J Korean Acad Conserv Dent.  2009 Sep;34(5):383-389. 10.5395/JKACD.2009.34.5.383.

Fracture resistance of crown-root fractured teeth repaired with dual-cured composite resin and horizontal posts

Affiliations
  • 1Department of Conservative Dentistry, The institute of Oral Health Science, Samsung Medical Center, Sungkyunkwan University School of Medicine, Korea. dspark@skku.edu
  • 2Department of Dental Biometerials Science, School of Dentistry, Seoul National University, Korea.
  • 3Dental Research Institute, School of Dentistry, Seoul National University, Korea.
  • 4Department of Orthodontics, The institute of Oral Health Science, Samsung Medical Center, Sungkyunkwan University School of Medicine, Korea.

Abstract

The purpose of this study was to investigate the fracture resistance of crown-root fractured teeth repaired with dual-cured composite resin and horizontal posts. 48 extracted human premolars were assigned to control group and three experimental groups. Complete crown-root fractures were experimentally induced in all control and experimental teeth. In the control group, the teeth (n=12) were bonded with resin cement and endodontically treated. Thereafter, the access cavities were sealed with dual-cured composite resin. In composite resin core - post group (n=12), the teeth were endodontically treated and access cavities were sealed with dual-cured composite resin. In addition, the fractured segments in this group were fixed using horizontal posts. In composite resin core group (n=12), the teeth were endodontically treated and the access cavities were filled with dual-cured composite resin without horizontal posts. In bonded amalgam group (n=12), the teeth were endodontically treated and the access cavities were sealed with bonded amalgam. Experimental complete crown-root fractures were induced again on repaired control and experimental teeth. The ratio of fracture resistance to original fracture resistance was analyzed with Kruskal-Wallis test. The results showed that teeth in control and composite resin core - post group showed significantly higher resistance to re-fracture than those in amalgam core group (p < 0.05). The resistance to refracture was high in the order of composite resin - post group, control group, composite resin group and bonded amalgam group. Within the scope of this study, the use of horizontal post could be beneficial in increasing the fracture resistance of previously fractured teeth.

Keyword

bonded amalgam; crown-root fracture; dual-cured composite resin; fracture resistance; horizontal post

MeSH Terms

Bicuspid
Control Groups
Humans
Resin Cements
Tooth
Resin Cements
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