Methods: CeTZP/A (P-nanoZR, Panasonic Healthcare) were fabricated by C-Pro system (Panasonic Healthcare). The specimen was embedded in an acrylic tube, and then poured into a cold curing acrylic resin (Palapress vario, Heraeus Kulzer). We applied seven kinds of surface modifications to CeTZP/A. NON: sintered CeTZP/A, ASB: NON+sand-blasting with 110µm alumina (Rocatec pre, 3M ESPE), MDP: ASB+phosphoric monomer (Epricord, Kuraray), SLP: ASB+silica coated by Silano pen (Silano pen, Bredent), TBS: tribochemical treatment by 30µm particle (Rocatec soft, 3M ESPE), TBL: tribochemical treatment by 110µm particle (Rocatec plus, 3M ESPE), and CBT: TBS+phosphoric monomer. SLP, TBL, TBS, and CBT were applied silane coupling agent (Espesil, 3M ESPE). A titanium cylindrical specimen with a sandblasted surface was bonded to the CeTZP/A by a resin cement (Linkmax, GC). After storing 37ºC water for 24 hours, or suffered thermal cycles (104 cysles), then shear bond test was performed by a universal testing machine at l mm/min. Shear bond strength (SBS) was analyzed statistically using the Tukey’s multiple comparison test.
Results:
SBSs of CeTZP/A with several surface modifications was showed in Table
|
NON |
ASB |
MDP |
SLP |
TBL |
TBS |
CBT |
24h |
5.84±2.09 |
21.05±4.58 |
55.56±9.78 |
59.18±4.85 |
24.49±5.72 |
37.16±6.22 |
68.48±5.30 |
TC10000 |
0 |
21.36±6.14 |
66.03±7.17 |
57.59±12.77 |
40.08±10.29 |
53.41±12.92 |
84.38±6.71 |
CBT showed the highest SBS and superior bonding durability. NON could not withstand the thermal stress, all specimens were debonded.
Conclusions: Surface modifications applied with CBT treatment for CeTZP/A could enhance the bonding characteristics and durability.