Scientific article
Open access

Could different direct restoration techniques affect interfacial gap and fracture resistance of endodontically treated anterior teeth?

Published inClinical oral investigations, vol. 25, no. 10, p. 5967-5975
Publication date2021-10
First online date2021-04-15

To evaluate different direct restoration techniques on various cavity designs in anterior endodontically treated teeth (ETT).

Ninety upper central incisors (n = 90) were selected, endodontically treated, and divided into three groups (n = 30) accordingly to the cavity design: minimal endodontic cavity access (group A), endodontic access + mesial class III cavity (group B), and endodontic access + two class III cavities (group C). Three subgroups (n = 10) were then created accordingly to the restoration technique: nano hybrid composite restoration (subgroup a), glass fiber post + dual-cure luting cement (subgroup b), and bundled glass fiber + dual-cure luting cement (subgroup c). Samples underwent micro-CT scan, chewing simulation, and a second micro-CT scan. 3D quantification (mm3) of interfacial gap progression was performed; then, samples underwent fracture resistance test. Data were statistically analyzed setting significance at p < 0.05.

Groups A and B showed significantly lower interfacial gap progression compared with group C. Subgroup b performed significantly better compared with subgroups a and c. Improved fracture strength was reported for group C compared with group A, while both subgroups b and c performed better than subgroup a.

Cavity design significantly influenced interfacial gap progression and fracture resistance. Fiber posts significantly lowered gap progression and improved fracture resistance while bundled fibers only increased fracture resistance. A significant reduction of non-repairable fractures was recorded when fibers were applied.

A minimally invasive approach, conserving marginal crests, should be applied whenever possible. Inserting a fiber post is indicated when restoring anterior ETT, in order to reduce gap progression, improve fracture resistance, and avoid catastrophic failures.

  • 3D interfacial gap
  • Endodontically treated teeth
  • Fracture pattern
  • Fracture resistance
  • Micro-CT
  • Post
  • Composite Resins
  • Dental Stress Analysis
  • Humans
  • Post and Core Technique
  • Tooth Fractures
  • Tooth, Nonvital
Citation (ISO format)
COMBA, Allegra et al. Could different direct restoration techniques affect interfacial gap and fracture resistance of endodontically treated anterior teeth? In: Clinical oral investigations, 2021, vol. 25, n° 10, p. 5967–5975. doi: 10.1007/s00784-021-03902-y
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Article (Published version)
ISSN of the journal1432-6981

Technical informations

Creation11/22/2021 7:24:00 AM
First validation11/22/2021 7:24:00 AM
Update time03/16/2023 1:57:45 AM
Status update03/16/2023 1:57:44 AM
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