Monteiro Kelli Nunes, Nigro Rafaela Paschoalin, Costa Raul Campos, Macedo Bruno de Oliveira, Favero Stéphanie Soares, de Paula Miranda Ranulfo Benedito, Bonfante Estevam Augusto, Cesar Paulo Francisco
Departamento de Biomateriais e Biologia Oral, Faculdade de Odontologia, Universidade de São Paulo, São Paulo, SP, Brazil.
Departamento de Odontologia Restauradora, Faculdade de Odontologia, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil.
J Mech Behav Biomed Mater. 2025 Jan;161:106809. doi: 10.1016/j.jmbbm.2024.106809. Epub 2024 Nov 7.
The objective was to evaluate the effect of material (four monolithic zirconia) and surface condition [glazed (G) versus polished after simulation of occlusal adjustment (GAP)] on roughness and volumetric wear (VW) of dental zirconia after chewing simulation (CS). Zirconia specimens (ZS) were fabricated with an approximate diameter of 12.0 mm and a thickness of 1.0 mm. The four types of monolithic zirconia utilized were Prettau 4 Anterior (PA), Lava Plus (LP), Cercon hT (hT), and Cercon xT (xT). All specimens were coated with a thin and uniform layer of Prettau Plus glaze. Additionally, half of the ZS underwent a simulation of occlusal adjustment followed by clinical polishing. The sliding wear test was performed using a chewing simulator set at 30 N, 2 Hz, and 500,000 cycles, employing steatite specimens (SS) to simulate opposing dentition. ZS and SS underwent topographic analysis through optical profilometry to assess volumetric wear (VW) and surface roughness. The average roughness values (μm) of the zirconia ranged from 0.38 (PA-G before CS) to 2.55 (PA-GAP after CS), while for the antagonist the values ranged from 1.3 (LP-G before CS) to 2.6 (PA-GAP after CS). The VW values (mm) of the ZS ranged from 0.7 (LP-G) to 2.5 (LP-GAP), while for the antagonist the values ranged from 0.17 (xT-GAP) to 0.33 (LP-G). The CS increased the roughness of all materials tested, regardless of the surface condition. The glazed condition showed lower roughness than the glazed/occlusal adjustment/polishing condition before the CS for three zirconia (PA, LP and xT) and after the CS for all materials. The surface condition did not significantly influence volumetric wear (VW) for three materials (PA, hT, and xT); however, for the Lava Plus (LP) group, the glazed condition resulted in reduced VW. The VW of the SS was unaffected by the material type or surface condition. In summary, zirconia specimens that underwent occlusal adjustment followed by repolishing demonstrated increased surface roughness compared to the glazed ones, while their wear behavior varied depending on the type of zirconia used.
目的是评估材料（四种整体式氧化锆）和表面状况[上釉（G）与模拟咬合调整后抛光（GAP）]对咀嚼模拟（CS）后牙科氧化锆粗糙度和体积磨损（VW）的影响。制作直径约12.0毫米、厚度1.0毫米的氧化锆标本（ZS）。使用的四种整体式氧化锆分别是Prettau 4 Anterior（PA）、Lava Plus（LP）、Cercon hT（hT）和Cercon xT（xT）。所有标本均涂有一层薄而均匀的Prettau Plus釉。此外，一半的ZS进行了咬合调整模拟，然后进行临床抛光。使用设置为30 N、2 Hz和500,000次循环的咀嚼模拟器进行滑动磨损试验，采用滑石标本（SS）模拟对颌牙列。通过光学轮廓仪对ZS和SS进行形貌分析，以评估体积磨损（VW）和表面粗糙度。氧化锆的平均粗糙度值（μm）范围为0.38（CS前的PA-G）至2.55（CS后的PA-GAP），而对于拮抗剂，该值范围为1.3（CS前的LP-G）至2.6（CS后的PA-GAP）。ZS的VW值（mm）范围为0.7（LP-G）至2.5（LP-GAP），而对于拮抗剂，该值范围为0.17（xT-GAP）至0.33（LP-G）。无论表面状况如何，CS都会增加所有测试材料的粗糙度。对于三种氧化锆（PA、LP和xT），上釉状况在CS前显示出比上釉/咬合调整/抛光状况更低的粗糙度，对于所有材料在CS后也是如此。表面状况对三种材料（PA、hT和xT）的体积磨损（VW）没有显著影响；然而，对于Lava Plus（LP）组，上釉状况导致VW降低。SS的VW不受材料类型或表面状况的影响。总之，与上釉的氧化锆标本相比，经过咬合调整后再抛光的氧化锆标本表面粗糙度增加，而它们的磨损行为因所用氧化锆的类型而异。
