Effect of fiber-reinforced direct restorative materials on the fracture resistance of endodontically treated mandibular molars restored with a conservative endodontic cavity design

• Published in: Clinical oral investigations 2024-05, Vol.28 (6), p.316, Article 316
• Main Authors: Nezir, Merve, Dinçtürk, Beyza Arslandaş, Sarı, Ceyda, Alp, Cemile Kedici, Altınışık, Hanife
• Format: Article
• Language: English
• Subjects: Composite materials; Composite Resins - chemistry; Dental caries; Dental Cavity Preparation - methods; Dental Materials - chemistry; Dental Restoration, Permanent - methods; Dental Stress Analysis; Dentistry; Fractures; Glass - chemistry; Humans; In Vitro Techniques; Mandible; Materials Testing; Mechanical properties; Medicine; Molar; Molars; Post and Core Technique; Root Canal Therapy - methods; Root canals; Statistical analysis; Statistics; Teeth; Tooth Fractures - therapy; Tooth, Nonvital - therapy
• ISSN: 1436-3771; 1432-6981; 1436-3771
• DOI: 10.1007/s00784-024-05720-4

Objective This study aimed to evaluate the fracture strength of teeth restored using fiber-reinforced direct restorative materials after endodontic treatment with a conservative mesio-occlusal access cavity design. Materials and methods A total of 100 extracted intact mandibular first molars were selected and distributed into a positive control group where teeth left intact and the following four test groups comprised of teeth with conservative mesio-occlusal access cavities that had undergone root canal treatment ( n  = 20/group): access cavity without restoration (negative control), bulk-fill resin composite with horizontal glass fiber post reinforcement, fiber-reinforced composite with bulk-fill resin and bulk-fill resin composite. Following thermocycling (10,000 cycles), fracture resistance was measured using a universal testing machine. Statistical analyses (one-way analysis of variance and the Tamhane test) were performed, and statistical significance was set at p