Carneiro Pereira Ana Larisse, Dos Santos Silva João Pedro, Grangeiro Manassés Tercio Vieira, de Medeiros Annie Karoline Bezerra, Bottino Marcos Antonio, Barão Valentim A R, da Fonte Porto Carreiro Adriana
Department of Dentistry, Federal University of Rio Grande do Norte (UFRN), Natal, Rio Grande do Norte, Brazil.
Department of Prosthodontics and Periodontology, Piracicaba Dental School, Universidade Estadual de Campinas (UNICAMP), Piracicaba, São Paulo, Brazil.
J Prosthodont. 2024 Dec 16. doi: 10.1111/jopr.14001.
To evaluate the impact of glazing denture base resins (heat-polymerized and 3D-printed) on surface, mechanical, and microbiological properties.
Discs (10 × 3 mm) and bars (64 × 10 × 3.3 ± 0.2 mm) were manufactured using heat-polymerized denture base resin (CT) and 3D-printed denture base resin (Yller [YL], Prizma [PZ] and PrintaX [PX]). These were divided into two groups: unglazed and glazed. Surface roughness (Ra), wettability (contact angle), brightness (GU), and topography (via scanning electron microscopy) were assessed, along with microbiological analysis of dual-species biofilms (Streptococcus mitis and Candida albicans) and Knoop microhardness on discs (n = 10). Flexural strength testing was conducted separately on bars (n = 20). Half of the specimens subjected to surface and mechanical characterizations were thermocycled (10,000 cycles). Mann-Whitney test (p < 0.05) and simple and multiple linear regression analysis (p < 0.20) were employed to evaluate the impact of glazing on denture base resins.
The application of glaze reduced roughness by 0.33 µm and water contact angle by 8.47º, while increasing brightness by 21.30 units (p < 0.001) for 3D-printed resins compared to CT. After thermal cycling, roughness and wettability increased, while brightness decreased (p < 0.05). The glaze also increased hardness, with no adverse effects from thermal cycling (p < 0.001), and enhanced flexural strength for PZ compared to CT (p < 0.001). Additionally, C. albicans colonization decreased by 7.79 log CFU/mL in mixed biofilms for 3D-printed resins compared to CT (p < 0.05).
The application of glaze resulted in smoother, brighter, and harder surfaces for the 3D-printed resins, while also reducing biofilm colonization.
评估上釉义齿基托树脂（热聚合和3D打印）对表面、机械和微生物性能的影响。
使用热聚合义齿基托树脂（CT）和3D打印义齿基托树脂（Yller [YL]、Prizma [PZ]和PrintaX [PX]）制作圆盘（10×3mm）和棒材（64×10×3.3±0.2mm）。将其分为两组：未上釉和上釉。评估表面粗糙度（Ra）、润湿性（接触角）、亮度（GU）和形貌（通过扫描电子显微镜），同时对双菌种生物膜（缓症链球菌和白色念珠菌）进行微生物分析，并对圆盘进行努氏显微硬度测试（n = 10）。对棒材（n = 20）单独进行弯曲强度测试。对一半进行表面和机械性能表征的试样进行热循环（10,000次循环）。采用曼-惠特尼检验（p < 0.05）以及简单和多元线性回归分析（p < 0.20）来评估上釉对义齿基托树脂的影响。
与CT相比，上釉使3D打印树脂的粗糙度降低了0.33µm，水接触角降低了8.47°，同时亮度增加了21.30个单位（p < 0.001）。热循环后，粗糙度和润湿性增加，而亮度降低（p < 0.05）。上釉还提高了硬度，热循环没有产生不利影响（p < 0.001），并且与CT相比，PZ的弯曲强度增强（p < 0.001）。此外，与CT相比，3D打印树脂的混合生物膜中白色念珠菌的定植减少了7.79 log CFU/mL（p < 0.05）。
上釉使3D打印树脂表面更光滑、更亮且更硬，同时也减少了生物膜定植。
