Hogendoorn, Jacobien (2022) De lithiumdisilicaat enkelzijdige etsbrug ter vervanging van een premolaar Een in vitro fractuuranalyse. thesis, Dentistry.
Full text available on request.Abstract
OBJECTIVES: Cantilevered lithium-disilicate fixed dentures are contraindicated by the manufacturers. Solely the three-unit fixed partial bridge, with the second premolar as most posterior abutment, is indicated in a multi-unit fixed partial denture (FPD) of lithium-disilicate. Recent, promising results of the cantilevered anterior FPD’s were published, with higher survival rates of the cantilevered than the three-unit anterior FPD’s. These results could be promising for the cantilevered FPD’s posterior. To date little is known about the posterior lithium-disilicate FPD’s with cantilever. The purpose of this in vitro study was to evaluate the influence of immediate dentin sealing (IDS) and preparation-type on the fracture strength of CAD FPD’s with a mesial cantilever substituting a premolar. METHOD AND MATERIALS: A total of 50 whole ceramic FPD’s with a mesial cantilever were made and cemented on extracted molars. The FPD’s with a mesial cantilever were categorized into 5 groups based on preparation type and utilization of IDS; inlay retained FPD cemented without IDS, onlay retained FPD cemented without IDS, inlay retained FPD cemented with IDS, onlay retained FPD cemented with IDS, and direct retained to enamel. The FDP’s were CAD/CAM manufactured and cemented adhesively. The specimen were artificially aged for 5 years by thermocycling and chewing simulation. RESULTS: The mean fracture strength per group were: 154,92 N (inlay without IDS), 382,13 N (onlay without IDS), 260,42 N (inlay with IDS), 378,33 N (onlay with IDS) and 505,50 N (enamel preparation). Significant difference was found between the inlay without IDS and enamel preparation groups (p = ,04). Application of IDS has a significantly higher fracture strength of 248,38 N than no IDS with 112,90 N (p = ,03). Onlay preparation has a significantly higher fracture strength of 246,68 N than inlay preparation with 124,60 N (p = ,03). Enamel preparation has a significantly higher fracture strength than the no IDS groups (fracture strength difference of 230,95 N, p = ,02) and the inlay groups (fracture strength difference of 229,25 N, p = ,02). CONCLUSIONS: The lithium-disilicate FPD’s with a mesial cantilever replacing a premolar with the onlay preparation and when IDS is applied have a greater fracture strength than the inlay preparation and in the absence of IDS. The enamel preparation has also a higher fracture strength than the inlay preparation and in the absence of IDS.
| Item Type: | Thesis (UNSPECIFIED) |
|---|---|
| Supervisor name: | van den Breemer, dr. C.R.G. and Gresnigt, dr. M.M.M. |
| Faculty: | Medical Sciences |
| Date Deposited: | 29 Mar 2023 10:59 |
| Last Modified: | 29 Mar 2023 10:59 |
| URI: | https://umcg.studenttheses.ub.rug.nl/id/eprint/3463 |
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