Nijssen, E.F.M. (Eefke) (2016) Succespercentage van Zirconia etsbruggen na 1 jaar en 2,5 jaar. thesis, Dentistry.
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Abstract
The technical possibilities in prosthetic dentistry are developing strongly. There are increasing possibilities for the replacement of missing teeth. The resin-bonded fixed dental prosthesis (FDP) is a valid treatment option. A fairly new material that can be used to create FDPs is Zirconiumdioxide, a ceramic containing Yttrium Tetragonal Zirconia Polycrystals (Y-TZP). Due to its physical and optical properties plus biocompatibility, Zirconia is suitable for ceramic crowns and partial prosthesis. The major limitation of Zirconia is getting a predictable and reliable adherence to this material. The purpose of this study is to evaluate the possibility of using Zirconia for resin-bonded fixed dental prosthesis, considering its success rate with regard to bonding. Materials and method This study is designed as a retrospective cohort study. The cohort consists of 118 patients, who received a 3-unit resin-bonded fixed dental prosthesis. The FDPs are criticized using registered information in a database about their bonding by determining the survival rate after 2,5 years in a general practice. A standard procedure for bonding was executed by the same practitioner. The procedure consisted of sandblasting with aluminiumoxide, then applying Z-prime Plus (Bisco) and thereafter using Rely X (3M ESPE) for cementation. There are several variables included to criticize their influence on bonding: 1) the location from the FDP intraoral, 2) the location within the jaw and 3) the differences in preparation design. The survival rate was determined by a Kaplan-Meier survival analysis. The influence of the listed variables is tested by a Cox-regression analysis. Results The Kaplan-Meier survival rate at 12 months was 96,8% (SE 0,018). The average time of ‘survival’ (the time before debonding) was 58,0 months in this study. The Cox-regression analysis suggests that the risk of debonding in the mandibula is 5 times more likely than in the maxilla. There were no significant differences in risk of debonding depending on location within the jaw. Also there were no significant differences between the chances of debonding depending on different preparation designs. Conclusion The survival rate after one year of resin-bonded fixed dental prosthesis made of Zirconia proofs to equal that of metal FDPs. However the survival rate after 2,5 year of Zirconia FDPs is lower than of metal FDPs. The risk of debonding for Zirconia FDPs in the lower jaw is higher than in the upper jaw. At the same time the studied data do not indicate a difference in debonding risk for FDPs placed in the posterior region compared to FDPs placed in anterior region. The best choice for a preparation design is determined by facts and circumstances. In case of an appropriately selected preparation design there is no significant difference in debonding risk between prepared and unprepared pillars. Supplementary research should in first instance focus on the long term time of survival, the influence of preparation designs, the impact of applied bonding procedures and the chemical composition of products. Only then will it be possible to draw a final conclusion about the use of Zirconia, in view of bonding to this material, for FDPs.
| Item Type: | Thesis (Thesis) |
|---|---|
| Supervisor name: | Begeleider: and Pelt, Dr. A.W.J. van Restauratief tandarts en EPA Prosthod |
| Faculty: | Medical Sciences |
| Date Deposited: | 25 Jun 2020 10:56 |
| Last Modified: | 25 Jun 2020 10:56 |
| URI: | https://umcg.studenttheses.ub.rug.nl/id/eprint/1644 |
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