSTAND UND PROBLEME DER INTERNATIONALEN KRAFTFAHR ZEUGTECHNIK. BERICHT UEBER DEN XIII. FISITA-KONGRESS IN BRUE SSEL, JUNI 1970. TEIL 2: FRAGEN DER LUFTVERUNREINIGUNG UND D ER SICHERHEIT; TEIL 3: FRAGEN DER SICHERHEIT, BREMSEN, LENKU NG UND FAHRSTABILITAET. , 1970 .

[14]  W. Gernet,et al.  In-vitro-untersuchungen zu vollkeramischen stiftaufbauten aus zirkonoxid , 2003 .

[15]  K. Fischer,et al.  Randdichtigkeit von IPS-Empress-Keramikinlays nach 2-jähriger Wasserlagerung mit und ohne thermische Wechselbelastung , 2003 .

[16]  Heike Rudolph,et al.  CAD/CAM - Neue Technologien und Ent- wicklungen in Zahnmedizin und Zahntechnik , 2003 .

[17]  F. Beuer,et al.  Marginale und innere Passung von CAM-gefrästen Zirkoniumoxid-Einzelkronengerüsten bei unterschiedlichen Präparationswinkeln , 2003 .

[18]  A. Rzanny,et al.  Zur Oberflächenqualität CAD/CAM-gefertigter keramischer Restaurationen nach Politur , 2002 .

[19]  R. Luthardt,et al.  KRONEN AUS HOCHLEISTUNGSKERAMIK : ZIRKONDIOXID-KERAMIK, EIN NEUER WERKSTOFF IN DER KRONENPROTHETIK , 1998 .

[20]  S. Scherrer,et al.  The fracture resistance of all-ceramic crowns on supporting structures with different elastic moduli. , 1993, The International journal of prosthodontics.

[21]  G Sjögren,et al.  A clinical examination of ceramic (Cerec) inlays. , 1992, Acta odontologica Scandinavica.