Ibrahim Reham Hesham, ElKassas Dina Wafik, Nabih Sameh Mahmoud, Salem Mennatallah Naguib, Haridy Rasha
Conservative Dentistry Department (Restorative Division), Faculty of Oral and Dental Medicine, Misr International University, Cairo 11785, Egypt.
Department of Clinical Dental Sciences, College of Dentistry, Princess Nourah bint Abdulrahman University, P.O. Box 84428, Riyadh 11671, Saudi Arabia.
J Funct Biomater. 2025 Jun 17;16(6):225. doi: 10.3390/jfb16060225.
Fiber-reinforced composites (FRCs) are recognized for enhancing the fracture resistance of structurally compromised teeth. However, the optimal orientation and placement of fibers in direct resin composite restorations remain under debate. This study aimed to evaluate the fracture resistance of maxillary premolars with mesio-occluso-distal (MOD) cavities restored using polyethylene fibers with different placement techniques, compared to conventional incremental composite restoration.
Sixty intact maxillary premolars were randomly assigned to six groups (n = 10). Group 1: intact teeth (positive control); Group 2: MOD cavity without restoration (negative control); Group 3: MOD cavity restored with nanohybrid composite using the incremental technique; Group 4: polyethylene fiber placed on the pulpal floor; Group 5: fiber placed circumferentially along cavity walls (wall-papering technique); Group 6: fiber placed buccolingually in an occlusal groove (occlusal splinting). Fracture resistance was assessed using a universal testing machine. Failure mode was also analyzed.
Group 6 (occlusal splinting) exhibited the highest fracture resistance (1137.72 ± 316.20 N), significantly exceeding Group 3 (546.93 ± 59.89 N) and other fiber-reinforced groups ( < 0.05). Failure mode analysis revealed no significant differences between the fiber-reinforced groups and the intact teeth. Group 6 also had the highest percentage of restorable fractures (90%).
Incorporating polyethylene fibers, especially through occlusal splinting, significantly improves fracture resistance in MOD-restored maxillary premolars. This technique may offer a promising alternative to conventional composite restorations in structurally weakened posterior teeth.
纤维增强复合材料（FRCs）因能增强结构受损牙齿的抗折性而得到认可。然而，直接树脂复合材料修复体中纤维的最佳取向和放置方式仍存在争议。本研究旨在评估采用不同放置技术的聚乙烯纤维修复近中-牙合-远中（MOD）洞型的上颌前磨牙的抗折性，并与传统的分层复合树脂修复进行比较。
将60颗完整的上颌前磨牙随机分为6组（每组n = 10）。第1组：完整牙齿（阳性对照）；第2组：未修复的MOD洞型（阴性对照）；第3组：采用分层技术用纳米混合复合材料修复MOD洞型；第4组：在髓室底放置聚乙烯纤维；第5组：沿洞壁周向放置纤维（贴壁技术）；第6组：在牙合面沟内颊舌向放置纤维（牙合面夹板技术）。使用万能试验机评估抗折性。同时分析失败模式。
第6组（牙合面夹板技术）表现出最高的抗折性（1137.72 ± 316.20 N），显著超过第3组（546.93 ± 59.89 N）和其他纤维增强组（P < 0.05）。失败模式分析显示纤维增强组与完整牙齿之间无显著差异。第6组可修复性骨折的百分比也最高（90%）。
加入聚乙烯纤维，尤其是通过牙合面夹板技术，可显著提高MOD修复的上颌前磨牙的抗折性。该技术可能为结构薄弱的后牙传统复合树脂修复提供一种有前景的替代方法。
