Dose reduction of two digital sensor systems measuring file lengths |
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| Affiliation: | 1. Department of Oral Radiology, Academic Center for Dentistry Amsterdam, Amsterdam, The Netherlands;2. Department of Oral Radiology, Academic Center for Dentistry Amsterdam, Amsterdam, The Netherlands;1. Division of Endodontics, Department of Oral Biological and Medical Sciences, Faculty of Dentistry, University of British Columbia, Vancouver, British Columbia, Canada;2. Department of Conservative Dentistry and Endodontics, Guanghua School of Stomatology, Sun Yat-Sen University, Guangzhou, China;3. Department of Restorative Dentistry and Endodontology, Osaka University Graduate School of Dentistry, Osaka, Japan;1. Department of Chemistry, Faculty of Science and Technology, Thammasat University, Pathumthani 12120, Thailand;2. Department of Chemical Technology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand;3. Department of Chemical Engineering, Rajamangala University of Technology Thanyaburi, Pathumtani 12110 Thailand;4. Faculty of Chemical and Natural Resources Engineering, Universiti Malaysia Pahang, Lebuhraya Tun Razak, Gambang, 26300 Pahang, Malaysia;5. Institute of Regional Innovation, Hirosaki University, Aomori 030-0813, Japan;1. Iranian Center For Endodontic Research, Research Institute of Dental Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran;2. Division of Endodontics, School of Dentistry, University of Maryland Baltimore, Baltimore, Maryland;1. State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace Engineering, Xi''an Jiaotong University, Xi''an, PR China;2. Clinical Research Center of Shaanxi Province for Dental and Maxillofacial diseases, College of Stomatology, Xi''an Jiaotong University, Xi''an, PR China;3. Tianjin First Center Hospital, Tianjin, PR China;4. Department of Mechanics, School of Aerospace Engineering, Beijing Institute of Technology, Beijing, PR China;1. Department of Endodontics, School of Dentistry, Grande Rio University (UNIGRANRIO), Rio de Janeiro, Rio de Janeiro, Brazil;2. Department of Endodontics, Rio de Janeiro State University (UERJ), Rio de Janeiro, Rio de Janeiro, Brazil;3. Department of Restorative Dentistry II, Federal University of Maranhão, São Luis, Maranhão, Brazil;1. Division of Endodontics, Department of Oral Biological and Medical Sciences, Faculty of Dentistry, The University of British Columbia, Vancouver, Canada;2. Department of Materials Engineering, Faculty of Applied Science, The University of British Columbia, Vancouver, Canada;3. Department of Stomatology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China |
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| Abstract: | ObjectivesThe aim of this study was to determine the effect of dose reduction on the image quality of two sensor systems with automatic greyscale adjustment.Study designsTwo digital sensor systems, Sidexis (Siemens, Bensheim, Germany) and Digora (Soredex, Helsinki, Finland), were tested. The image quality of the systems was determined by comparing lengths of endodontic files (025, 020, 015, and 010 files) and a premolar root in the digital images with lengths on conventional radiographic films. For the experiments the exposure was changed to 100%, 50%, 25%, 12.5%, 6.25%, and 3.125% of that for Ektaspeed films.ResultsThe lengths of 025 and 020 files and the premolar root in the digital images were comparable with the lengths on films even if the exposure was reduced to 6% of that used for Ektaspeed films. The lengths of 015 files reduced as the exposure was reduced. The lengths of 010 files were significantly shorter than the lengths on films.ConclusionsWith the systems tested, a dose reduction of approximately 95% compared with Ektaspeed films is possible to determine the lengths of a premolar root and 025 and 020 files. For thinner objects a dose reduction is questionable. |
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