Thesis
The accuracy of post and core fabricated with digital technology
University of Iowa
Master of Science (MS), University of Iowa
Spring 2021
DOI: 10.17077/etd.006042
Abstract
Objectives: The purpose of this research is to compare the accuracy of post and core created with three different fabricating techniques; direct conventional, machine milling and three dimensional printing.Methods: Thirteen extracted single root central incisors were selected. Root canal treatment and tooth preparation for a crown were performed on all teeth. Post space preparation of 11 mm using prefabricated fiber post drill was used to standardize post space width and length. Root canal was impressed using polyvinyl siloxane impression material. The impression was then three dimensionally scanned using extraoral lab scanner. The scanned impressions were used to design post and cores with 3shape CAD software. The designed posts were used to 3D print and mill post and core resin patterns. The same teeth were used to fabricate post and core with conventional technique (direct duplication of root canal with pattern resin). All posts were then scanned before invested and cast using base metal educational alloy. The metal post and cores were tried in with sample teeth and adjusted until found to be clinically acceptable. The metal post and cores were scanned to perform digital measurement using Geomagic X software to determine accuracy.
Results: The metal post and core fabricated with three different techniques showed no statistical different in accuracy. One of 36 post and cores was found to be clinically unacceptable. The accuracy of 3D printed resin pattern was fond to be inferior compare to milled resin pattern. However, dimensional stability of the 3D printed resin patter before and after casting was found to be superior to milling resin pattern and direct resin pattern. All three techniques showed significant volume reduction after adjustment.
Conclusion: These findings revealed that digitally fabricated post and core has the same degree of accuracy as the gold standard direct conventional post and core fabrication technique.
Details
- Title: Subtitle
- The accuracy of post and core fabricated with digital technology
- Creators
- Tarin Piangsuk
- Contributors
- Terry J Lindquist (Advisor)Tarek El Kerdani (Committee Member)Deborah V. Dawson (Committee Member)
- Resource Type
- Thesis
- Degree Awarded
- Master of Science (MS), University of Iowa
- Degree in
- Oral Science
- Date degree season
- Spring 2021
- DOI
- 10.17077/etd.006042
- Publisher
- University of Iowa
- Number of pages
- ix, 62 pages
- Copyright
- Copyright 2021 Tarin Piangsuk
- Language
- English
- Description illustrations
- color illustrations
- Description bibliographic
- Includes bibliographical references (pages 54-62).
- Public Abstract (ETD)
This study investigated the accuracy of post and core used in restoring teeth after root canal treatment is done. Post and core helps retain the crown when a tooth is severely damaged after root canal treatment is done. The gold standard that has been used is a direct technique which is created by duplicating the root canal with resin material. The development of digital technology has made new way of creating post and core possible. However, no research has looked at the accuracy of this novel digital post and core fabrication method. This research used thirteen front teeth as samples to fabricated post and cores. Three post and cores fabricated with different techniques, direct technique, 3D printing, and machine milling, were created. Each post and core was then tried back in the tooth to see how they fit to the tooth and an accuracy measurement was done using digital software called Geomagic X software.
The result showed that there was no statistical difference in the accuracy of post and core fabricated with three different techniques, direct technique, 3D printing and machine milling. It can be concluded that digitally fabricated post and core fit the tooth the same as the gold standard direct conventional post and core fabrication technique
- Academic Unit
- Oral Pathology, Radiology and Medicine
- Record Identifier
- 9984096976102771
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