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KMID : 0354619940060010025
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Journal Dankook Dental Research Institute
1994 Volume.6 No. 1 p.25 ~ p.35
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AN EXPERIMENTAL STUDY OF A NEW ELECTRONIC APEX LOCATER(ROOT ZX) IN VIVO AND IN VIRTO UNDER DIFFERENT CONDITIONS
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Abstract
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The technique of electronic working length determination has gained considerable popularity among both endodontists and general dentist. Recently, the Root ZX(J.Morita Corp.,Tokyo, Japan) has been developed with unique electronic features that are claimed to maintain the instrument´s accuracy regardless of canal condition. The purpose of this study is to compare the accuracy of the Root ZX wirh estimates of actual canal length. in vitro model and in vivo under the various condition.
1. The experiment in vitro model
50 extracted, single-rooted and single-canaled, teeth with mature apices were selected. The extirpated teeth were placed in a saline-soaked Oasis, and measured with Root ZX according to manufacturer´s instruction in the dried canal and saline-irrigated canal. The teeth were then removed from the model and the actual canal length was measured. The values of canal length in each conditions were used for evaluating the results.
2. In vivo study
15 teeth which destined for extractfon were selected.· Once access was gained, the canals were irrigated using 5.25% sodium hypochlorite and were not dried prior´to insertion of the measurement file. Once the Root ZX indicated the C-D junction, self-curing resin was injected into the canal. The tooth was extracted and ground with a bur and Soflex disk. This was done until the terminus of the file and the root was revealed. The distance from the end of the file to the foramen(major diameter) was measure, and evaluated.
The results were as follows:
1. In vitro study(A/B: difference between A and B)
1). The mean values of acutal lengh/dried canal length and actual length/saline irrigated canal length were 0.528mm, and 0.525mm respectively. There is no signiffcant difference between the means of acutal length/dried canal length and acfual length/saline irrigated canal length.
2). Root ZX could locate the C-D junction at the point of 0.5mm inside of major foramen,in both dride canal and saline-irrigated canal.
2. In vivo study
1). Root ZX could locate the the C-D junction at the point of 0.5mm coronal to the major foramen in presence of 5.25% NaOCl.
2). Root Zx located a point that was perceived to be apical constriction. The majority of file tip experimented were within the canal,not extended beyond the major foramen.
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