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The effect of adjustment and finishing procedure on roughness, strength, and phase transformation of monolithic zirconia

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Abstract

Objective

To evaluate the effect of adjustment and finishing procedures and thermal aging of monolithic zirconia on the surface roughness, phase transformation, and flexural strength.

Material and methods

One hundred disk-shaped monolithic zirconia specimens were randomly divided into 5 groups: control, received only glazing; group Gr, was grinded; group GrP, was grinded and polished; group GrG, was grinded and re-glazed; group GrPG, was re-glazed after grinding and polishing. Half of the each group were stored in distilled water for 24 h and the remaining were thermocycled for 5000 cycles. Topographic evaluations were done with profilometer and scanning electron microscope. Phase changes were assessed through X-ray diffractometer. The biaxial flexural strength test was calculated by universal test machine. Statistical analysis was performed by using two-way ANOVA and Tukey multiple comparison test (p < 0.05).

Results

Group Gr showed statistically higher surface roughness and flexural strength values than the other groups (p < 0.001). However, no significant differences were observed between finishing groups (p >0.05). Phase transformation was occurred in all groups but the differences were not statically significant (p >0.05). Artificial aging had no effect on surface roughness, flexural strength, and phase transformation (p >0.05).

Conclusion

Surface roughness significantly increased after grinding, but finishing procedure approximated it to the control group. Glazing after grinding decreased the flexural strength, but polishing did not. Zirconia polishing system may be an alternative to re-glazing for monolithic zirconia.

Clinical relevance

Polishing is one of the most effective finishing procedures that can improve the physical properties of the material without damaging its mechanical properties.

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Funding

This study was supported by the Research Projects Fund of Recep Tayyip Erdogan University (Grant no: TDH-2018–933).

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Authors and Affiliations

  1. Private Practice, Istanbul, Turkey

    Isıl Ozturk

  2. Department of Prosthodontics, Faculty of Dentistry, Recep Tayyip Erdogan University, Islampasa, Kurtuluş St. No: 28, 53020, Rize, Turkey

    Ipek Caglar & Zeynep Yesil Duymus

  3. Department of Prosthodontics, Faculty of Dentistry, Ataturk University, Atatürk St, 25240, Erzurum, Turkey

    Zeynep Yesil Duymus

Authors
  1. Isıl Ozturk
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  2. Ipek Caglar
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  3. Zeynep Yesil Duymus
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Correspondence to Ipek Caglar.

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Isıl Ozturk declares that she has no conflict of interest. Ipek Caglar declares that she has no conflict of interest. Zeynep Yesil Duymus declares that she has no conflict of interest.

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Ozturk, I., Caglar, I. & Duymus, Z.Y. The effect of adjustment and finishing procedure on roughness, strength, and phase transformation of monolithic zirconia. Clin Oral Invest 26, 4761–4768 (2022). https://doi.org/10.1007/s00784-022-04440-x

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  • DOI: https://doi.org/10.1007/s00784-022-04440-x

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