Abstract
Objective
The clinical performance of polymethylmethacrylate (PMMA)-based fixed dental prostheses (FDP) was evaluated in the indication of long-term temporaries.
Materials and methods
In the current indication of the applied machinable PMMA-based material (Vita CAD-Temp), i.e. temporary crowns and FDPs, 27 patients with compromised dentitions (uncertain dental prognosis or postponement of a removable treatment option) were recruited and 45 FDPs (3 or 4 units, 37 terminal-retained, 8 cantilevered) were inserted. Frameworks were computer-aided design (CAD)/computer-aided manufacturing (CAM)-manufactured after conventional impression taking and labside scanning of stone master casts. A resin-modified hybrid cement material (RelyX Unicem) was used for luting in a conventional protocol. Clinical follow-up was performed biannually.
Results
Over an observation time from 2 to 26 months (median 13 months), 11 complications were found in 9 out of 45 PMMA restorations: 4 losses of retention, 5 complete fractures; two of these subsequent to a trepanation for endodontic treatment. Thereby, 3 out of 8 cantilevered FDPs had to be removed within 8 months. Thus, the statistical evaluation included FDPs with abutment at end, only. These standard design FDPs (n = 37) showed a 90.4 % survival rate with a complication-free rate of 88.3 % estimated for an observation time of 16 months.
Conclusion
Cantilevered FDPs and reconstructions on abutment teeth with markedly reduced biological prognosis or endodontic intervention yielded a high-failure rate. Terminal-retained FDPs performed clinically well in cases without compromised abutment teeth.
Clinical relevance
PMMA-based material might be used successfully for long-term temporization with 3- to 4-unit FDPs in a standard design over at least one year.
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Acknowledgments
This clinical trial was approved by the Ethics Committee of Tuebingen University (30/2009MPG2) and is listed at the German Clinical Trials Register (DRKS00000644). The authors thank the following dental technicians of Tuebingen University Hospital’s Dental Lab: MDT Ekkehard Kroewerath, DT Volker Scheer and DT Karina Wuensch. The study was partially financed by Vita Zahnfabrik (Bad Säckingen, Germany) and by the Medical Faculty of Eberhard Karls University of Tuebingen.
Conflict of interest
The authors declare no personal conflict of interest, besides being involved in this clinical trial.
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Huettig, F., Prutscher, A., Goldammer, C. et al. First clinical experiences with CAD/CAM-fabricated PMMA-based fixed dental prostheses as long-term temporaries. Clin Oral Invest 20, 161–168 (2016). https://doi.org/10.1007/s00784-015-1475-7
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DOI: https://doi.org/10.1007/s00784-015-1475-7