Abstract
Statement of problem
The influence of the flexural modulus of prefabricated posts on the fracture resistance
of endodontically treated teeth is unclear.
Purpose
The purpose of this in vitro study was to evaluate the influence of post material
and post diameter on the fracture resistance of endodontically treated mandibular
premolars. In addition, the influence of tooth substance loss was evaluated by comparing
1 with 2 residual dentinal walls.
Material and methods
Sixty-four extracted mandibular first premolars were endodontically treated and divided
into 8 test groups (n=8) based on the number of residual walls (1 or 2), post material
(glass fiber or titanium) and post diameter (International Standards Organization
[ISO] 70 or ISO 90). After luting the posts, the specimens received a composite resin
core and a crown preparation with a 2-mm ferrule. Cast Co-Cr crowns were cemented
with glass ionomer cement. After 1 200 000 mastication cycles with a load of 49 N
and simultaneous thermocycling (5 °C-55 °C), specimens were quasistatically loaded
at 30 degrees to the longitudinal axis of the tooth until fracture. Fracture loads
were analyzed by using 3-way ANOVA (α=.05). Fracture modes were examined with a stereomicroscope
at ×25 magnification and recorded.
Results
Fracture loads ranged from 954 ±35 N (1 residual wall–glass fiber–ISO 70) to 1286
±202 N (1 residual wall–glass fiber–ISO 90). Titanium posts showed a statistically
significant higher fracture resistance than glass fiber posts. A statistically significant
increase in fracture resistance was also observed with increasing post diameter. However,
no significant difference was found with respect to the number of residual walls (P>.05).
Conclusions
Teeth restored with titanium posts exhibited higher fracture resistance than teeth
restored with glass fiber posts, especially when smaller diameter posts were used.
To read this article in full you will need to make a payment
Purchase one-time access:
Academic & Personal: 24 hour online accessCorporate R&D Professionals: 24 hour online accessOne-time access price info
- For academic or personal research use, select 'Academic and Personal'
- For corporate R&D use, select 'Corporate R&D Professionals'
Subscribe:
Subscribe to Journal of Prosthetic DentistryAlready a print subscriber? Claim online access
Already an online subscriber? Sign in
Register: Create an account
Institutional Access: Sign in to ScienceDirect
References
- Factors affecting the fracture resistance of post-core reconstructed teeth: a review.Int J Prosthodont. 2001; 14: 355-363
- Effect of fiber posts on the fracture resistance of endodontically treated anterior teeth with cervical cavities: an in vitro study.J Prosthet Dent. 2016; 116: 80-84
- Effect of fiber posts on the fracture resistance of maxillary central incisors with class III restorations: an in vitro study.J Prosthet Dent. 2017; 118: 55-60
- Fracture strength of endodontically treated maxillary premolars supported by a horizontal glass fiber post: an in vitro study.J Endod. 2015; 41: 907-912
- Fracture resistance of endodontically treated anterior teeth restored with different post systems. An in vitro study.Eur Endod J. 2018; 3: 174-178
- Influence of different post luting cements on the fracture strength of endodontically treated teeth: an in vitro study.Eur Endod J. 2018; 3: 113-117
- Influence of post fit and post length on fracture resistance.Int Endod J. 2009; 42: 47-53
- Influence of post-thickness and material on the fracture strength of teeth with reduced coronal structure.J Conserv Dent. 2013; 16: 139-143
- The influence of substance loss and ferrule height on the fracture resistance of endodontically treated premolars. An in vitro study.Dent Mater. 2013; 29: 1280-1286
- Influence of ferrule, post system, and length on biomechanical behavior of endodontically treated anterior teeth.J Endod. 2014; 40: 119-123
- Randomized controlled clinical pilot trial of titanium vs. glass fiber prefabricated posts: preliminary results after up to 3 years.Int J Prosthodont. 2007; 20: 499-503
- A randomized controlled trial of endodontically treated and restored premolars.J Dent Res. 2012; 91: 72S-78S
- Four-year survival of endodontically treated premolars restored with fiber posts.J Dent Res. 2014; 93: 52S-58S
- Dentin-like versus rigid endodontic post: 11-year randomized controlled pilot trial on no-wall to two-wall defects.J Endod. 2017; 43: 1770-1775
- “Ferrule comes first. Post is second!” Fake news and alternative facts? A systematic review.J Endod. 2018; 44: 212-219
- Mechanisms and risk factors for fracture predilection in endodontically treated teeth.Endod Topics. 2006; 13: 57-83
- Fracture resistance of incisor teeth restored using fibre-reinforced posts and threaded metal posts: effect of post length, location, pretreatment and cementation of the final restoration.Int Endod J. 2010; 43: 436-442
- Fracture resistance of teeth restored with different post systems: in vitro study.Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2008; 106: e77-e83
- In vitro evaluation of the fracture resistance of anterior endodontically treated teeth restored with glass fiber and zircon posts.J Prosthet Dent. 2007; 97: 93-98
- Comparison of fracture resistance between cast posts and fiber posts: a meta-analysis of literature.J Endod. 2013; 39: 11-15
- Influence of cyclic loading on fiber post and composite resin core.Dent Mater J. 2008; 27: 356-361
- Performance of post-retained single crowns: a systematic review of related risk factors.J Endod. 2017; 43: 175-183
- Why, when, and how general practitioners restore endodontically treated teeth: a representative survey in Germany.Clin Oral Investig. 2016; 20: 253-259
- Fracture resistance of thin-walled roots restored with different post systems.Int Endod J. 2009; 42: 997-1003
- The ferrule effect: a literature review.Int Endod J. 2002; 35: 575-581
- Influence of glass-fiber posts on the fracture resistance and failure pattern of endodontically treated premolars with varying substance loss: an in vitro study.J Prosthet Dent. 2011; 105: 387-393
- Effect of ferrule location on the fracture resistance of crowned mandibular premolars: an in vitro study.J Prosthet Dent. 2015; 114: 86-91
- Finite element analysis of stresses in endodontically treated, dowel-restored teeth.J Prosthet Dent. 2005; 94: 321-329
- Comparison of titanium dowel retention using four different luting agents.J Prosthet Dent. 2005; 94: 227-233
- Influence of post material on the fracture resistance of endodontically treated teeth: a laboratory study.Quintessence Int. 2020; 51: 108-115
- In vitro comparison of the fracture resistance and failure mode of fiber, ceramic, and conventional post systems at various stages of restoration.J Prosthodont. 2001; 10: 26-36
- FEM analysis of the mandibular first premolar with different post diameters.Odontology. 2011; 99: 148-154
- Reinforcement effect of adhesively luted fiber reinforced composite versus titanium posts.Dent Mater. 2007; 23: 138-144
- A study of bite force, part 1: relationship to various physical characteristics.Angle Orthod. 1995; 65: 367-372
- Effect of different ferrule designs on the fracture resistance and failure pattern of endodontically treated teeth restored with fiber posts and all-ceramic crowns.J Appl Oral Sci. 2011; 19: 28-33
Article info
Publication history
Published online: August 02, 2020
Footnotes
S.K.V. and A.S. contributed equally to this work.
Identification
Copyright
© 2020 by the Editorial Council for The Journal of Prosthetic Dentistry.
