1005 Effect of Suface Preparations of Stainless Steel Crown on Composite-resin Shear Bond Strength

Friday, March 23, 2012: 3:30 p.m. - 4:45 p.m.
Presentation Type: Poster Session
F. NOURBAKHSH, Pediatric Dentistry Unit, Razavi Hospital, Mashhad, Iran, M. GHAVAM NASSIRI, Restorative Dentistry, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran, B. AJAMI, Pediatric Dentistry, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran, and S. JAFARI, Pediatrics, Ghaem Hospital, Mashhad University of Medical Sceinces, Mashhad, Iran

Stainless steel Crown (SSC) is the most durable restoration for extensively decayed primary teeth but its metallic appearance is displeasing. The purpose of this study was an in-vitro evaluation of shear bond strength of a composite-resin veneer, using different surface treatments of Stainless steel and bonding agents, for possible future development of  producing esthetic SSC.


The samples (n=90) consisted of SSCs (U6,L6 unitek, 3M) monted in molds with flat surfaces projecting above and divided (n=3/gp). In group 1 they were sandblasted ( Dento-prep 402, 5min), in group 2 a hand-made acidic gel (50% H3PO4, 25% HCL, 25%Methanol, 5min) was applied, rinsed and inserted in ultrasonic (18%HCL, 10min) and in group 3 fissure dimond bur (F2M) created roughness (20 times left to right action).Then each group subdivided (n=3sgp) based on bonding agents applied: Singel-bond(3M-ESPE), PanaviaF-2.0(Kurary), All-bond2(Bisco).Then a composite-resin(Heliomolar-A2, Ivoclar) in transparent cylinders (3-3mm) cured to prepared surfaces, incubated (100% humidity 37’, 24h),its shear bond strength measured (Zwick,0.5mm/min) and statistically analyzed (  ANOVA, p<0.05).


There was no correlation between surface treatment and bonding agent variables, So they were studied separately (p>0.05). The mean(SD) shear bond strengths of composite-resin in MPa for groups 1-3 were: 10.76(2.57), 10.19(2.57), 10.97(2.57) and in subgroups 1-3 : 10.74(2.57), 10.76(2.57), 10.40(2.57), which showed, there was no significant difference between shear bond strength of composite-resin when three surface treatments were used and also when  bonding agents applied (p>0.05).


In this study, the composite-resin mean shear bond strengths were statistically similar when three kinds of surface treatments and bonding agents applied. So because of the simple use of Single Bond ( single bottle, one-step) and also availability and cost-effectiveness of bur treatment , this seems to be a choice for chair-side veneering of composite-resin to SSC , but further research is needed.

Keywords: Composites and Stainless steel