The Retentive Strength of Cemented Zirconium Oxide Crowns after Dentin Pretreatment with Desensitizing Paste Containing 8% Arginine and Calcium Carbonate.

Raphael Pilo,Shifra Levartovsky,Joseph Nissan,Noga Harel

doi:10.3390/ijms17040426

Abstract

The effect of dentin pretreatment with Desensitizing Paste containing 8% arginine and calcium carbonate on the retention of zirconium oxide (Y-TZP) crowns was tested. Forty molar teeth were mounted and prepared using a standardized protocol. Y-TZP crowns were produced using computer-aided design and computer-aided manufacturing (CAD-CAM) technology. The 40 prepared teeth were either pretreated with Desensitizing Paste or not pretreated. After two weeks, each group was subdivided into two groups, cemented with either Resin Modified Glass Ionomer Cement (RMGIC) or Self Adhesive Resin Cement (SARC)). Prior to cementation, the surface areas of the prepared teeth were measured. After aging, the cemented crown-tooth assemblies were tested for retentive strength using a universal testing machine. The debonded surfaces of the teeth and crowns were examined microscopically at 10× magnification. Pretreating the dentin surfaces with Desensitizing Paste prior to cementation did not affect the retention of the Y-TZP crowns. The retentive values for RMGIC (3.04 ± 0.77 MPa) were significantly higher than those for SARC (2.28 ± 0.58 MPa). The predominant failure modes for the RMGIC and SARC were adhesive cement-dentin and adhesive cement-crown, respectively. An 8.0% arginine and calcium carbonate in-office desensitizing paste can be safely used to reduce post-cementation sensitivity without reducing the retentive strength of Y-TZP crowns.

Highlights

Post-operative sensitivity often occurs after the cementation of fixed partial dentures (FPDs) [1]
Several agents have been used prior to cementation to decrease post-cementation sensitivity. These agents include dentin primers, such as an aqueous solution of 35% hydroxyethyl methacrylate (HEMA), an aqueous mixture of 35% HEMA and 5% glutaraldehyde, potassium nitrate, 5% N-methacryloyl-5-aminosalicylic acid diluted in ethanol, and an aqueous solution of 35% glyceryl methacrylate [5,6]
Pretreating the dentin surfaces with Colgate Sensitive Pro-Relief Desensitizing Paste prior to cementation with either resin-modified glass ionomer cement (RMGIC) or SARC did not affect the retentive strength of the Lava Y-TZP crown copings (p = 0.573)

Summary

Introduction

Post-operative sensitivity often occurs after the cementation of fixed partial dentures (FPDs) [1]. The application of desensitizers to the prepared abutment teeth may be very effective in relieving post-cementation sensitivity for FPDs and is beneficial in terms of patient comfort [4]. Several agents have been used prior to cementation to decrease post-cementation sensitivity. These agents include dentin primers, such as an aqueous solution of 35% hydroxyethyl methacrylate (HEMA), an aqueous mixture of 35% HEMA and 5% glutaraldehyde, potassium nitrate, 5% N-methacryloyl-5-aminosalicylic acid diluted in ethanol, and an aqueous solution of 35% glyceryl methacrylate [5,6]. Because retention values likely depend on the combined effects of the desensitizing agent, cement and crown type, evidence-based studies are needed to determine the benefits of specific combinations

Results

Discussion

Conclusion