Basic Investigation of the Methods for Removing Cast Posts : Comparison of Standard and Improved Types of Post and Core Remover

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  • 鋳造ポストの除去方法に関する基礎的検討 : 従来型ポストコアリムーバーと改良型ポストコアリムーバーの比較

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Abstract

The removal of cast posts is difficult and involves risks (root fracture), so it is necessary to remove cast posts speedily, surely and safely (3S). This study basically investigated the methods of removing cast posts which might attain the 3S easily by comparing two kinds of post and core remover (PR, YDM). The subjects were 32 human extracted teeth with cemented metal post and core (cast post). The group in which cast posts were removed by standard-type PR was defined as Group R, while the group in which cast posts were removed by improved-type PR was defined as Group RS. The cast posts were removed by one of the following methods. The tooth was grooved at two locations, one on the buccal side and the other on the lingual side, on the metal core margin by a #1970 carbide bar for FG, then the two tips of PR were inserted into these locations and the cast post was slowly removed by gently clasping force of the PR. We evaluated the time taken to remove the cast post, the length of the post portion, and the existence of a root fracture line by the coloring matter flooding test. Almost all the cast posts were removed within 5 minutes [Group R: 16/16, Group RS: 16/16 (unit: piece)]. The average time taken to remove the cast post was 120±70 (Group R), and 103±76 (Group RS) (unit: second); the removing time in Group RS was a little shorter than that in Group R, and the removal time classified by PR was not significantly different (Mann-Whitney U test, p≧0.05). The average length of these post portions was 6.1±1.5mm (Group R), and 6.1±1.4mm (Group RS); the post portion length of the removed cast posts was not significantly different (Mann-Whitney U test, p≧0.05). Using a #1970 narrow carbide bar for FG decreases tooth matter only minimally. Furthermore, the coloring matter flooding test showed that using the PR for removing cast posts is unlikely to cause vertical root fracture after removal. These results suggested that cast posts might be removed speedily, surely and safely (3S). In addition, the improved-type PR was slightly faster than the standard-type PR.

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