Department of Restorative Dentistry, Faculty of Dentistry, Zonguldak Bülent Ecevit University, Zonguldak, Turkey.
Department of Endodontics, Faculty of Dentistry, Zonguldak Bülent Ecevit University, Zonguldak, Turkey.
J Appl Biomater Funct Mater. 2024 Jan-Dec;22:22808000241303327. doi: 10.1177/22808000241303327.
Non-carious cervical lesions (NCCLs) are commonly observed in clinical dentistry, leading to tooth fractures, sensitivity, and compromised pulp vitality. Therefore, their restoration is essential for both the aesthetic and structural integrity of teeth. This study aimed to compare the fracture resistance of NCCLs restored using different materials: an injectable universal composite, flowable bulk-fill composites with or without fiber-reinforcement.
Seventy-five double-rooted maxillary premolars were selected for the study. Fifteen teeth were left intact as a control. A wedge-shaped cavity was prepared in the cervical region of the remaining sixty teeth, which were then divided into four groups ( = 15): unrestored, restored with an injectable composite, restored with a flowable bulk-fill composite (SDR flow+), and restored with a flowable short-fiber-reinforced composite (everX Flow™). All teeth underwent fracture testing under oblique static loading at a 30° angle using a universal testing machine. Fracture patterns were classified as repairable, possibly repairable, or unrepairable. Data were analyzed using one-way analysis of variance, Pearson chi-square, and Tukey HSD post hoc tests ( = 0.05).
Intact teeth exhibited the highest fracture resistance (743.481 N), while unrestored teeth showed the lowest (371.49 N) ( < 0.001). There was no significant difference in fracture resistance between the injectable composite (553.289 N) and SDR flow+ (497.368 N) ( = 0.055). The everX Flow™ group displayed significantly higher fracture resistance (673.787 N) ( < 0.001) and a repairability rate of 60% within the restored groups. Unrestored (60%), injectable composite (53.3%), and SDR flow+ (53.3%) groups were mostly unrepairable.
The everX Flow™ demonstrated improved fracture resistance and favorable fracture pattern for maxillary premolars with wedge-shaped NCCLs.
非龋性牙颈部缺损（NCCLs）在临床牙科中较为常见，可导致牙折、敏感和牙髓活力受损。因此，修复这些缺损对于牙齿的美观和结构完整性至关重要。本研究旨在比较使用不同材料修复 NCCLs 的抗折能力：一种可注射通用型复合材料、具有或不具有纤维增强的流动型大体积充填复合材料。
选择 75 颗上颌双尖牙进行研究。15 颗牙作为对照保持完整。在其余 60 颗牙的颈部区域制备楔形缺损，然后将其分为四组（每组 15 颗）：未修复、用可注射复合材料修复、用流动型大体积充填复合材料（SDR flow+）修复、用流动型短纤维增强复合材料（everX Flow™）修复。所有牙齿均在 30°斜向静态加载下使用万能试验机进行断裂测试。根据可修复、可能修复和不可修复的标准对断裂模式进行分类。使用单向方差分析、皮尔逊卡方检验和 Tukey HSD 事后检验进行数据分析（ = 0.05）。
完整牙的抗折力最高（743.481 N），未修复牙的抗折力最低（371.49 N）（ < 0.001）。可注射复合材料（553.289 N）和 SDR flow+（497.368 N）的抗折力无显著差异（ = 0.055）。everX Flow™组的抗折力显著更高（673.787 N）（ < 0.001），且在修复组中可修复率为 60%。未修复组（60%）、可注射复合材料组（53.3%）和 SDR flow+组（53.3%）多为不可修复。
everX Flow™ 对具有楔形 NCCLs 的上颌前磨牙具有提高的抗折力和有利的断裂模式。
