Gheorghe Georgiana Florentina, Țâncu Ana Maria Cristina, Amza Oana Elena, Suciu Ioana, Iosif Laura, Cuc Stanca, Petean Ioan, Moldovan Marioara, Dimitriu Bogdan
Department of Endodontics, Faculty of Dentistry, Carol Davila University of Medicine and Pharmacy, 17-23 Calea Plevnei Street, 010232 Bucharest, Romania.
Department of Prosthodontics, Faculty of Dentistry, Carol Davila University of Medicine and Pharmacy, 17-23 Calea Plevnei Street, 010232 Bucharest, Romania.
Dent J (Basel). 2024 Sep 19;12(9):294. doi: 10.3390/dj12090294.
(1) Background: The long-term survival of an endodontically treated tooth depends on a successful root canal treatment as well as an adequate definitive coronal restoration. This study aimed to evaluate the strength of endodontically treated premolars with mesial-occlusal-distal (MOD) cavity preparation restored with different direct coronal restoration materials but from the same manufacturer against fracture. (2) Methods: sixty intact premolars were selected and placed into five groups (n = 12): G1-intact teeth, G2-endodontic treatment and unrestored MOD cavities, G3-endodontic treatment and MOD cavities restored with Tetric PowerFlow and Tetric EvoCeram, G4-endodontic treatment and MOD cavities restored with Multicore Flow and Tetric EvoCeram, and G5-endodontic treatment and MOD cavities restored with Multicore Flow. The specimens were subjected to an axial compression load at a speed of 1.6 mm/min and optically inspected before and after with a stereomicroscope. For each premolars group, the following data were recorded: the compression resistance, the compressive strength, and the maximum force supported. The microstructure of the samples after the compression test was analyzed using scanning electron microscopy (SEM). (3) Results: statistical analysis (ANOVA and Tukey test) showed that there was a statistically significant difference between G1 and the other groups. Even though there was no statistically significant difference between the restored groups, a better mechanical behavior was registered within the G3. (4) Conclusions: this in vitro study indicated that none of the materials used can lead to a higher or at least similar fracture resistance as the intact teeth. The coronal restoration only with nano-hybrid composites may lead to a higher therapeutic benefit for the fracture-susceptible premolars.
(1) 背景：经牙髓治疗的牙齿的长期存活取决于成功的根管治疗以及适当的最终冠部修复。本研究旨在评估用不同直接冠部修复材料（但来自同一制造商）修复近中 - 咬合 - 远中（MOD）洞型制备的经牙髓治疗的前磨牙的抗折强度。(2) 方法：选择60颗完整的前磨牙并分为五组（n = 12）：G1组为完整牙齿；G2组为牙髓治疗且未修复的MOD洞型；G3组为牙髓治疗且用Tetric PowerFlow和Tetric EvoCeram修复的MOD洞型；G4组为牙髓治疗且用Multicore Flow和Tetric EvoCeram修复的MOD洞型；G5组为牙髓治疗且用Multicore Flow修复的MOD洞型。标本以1.6 mm/min的速度承受轴向压缩载荷，并在前后用立体显微镜进行光学检查。对于每组前磨牙，记录以下数据：抗压性、抗压强度和最大支撑力。压缩试验后样品的微观结构用扫描电子显微镜（SEM）分析。(3) 结果：统计分析（方差分析和Tukey检验）表明G1组与其他组之间存在统计学上的显著差异。尽管修复组之间没有统计学上的显著差异，但G3组表现出更好的力学性能。(4) 结论：这项体外研究表明，所使用的材料均不能产生与完整牙齿相同或更高的抗折性。仅用纳米混合复合材料进行冠部修复可能对易折前磨牙带来更高的治疗益处。
