| 3092 Remaining Tooth Structure Associated with Restorative Approaches for Root-filled Premolars | ||
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L.L. SEOW1, C.G. TOH1, and N. WILSON2, 1University of Malaya, Kuala Lumpur, Malaysia, 2GKT Dental Institute, London, United Kingdom The amount of sound tooth structure that will remain following root canal therapy and any subsequent preparation is an important factor to consider in planning the treatment of endodontically treated teeth. Objectives: The purpose of the present study was to investigate the amount of sound tooth structure remaining following various tooth preparation designs to restore the endodontically treated maxillary second premolars. Methods: Illustrations of a maxillary second premolar in buccopalatal, mesiodistal and occlusal sections were drawn to scale according to Wheeler's Atlas of Tooth Form. It was assumed that the tooth had a pre-existing moderate-sized mesio-occlusal-distal (MOD) amalgam restoration and had undergone root canal treatment. Intracoronal (inlay, inlay with palatal cusp coverage and onlay) and extracoronal (metal-ceramic and all-ceramic) restorations were superimposed on the illustrations to reveal the amount of tooth tissue remaining in each case. Results: The ceramic inlay, inlay with palatal cusp coverage and onlay cavity preparations left approximately 2.0-2.5mm of sound tooth structure buccally and palatally. Following preparation for a metal-ceramic crown, approximately 1.0mm of sound tooth structure was found to be left buccally with 1.6mm-1.8mm of tooth structure palatally, except mesiopalatally where less than 1.0mm of tooth structure remained. If an all-ceramic crown were to be provided, approximately 1.0mm of tooth structure will remain; however, at the mesio-palatal corner, a mere 0.3mm of tooth structure may be found to be present. Conclusion: A substantial amount of coronal tooth tissue may be found to remain when the endodontically treated maxillary second premolar is restored with either a ceramic inlay or onlay. In contrast, very little coronal tooth tissue may remain following preparation of the same tooth for a metal-ceramic or all-ceramic crown. The findings are considered to have implications in the development of existing approaches to the restoration of endodontically treated teeth. | ||
| Seq #334 - Restoration of Endodontically Treated Teeth 10:15 AM-11:30 AM, Saturday, 13 March 2004 Hawaii Convention Center Exhibit Hall 1-2 | ||
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