Ex Vivo Assessment of Natural Teeth Wear against Zirconia and Novel Glass-Fiber-Reinforced Composite Crowns in Primary Teeth by a Three-Dimensional Assessment Method.

Abhinav Talekar,Gayatri Chaudhari,Sneha Kothare,Yusuf Chunawala,Amol Patil,Sreekanth Kumar Mallineni,Shikha Choubey,Prasad Musale,Li Wu Zheng

doi:10.1155/2021/9670982

Abhinav Talekar, Gayatri Chaudhari + Show 7 more

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https://doi.org/10.1155/2021/9670982

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Abstract

Objectives The main purpose of the study was to assess the material wear, antagonistic natural primary teeth wear, and microhardness of zirconia (ZR), a recently launched novel glass-fiber-reinforced composite crown (GFRC). The research question was, are these aesthetic crowns resulting in antagonistic natural primary tooth wear and the crown material itself? Methods Forty-five primary canines were divided into three groups (15 per group) and mounted against Zr (Group A), GFRC (Group B), and natural teeth as control (Group C) in the wear test machine. All samples were assessed for surface wear with pre- and post-3-dimensional scanning. In addition, microhardness was assessed for all three groups. Results The mean microhardness value for the Zr disc was 1157 ± 7 HV; for the GFRC disc, it was 29.35 ± 2 HV; while with natural teeth, it was 105 ± 4 HV. There was a statistically significant difference in teeth wear in the prescan and postscan in the natural tooth (p < 0.05) group, highly significant difference (p < 0.001) in the ZR group, and no significant difference in the GFRC group. Conclusion There is more significant wear loss of glass-fiber-reinforced composite discs as compared to zirconia. In addition, the wear of the antagonistic tooth with zirconia and natural teeth is more remarkable than with GFRC. There is a vast difference of microhardness between natural teeth and zirconia (almost 10 times higher) which suggests further scope of study. Clinical Relevance. Pediatric dentistry deals with the transition of dentition from primary to permanent through mixed dentition. Selection of restorative material needs to be done cautiously when we are dealing with primary teeth and young permanent teeth as antagonistic teeth. Wear of the crown material itself and opposing natural teeth are essential factors that should be considered in selecting crowns in clinical practice. The present study results can be extrapolated to clinical practice, and the practitioner can consider various factors in selecting full-coverage crowns for primary teeth. The vast difference in aesthetic crowns and natural teeth microhardness indicates a further need for research. Additionally, there is no literature published for the recently launched GFRCs.

Highlights

In primary dentition, full-coverage restoration is indicated for extensive or multisurface carious lesions
Preformed stainless steel crowns (SSCs) have been used for this purpose since 1950 and are still considered the gold standard [1, 2]. Despite their known advantages and proven success, SSCs do not meet the aesthetic demands of recent times. ese aesthetic demands led to various innovations such as modifications of SSC such as preveneered, composite facing, International Journal of Dentistry shell crowns, composite crowns, polycarboxylate crowns, celluloid crowns, and recently, zirconia crowns (ZR) [3,4,5,6]
Less aggressive tooth reduction and reduced time requirements compared to ZR crowns, the ability to modify crowns, aesthetics similar to ZR crowns, and greater cost-effectiveness are some of the advantages of these crowns over ZR crowns as enlisted by the manufacturer [8]

Summary

Introduction

Full-coverage restoration is indicated for extensive or multisurface carious lesions. Preformed stainless steel crowns (SSCs) have been used for this purpose since 1950 and are still considered the gold standard [1, 2] Despite their known advantages and proven success, SSCs do not meet the aesthetic demands of recent times. Ese crowns are thicker than SSCs, requiring substantial tooth preparation, which may cause pulp exposure, may require passive seating when cementing, and cannot be modified to conform to the tooth [3, 6] To overcome these drawbacks of ZR crowns, uphold the properties of SSCs and meet aesthetic demands, a new type of glass-fiber-reinforced composite (GFRC) crown has been recently introduced. E masticatory force was established using previous studies that compared the wear of primary teeth against different dental materials [17, 19, 20]. A thermodynamic condition similar to the natural oral environment was reproduced using a computer-controlled hot/cold water circulation system [20, 21]

Materials and Methods

Discussion

Conclusion