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 (20ș-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/37șC/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