Indiana University-Purdue University Indianapolis (IUPUI) / An investigation was conducted into the effect of acid etching
of the enamel and the use of pins on the retention of direct filling
resins when used for restoration of fractured incisor teeth. The
retention secured by these techniques as related to the cavity design
also was studied.
Four different cavity preparations were used. The retention of
the resin in all four was compared when there was no pretreatment of
the enamel, when the enamel was etched by 50 per cent phosphoric acid,
and when pins were used for retention. Retention was assessed on the
basis of resistance of the restoration to displacement by a lingual
force. No significant difference was observed in retention as related
to cavity design in the control specimens. In all four cavity
preparations, acid etching of the enamel and the use of two retentive
pins increased the resistance of the restorations to displacement.
(However; when only one "L" shaped retentive pin was employed in
Conjunction with a flat incisal preparation the force required to
accomplish displacement was no greater than for controls.) The acid
etch technique when employed with a cavity preparation that extended
1.7 mm. or more onto the lingual surface of the enamel generally
offered a higher resistance to lingual force than double pin retained
restorations. There was no significant difference between the
resistance offered by a circumferential preparation when the resin
was retained by either acid etching or by two pins.
In the acid etch technique the enamel surface area and its
distribution are important factors in retention.
| Identifer | oai:union.ndltd.org:IUPUI/oai:scholarworks.iupui.edu:1805/3551 |
| Date | January 1971 |
| Creators | Ayers, Alvin James, Jr., 1941- |
| Contributors | Gilmore, H. William (Homer William), Norman, Richard Daviess, 1927-, Garner, La Forrest Dean, 1933- |
| Source Sets | Indiana University-Purdue University Indianapolis |
| Language | en_US |
| Detected Language | English |
| Type | Thesis |
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