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KMID : 0362420090470010053
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Journal of Korean Academy of Prosthodontics
2009 Volume.47 No. 1 p.53 ~ p.60
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Microleakage of endodontically treated teeth restored with three different esthetic post and cores
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Park Ji-Geun
Park Jin-Man
Park Eun-Jin
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Abstract
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Statement of problem: At present, as the esthetic demands are on the increase, there are many ongoing studies for tooth-colored post and cores. Most of them are about fiber post and prefabricated zirconia post, but few about one-piece milled zirconia post and core using CAD/CAM (computer-aided design / computer-aided manufacturing) technique.
Purpose: The objective of this study was to compare microleakage of endodontically treated teeth restored with three different tooth-colored post and cores.
Material and methods: Extracted 27 human maxillary incisors were cut at the cementoenamel junction, and the teeth were endodontically treated. Teeth were divided into 3 groups (n = 9); restored with fiber post and resin core, prefabricated zirconia post and heat - pressed ceramic core, and CAD/CAM milled zirconia post and core. After the preparation of post space, each post was cemented with dual-polymerized resin cement (Variolink II). Teeth were thermocycled for 1000 cycles between 5 - 55℃ and dyed in 2% methylene blue at 37℃ for 24 hours. Teeth were sectioned (bucco - lingual), kept the record of microleakage and then image-analyzed using a microscope and computer program. The data were analyzed by one-way ANOVA and Scheffe′s multiple range test (α= 0.05).
Results: All groups showed microleakage and there were no significant differences among the groups (P > .05).
Prefabricated zirconia post and heat-pressed ceramic core showed more leakage in dye penetration at the post - tooth margin, but there was little microleakage at the end of the post. Fiber post and resin core group and CAD/CAM milled zirconia post and core group indicated similar microleakage score in each stage.
Conclusion: Prefabricated zirconia post and heat-pressed ceramic core group demonstrated better resistance to leakage, and fiber post and resin core group and CAD/CAM milled zirconia post and core group showed the similar patterns. The ANOVA test didn’t indicate significant differences in microleakage among test groups. (P > .05)
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KEYWORD
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Fiber post, Zirconia post, CAD/CAM milled zirconia post and core, Thermocycling, Microleakage
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