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Effects of different surface finishing protocols for zirconia on surface roughness and bacterial biofilm formation

 Du-Hyeong Lee  ;  Hang-Nga Mai  ;  Phyu Pwint Thant  ;  Su-Hyung Hong  ;  Jaewon Kim  ;  Seung-Mi Jeong  ;  Keun-Woo Lee 
 Journal of Advanced Prosthodontics, Vol.11(1) : 41-47, 2019 
Journal Title
Issue Date
Zirconia ; Dental finishing ; Dental polishing ; Biofilm ; Bacterial adhesion
PURPOSE. Surface finishing of a zirconia restoration is essential after clinical adjustment. Herein, we
investigated the effects of a surface finishing protocol for monolithic zirconia on final roughness and bacterial
adherence. MATERIALS AND METHODS. Forty-eight disk-shaped monolithic zirconia specimens were
fabricated and divided into four groups (n = 12) based on initial surface treatment, finishing, and polishing
protocols: diamond bur+polishing bur (DP group), diamond bur+stone grinding bur+polishing bur (DSP group),
no diamond bur+polishing bur (NP group), and no diamond bur+stone grinding bur+polishing bur (NSP group).
Initial and final surface roughness was measured with a profilometer, and shown using scanning electron
microscope. Bacterial adhesion was evaluated by quantifying Streptococcus mutans in the biofilm. Kruskal–
Wallis and Mann-Whitney U tests were used to compare results among groups, and two-way analysis of variance
was used to evaluate the effects of grinding burs on final roughness (α=.05). RESULTS. The DP group had the
highest final Ra value, followed by the DSP, NP, and NSP groups. Use of the stone grinding bur as a coarsefinishing
step significantly decreased final Ra values when a diamond bur was used (P<.001). Omission of the
stone grinding bur increased biofilm formation on specimen surfaces. Combining a stone grinding bur with
silicone polishing burs produced the smallest final biofilm values, regardless of the use of a diamond bur in
initial surface treatment. CONCLUSION. Coarse finishing of monolithic zirconia with a stone grinding bur
significantly decreased final Ra values and bacterial biofilm formation when surfaces had been roughened by a
diamond bur.
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2. College of Dentistry (치과대학) > Dept. of Prosthodontics (보철과학교실) > 1. Journal Papers
Yonsei Authors
Lee, Keun Woo(이근우) ORCID logo https://orcid.org/0000-0002-3153-190X
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