Indiana University-Purdue University Indianapolis (IUPUI) / The purpose of this laboratory study was to determine if the bond
strengths of composite resins and unfilled resins was affected similarly
when applied to enamel surfaces which had been previously etched with 50
per cent phosphoric acid. The test specimens were subjected to 24 hours,
30 days, and 6 months storage in water and then subjected to temperature
stress cycling and intermittent tensile stress cycling. A tensile test
was used to measure the bond strengths of the composite resins (Adaptic
and HL-72) and the unfilled resin (Sevriton).
The following results were obtained: (1) Pretreating the enamel surface
with 50 per cent phosphoric acid for 60 seconds significantly increased
the bond strength of composite resins; (2) when placed on acid
etched enamel, there was no significant difference in initial bond strengths
obtained for the Adaptic and unfilled Sevriton resins; (3) with prolonged
water storage, the Adaptic composite resins developed significant loss of
bond strength when compared to the unfilled Sevriton resins and the composite
HL-72 resins; (4) when Adaptic resins and the HL-72 resin specimens
were compared, there was no significant difference in initial bond strengths
but the HL-72 specimens were less affected by storage time.
Ca45 was used to assess the marginal seal of Adaptic, HL-72, and Sevriton
in acid etched and non-etched Class V restorations.
One-half of the specimens were thermal cycled 2500 times and
stored in water for one week. Control specimens were tested at the
end of one week without the thermal cycle.
On the basis of these results, it was concluded that acid etching
enhances the marginal seal of both composite and unfilled resins. Both
composite and unfilled resins experienced increased marginal leakage
when the acid etch preparations were thermal cycled, but there were no
observable difference in the marginal seal of unfilled resins and composite
resins when placed in acid etched restorations.
| Identifer | oai:union.ndltd.org:IUPUI/oai:scholarworks.iupui.edu:1805/4347 |
| Date | January 1973 |
| Creators | Aubuchon, Robert W. (Robert Wayne), 1946- |
| Contributors | Starkey, Paul E., Swartz, Marjorie L., Koerber, Leonard G., Barton, Paul, Roche, James R., 1924- |
| Source Sets | Indiana University-Purdue University Indianapolis |
| Language | en_US |
| Detected Language | English |
| Type | Thesis |
Page generated in 0.2221 seconds