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August 19, 2026BMC Oral HealthOpen Access

Fracture resistance and Weibull reliability of lithium disilicate molar endocrowns with deep margin elevation and polyethylene fiber reinforcement: an in vitro study

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Authors

HAHussein R. AlmarzoogSASara AbtahiMAMarzieh Alikhasi

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Overview

In vitro study demonstrates comparable fracture resistance across conventional, deep margin elevation, and fiber-reinforced molar endocrowns, highlighting the reliability of conservative protocols.

Key Points

  • To evaluate the fracture resistance, failure behavior, and Weibull reliability of lithium disilicate molar endocrowns restored with conventional, deep margin elevation, and polyethylene fiber-reinforced techniques after thermomechanical aging.
  • Forty-two endodontically treated mandibular first molars (N=42, n=14 per group) were prepared and assigned to conventional endocrowns (EC), deep margin elevation with reduced chamber extension (DME-EC), or deep margin elevation with polyethylene fiber reinforcement and no chamber extension (BIO-EC).
  • Specimens underwent 10,000 thermocycles and 480,000 mechanical loading cycles at 50 N before compressive fracture load testing by a blinded examiner.
  • Mean fracture resistance was 4009.70 ± 1024.73 N for Group EC, 3336.90 ± 474.18 N for Group BIO-EC, and 3271.26 ± 734.03 N for Group DME-EC, with no statistically significant difference among groups (p = 0.085).
  • Failure-mode distribution (p = 0.777) and reparability rates (p = 0.591) did not differ significantly across the three restoration protocols.
  • Group EC achieved the highest characteristic strength (4402.83 N), whereas Group BIO-EC achieved the highest Weibull modulus (9.81), indicating greater fracture-load consistency.

Cite This Study

Almarzoog et al. (2026) studied this question.

synapsesocial.com/papers/6a8563eb03308d306e2d7631https://doi.org/10.1186/s12903-026-09575-x
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