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The influence of different access cavity designs on the fracture strength in endodontically treated mandibular anterior teeth
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Original Article The influence of different access cavity designs on the fracture strength in endodontically treated mandibular anterior teeth
Young-Gyun Lee, Hye-Jin Shin, Se-Hee Park, Kyung-Mo Cho, Jin-Woo Kim
Journal of Korean Academy of Conservative Dentistry 2004;29(6):515-519.
DOI: https://doi.org/10.5395/JKACD.2004.29.6.515
Published online: November 30, 2004

Department of Conservative Dentistry, College of Dentistry, Kangnung National University, Korea.

Corresponding author: Jin-Woo Kim. Department of Conservative Dentistry, College of Dentistry, Kangnung National University, Jibyun-Dong, Kangnung City, Kangwon-Do, Korea, 210-702. Tel: 82-33-640-3189, Fax: 82-33-640-3113, mendo7@kangnung.ac.kr

Copyright © 2004 Korean Academy of Conservative Dentistry

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  • Straight access cavity design allows the operator to locate all canals, helps in proper cleaning and shaping, ultimately facilitates the obturation of the canal system. However, change in the fracture strength according to the access cavity designs was not clearly demonstrated yet. The purpose of this study was to determine the influence of different access cavity designs on the fracture strength in endodontically treated mandibular anterior teeth.
    Recently extracted mandibular anterior teeth that have no caries, cervical abrasion, and fracture were divided into three groups (Group 1 : conventional lingual access cavity, Group 2 : straight access cavity, Group 3 : extended straight access cavity) according to the cavity designs. After conventional endodontic treatment, cavities were filled with resin core material. Compressive loads parallel to the long axis of the teeth were applied at a crosshead speed of 2mm/min until the fracture occurred. The fracture strength analyzed with ANOVA and the Scheffe test at the 95% confidence level.
    The results of this study were as follows :

    • 1. The mean fracture strength decrease in following sequence Group 1 (558.90 ± 77.40 N), Group 2 (494.07 ± 123.98 N) and Group 3 (267.33 ± 27.02 N).

    • 2. There was significant difference between Group 3 and other groups (P = 0.00).

    Considering advantage of direct access to apical third and results of this study, straight access cavity is recommended for access cavity form of the mandibular anterior teeth.
  • Keywords: Access cavity form; Lingual access cavity; Straight access cavity; Fracture strength; Mandibular anterior teeth
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Figure 1
Access cavity forms used in this study
jkacd-29-515-g001.jpg
Figure 2
Schematic diagram of specimen used in this study
jkacd-29-515-g002.jpg
Table 1
Experimental groups of this study
jkacd-29-515-i001.jpg
Table 2
Fracture strength of experimental groups (N).

* : p = 0.00

jkacd-29-515-i002.jpg

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        The influence of different access cavity designs on the fracture strength in endodontically treated mandibular anterior teeth
        J Korean Acad Conserv Dent. 2004;29(6):515-519.   Published online November 30, 2004
        DOI: https://doi.org/10.5395/JKACD.2004.29.6.515
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      The influence of different access cavity designs on the fracture strength in endodontically treated mandibular anterior teeth
      Image Image
      Figure 1 Access cavity forms used in this study
      Figure 2 Schematic diagram of specimen used in this study

      Figure 1

      Figure 2

      The influence of different access cavity designs on the fracture strength in endodontically treated mandibular anterior teeth

      Experimental groups of this study

      Fracture strength of experimental groups (N).

      * : p = 0.00
      Table 1 Experimental groups of this study

      Table 2 Fracture strength of experimental groups (N).

      * : p = 0.00

      Table 1

      Table 2

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