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HOME > Restor Dent Endod > Volume 33(3); 2008 > Article
Original Article Fracture resistance of the three types of undermined cavity filled with composite resin
Hoon-Soo Choi, Dong-Hoon Shin
2008;33(3):-183.
DOI: https://doi.org/10.5395/JKACD.2008.33.3.177
Published online: May 31, 2008

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Corresponding Author: Dong-Hoon Shin. Department of Conservative Dentistry, College of Dentistry, Dankook University, San 7-1, Shinbu-dong, Cheonan 330-716, Korea. Tel: 82-41-550-1965, Fax: 82-41-550-1963, donyshin@dankook.ac.kr
• Received: February 28, 2008   • Revised: April 14, 2008   • Accepted: April 15, 2008

Copyright © 2008 The Korean Academy of Conservative Dentistry

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  • It was reported that esthetic composite resin restoration reinforces the strength of remaining tooth structure with preserving the natural tooth structure. However, it is unknown how much the strength would be recovered. The purpose of this study was to compare the fracture resistance of three types of undermined cavity filled with composite resin with that of non-cavitated natural tooth.
    Forty sound upper molars were allocated randomly into four groups of 10 teeth. After flattening occlusal enamel, undermined cavities were prepared in thirty teeth to make three types of specimens with various thickness of occlusal structure (Group 1 ~ 3). All the cavity have the 5 mm width mesiodistally and 7 mm depth bucco-lingually. Another natural 10 teeth (Group 4) were used as a control group. Teeth in group 1 have remaining occlusal structure about 1 mm thickness, which was composed of mainly enamel and small amount of dentin. In Group 2, remained thickness was about 1.5 mm, including 0.5 mm thickness dentin. In Group 3, thickness was about 2.0 mm, including 1 mm thickness dentin. Every effort was made to keep the remaining dentin thickness about 0.5 mm from the pulp space in cavitated groups. All the thickness was evaluated with radiographic Length Analyzer program.
    After acid etching with 37% phosphoric acid, one-bottle adhesive (Single Bond™, 3M/ESPE, USA) was applied following the manufacturer's recommendation and cavities were incrementally filled with hybrid composite resin (Filtek Z-250™, 3M/ESPE, USA). Teeth were stored in distilled water for one day at room temperature, after then, they were finished and polished with Sof-Lex system.
    All specimens were embedded in acrylic resin and static load was applied to the specimens with a 3 mm diameter stainless steel rod in an Universal testing machine and cross-head speed was 1 mm/min. Maximum load in case of fracture was recorded for each specimen.
    The data were statistically analyzed using one-way analysis of variance (ANOVA) and a Tukey test at the 95% confidence level.
    The results were as follows:
    1. Fracture resistance of the undermined cavity filled with composite resin was about 75% of the natural tooth.

    2. No significant difference in fracture loads of composite resin restoration was found among the three types of cavitated groups.

    Within the limits of this study, it can be concluded the fracture resistance of the undermined cavity filled with composite resin was lower than that of natural teeth, however remaining tooth structure may be supported and saved by the reinforcement with adhesive restoration, even if that portion consists of mainly enamel and a little dentin structure.
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Figure 1
Schematic drawing of cavity form.
jkacd-33-177-g001.jpg
Figure 2
Length Analyzer Program.
jkacd-33-177-g002.jpg
Figure 3
Measurement of fracture strength.
jkacd-33-177-g003.jpg
Table 1
Fracture Strength (MPa) and ANOVA result

*: Significant difference at p < 0.05

jkacd-33-177-i001.jpg

Tables & Figures

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    • Fracture resistance of crown-root fractured teeth repaired with dual-cured composite resin and horizontal posts
      Seok-Woo Chang, Yong-Keun Lee, Seung-Hyun Kyung, Hyun-Mi Yoo, Tae-Seok Oh, Dong-Sung Park
      Journal of Korean Academy of Conservative Dentistry.2009; 34(5): 383.     CrossRef

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      Fracture resistance of the three types of undermined cavity filled with composite resin
      J Korean Acad Conserv Dent. 2008;33(3):177-183.   Published online May 31, 2008
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    Fracture resistance of the three types of undermined cavity filled with composite resin
    Image Image Image
    Figure 1 Schematic drawing of cavity form.
    Figure 2 Length Analyzer Program.
    Figure 3 Measurement of fracture strength.
    Fracture resistance of the three types of undermined cavity filled with composite resin

    Fracture Strength (MPa) and ANOVA result

    *: Significant difference at p < 0.05

    Table 1 Fracture Strength (MPa) and ANOVA result

    *: Significant difference at p < 0.05


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