Comparing The Accuracy of CBCT Imaging in Diagnosis of Recurrent Caries Under Porcelain-Fused to Metal Crowns Versus Zirconia Crowns: An in vitro Study

Document Type : Original Article

Authors

1 Assistant Professor, Radiology Department, Faculty of Dentistry, Kafr Al Sheikh University, Kafr Al Sheikh, Egypt.

2 Assistant Professor, Prosthodontic Department, Faculty of Dentistry, Kafr Al Sheikh University, Kafr Al Sheikh, Egypt

Abstract

State of problem. The diagnosis of recurrent caries beneath a fixed dental prosthesis using dental radiographs is challenging without removal of the prosthesis. The material of the fixed dental prosthesis is considered one of the factors affecting the accuracy of the radiograph. Purpose. The purpose of this study is to compare the accuracy of using cone-beam computed tomography images of recurrent dental caries beneath crowns fabricated from porcelain fused to metal and zirconia. Materials and methods. Ten carious human molars were collected for this research. The same selected teeth were used in 3 groups (n=10). Group CO (n=10) (control group) (teeth imaged with CBCT without any crown), Group ZR (n=10) (teeth imaged with teeth covered with zirconia crown), and Group MC (n=10) (teeth imaged with teeth covered with porcelain fused to metal crown). The CBCT machine was used for imaging the specimens. With the use of 3D OnDemand software, the horizontal surface area of the carious lesion was measured at the same level (near the tooth's CEJ) in each of the three groups. Results. The mean surface area measurements of caries in groups ZR (7.74 mm²) and MC (6.47 mm²) were statistically significantly lower than those of group CO (9.98 mm²) (P<.05). While there was no significant difference between surface area measurements of caries in both groups, ZR and MC. Conclusion. Using cone-beam computed tomography images can detect recurrent caries beneath both zirconia and porcelain-fused-to-metal crowns margins, but the accuracy of measurements was affected significantly by crowns.

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Egyptian Dental Journal
Volume 71, Issue 3 - Serial Number 4
Fixed Prosthodontics, Removable Prosthodontics and Dental Materials
July 2025
Pages 2403-2410

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