The flow of the guttapercha during vertical compaction of warm guttapercha with emphasis in accessory canals
Date
1984
DOI
Authors
Fasja, Moises
Version
OA Version
Citation
Abstract
The purpose of this study was to investigate in vitro and in vivo the flow of the guttapercha into the accessory canals and its adaptation to the dentinal walls of the root canal when vertical compaction of warm guttapercha is used, with and without sealer.
The in vitro study consisted in cleaning and shaping of the root canal system of extracted human roots. All different types of anterior and posterior roots were used. The main apical foramen of each root canal was sealed with sticky wax. An Erlenmeyer flask was then set up, so that a continuous vaccum existed inside. A rubber stopper was adapted, in a way that a tooth could be placed through the stopper leaving the access cavity outside the flask, and the rest of the tooth would be within the vaccum in the flask, and visible. A drop of methylene blue dye was placed into the access cavity, and the vaccum was then turned on. The dye was then drawn through any accessory canals that existed, creating blue spots along the root where the accessory canals were present. From the roots that showed accessory canals, 3O were randomly chosen to be obturated by the vertical compaction of warm gutta-percha with and without sealer.
The in vivo study consisted in cleaning, shaping and filling of the root canal system of teeth that needed to be extracted for periedontal or orthodontic reasons and those who needed hemisections or root amputations. The root canal systems were obturated using the vertical compaction of warm gutta-percha with and without sealer. After completion of the endodontic therapy and during periodontal procedures the roots were extracted.
The in vitro and in vivo specimens were observed by means of the clearing technique and electron microscope.
The following conclusions were drawn:
1. When vertical compaction of warm guttapercha is used guttapercha flows into the accessory canals most of the times.
2. Guttapercha flowed into 99% of the accessory canals previously identified with the use of methylene blue dye, when no sealer was used.
3. 100% of the accessory canals were filled with gutta-percha and sealer when vertical compaction of warm guttapercha was used in conjunction with Kerr sealer.
4. A microfilm of cement is desirable to obtain a complete hermetic three-dimensional obturation of the root canal system.
5. Guttapercha has the rheological ability to flow into accessory canals and irregularities of the root canal system, when subjected to the vertical compaction of warm guttapercha.
6. Cleaning and shaping of the canals is the most important phase of endodontic treatment.
7. A continuous tapering funnel shape of the root canal system is essential to obtain the proper flow of the guttapercha.
8. Parallel shapes of the root canal system will lead to poor condensation of the guttapercha.
Description
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Thesis (M.Sc.D.)--Boston University, Henry M. Goldman School of Graduate Dentistry, 1984, (Endodontics)
Bibliography: leaves 191-208.
Thesis (M.Sc.D.)--Boston University, Henry M. Goldman School of Graduate Dentistry, 1984, (Endodontics)
Bibliography: leaves 191-208.
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This work is protected by copyright. Downloading is restricted to the BU community. If you are the author of this work and would like to make it publicly available, please contact open-help@bu.edu.