Comparison of the fracture resistance and fracture patterns of root-filled maxillary premolars restored with different post systems and composite-based post space restorations: an in vitro study

Abidin, Sulhi and Mohd Radzi, Hanna Nadhirah and Mat Daud, Muhamad Sharifuddin and Ahmad, Norfaezah and Hj. Ahmad Nadzirin, Izzuddin and Sim, Galvin Siang Lin (2026) Comparison of the fracture resistance and fracture patterns of root-filled maxillary premolars restored with different post systems and composite-based post space restorations: an in vitro study. Journal of Dental Research Dental Clinics Dental Prospects, 20 (2). pp. 126-132. ISSN 2008-210X E-ISSN 2008-2118

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Abstract

Introduction: Root-filled teeth are structurally and biomechanically weakened, and the choice of post-endodontic restoration is important. This study compared the fracture resistance and fracture patterns of root-filled maxillary premolars restored with different post systems and composite-based post space restorations. Methods: One hundred extracted maxillary second premolars were endodontically treated and randomly allocated to five groups (n=20): metal post (group A), fiber post (group B), flowable composite resin in the post space (group C), fiber-reinforced composite resin in the post space (group D), and composite resin restoration without post with a glass ionomer orifice barrier (control, group E). All the specimens received a standardized mesio-occluso-distal (MOD) cavity preparation with preservation of the buccal wall and were restored with nanohybrid composite before axial loading in a universal testing machine to determine fracture resistance. Meanwhile, fracture patterns were classified under a stereomicroscope. Results: Mean (±standard deviation) fracture resistance values were metal post (896.26±335.55 N), fiber post (1046.64±336.65 N), flowable composite resin (937.94±323.83 N), fiber-reinforced composite resin (799.90±244.43 N), and control (973.54±357.33 N), with no statistically significant differences between the groups (P=0.175). Metal and fiber post groups predominantly exhibited favorable, restorable Class 2 fractures, whereas flowable composite resin, fiber-reinforced composite resin, and control groups mainly demonstrated Class 3 or Class 4 fractures. Conclusion: Root-filled teeth restored with or without posts exhibited similar fracture resistance. Fiber and metal posts, however, produced more favorable fracture patterns, suggesting that posts can influence failure mode even without increasing overall fracture strength.

Item Type:	Article (Journal)
Uncontrolled Keywords:	Endodontics, Fiber post, Metal post, Prosthodontics, Root canal, Tooth fracture
Subjects:	R Medicine > RK Dentistry
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Allied Health Sciences Kulliyyah of Allied Health Sciences > Department of Biomedical Science (Effective:1st July 2011) Kulliyyah of Dentistry > Department of Prosthodontics Kulliyyah of Dentistry > Department of Restorative Dentistry
Depositing User:	Dr Galvin Sim Siang Lin
Date Deposited:	19 Aug 2026 15:31
Last Update:	19 Aug 2026 15:31
Queue Number:	2026-08-Q4827
URI:	http://irep.iium.edu.my/id/eprint/130909

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