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Simplicity references

 
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john kanca



Joined: 14 May 2005
Posts: 6346

PostPosted: Sat May 21, 2005 10:40 am    Post subject: Simplicity references Reply with quote

This article demonstrated that Simplicity could etch unground enamel as well as H3PO4.

Oper Dent. 2004 May-Jun;29(3):309-16.

Aggressiveness of self-etch adhesives on unground enamel.

Tay FR, Pashley DH, King NM, Carvalho RM, Tsai J, Lai SC, Marquezini L Jr.

Faculty of Dentistry, University of Hong Kong, Hong Kong SAR, China. kfctay@hknet.com

Manufacturers of mild self-etch adhesives advocate the adjunctive use of phosphoric acid etching when bonding to unground enamel. This study tested the null hypothesis that there is no difference between the recently introduced, more aggressive self-etch adhesives and a total-etch adhesive in bonding to unground enamel. The ultrastructure and microtensile bond strengths (microTBS) of Xeno III (Dentsply) and Simplicity (Apex Dental Materials), bonded to unground enamel, were examined after thermocycling. Clearfil SE Bond (Kuraray), a mild self-etch adhesive, was used as the negative control, and One-Step (BISCO), a total-etch adhesive bonded to phosphoric acid-etched unground enamel, was used as the positive control. Differences in the thickness of enamel hybrid layers were observed and the aggressiveness of apatite dissolution in the four adhesives.
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john kanca



Joined: 14 May 2005
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PostPosted: Sat May 21, 2005 10:43 am    Post subject: Reply with quote

This article shows Simplicity bond strengths to be immersion-stable over six months.

IADR 2004

2662 Effect of storage on bond strength of a self-etching adhesive

J. KANCA, private practice, Middlebury, CT, USA
Objective: The purpose of this study was to examine the effect of various storage times on the shear bond strength of a self-etching adhesive.
Materials and Methods: Human molar teeth were embedded in autopolymerizing acrylic and ground to expose adequate dentin and enamel surfaces for bonding. The teeth were randomly separated into 10 groups, five dentin and five enamel, to be bonded with Simplicity. Each group consisted of ten samples. The adhesive was applied per manufacturer's instructions. Sample fabrication was done according to the Ultradent method. The adhesive was light cured and then the bonding mold (inside diameter: 2.3798 mm) was positioned and Z100 composite inserted and light-cured. Samples were then separated into five groups: 1) tested immediately after bonding, 2) tested 2 hours after bonding, 3) tested 24 hours after bonding 4) tested 30 days after bonding, and 5) tested 6 months after bonding. Teeth were stored in distilled water at 37 degrees Centigrade. The samples were subjected to shear testing using a Universal testing machine with a notched shear blade and a crosshead speed of 1 mm/min. Load at failure was recorded in Newtons and converted into shear bond strength in MPa.
Results: Shear bond results were: Immediate Dentin (d) 27.6 (+/- 2.9), Immediate enamel (e) 25.8 (+/- 1.6); 2 hour (d) 37.4 (+/- 1.9), (e) 37.8 (+/- 3.7); 24 hour (d) 38.2 (+/- 2.6), (e) 37.2 (+/- 3.4) ; 30 day (d) 37.5 (+/- 3.0), (e) 36.7 (+/- 3.7); 6 month (d) 35.5 (+/- 2.3), (e) 36.1 (+/- 3.2). The immediate values were significantly lower than for any other period, but the other groups were not statistically different from each other.
Conclusion: The shear bond strengths of Simplicity were storage stable over the immersion period.
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john kanca



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PostPosted: Sat May 21, 2005 10:45 am    Post subject: Reply with quote

This article showed that adding the additional coat of Sim 2 and not light-curing it allowed a self-cure composite to stick to Simplicity with high bond strengths.

IADR 2005

2559 Improving bond of self-cure composite to no-rinse adhesive
J. KANCA, Private practice, Middlebury, CT, USA
Objective: Self-cure materials are often not able to bond reliably to no-rinse adhesives. It is hypothesized that the oxygen-inhibited layer might adversely affect such bonding, and that its removal might improve bond strengths.

Materials: The no-rinse adhesive Simplicity (Apex) was used, along with the self-cure composites Core Paste (CP; Den-Mat, Santa Maria CA) and Ti-Core (TC: Fast set, gray; Centrix, Wallingford, CT)

Methods: Simplicity (S) was applied to 98 mounted dentin specimens, 7 per group. The oxygen-inhibited layer was either not removed (n), or removed with various treatments, including simple wiping with a cotton pellet (cp), and using different solvents such as ethanol (cpe), acetone (cpa). A flowable composite (f) was applied in two groups prior to placement of the self-cure composites to determine effect on bond strengths. Self-cure composites were applied to the treated adhesive and shear bond strengths measured after 10 minutes.

Results: The bond strengths (mPa + SD) were: S/n/CP: 2.6 (+0.5), S/n/TC: 1.7 (+0.4), S/cp/CP: 22.4 (+ 2.Cool, S/cp/TC: 16.3 (+ 2.Cool, S/cpe/CP 14.8 ( + 4.0), S/cpe/TC: 16.9 (+ 1.1), S/cpa/CP 20.7 ( + 2.5), S/cpa/TC 15.1 (+ 3.2), S/f/CP 29.2 (+ 1.1), S/f/TC 23.6 (+ 3.7)

Conclusions: Removal of the oxygen inhibited layer resulted in a highly significant improvement in bond strengths between the self-cure and the no-rinse adhesive. The application of a flowable composite also improved bond strength in a highly significant manner.
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john kanca



Joined: 14 May 2005
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PostPosted: Sat May 21, 2005 10:46 am    Post subject: Reply with quote

This article showed Simplicity to be at least the equal of OneStep immediately and at seven days.

IADR 2004

0465 Self-etch adhesive bond strength at two time intervals
J. PETKEVIS1, M. ALFARO1, E.H. DOHERTY1, G. KUGEL2, and J. KANCA3, 1 Tufts University, Boston, MA, USA, 2 Tufts University School of Dental Medicine, Boston, MA, USA, 3 private practice, Middlebury, CT, USA
Objective: The purpose of this study was to investigate the dentinal shear bond strength of the self-etch adhesive Simplicity at two different times after bonding using One-step as a control.

Materials and Methods: Molar and premolar teeth were mounted in acrylic and ground to expose adequate dentin surface for bonding. Dentin surfaces were roughened with 320 grit Si-C paper. The teeth were randomly separated into two groups to be bonded with either a) Simplicity or b) One Step. Adhesives were applied per manufacturer's instructions. A bonding mold (inside diameter: 2.3798 mm) was positioned onto the flat dentinal surface, the adhesive was light cured, and Z100 composite was placed into the mold until the cylinder was ˝ full. The composite was cured according to manufacturer's instructions, and the mold was removed. Samples were then separated into two groups: 1) tested immediately after bonding 2) tested 7days after bonding. The samples were shear tested using a notched shear apparatus in an Instron Model 4202 with a crosshead speed of 1 mm/min. A Paired samples t-test was used to determine significance between groups.

Results: The average shear bond strengths for Simplicity and One Step tested immediately and after 7 days are shown below:

Immediate testing Simplicity 28.5 MPa (±6.6) One Step 25.3 MPa (±4.6)

7days Simplicity 33.7 MPa (±6.Cool One Step 29.2 MPa (±4.9)

Results: There was no statistically significant difference between Simplicity and One Step when the samples were tested immediately after bonding (p=0.2281). Simplicity achieved a bond strength statistically greater than One Step when tested 7 days after bonding (p=0.0435).

Conclusion: Simplicity compares favorably to One Step when tested for shear bond strength immediately after bonding and seven days after bonding.
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