+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

Resistance to horizontal forces of dowel and amalgam-core restorations: a comparative study

Resistance to horizontal forces of dowel and amalgam-core restorations: a comparative study

Journal of Oral Rehabilitation 14(4): 337-344

Four designs of amalgam-core anchorage were compared in a laboratory study for the inability to withstand the horizontal component of occlusal force. Amalgam cores were constructed for extracted teeth with either composite resin-cemented Dentatus dowels, or with Para-post or Flexi-post dowels cemented with phosphate cement. All the posts were of comparable length and diameter. These anchorage designs were compared with each other and to a self-threading (TMS) pin-retained amalgam core, by application of horizontal force and recording forces causing failure. Flexi-post-retained amalgam cores failed at a mean force of 36.5 (+/- 8.5) kg while Dentatus-retained and Para-post-retained cores failed at 41.7 (+/- 8.0) kg and 46.6 (+/- 11.4) kg, respectively. TMS-retained cores resisted forces up to a mean force of 53.5 (+/- 4.5) kg. Patterns of failure varied widely among these groups. Composite resin-cemented Dentatus dowels were retained in the tooth in nine out of ten samples, while none of the ten Flexi-post dowels and only one of the ten Para-post dowels did so. Tooth fracture on failure occurred in seven out of ten Flexi-post-retained cores, while only three out of ten of the Para-post-retained cores and none of the Dentatus dowel-retained cores presented this unrepairable type of failure. Possible reasons for these differences are discussed.

Please choose payment method:

(PDF emailed within 0-6 h: $19.90)

Accession: 041247814

Download citation: RISBibTeXText

PMID: 3305840

DOI: 10.1111/j.1365-2842.1987.tb00727.x

Related references

The effects of dowel design and load direction on dowel-and-core restorations. Journal of Prosthetic Dentistry 85(6): 558-567, 2001

Fracture resistances of cast metal and ceramic dowel and core restorations: a pilot study. Journal of Prosthodontics 14(2): 84-90, 2005

Comparative study of the surface characteristics, microstructure, and magnetic retentive forces of laser-welded dowel-keepers and cast dowel-keepers for use with magnetic attachments. Journal of Prosthetic Dentistry 93(5): 473-477, 2005

A comparative study of fracture resistance between morphologic dowel and cores and a resin-reinforced dowel system in the intraradicular restoration of structurally compromised roots. Quintessence International 27(7): 483-491, 1996

Marginal fractures and corrosion of amalgam restorations. A 3-year report of an experimental clinical study on the reactions of amalgam restorations. Revue Belge de Medecine Dentaire. Belgisch Tijdschrift Voor Tandheelkunde 33(4): 343-362, 1978

Divided dowel and core restorations. Tsurumi Shigaku. Tsurumi University Dental Journal 9(1): 219-226, 1983

Principles of preparing endodontically treated teeth for dowel and core restorations. Journal of Prosthetic Dentistry 30(2): 162-165, 1973

The effect of amalgam bonding on resistance form of Class II amalgam restorations. Quintessence International 29(2): 95, 1998

An amalgam coronal-radicular dowel and core technique for endodontically treated posterior teeth. Journal of Prosthetic Dentistry 43(5): 511-515, 1980

Fracture resistance of extensive amalgam restorations retained by pins, amalgapins and amalgam bonding agents. Operative Dentistry 33(6): 666-674, 2008

Continuous observation of stress distribution on dental roots with 2 dowel and core restorations. Tsurumi University Dental Journal: 399-418, 1984

A technique to reduce distortion of impressions for indirect cast dowel and core restorations. Journal of the Irish Dental Association 49(3): 101-102, 2003

Possibilities of dowel core fabrication under the anchors of fixed restorations--case report. Fogorvosi Szemle 97(2): 77-80, 2004

Continuous observation of the stress distribution on tooth roots with 2-dowel and core restorations. Tsurumi Shigaku. Tsurumi University Dental Journal 10(3): 399-418, 1984

Clinical research on bonded amalgam restorations. Part 1: SEM study of in vivo bonded amalgam restorations. General Dentistry 45(4): 356-60 362, 1997