Statement of Problem. Resin-based cements have become increasingly more popular for the cementation of prefabricated endodontic dowels due to their superior retention. The manufacturer of Panavia F 2.0 suggests that the product be stored under refrigerated conditions while not in use, however, there is no literature to support such a rationale. It is possible that these storage/use temperature cycling events may have a deleterious effect on the retention of prefabricated endodontic dowels. Purpose. The purpose of this in-vitro study was to investigate the retention of Panavia F 2.0 used to lute prefabricated endodontic dowels after the Panavia F 2.0 system has been kept under different storage conditions. Material and Methods. Sixty-four extracted human central incisors were selected to undergo root canal therapy and dowel retention testing. Four separate Panavia F 2.0 cement systems were placed under 4 different storage conditions for a period of 6 months, until retention testing was initiated. In the first group, the Panavia F 2.0 was stored under the manufacturer's suggested refrigerated conditions, at a constant temperature of 40°F. In the second group, the Panavia F 2.0 was stored under a constant 90°F temperature. In the third group, the Panavia F 2.0 was stored under room temperature conditions of 70°F. The fourth group attempted to mimic clinical usage conditions with the Panavia F 2.0 being cycled from refrigeration at 40°F for 22 hours/day to 2 hours/day of room temperature at 70°F 5 days per week for the duration of the 6-month storage condition period. Results. Stress values were analyzed using 1-way ANOVA. A Tukey's HSD multiple comparison analysis of the dowel retention strengths indicated that the group stored at 90°F resulted in the lowest retention. This group was significantly lower than all other groups' retention strength (p Conclusions. Within the limitations of this study, the storage of Panavia F 2.0 at either room temperature or cycling between refrigeration and room temperature yields similar dowel retention values. However, the storage of Panavia F 2.0 at temperatures of 90°F for prolonged periods causes poor dowel retention. Clinical Implications The results of this study do not support the necessity of storing Panavia F 2.0 under refrigerated conditions between clinical uses, if used within six months. However, the storage of the Panavia F 2.0 cementation system at temperatures of 90°F for prolonged periods will affect dowel retention and is therefore not advisable.
| Identifer | oai:union.ndltd.org:vcu.edu/oai:scholarscompass.vcu.edu:etd_retro-1077 |
| Date | 01 January 2005 |
| Creators | Schleider, David Mark |
| Publisher | VCU Scholars Compass |
| Source Sets | Virginia Commonwealth University |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | Retrospective ETD Collection |
| Rights | © The Author |
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