Indiana University-Purdue University Indianapolis (IUPUI) / The luting agent is a crucial factor in the outcome of cemented fixed
restorations. A new water-based cement, Ceramir C&B (CM), approved to be marketed
in the US, is composed of calcium aluminate and glass ionomer. CM is a luting agent
indicated for permanent cementation of cast restorations, all-zirconia or all-alumina
crowns, and prefabricated metal and cast dowel and cores. The manufacturer claims
that the cement has demonstrated favorable biocompatibility properties when tested in
vitro and in vivo and has proven to be bioactive.
The objective of this study was to evaluate volumetric dimensional changes and
the amount of Ca2+ released by the new luting agent. Twenty specimens of each
material, namely calcium aluminate glass ionomer, resin-modified glass ionomer, and
two resin luting agents, were fabricated and weighed. The 20 specimens for all materials
were divided into four groups (five samples in each group) based on storage conditions:
silicone oil at 22°C and 37°C and distilled water at 22°C and 37°C. Using the
manufacturers’ instructions for each material, cylindrical specimens were prepared with
dimensions of 7 +0.1 mm in diameter and 2 +0.1 mm in height. A 0.01-mg resolution
balance was used to determine volumetric dimensional change using an Archimedean
equation. Measurements were made 30 minutes after mixing, and at the time intervals of
7 days, 14 days, 21 days, and 30 days, and after total dehydration of the specimen.
Chemical analyses of the solutions were performed using atomic absorption
spectroscopy to determine the Ca+2 ion concentration. Moreover, the pH values were
measured to determine the OH–concentration in the solutions.
The results showed that CM had the most expansion among the tested luting
agents in distilled water at 22°C and 37°C, and significantly increased at higher
temperature. In silicone oil, resin-modified glass ionomer shrank the most and also
shrank more with the high temperature. The result of the ion concentration analysis
indicated that Ca+2 and OHion release increased with increasing time and also
significantly with temperature rise. In conclusion, calcium aluminate-glass ionomer
exhibited the most significant dimensional change when stored in water storage. The
solubility of the tested luting agents should be evaluated in the future because they were
not evaluated in this study. Furthermore, to evaluate the clinical effect of the
dimensional changes, the impact on the gap formation at tooth-crown margins should be
determined in future work.
| Identifer | oai:union.ndltd.org:IUPUI/oai:scholarworks.iupui.edu:1805/6095 |
| Date | January 2014 |
| Creators | Alobaidi, Eassa Ali E. |
| Contributors | Platt, Jeffrey A., 1958-, Haug, Steven, Bottino, Marco C., Levon, John A., Brown, David T. |
| Source Sets | Indiana University-Purdue University Indianapolis |
| Language | en_US |
| Detected Language | English |
| Type | Thesis |
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