Aneesha Pratti N, Suresh Babu Muvva, Vineela Gottumukkala, Devarapalli Samyuktha, Chowdary Navya K, Shaik Husnara
Department of Prosthodontics, Sibar Institute of Dental Sciences, Guntur, IND.
Cureus. 2025 Jul 28;17(7):e88946. doi: 10.7759/cureus.88946. eCollection 2025 Jul.
Introduction This in vitro study aimed to evaluate and compare the adaptation accuracy of two commercially available denture base polymers: visible light-cured (VLC) resin and thermoplastic resin. The specific objectives were to assess the adaptation accuracy of each material at different anatomical sites and to determine which material offered a superior fit across the denture-bearing maxillary arch. Materials and methods This cross-sectional study was conducted at the Department of Prosthodontics, Sibar Institute of Dental Sciences, Guntur, India, between June and December 2024. Forty standardized edentulous maxillary casts were fabricated using a silicone mold (Zhermack S.p.A., Badia Polesine, Italy) and Type III dental stone (Kalabhai Karson Pvt. Ltd., Mumbai, India). The samples were randomly divided into two groups of 20. Group A (n=20) used VLC resin sheets (Delta VLC, Delta Dental Solutions, Chennai, India), which were adapted to the casts using finger pressure and cured in a light-curing unit (Triad 2000, Dentsply Sirona, Charlotte, North Carolina, USA). Group B (n=20) consisted of thermoplastic denture base sheets (3A Medes, Seoul, South Korea) adapted using a vacuum-forming machine (Biostar; Scheu-Dental GmbH, Iserlohn, Germany) under consistent heat and pressure. All samples were transversely sectioned at the canine, molar, and posterior mid-palatal regions. Adaptation accuracy at nine specific points was measured using a stereomicroscope (Leica M205 C; Leica Microsystems, Wetzlar, Germany) at 20x magnification. Results Statistically significant differences were observed both within and between the groups. VLC resins demonstrated the best adaptation in the canine region (mean: 370.37 µm), whereas thermoplastic resins showed superior adaptation in the posterior mid-palatal region (mean: 310.79 µm). Overall, the thermoplastic resins exhibited significantly lower mean discrepancies (430.32 µm) than VLC resins (570.05 µm), with the greatest difference observed in the posterior mid-palatal region (p<0.001). Conclusion Thermoplastic denture base materials provided better adaptation accuracy than VLC resins, particularly in the anatomically challenging posterior regions. These findings suggest that thermoplastic resins may offer improved clinical outcomes in cases where a precision fit is essential.
引言 本体外研究旨在评估和比较两种市售义齿基托聚合物的适配精度：可见光固化（VLC）树脂和热塑性树脂。具体目标是评估每种材料在不同解剖部位的适配精度，并确定哪种材料在上颌义齿承托区能提供更优的贴合度。
材料与方法 本横断面研究于2024年6月至12月在印度贡图尔市西巴尔牙科学院口腔修复科进行。使用硅橡胶模具（意大利巴迪亚波莱塞纳的Zhermack S.p.A.公司）和III型牙科石膏（印度孟买的卡拉拜卡尔森私人有限公司）制作了40个标准化的无牙上颌模型。样本被随机分为两组，每组20个。A组（n = 20）使用VLC树脂片（印度金奈的Delta Dental Solutions公司的Delta VLC），通过手指按压使其适配模型，并在美国北卡罗来纳州夏洛特市登士柏西诺德公司的Triad 2000光固化机中固化。B组（n = 20）由热塑性义齿基托片（韩国首尔的3A Medes公司）组成，使用德国伊瑟隆的Scheu-Dental GmbH公司的Biostar真空成型机在恒定的热量和压力下进行适配。所有样本在尖牙、磨牙和腭中后部区域进行横向切片。使用徕卡M205 C立体显微镜（德国韦茨拉尔的徕卡显微系统公司）在20倍放大倍数下测量九个特定点的适配精度。
结果 组内和组间均观察到统计学上的显著差异。VLC树脂在尖牙区域显示出最佳适配度（平均值：370.37 µm），而热塑性树脂在腭中后部区域表现出更优的适配度（平均值：310.79 µm）。总体而言，热塑性树脂的平均差异（430.32 µm）显著低于VLC树脂（570.05 µm），在腭中后部区域观察到的差异最大（p < 0.）。
结论 热塑性义齿基托材料比VLC树脂提供了更好的适配精度，特别是在解剖结构复杂的后部区域。这些发现表明，在需要精确贴合的情况下，热塑性树脂可能会带来更好的临床效果。
