EFFECT OF AIR-BORNE PARTICLE ABRASION/SINTERING SEQUENCE ON THE FLEXURAL STRENGTH OF ZIRCONIA. | ||||
| Alexandria Dental Journal | ||||
| Article 7, Volume 46, Issue 2, August 2021, Page 121-126 PDF (1 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/adjalexu.2020.24145.1048 | ||||
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| Authors | ||||
amr alaa el-din el-kashlan  1; Ihab Adel Hammad2; Naguib El-Fawal3
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| 1Department of Conservative Dentistry,Faculty of Dentistry, Alexandria University, Alexandria, Egypt. | ||||
| 2Conservative Department, Faculty of Dentistry, Alexandria university,Egypt | ||||
| 3Department of Conservative Dentistry, Faculty of Dentistry, Alexandria University, Alexandria, Egypt. | ||||
| Abstract | ||||
| Introduction: zirconia represents a valuable material that combines both color acceptance and ability to withstand high loads. It had been reported that sintering of zirconia followed by air-borne particle abrasion affect its strength. The effect of air-borne particle abrasion/sintering sequence on shear bond strength of resin cements to zirconia was found non-significant; however the effect of sequence on the flexural strength has not been reported. The Ivoclare Vivadent manufacturer recommendation is to sinter the zirconia before subjecting it to air-borne particle abrasion. Aim of the study: to evaluate the effect of air-borne particle abrasion/sintering sequence on the flexural strength of zirconia. Materials and Method: forty bars of dimensions (26 × 6 × 1.5 millimeter) were fabricated from IPS e-max zircad. The specimens was divided into two equal groups (A and B). Group A (AS) were subjected to air-borne particle abrasion followed by sintering. However specimens of group B (SA) were sintered before air-borne particle abrasion. Specimens of each group were subjected to X-Ray Diffraction to show monoclinic-tetragonal phases percentage. Three-point loading was applied to all specimens to measure the flexural strength using a Universal Testing Machine. Results: At statistically significant level p ≤ 0.05. Group SA has showed significantly higher flexural strength compared to group AS. Air-borne particle abraded surface of group SA showed the highest amount of monoclinic phase crystals after X-Ray Diffraction analysis. Conclusion: Air-borne particle abrasion/sintering sequence affects zirconia’ flexural strength. And air-borne particle abrasion surface treatment induces tetragonal to monoclinic phase transformation in fully sintered zirconia. | ||||
| Keywords | ||||
| Sequence; Flexural strength; Pre-sintered; Zirconia; Air-borne particle abrasion | ||||
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