Abstract：
:The carcinogenic potential of asbestos has led to the development of non-asbestos materials for use as casting ring liners. Cellulose paper are replacing asbestos paper. The brass die and crown were made to produce full crowns. The standardized wax pattern was replicated twenty-nine times. Two grooves were marked on the die and wax patterns. The marginal gaps between wax pattern and die shoulder were measured. Then, the wax specimens were divided into three groups. The dry ring liner and the water-saturated ring liner were used, in the third group, any liner was used. The castings were fabricated and were fitted on the die. Measurements were made of the distance separating the gingival margin of the castings from the shoulder on the die. Measurement points (X and Y) were the same points used for wax pattern measurement. The difference between wax pattern and casting was found to be statistically significant in all the groups (p = 0.0051). There was no statistically significant difference between groups on the comparative fit of the castings. The mean marginal space in the water-saturated liner group was 0.51 +/- 0.12 mm (X), 0.51 +/- 0.11 mm (Y), and in the dry liner group, the mean marginal space was 0.47 +/- 0.09 mm (X), 0.49 +/- 0.08 mm (Y). In the unlined group, they were 0.52 +/- 0.18 mm (X), 0.55 +/- 0.17 mm (Y). Use of dry ring lining material resulted in smaller marginal spaces between castings and the die than use of water-saturated cellulose ring lining material. The results demonstrated that the use of dry liners may improve the fit of castings to dies.
journal_name
J Biomater Appljournal_title
Journal of biomaterials applicationsauthors
Keyf F,Erman Gdoi
10.1177/088532820001400406subject
Has Abstractpub_date
2000-04-01 00:00:00pages
399-408issue
4eissn
0885-3282issn
1530-8022journal_volume
14pub_type
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