書誌事項
- タイトル別名
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- Investigation obturating ability of apical area and long-term dentin mineralization change in clinical case after root canal obturation using thermoplasticized obuturation-gutta for 6 years by SEM and SEM-EDS analysis
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<p>Abstract : In Japan, the thermoplastic root canal obturation method, in which obturation-gutta soft (OGS) is heated to about 44°C and injected into the intracanal and which was developed by Otani et al. in 1978, offers superior operability and sealing ability. The author has modified the thermoplasticized method by injecting OGS to a shaped and dried intracanal, and performing diffusion and compression with an Ni-Ti condenser, and obturates the apical foramen so as not to form a dead space by the twin pluggers technique. This modified technique has shown superior clinical results for 28 years. After root canal obturation of 6⌋ by this technique, six years passed as super-structure is not attached without visiting to hospital. We had an opportunity to extract a tooth because the bifurcation caries of 6⌋ cannot be restored. We obtained informed consent from the patient and made an epoxy imbedding sample, and we confirmed the excision direction by microCT. We then investigated the obturating ability and long-term dentin mineralization change of each apical area using SEM and SEM-EDS analysis.</p><p> The results showed that the mesiobuccal root of 6⌋ had a dead space of about 1,360 μm, but there was no interposition of granulation tissue and the central part of the dead space had a narrow segment due to a protrusion (width 292.1 μm, height 127.6 μm). The width was 162.2 μm, which was similar to the physiological apical foramen. As for the composition, both protrusions consisted of Ca : P : Na : Mg : Cl with an average weight ratio (%) of 48.73 : 34.82 : 8.19 : 4.03 : 4.49 by SEM-EDS analysis, and the ratio of Ca/P was 1.40. It is judged that the reparative dentin was formed by such composition elements. In the distobuccal apical area and palatal apical area, mineralization of each apical foramen was observed. It was considered that reparative dentin and cementum had formed.</p><p> Regarding the obturating ability of the apical area, because it did not remove the smear layer in this case of cleaning, a smear layer of average thickness of 3.15 μm existed between the canal wall and OGS. However, in the portion, the OGS adapted directly to the canal wall without interposition of the smear layer and showed superior obturating ability.</p><p> However, as for the OGS, it is thought that the component of OGS is replaced by hard tissue as substitution materials because absorption image was observed in the entire apical area and no Zn existed in the OGS of the absorption process. These results suggest that in an infected root canal caused by endodontic lesion, filling by thermoplasticized obturation of OGS to the apical foramen is required.</p>
収録刊行物
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- 日本歯内療法学会雑誌
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日本歯内療法学会雑誌 30 (3), 147-157, 2009
一般社団法人 日本歯内療法学会
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詳細情報
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- CRID
- 1390001205189439360
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- NII論文ID
- 10025695444
- 130006233530
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- NII書誌ID
- AA11837117
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- ISSN
- 24239429
- 13478672
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- CiNii Articles
- KAKEN
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- 抄録ライセンスフラグ
- 使用不可