A comparative evaluation of fracture load of monolithic and bilayered zirconia crowns with and without a cervical collar: an in vitro study

Authors

  • Mainak Kanti Saha
  • Surbhi Bansal
  • Vandana Pathak
  • Shivani Bhardwaj
  • Astha Chauhan
  • Amit Singh Nirwan

DOI:

https://doi.org/10.15386/mpr-985

Keywords:

bilayered, flexural strength, monolithic, zirconia

Abstract

Introduction. The use of zirconia based all-ceramic restorations are preferred nowadays owing to superior biologic and esthetic properties. However, these restorations have also reported higher incidences of fracture and chipping. The clinical success may be enhanced by optimizing the core design, through the introduction of monolithic zirconia, or the layered crowns can be strengthened by adding the cervical collar to them.

Objective. This study was performed with the objective to compare and evaluate the fracture load of monolithic and bilayered zirconia crowns with and without a cervical collar.

Methods. A prospective observational study was carried out to compare 45 fabricated zirconia crowns of three different designs on a customized metal mould. The samples were oriented on the metal mould and subjected to confocal microscope for the evaluation of marginal integrity followed by cementing the crown on the metal mould and subjecting it to the universal testing machine for the analysis for the flexural strength. Data were analyzed using one way Anova and t- test for inter and intra groups. The significance level was set at P ≤ 0.05.

Results. The monolith zirconia crowns and layered zirconia crowns with cervical collar reported more flexural strength .

Conclusion. The amount of force required to fracture the zirconia crowns was higher in the case of monolith zirconia crown and layered zirconia crown with cervical collar as compared to the layered zirconia crown without cervical collar.

Author Biographies

Surbhi Bansal, Rau college of Dental Sciences, Indore

Department of prosthodontics

Vandana Pathak, Rau college of Denta sciences, Indore

Department of prosthodontics

Astha Chauhan, Index Institute of Dental Sciences, Indore

Department of Public Health Dentistry

Amit Singh Nirwan, Rau college of Dental sciences, Indore

Department of oral & maxillofacial surgery

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Published

2019-04-24

How to Cite

1.
Saha MK, Bansal S, Pathak V, Bhardwaj S, Chauhan A, Nirwan AS. A comparative evaluation of fracture load of monolithic and bilayered zirconia crowns with and without a cervical collar: an in vitro study. Med Pharm Rep [Internet]. 2019 Apr. 24 [cited 2025 Oct. 5];92(2):172-7. Available from: https://medpharmareports.com/index.php/mpr/article/view/985

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Section

Original Research