1006 CAD-CAM ceramic crown retention of resin cements

Friday, March 23, 2012: 3:30 p.m. - 4:45 p.m.
Presentation Type: Poster Session
D. KOJIC, S. SINGHAL, S. JANYAVULA, D. CAKIR, P. BECK, L. RAMP, and J. BURGESS, University of Alabama at Birmingham, Birmingham, AL

Objectives: To measure retention of CAD-CAM e.max (Ivoclar Vivadent) and Lava (3M-ESPE) crowns using three resin luting agents with and without surface priming.

Methods: Extracted molars (n=10) were embedded in PVC cylinders with acrylic resin and placed into a lathe to produce a uniform crown preparation (20�-taper). Following the orientation groove placement(69L bur), preparations were scanned using CEREC 3D/Sirona (e.max crowns) and LAVA COS/3M ESPE (LAVA crowns).� A CAD-CAM Milling Machine produced crowns. Preparations were imaged with digital microscope (Keyence/VHX-600) at 20X magnification and the surface area of each preparation calculated.� The bonding area was used to calculate bond strength by dividing the failure load with bonded surface area. Crowns were cemented using temporary cement (RelyX TempE/3M ESPE), stored (distilled water/37�C/7days), cleaned, sandblasted (Al2O3 /50�/35psi/10sec),primed and cemented(table). Specimens were stored (distilled water/37�C/24h) before debonding in tension at a cross-head speed of 5mm/min (INSTRON Model/5565). Data were compared with 2-way ANOVA and Tukey-Kramer post-hoc test(p=0.05).

Results: (Mean�SD)

Experimental Groups

Parkell

e.max

Zirconia(LAVA)

����� Force(N)

Stress(MPa)

����� Force(N)

Stress(MPa)

C&B Metabond

 

Primer

��649.9�270

5.4�2

479.6�150

� 3.93�1.2

No-Primer

183.3�66

1.8�0.6

� 397.7�181

3.47�1

Metal-Primer

 

 

423.1�143

3.36�1

SEcure

 

Primer

� 459.6�155

3.8�1

353.79�166

2.63�1

No-Primer

194.9�91

1.70�0.8

350.37�151

2.56�1

Metal-Primer

 

 

�390.71�184

3.11�1

Brush&Bond/Secure

 

Primer

� 441.7�181

3.9�2

556.64�177

4.16�1

No-Primer

163.3�70

1.4�0.6

�505.69�201

3.91�1

Metal-Primer

 

 

509.19�222

3.71�1

Brush&Bond/Hyperfil

Primer

� 485.7�140

4�1

541.46�137

3.98�1

No-Primer

138.5�77

1.3�0.7

267.09�124

1.90�0.7

Metal-Primer

 

 

359.25�159

2.49�0.9

Conclusion:

e.max: Groups bonded with primer produced higher retention compared to no primer groups (p<.05).

Zirconia(LAVA):

Load Failure: No significant difference (p>0.05) was observed among groups except Brush&Bond/Hyperfil/(No Primer and Metal Primer), Brush&Bond/(Hyperfil/No Primer and Secure /Metal Primer), Brush&Bond/(Hyperfil/No Primer and Secure/Primer).

Stress: No significant difference (p>0.05) was observed among groups except C&B Metabond/(No Primer;Primer) and Brush&Bond/Hyperfil/No primer, Brush&Bond/Hyperfil/(No Primer and Primer), Brush&Bond/(Hyperfil and Secure)/(No Primer and Primer) showed significance. Supported in part �by a grant from Parkell.

This abstract is based on research that was funded entirely or partially by an outside source: Grant form Parkell Inc

Keywords: Adhesion, Biomaterials, CAD/CAM, Cements and Ceramics