Discus Dental - Clinical Data and Safety

Clinical Studies - Restoratives

Bond strength of Matrixx™ Cabrio™ Bond to dentin
Confidential Report Submitted: 10/25/99

Investigation:
Franklin García-Godoy, DDS,MS
Professor and Director Clinical Materials Research Department of Restorative Dentistry
Mail Code 7890
University of Texas Health Science Center
7703 Floyd Curl Drive San Antonio, Texas 78229-3900, USA

Tel: (210) 567-3533
Fax: (210) 567-3522
E-mail: godoy@uthscsa.edu

PURPOSE

The purpose of this study was to evaluate the shear bond strength of Matrixx Cabrio Bond enamel/dentin adhesive to dentin.

MATERIAL AND METHODS

Excite (Vivadent), Matrixx Cabrio Bond (Discus Dental), Single Bond (3M Co.), One Coat (Coltène), and Prime & Bond NT (Caulk/Dentsply) bonding agents were used. The resin composite Z250 was used with all products.

A total of 40 human, non-carious extracted permanent molars stored in distilled water were used. Flat buccal and lingual enamel surfaces were ground wet on silicon carbide paper ending with the 600-grit. The teeth were then distributed at random into five groups of 8 teeth (16 surfaces) each:

Group 1: Dentin treated with Singe Bond / Z250.
Group 2: Dentin treated with Prime & Bond NT / Z250.
Group 3: Dentin treated with One Coat / Z250.
Group 4: Dentin treated with Excite / Z250.
Group 5: Dentin treated with Matrixx Cabrio Bond / Z250

All materials were handled according to the manufacturers' instructions. A plastic ring (surface area of 3.89 mm2) was placed over the dentin and filled with the resin composite. All excess material was removed from around the ring and then light-cured (Optilux 400, Demetron, Danbury, CT, USA) for two 40-second exposures: one from each side of the ring. Fifteen minutes after cured, all samples were stored in distilled water at room temperature for 24 hours.

The specimens were thermocycled 500 times in water baths of 5° ad 55°C and mounted in paper cups with plaster with the bonded ring-dentin surface area parallel to the shearing rod of an Instron/MTS testing machine.

All samples were sheared with a knife-edged blade running at a crosshead speed of 0.5 mm/min. The results were recorded in megapascals (MPa).

After shearing the specimens, each tooth and resin-dentin interface was evaluated with a stereomicroscope to record the failure mode. Selected samples were also evaluated with a light microscope.

An ANOVA and Student-Newman-Keuls procedure were used to evaluate the results. Results First Testing (Larger testing rings = 6.69 mm2).

RESULTS

First Testing (Larger testing rings=6.69 mm2)

Group Mean (Mpa) S.D.

Single Bond / Z250 15.7 4.9

Prime & Bond NT / Z250 8.4 4.5

One Coat / Z250 12.3 6.5

Excite / Z250 11.2 3.2

Matrixx Cabrio Bond / Z250 15.2 3.6

ANOVA showed statistically significant difference among the groups (P< 0.0001).

Student-Newman-Keuls test (P< 0.05) revealed:

1 vs 2 = Yes 4 vs 2 = No 5 vs 2 = Yes

1 vs 3 = No 4 vs 3 = No 5 vs 3 = No

1 vs 4 = Yes 4 vs 5 = Yes 3 vs 2 = No

1 vs 5 = No

Second Testing (Smaller testing rings=4.46 mm2)

Group Mean (Mpa) S.D.

Single Bond / Z250 23.6 3.2

Prime & Bond NT / Z250 21.6 4.2

One Coat / Z250 20.4 5.4

Excite / Z250 19.5 4.1

Matrixx Cabrio Bond / Z250 24.2 3.3

ANOVA showed statistically significant difference among the groups (P< 0.007).

Student-Newman-Keuls test (P< 0.05) revealed:

1 vs 2 = No 4 vs 2 = No 5 vs 2 = No

1 vs 3 = No 4 vs 3 = No 5 vs 3 = No

1 vs 4 = Yes 4 vs 5 = Yes 3 vs 2 = No

1 vs 5 = No

Third Testing (Smaller testing rings=3.89 mm2)

Group Mean (Mpa) S.D.

Single Bond / Z250 28.5 3.6

Prime & Bond NT / Z250 26.7 3.8

One Coat / Z250 24.4 4.4

Excite / Z250 27.6 4.1

Matrixx Cabrio Bond / Z250 30.3 3.8

ANOVA showed statistically significant difference among the groups (P< 0.001).

Student-Newman-Keuls test (P< 0.05) revealed:

1 vs 2 = No 4 vs 2 = No 5 vs 2 = No

1 vs 3 = Yes 4 vs 3 = No 5 vs 3 = Yes

1 vs 4 = No 4 vs 5 = No 3 vs 2 = No

1 vs 5 = No

Discus:Bond Strength 3rd report.10/25/99.