• Title/Summary/Keyword: orthograde placement

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Failure of orthograde MTA filling: MTA wash-out? (Orthograde MTA 충전의 실패)

  • Kim, Yu-Ran;Lee, Chan-Young;Kim, Eui-Seoung;Jung, Il-Young
    • Restorative Dentistry and Endodontics
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    • v.36 no.6
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    • pp.510-514
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    • 2011
  • Mineral trioxide aggregate (MTA), which was originally developed for repair of root perforations, is a biocompatible material with numerous clinical applications in endodontics. MTA must be allowed to set in the presence of moisture to optimize the material's physical and chemical properties. In the clinic, occasionally unset MTA has been detected after application of MTA on the tooth, and the reason has been unclear. This case report presents MTA washed-out for several years after placement at the root apex as an apical plug, and discusses the reason and things to consider in clinics.

EFFECTS OF CONDENSATION TECHNIQUES AND CANAL SIZES ON THE MICROLEAKAGE OF ORTHOGRADE MTA APICAL PLUG IN SIMULATED CANALS (모조 근관의 크기와 충전 방법이 orthograde MTA apical plug의 미세누출에 미치는 영향)

  • Nam, Deuk-Lim;Park, Jeong-Kil;Hur, Bock;Kim, Hyeon-Cheol
    • Restorative Dentistry and Endodontics
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    • v.34 no.3
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    • pp.208-214
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    • 2009
  • The purpose of this study was to compare the dye leakage of MTA (mineral trioxide aggregate) apical plug produced by two orthograde placement techniques (hand condensation technique and ultrasonically assisted hand condensation technique). To simulate straight canal, 60 transparent acrylic blocks with straight canal were fabricated. These transparent acrylic blocks were divided into 2 groups (Group C; hand condensation technique (HC) and Group U; ultrasonically assisted hand condensation technique (UAHC)) of 30 blocks with each MTA application method. Each group was divided into 2 subgroups (n=15) with different canal size of #70 (subgroup C70 and subgroup U70) and #120 (subgroup C120 and subgroup U120). After apical plug was created, a wet paper point was placed over the MTA plug and specimen was kept in a humid condition at room temperature to allow MTA to set. After 24 hours, remaining canal space was backfilled using Obtura II. All specimens were transferred to floral form socked by 0.2% rhodamine B solution and stored in 100% humidity at room temperature. After 48 hours, resin block specimens were washed and scanned using a scanner. The maximum length of micro leakage was measured from the scanned images of four surfaces of each resin block using Photoshop 6.0. Statistical analysis was performed with Mann-Whitney U test. Group U of UAHC had significantly lower leakage than Group C of HC in #70-size canal (subgroup U70) (p<0.05).