Abstract
Purpose
Preformed metal crown (PMC) were considered as the best method of restoring primary molars. In recent years, dentistry has seen the emergence of esthetic full-coverage restorative alternatives that gave better results but their ability to manipulate the size, shape, and fit is very limited. The milled zirconia crown is a new alternative for the restoration of deciduous teeth, but the mechanical properties of these restorations need to be tested.
Aim
To assess and compare the force required to fracture on two posterior pedodontics crowns: a prefabricated Zirconia crowns (PZC) (NuSmile Zr Zirconia®) and a new custom-made zirconia crown (also called Zirkid©) on a freshly extracted deciduous molars.
Methods
Thirty freshly extracted deciduous molars were selected and were randomized into two groups: (1) molars prepared to receive the PZC and (2) molars prepared to receive the milled zirconia crowns. All pediatric crowns were cemented with glass ionomer and the samples were placed in the thermocycling machine for thermal aging of 1000 cycles. Mechanical compression forces were applied using the Universal Testing Machine until fracture of the crowns. The force required to fracture were evaluated. Since variable was normally distributed with Kolmogorov–Smirnov test, Student t test was used for statistical comparison.
Results
This study showed that the mean fracture force was significantly elevated with zirconia crowns made with Zirkid© (2888.6 ± 1060.2 N) compared to NuSmile Zr crowns (646.5 ± 223.9 N) (p value < 0.001).
Conclusion
Considering the limitations of the present in vitro study, further in vitro and in vivo studies are required to support the use of Zirkid© in primary molar teeth restorations and to assess others mechanical properties.
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Abbreviations
- PZC:
-
Prefabricated zirconia crowns
- PMC:
-
Preformed metal crown
- IRM:
-
Intermediate restorative material
- UTM:
-
Universal testing machine
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Acknowledgements
This work was carried out at the Unit of Biomaterials at the CranioFacial Research Laboratory at the Faculty of Dental Medicine at Saint Joseph University of Beirut. We wish to extend our special thanks to Professor Maha Daou Eggerickx and to Professor Pascale Habre Hallage for their expertise and assistance throughout the study. The prosthetic assistance provided by Mr. Alain Barakat and the staff of the Dental Design Studio (s.a.r.l.), Dekweneh was greatly appreciated.
Funding
This work was supported by the Medical Research Council of Saint Joseph University of Beirut (Grant number: FMD181).
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JEEH, NFM contributed with conception and design. NEO contributed with analysis and interpretation of data. JEEH contributed with acquisition of data. JEEH, NEO, NFM involved in drafting the manuscript. NEO, NFM revised critically the manuscript for important intellectual content. All authors read and approved the final manuscript.
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The protocol of the study was approved by the Committee of Ethics at Saint Joseph University of Beirut (USJ-2018-85).
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Elian El Hayek, J., El Osta, N. & Farhat Mchayleh, N. Fracture strength of preformed zirconia crown and new custom-made zirconia crown for the restoration of deciduous molars: in vitro study. Eur Arch Paediatr Dent 23, 333–339 (2022). https://doi.org/10.1007/s40368-022-00691-0
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DOI: https://doi.org/10.1007/s40368-022-00691-0