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

Authors
 Du-Hyeong Lee  ;  Hang-Nga Mai  ;  Phyu Pwint Thant  ;  Su-Hyung Hong  ;  Jaewon Kim  ;  Seung-Mi Jeong  ;  Keun-Woo Lee 
Citation
 Journal of Advanced Prosthodontics, Vol.11(1) : 41-47, 2019 
Journal Title
JOURNAL OF ADVANCED PROSTHODONTICS
ISSN
 2005-7806 
Issue Date
2019
Keywords
Zirconia ; Dental finishing ; Dental polishing ; Biofilm ; Bacterial adhesion
Abstract
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.
Files in This Item:
T201903932.pdf Download
DOI
10.4047/jap.2019.11.1.41
Appears in Collections:
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
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/173107
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