Moon Wonjoon, Park Joo Hyang, Lee Han-Ah, Lim Bum-Soon, Chung Shin Hye
Department of Dental Biomaterials Science, Dental Research Institute, School of Dentistry, Seoul National University, Seoul 03080, Korea.
Materials (Basel). 2021 Mar 8;14(5):1286. doi: 10.3390/ma14051286.
The purpose of this study was to observe whether the repetitive firing of dental zirconia caused changes in surface characteristics, viability, and optical properties of zirconia. Dental zirconia blocks were sintered and randomly distributed into seven experimental groups: F0-F6. Except for F0, which only went through sintering, the additive firing was performed in order for F1-F6. Surface roughness, contact angle, viability by fluorescence, and translucency parameter were measured. They were all highest after sintering (F0) and decreased after additive firings (F1-F6). The additive firing of zirconia after sintering decreased surface roughness, contact angle, viability, and translucency. The number of firings after the first firing was not found to be critical in surface characteristics, viability, and optical property. Changes in surface characteristics might have led to a decrease in viability, while the change of translucency was not clinically significant. This implies that additive firing may prevent secondary caries under zirconia restorations, not compromising esthetic appearance.
本研究的目的是观察牙科氧化锆的重复焙烧是否会导致氧化锆表面特性、生物活性和光学性能的变化。将牙科氧化锆块烧结后随机分为七个实验组：F0 - F6。除仅经过烧结的F0组外，对F1 - F6组进行额外焙烧。测量表面粗糙度、接触角、荧光法测定的生物活性和半透明参数。这些参数在烧结后（F0）均最高，在额外焙烧后（F1 - F6）降低。烧结后氧化锆的额外焙烧降低了表面粗糙度、接触角、生物活性和半透明性。首次焙烧后的焙烧次数在表面特性、生物活性和光学性能方面并非关键因素。表面特性的变化可能导致生物活性降低，而半透明性的变化在临床上并不显著。这意味着额外焙烧可能预防氧化锆修复体下的继发龋，且不影响美观。
