Elsevier

Journal of Endodontics

Volume 15, Issue 8, August 1989, Pages 355-361
Journal of Endodontics

A comparison of three core buildup materials used in conjunction with two post systems in endodontically treated anterior teeth*

https://doi.org/10.1016/S0099-2399(89)80072-XGet rights and content

Fifty extracted maxillary central incisors with the crowns removed 1 mm coronal to the labial cementoenamel junction were endodontically treated. Post spaces were made 7 mm into the roots prior to cementing a 13-mm post with zinc phosphate cement. Twenty-five of the teeth were restored using a #6 (0.060-inch) Para-Post, and the remaining 25 teeth were restored with a #6 Para-Post Plus. Three core buildup materials, Ketac-Silver, Miracle Mix, and Tytin alloy were used in conjunction with the posts. Cast gold copings 10 mm in height with 1 mm collar on the root were cemented to the buildups. The teeth were loaded to failure at 130 degrees to the long axis of the root from the lingual with an instron testing machine. The mean failure load of all of the teeth in this study was 21.6 kg. All of the teeth failed when the posts dislodged from the canals. The Para-Post Plus was not significantly more retentive than the Para-Post. No failures occurred within the buildup materials. No significant differences were demonstrated between the mean failure loads of the different buildup materials. Increased buccolingual root diameter, however, had a positive correlation (r=0.46) with higher failure loads which was statistically significant (p<0.001).

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Cited by (20)

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    2008, Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology and Endodontology
    Citation Excerpt :

    A cellulose mold was used to build up the composite core standardizing the size of the core for all specimens. Specimens were tilted at a 130° angle from the horizontal, and continuous compressive loading was applied, as it was shown to be the most clinically comparable angle of loading in anterior teeth.38,42,46,49 However, other studies used different angulations from horizontal, as 60° angle,18 and 45° angle.5

  • Influence of remaining coronal tooth structure location on the fracture resistance of restored endodontically treated anterior teeth

    2006, Journal of Prosthetic Dentistry
    Citation Excerpt :

    The cast crowns were cemented (Nexus 2; Kerr Dental) under a static 20-N load (Fig. 2).19 A universal testing machine, with a load cell having a maximum capacity of 1000 N (MTS 858; MTS Systems Corp, Eden Prairie, Minn), was used to apply a compressive load to tooth specimens with a crosshead speed of 0.5 cm/min at an angle of 135 degrees to the long axis of teeth10,20 until failure occurred (Fig. 3). This labially inclined compressive force was applied to the notch on the palatal surface of the crowns.

  • Effect of core stiffness on the in vitro fracture of crowned, endodontically treated teeth

    2002, Journal of Prosthetic Dentistry
    Citation Excerpt :

    No significant difference in fracture resistance was found, suggesting that the crown distributed stress from the core onto the tooth root, thereby rendering core stiffness nonsignificant. This finding is in accordance with another study in which the build-up material was the only variable under the loaded crown.20 Control specimens contained only a stainless steel post and dentin core.

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*

This study was partially supported by the Graduate Endodontic Fund, University of Washington, School of Dentistry, Seattle, WA.

1

Dr. Volwiler is a former graduate student, Department of Endodontics, School of Dentistry, University of Washington, Seattle, WA. Dr. Nicholls is professor, Department of Restorative Dentistry, School of Dentistry, University of Washington, Dr. Harrington is professor, Department of Endodontics, School of Dentistry, University of Washington.

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