A Comparative Study of Fracture Resistance of Various Intraradicular Devices at Different Angles of Load Application

Main Article Content

P. Venkata Ratna Deepak
Dolanchanpa Dasgupta
Himadri Sekhar Pal
Kavan Patel
Sareen Duseja
Vilas Patel


Aims: Intraradicular posts are recommended to aid in the retention of artificial crowns and support the teeth by distributing intraoral forces along the roots. The purpose of this in vitro study was to compare fracture resistance of different types of endodontic posts viz threaded metal post, fiber post and the positive locking post and variance in regard to length, diameter and load application at different angles to simulate different positions of tooth in normal, prognathic and retrognathic conditions.

Materials and method: For the purpose of this study fifteen extracted human maxillary central incisors per parameter were selected randomly. All the teeth were sectioned transversely at cemento-enamel junction and the roots were endodontically treated. The following intraradicular retentive devices were selected and used in the specimen:

I.Stainless steel threaded posts of Mani EG make with diameters of:

  1. 1.25mm with length of 9.5mm, 12mm and 14.5mm.

  2. 1.45mm with 9.5mm, 12mm and 14.5mm.

  3. 1.65mm with 9.5mm, 12mm and14.5mm.

  4. Easy fiber posts of Dentsply make with diameter of:

  5. 1.83mm with length of 9.5mm, 12mm and 14.5 mm.

  6. 2.04mm with length of 9.5mm, 12mm and 14.5mm.

  7. 2.22mm with length of 9.5mm, 12mm and 14.5mm

III. Meisinger’s Wurzburger stift (Positive locking post) made of titanium with diameter of 4.5mm and maximum insertion depth of 2.75mm.

All of the preformed intraradicular posts were cemented with glass ionomer luting cement. Specimens were submitted to a compressive load in a universal testing machine, Instron to determine the fracture resistance. The failure load was recorded and analyzed between three subgroups. The results obtained were tabulated and subjected to statistical analysis for result.

Results: The results of the present study indicate that with increase in diameter of threaded posts, fracture resistance increased for all lengths. The highest fracture resistance was attained by highest diameter of 1.65mm and length of 14.5mm for all angles. Fiber posts exhibited decreasing fracture resistance as the diameters increased across all lengths. The results also indicate that with increase in length of threaded posts, fracture resistance increased across all diameters. The highest fracture resistance was obtained for length of 14.5mm. Fiber posts exhibited increasing fracture resistance with increase in length across all diameters. The results showed as the length increased, fracture resistance increased in threaded and fiber posts which signify that length is important for fracture resistance. But positive locking post with dimensions of length 2.75mm and diameter 4.5mm had higher fracture resistance irrespective of length and diameter of threaded post and fiber posts. This study confirmed that the angulation of loading is a factor apart from different lengths and diameters affecting the absolute failure loads measured in static tests. Statistically, the pooled average fracture resistance showed that increased from 450 through 1350 for all the post types used.

Conclusion: The threaded post which is made of stainless steel is more ductile and as diameter and length of the threaded post increased, the material gave the strength leading to higher fracture resistance. Fiber post which has modulus of elasticity similar to dentin depended upon the remaining dentin for fracture resistance and hence as the diameter increased fracture resistance decreased and as length increased fracture resistance increased. Positive locking post which is made of titanium is short in length and wider in diameter. It distributes stresses over a large area at the post tooth interface and hence provided highest fracture resistance.

The average pooled highest fracture resistances recorded at 900 and 700 angles showed that fiber post can be considered for use in retroganthic and prognathic situations while threaded post which recorded higher fracture resistance at 1350 can be used in class I situations. For normal, retrognathic and prognathic situations the choice of intraradicular device was positive locking post as it had the highest fracture resistance at all angles. All the posts performed better in normal followed by retrognathic and prognathic loads.

Article Details

How to Cite
P. Venkata Ratna Deepak, Dolanchanpa Dasgupta, Himadri Sekhar Pal, Patel, K. ., Duseja, S. ., & Patel, V. . (2023). A Comparative Study of Fracture Resistance of Various Intraradicular Devices at Different Angles of Load Application. Journal of Coastal Life Medicine, 11(1), 1783–1808. Retrieved from https://www.jclmm.com/index.php/journal/article/view/589


Bitter K and Kielbassa AM: Post-endodontic restorations with adhesively luted fiber reinforced composite post systems: a review. Am J Dent, 2007, Vol 20, p 353-360.

Mitsui FHO, Marchi. M S V GM, Pimenta LAF and Ferraresi PM V: In vitro study of fracture resistance of bovine roots using different intraradicular post systems.Quintessence Int, 2004, Vol 35, p 612-616.

Accacio LD, Jefferson RP, Fabio KS, Luiz FP and Gerson B: Comparison of the fracture resistance of endodontically treated teeth restored with prefabricated posts and composite resin cores with different post lengths. J.Appl. Oral Sci, 2007, Vol 15, No 1, P 29-32.

Raygot CG, Chai J and Jameson DLL: Fracture Resistance and Primary Failure Mode of Endodontically Treated Teeth Restored with a Carbon Fiber–Reinforced Resin Post System In Vitro. Int J Prosthodont, 2001, Vol 14, p 141–145.

King PA and Setchell DJ: An in vitro evaluation of a prototype CFRC prefabricated post developed for the restoration of pulp less teeth. J.Oral Rehabil, 1990, Vol 17, p 599-609.

Malquarti G, Berruet RG and Bois D: Prosthetic use of carbon fiber –reinforced epoxy resin for esthetic crowns and fixed partial dentures. J Prosthet Dent, 1990, Vol 63, p 251-7.

Rovatti L, Mason PN and Dallori A: New research on endodontic carbon fiber posts. Minerva stomata, 1994, Vol 43, p 557-63.

Viguie G, Malquarti G, Vincent B and Bourgeois D: Epoxy/carbon composite resins in dentistry: Mechanical properties related to fiber reinforcements. J Prosthet Dent, 1994, Vol 72, p 245-9.

Purton DE and Payne JA: Comparison of carbon fiber and stainless steel root canal post. Quintessence Int, 1996, Vol 27, p 93-7.

Galhano GA, Valandro LF and De Melo RM: Evaluation of the flexural strength of carbon fiber, quartz fiber, and glass fiber- based posts. J. Endod, 2005, Vol 31, p 209-11.

Burnell SC. Improved cast dowel and base for restoring endodontically treated teeth. J Am Dent Assoc, 1964, Vol 68, p39-45.

Henry PJ: Photo elastic analysis of post core restorations. Aust Dent J, 1977, Vol 22, p 157-9.

Hirschfeld Z and Stern N: Post and core-the biomechanical aspect. Aust Dent J, 1972, Vol 17, p 467-8.

Perel ML and Muroff FI: Clinical criteria for posts and cores. J Prosthet Dent 1972, Vol 28, p 405-11.

Stern N and Hirshfeld Z: Principles of preparing endodontically treated teeth for dowel and core restorations. J Prosthet Dent, 1973, Vol 30, p 162-5.

Krupp JD and Caputo AA: Cementing mediums and retentive characteristics of dowels. J Prosthet Dent, 1974, Vol 32, p 551-7.

Barjau-Escribano A, Sancho-Bru JL, Forner-Navarro L, Rodríguez-Cervantes PJ, Pérez-González A and Sánchez-Marín FT: Influence of Prefabricated Post Material on Restored Teeth: Fracture Strength and Stress Distribution. Operative Dentistry, 2006, Vol.31, No.1, p 47-54.

Yang HS, Lang LA, Molina A and Felton DA: The effects of dowel design and load direction on dowel and core restorations. J Prosthet Dent, 2001, Vol 85, p 558-567.

Thorat A and Ram SM: A finite element analysis of stresses in endodontically treated teeth restored with three post materials and the effect of varying coronal and loading angulations on radicular dentin and alveolar bone. J Ind Prosthet Dent Soc, 2004, Vol 4, No 2, p 3-6.

Steiner CC: The use of cephlometrics as an aid to planning and assessing orthodontic treatment. Am.J.Ortho, 1960, Vol 46, p 721-735.

Nergiz I, Schmage P, Ozcan M and Platzer U: Effect of length and diameter of tapered posts on the retention. J.Oral Rehabil, 2002, Vol 29, No 1, p 28-34.

Monzavi. A, Nokar.S and Javadi. H.R: The effects of post diameter on stress distribution in maxillary central incisor, a three dimensional finite element study. J.Dent, Tehran University of medical sciences; Tehran: Iran 2004, Vol 1, No 2, p 17-23.

Marchi. G. M, Mitsui F.H.O and Cavalcanti. A.N: Effect of remaining dentine structure and thermal-mechanical aging on the fracture resistance of bovine roots with different post and core systems. International Endodontic Journal, 2008, Vol 41, p 969–976.

Kivanc B.H¸ Alacam. T, Ulusoy. O¨.I. A, Genc. O¨¸ and Gorgul. G: Fracture resistance of thin-walled roots restored with different post systems. International Endodontic Journal, 2009, Vol 42, p 997–1000.

Adanir N and Belli S: Evaluation of different post lengths, effect of fracture resistance of a glass fiber post system. Eur. J.Dent, 2008, Vol 2, p 23-28.

Alessandro RG, Leuiz PV, Manoel DS and Sivana MP: In vitro fracture resistance of glass fiber and cast metal posts of different lengths. J Prosthet Dent 2009, Vol 101, No 3, p 183-188.

Ceccin. D, Farina. A.P, Guerreiro. C.A.M. and Carlini. B- Jr: Fracture resistance of roots prosthetically restored with intra-radicular posts of different lengths. Journal of Oral Rehabilitation, 2010, Vol 37, p 116–122.

Holmes DC, Diaz AAM, and Leary JM: Influence of post dimension on stress distribution in dentin. J.Prosthet Dent, 1996, Vol 75, No 2, p 140-147.

Loney RW, Moulding B. M and Ritsco RC: The Effect of Load Angulation on Fracture Resistance of Teeth Restored With Cast Post and Cores and Crowns. The Inter Journ Prosthodont, 1995, Vol 8, p 247-251.

Newman MP, Yaman P, Dennison J, Rafter M and Billy E: Fracture resistance of endodontically treated teeth restored with composite posts. Journal of Prosthetic Dentistry, 2003, Vol 89, p 360–7.

Hayashi M, Takahashi Y, Imazato S and Ebisu S: Fracture resistance of pulpless teeth restored with post-cores and crowns. Dental Materials, 2006, vol 22, p 477–85.

Helkimo E, Carlsson GE and Helkimo M: Bite force and state of dentition. Acta Odontologica Scandinavica, 1977, Vol 35, p 297–303.

Schmitter. M, Lippenberger.S, Rues. S, Gilde. H and Rammelsberg. P: Fracture resistance of incisor teeth restored using fiber-reinforced posts and threaded metal posts: effect of post length, location, pretreatment and cementation of the final restoration. International Endodontic Journal, 2010, Vol 43, p 436–442.