Magister Scientiae Dentium - MSc(Dent) / Restorative systems classified as polyacid modified composite resins, or
compomers, have appeared on the market. An example of this is Dyract
AP. Dyract AP must be used with the Prime & Bond NT bonding system.
Prime & Bond NT can be applied without any form of prior etching, or it
can be applied after application of Non Rinse Conditioner, or it can be
applied after etching with 36% phosphoric acid.
The purpose of the study was to determine the qualitative microleakage
of Dyract AP and its bonding systems, as well as the influence of saliva
contamination there of. Freshly extracted, non-carious, human
premolars were randomly divided into 8 groups of 18 teeth each.
Apiseetomies coated with Polivar varnish and restored with amalgam
were performed on all teeth. Class V type cavities of 3 mm diameter and
1,5 mm depth were prepared on the CEJ junction on the buccal side of
all teeth. Dyract AP restorations were placed using the bonding
procedures indicated: Group 1: P&B NT (Prime & Bond NT); group 2:
acid (36% phosphoric acid) + P&B NT; group 3: NRC (Non Rinse
Conditioner) + P&B NT; group 4: P&B NT + Saliva; group 5: acid +
Saliva + P&B NT; group 6: acid + P&B NT + Saliva; group 7: NRC +
Saliva + P&B NT; group 8: NRC + P&B NT + Saliva. Restorations were
finished with Sof-Lex discs. After 24 hours storage in distilled water the
teeth were removed and coated with two layers of nail varnish, except
for 1 mm around the restorations. The teeth were then thermocycled in
a 0.5% basic fuchsin solution for 500 complete cycles between 8°C and
50°C, with a dwell time of 15 seconds.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:uwc/oai:etd.uwc.ac.za:11394/9054 |
| Date | January 2002 |
| Creators | Saayman, Charlene Margaret |
| Contributors | Grobler, SR |
| Publisher | Stellenbosch University |
| Source Sets | South African National ETD Portal |
| Detected Language | English |
| Format | application/pdf |
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