Microtensile bond strength of lithium disilicate to zirconia with the CAD-on technique.

PURPOSE Recently, a novel technique was introduced to combine lithium disilicate and zirconia into one restoration. The purpose of this study was to compare the microtensile bond strength of veneering ceramic to a zirconia core in two techniques: the e.max® CAD-on technique and the Press-on technique. MATERIALS AND METHODS Group A was prepared by veneering sintered zirconia blocks (e.max® ZirCAD) with lithium disilicate blocks (e.max® CAD) using the CAD-on technique according to manufacturer's instructions. Group B was prepared by taking sintered e.max® ZirCAD blocks and veneering them with fluorapatite glass-ceramic (e.max® ZirPress) using the Press-on technique according to manufacturer's instructions. Each block was loaded in a dynamic cyclic loading machine. The blocks were then sectioned into 1 × 1 mm(2) beams (n = 43) using a precision saw, thermocycled, and loaded in tension until failure on a universal testing machine. A mean and standard deviation were determined per group. Data were analyzed using an unpaired t-test (α = 0.05). RESULTS The mean microtensile bond strengths were 44.0 ± 13.8 MPa for the CAD-on technique and 14.9 ± 8.8 MPa for the Press-on technique. Significant differences were found between the two groups (p = 2.7E-19). CONCLUSIONS The CAD-on technique (lithium disilicate/zirconia) resulted in greater microtensile bond strength than the Press-on technique (fluorapatite glass-ceramic/zirconia).

[1]  Irena Sailer,et al.  Five-year clinical results of zirconia frameworks for posterior fixed partial dentures. , 2007, The International journal of prosthodontics.

[2]  Josef Schweiger,et al.  High-strength CAD/CAM-fabricated veneering material sintered to zirconia copings--a new fabrication mode for all-ceramic restorations. , 2009, Dental materials : official publication of the Academy of Dental Materials.

[3]  C. Feng,et al.  The effect of core material, veneering porcelain, and fabrication technique on the biaxial flexural strength and weibull analysis of selected dental ceramics. , 2012, Journal of prosthodontics : official journal of the American College of Prosthodontists.

[4]  Florian Beuer,et al.  Load-bearing capacity of all-ceramic three-unit fixed partial dentures with different computer-aided design (CAD)/computer-aided manufacturing (CAM) fabricated framework materials. , 2008, European journal of oral sciences.

[5]  P. Coelho,et al.  Modified Y-TZP Core Design Improves All-ceramic Crown Reliability , 2011, Journal of dental research.

[6]  B. Norling,et al.  The effect of surface treatment of the interfacial surface on fatigue-related microtensile bond strength of milled zirconia to veneering porcelain. , 2012, Journal of prosthodontics : official journal of the American College of Prosthodontists.

[7]  M V Swain,et al.  Unstable cracking (chipping) of veneering porcelain on all-ceramic dental crowns and fixed partial dentures. , 2009, Acta biomaterialia.

[8]  D. Edelhoff,et al.  Three-year clinical prospective evaluation of zirconia-based posterior fixed dental prostheses (FDPs) , 2009, Clinical Oral Investigations.

[9]  K J Anusavice,et al.  Structural reliability of alumina-, feldspar-, leucite-, mica- and zirconia-based ceramics. , 2000, Journal of dentistry.

[10]  Florian Beuer,et al.  Precision of fit: zirconia three-unit fixed dental prostheses , 2009, Clinical Oral Investigations.

[11]  Moustafa N. Aboushelib,et al.  Microtensile bond strength of different components of core veneered all-ceramic restorations. , 2005, Dental materials : official publication of the Academy of Dental Materials.

[12]  Charles J Goodacre,et al.  Clinical complications in fixed prosthodontics. , 2003, The Journal of prosthetic dentistry.

[13]  Irena Sailer,et al.  Randomized controlled clinical trial of zirconia-ceramic and metal-ceramic posterior fixed dental prostheses: a 3-year follow-up. , 2009, The International journal of prosthodontics.

[14]  M. Schmitter,et al.  In vitro chipping behaviour of all-ceramic crowns with a zirconia framework and feldspathic veneering: comparison of CAD/CAM-produced veneer with manually layered veneer. , 2013, Journal of oral rehabilitation.

[15]  A. Azari,et al.  The effect of multiple firings on microtensile bond strength of core-veneer zirconia-based all-ceramic restorations. , 2013, Journal of Prosthodontics.

[16]  I. Denry,et al.  State of the art of zirconia for dental applications. , 2008, Dental materials : official publication of the Academy of Dental Materials.

[17]  Arvind Shenoy,et al.  Dental ceramics: An update , 2010, Journal of conservative dentistry : JCD.

[18]  Michael C DiTolla.  A new metal-free alternative for single- and multiunit restorations. , 2002, Compendium of continuing education in dentistry.

[19]  L. Gauckler,et al.  Prospective clinical study of zirconia posterior fixed partial dentures: 3-year follow-up. , 2006, Quintessence international.

[20]  Moustafa N. Aboushelib,et al.  Microtensile bond strength of different components of core veneered all-ceramic restorations. Part II: Zirconia veneering ceramics. , 2006, Dental materials : official publication of the Academy of Dental Materials.

[21]  M. Schmitter,et al.  Chipping behaviour of all-ceramic crowns with zirconia framework and CAD/CAM manufactured veneer. , 2012, Journal of dentistry.

[22]  A. Vichi,et al.  Microtensile bond strength of three different veneering porcelain systems to a zirconia core for all ceramic restorations. , 2010, American journal of dentistry.

[23]  Moustafa N. Aboushelib,et al.  Effect of zirconia type on its bond strength with different veneer ceramics. , 2008, Journal of prosthodontics : official journal of the American College of Prosthodontists.

[24]  J. W. Farah,et al.  Comparative reliability analyses of zirconium oxide and lithium disilicate restorations in vitro and in vivo. , 2011, Journal of the American Dental Association.

[25]  D. Watts,et al.  Experimental and FE shear-bonding strength at core/veneer interfaces in bilayered ceramics. , 2011, Dental materials : official publication of the Academy of Dental Materials.