Document Detail

Planning implants crown down--a systematic quality control for proof of concept.
MedLine Citation:
PMID:  20971374     Owner:  NLM     Status:  MEDLINE    
PURPOSE: We evaluated an innovative approach for conventional surgical or transmucosal implantation applying backward planning with bone oriented crown down implant positions, followed by immediate restoration.
MATERIALS AND METHODS: Our workflow combined computer-assisted preoperative planning with the well-known intraoperative handling of surgical templates. To guarantee optimal accuracy, the complete process was bone borne, not soft tissue borne. Furthermore, in this concept, the definite prosthesis was manufactured on a plaster cast and fixed with technical implants inserted into the model using the same drilling template applied for intraoperative guidance of the drill. This bone-based workflow avoids the accumulation of errors throughout all steps of the treatment. In the present study, we have provided a concise quantitative quality control using 4 in vivo implants. This goal was accomplished by image matching of the preoperative plan with the corresponding postoperative computed tomography scan, applying descriptive statistics, the 1-sample t test, and the Student t test.
RESULTS: Statistical evaluation showed that the bone-borne drilling template provides sufficient accuracy for immediate restoration with the definite prosthesis at the end of the operation. Deviation in the apex plane was 0.8 ± 0.42 mm, with 0.33 at the maximum. The angular deviation was 3.18° ± 0.78°.
CONCLUSIONS: Our workflow is a promising approach with respect to handling, accuracy, and intraoperative safety.
Rolf Ewers; Rudolf Seemann; Gerald Krennmair; Kurt Schicho; Ayman Omar Kurdi; Axel Kirsch; Astrid Reichwein
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of oral and maxillofacial surgery : official journal of the American Association of Oral and Maxillofacial Surgeons     Volume:  68     ISSN:  1531-5053     ISO Abbreviation:  J. Oral Maxillofac. Surg.     Publication Date:  2010 Nov 
Date Detail:
Created Date:  2010-10-25     Completed Date:  2010-12-08     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8206428     Medline TA:  J Oral Maxillofac Surg     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2868-78     Citation Subset:  AIM; D; IM    
Copyright Information:
Copyright © 2010 American Association of Oral and Maxillofacial Surgeons. Published by Elsevier Inc. All rights reserved.
University Clinic of Maxillofacial Surgery, Medical University of Vienna, Vienna, Austria.
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MeSH Terms
Dental Abutments
Dental Implantation, Endosseous / instrumentation,  methods*,  standards
Dental Implants* / standards
Dental Models
Dental Prosthesis Design* / standards
Dental Prosthesis, Implant-Supported
Image Processing, Computer-Assisted
Intraoperative Care / instrumentation
Patient Care Planning* / standards
Quality Control
Tomography, X-Ray Computed
Reg. No./Substance:
0/Dental Implants

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