Röntgen

Dr. Sven Schubert
Zwickau
Implantologie Journal 07 2011, 27.09.2011

Mit der Gründung meiner Praxis im Jahre 1994 habe ich mir die Prämisse gesetzt, durch die Investition in innovative Geräte und Behandlungsmethoden für meine Patienten und mich eine Verbesserung der Behandlungsabläufe und somit auch der Behandlungsqualität zu erreichen. Der Schwerpunkt unserer Praxistätigkeit liegt dabei im Erhalt und der vollständigen Wiederherstellung des orofazialen Systems mittels Implantologie, Endo dontie, Laserzahnheilkunde und CAD/CAM-gefertigten Zahnersatz. Zur Erreichung dieser Ziele ist eine optimale Diagnostik unerlässlich.

© 2011 Oemus Media AG

Dr. Sven Schubert
Zwickau
Implantologie Journal 07 2011, 27.09.2011

Mit der Gründung meiner Praxis im Jahre 1994 habe ich mir die Prämisse gesetzt, durch die Investition in innovative Geräte und Behandlungsmethoden für meine Patienten und mich eine Verbesserung der Behandlungsabläufe und somit auch der Behandlungsqualität zu erreichen. Der Schwerpunkt unserer Praxistätigkeit liegt dabei im Erhalt und der vollständigen Wiederherstellung des orofazialen Systems mittels Implantologie, Endo dontie, Laserzahnheilkunde und CAD/CAM-gefertigten Zahnersatz. Zur Erreichung dieser Ziele ist eine optimale Diagnostik unerlässlich.

© 2011 Oemus Media AG

Dr. Bernd Fleischer
Ulm
Zahnarzt Wirtschaft Praxis 05 / 2011, 21.06.2011

Will man als Zahnarzt ein intraorales Röntgensystem kaufen, stellt sich mittlerweile nicht mehr die Frage, ob analog oder digital. Die heute auf dem Markt befindlichen digitalen Systeme sind dem analogen Zahnfilm derart überlegen, dass man sich bei einer Neuanschaffung immer für das digitale Röntgen entscheiden wird.

© 2011 Oemus Media AG

Dr. Bernd Fleischer
Ulm
Zahnarzt Wirtschaft Praxis 05 / 2011, 21.06.2011

Will man als Zahnarzt ein intraorales Röntgensystem kaufen, stellt sich mittlerweile nicht mehr die Frage, ob analog oder digital. Die heute auf dem Markt befindlichen digitalen Systeme sind dem analogen Zahnfilm derart überlegen, dass man sich bei einer Neuanschaffung immer für das digitale Röntgen entscheiden wird.

© 2011 Oemus Media AG

Dr. Carsten Stockleben
Hannover
Dentalzeitung 02/2011, 04.05.2011

Die digitale Volumentomografie (DVT) findet zunehmend Einzug in die zahnärztliche Praxis. Üblicherweise denken wir zuerst an das Einsatzgebiet Implantologie und dann vielleicht noch an die Oralchirurgie, wenn das Stichwort DVT fällt. Viele Kollegen winken mit den Worten „Das ist nichts für mich. Das ist nicht mein Interessengebiet, mir fehlt die Indikation“ ab. Dabei ist es gerade das breite Indikationsspektrum, welches

© 2011 Oemus Media AG

Dr. Carsten Stockleben
Hannover
Dentalzeitung 02/2011, 04.05.2011

Die digitale Volumentomografie (DVT) findet zunehmend Einzug in die zahnärztliche Praxis. Üblicherweise denken wir zuerst an das Einsatzgebiet Implantologie und dann vielleicht noch an die Oralchirurgie, wenn das Stichwort DVT fällt. Viele Kollegen winken mit den Worten „Das ist nichts für mich. Das ist nicht mein Interessengebiet, mir fehlt die Indikation“ ab. Dabei ist es gerade das breite Indikationsspektrum, welches diese faszinierende Technologie auszeichnet, denn die dritte Dimension im Röntgenbild ist ein wahrer Quantensprung in der Qualität der zahnärztlichen Diagnostik. Dieser Artikel zeigt die vielen Indikationen, Vorteile und Zukunftsperspektiven der digitalen Volumentomografie.

© 2011 Oemus Media AG

Ludlow, John B.; DDS, MS, FDS RCSEd
Department of Diagnostic Sciences, University of North Carolina School of Dentistry, Chapel Hill, North Carolina, USA
25.04.2011

Background: Use of ionizing radiation in diagnostic medical examinations has increased over the last 20 years to the point where the annual per capita dose to the US population from all sources has doubled. Aims: The purpose of this study is to document dose and to estimate risk resulting from various combinations of field size and location that would be encountered with typical use of the OP300.

Ludlow, John B.; DDS, MS, FDS RCSEd
Department of Diagnostic Sciences, University of North Carolina School of Dentistry, Chapel Hill, North Carolina, USA
25.04.2011

Background: Use of ionizing radiation in diagnostic medical examinations has increased over the last 20 years to the point where the annual per capita dose to the US population from all sources has doubled. Aims: The purpose of this study is to document dose and to estimate risk resulting from various combinations of field size and location that would be encountered with typical use of the OP300. Approach: A human equivalent phantom with optically stimulated luminescent dosimeters (OSLD) will be used to assess panoramic and volumetric examinations produced by the OP300 dental panoramic and CBCT unit. Reporting of this information will be useful for practitioner/ facilities purchasing decisions and in counseling of patients. Materials and Methods: Optically stimulated luminescent dosimeters (Nanodot, Landauer, Inc., Glenwood, IL) are plastic disks infused with aluminum oxide doped with carbon (Al2O3:C). The trace amounts of Carbon in the Al2O3 crystal lattice create imperfections that act as traps (F centers) for electrons or holes. After exposure to ionizing radiation, free electrons and holes are generated and trapped at the F centers in proportion to the amount of energy in the exposure. Results: Effect dose for a small adult panoramic image made at 70kVp and 10 mA during a 16 second scan was 20 μSv. A small adult lateral cephalometric image produced an effective dose of 7 μSv.

Damstra J, Fourie Z, Huddleston Slater JJ, Ren Y
Department of Orthodontics, University Medical Center Groningen, University of Groningen, PO Box 30.001, Groningen, 9700 RB, The Netherlands
Am J Orthod Dentofacial Orthop. 2010 Jan;137(1):16.e1-6; discussion 16-7, 01.01.2010

The aims of this study were to determine the linear accuracy of 3-dimensional surface models derived from a commercially available cone-beam computed tomography (CBCT) dental imaging system and volumetric rendering software and to investigate the influence of voxel resolution on the linear accuracy of CBCT surface models.

© PMID: 20122425 [PubMed]

Damstra J, Fourie Z, Huddleston Slater JJ, Ren Y
Department of Orthodontics, University Medical Center Groningen, University of Groningen, PO Box 30.001, Groningen, 9700 RB, The Netherlands
Am J Orthod Dentofacial Orthop. 2010 Jan;137(1):16.e1-6; discussion 16-7, 01.01.2010

INTRODUCTION: The aims of this study were to determine the linear accuracy of 3-dimensional surface models derived from a commercially available cone-beam computed tomography (CBCT) dental imaging system and volumetric rendering software and to investigate the influence of voxel resolution on the linear accuracy of CBCT surface models. METHODS: Glass sphere markers were fixed on 10 dry mandibles. The mandibles were scanned with 0.40 and 0.25 voxel size resolutions in 3 sessions. Anatomic truth was established with 6 direct digital caliper measurements. The surface models were rendered by a volumetric rendering program, and the CBCT measurements were established as the mean of the 3 measurements. RESULTS: The intraclass correlation coefficients between the physical measurements and the measurements of the CBCT images of 0.40 and 0.25 voxels were all more than 0.99. All CBCT measurements were accurate. There was no difference between the accuracy of the measurements between the 0.40 and 0.25 voxel size groups. The smallest detectable differences of the CBCT measurements were minimal, confirming the accuracy of the CBCT measurement procedure. CONCLUSIONS: The measurements on 3-dimensional surface models of 0.25 and 0.40 voxel size data sets made with the 3D eXam CBCT scanner (KaVo Dental GmbH, Bismarckring, Germany) and SimPlant Ortho Pro software (version 2.00, Materialise Dental, Leuven, Belgium) are accurate compared with direct caliper measurements. An increased voxel resolution did not result in greater accuracy of the surface model measurments.

© PMID: 20122425 [PubMed]

Hassan B, Metska ME, Ozok AR, van der Stelt P, Wesselink PR
Department of Oral and Maxillofacial Radiology, Academic Centre for Dentistry Amsterdam, Amsterdam, The Netherlands
J Endod. 2010 Jan;36(1):126-9, 01.01.2010

This study compared the accuracy of cone beam computed tomography (CBCT) scans made by five different systems in detecting vertical root fractures (VRFs). It also assessed the influence of the presence of root canal filling (RCF), CBCT slice orientation selection, and the type of tooth (premolar/molar) on detection accuracy.

© PMID: 20003950 [PubMed - indexed for MEDLINE]

Hassan B, Metska ME, Ozok AR, van der Stelt P, Wesselink PR
Department of Oral and Maxillofacial Radiology, Academic Centre for Dentistry Amsterdam, Amsterdam, The Netherlands
J Endod. 2010 Jan;36(1):126-9, 01.01.2010

INTRODUCTION: This study compared the accuracy of cone beam computed tomography (CBCT) scans made by five different systems in detecting vertical root fractures (VRFs). It also assessed the influence of the presence of root canal filling (RCF), CBCT slice orientation selection, and the type of tooth (premolar/molar) on detection accuracy. METHODS: Eighty endodontically prepared teeth were divided into four groups and placed in dry mandibles. The teeth in groups Fr-F and Fr-NF were artificially fractured; those in groups control-F and control-NF were not. Groups Fr-F and control-F were root filled. CBCT scans were made using five different commercial CBCT systems. Two observers evaluated images in axial, coronal, and sagittal reconstruction planes. RESULTS: There was a significant difference in detection accuracy among the five systems (p = 0.00001). The presence of RCF did not influence sensitivity (p = 0.16), but it reduced specificity (p = 0.003). Axial slices were significantly more accurate than sagittal and coronal slices (p = 0.0001) in detecting VRF in all systems. Significantly more VRFs were detected among molars than premolars (p = 0.0001). CONCLUSIONS: RCF presence reduced specificity in all systems (p = 0.003) but did not influence accuracy (p = 0.79) except in one system (p = 0.012). Axial slices were the most accurate in detecting VRFs (p = 0.0001).

© PMID: 20003950 [PubMed - indexed for MEDLINE]

Dr. Gisela Peters
Dental Magazin, 2009;28(6);545 , 01.01.2010

Der diagnostische Nutzen eines DVT-Gerätes liegt in der dreidimensionalen Darstellung der Bil-der. Ist es für niedergelassene Zahnärzte finanzierbar und wirtschaftlich, in der Praxis ein eigenes Gerät zu haben? Ein Bericht zu Kosten, Nutzen und Wirtschaftlichkeit.

© 2010 Deutscher Ärzte-Verlag

Dr. Gisela Peters
Dental Magazin, 2009;28(6);545 , 01.01.2010

Der diagnostische Nutzen eines DVT-Gerätes liegt in der dreidimensionalen Darstellung der Bil-der. Ist es für niedergelassene Zahnärzte finanzierbar und wirtschaftlich, in der Praxis ein eigenes Gerät zu haben? Ein Bericht zu Kosten, Nutzen und Wirtschaftlichkeit.

© 2010 Deutscher Ärzte-Verlag

Theodorakou C, Horner K, Howard K, Walker A
North Western Medical Physics, The Christie NHS Foundation Trust, School of Dentistry, University of Manchester, Manchester, United Kingdom
12.09.2009

Cone beam computed tomography (CBCT) is an x-ray emerging technology with wide applications in the dental and maxillofacial disciplines. Dental CBCT has been associated with higher radiation risk to the patients compared to conventional dental x-ray imaging.

World Congress on Medical Physics and Bioengineering, Munich, 7-12 September 2009 (Conference Paper and poster presentation)

Theodorakou C, Horner K, Howard K, Walker A
North Western Medical Physics, The Christie NHS Foundation Trust, School of Dentistry, University of Manchester, Manchester, United Kingdom
12.09.2009

Cone beam computed tomography (CBCT) is an x-ray emerging technology with wide applications in the dental and maxillofacial disciplines. Dental CBCT has been associated with higher radiation risk to the patients compared to conventional dental x-ray imaging. Several studies have investigated the radiation doses involved in dental CBCT for adults but none has looked into paediatric doses. This study estimates the organ and effective doses to two paediatric tissue-equivalent phantoms using thermoluminescent dosimeters for three dental CBCT units and six imaging protocols. The doses to the thyroid, salivary glands and brain ranged from 0.068mSv to 1.131mSv, 0.708mSv to 2.009mSv and 0.031mSv to 1.584mSv respectively. The skin and red bone marrow have received much lower doses than the other three organs. The effective doses ranged from 0.022 mSv to 0.081 mSv. The highest effective dose was calculated for the NewTom VG using the dental protocol and the lowest was observed for the Next Generation i-CAT using the 6cm maxilla protocol. The effective doses calculated in this study were much higher than these of panoramic x-ray imaging but lower than conventional CT.

World Congress on Medical Physics and Bioengineering, Munich, 7-12 September 2009 (Conference Paper and poster presentation)

Ludlow JB, Ivanovic M
Department of Diagnostic Sciences and General Dentistry, University of North Carolina School of Dentistry, Chapel Hill, North Carolina 27599-7450, USA
Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2008 Jul;106(1):106-14, 01.07.2008

This study compares 2 measures of effective dose, E(1990) and E(2007), for 8 dentoalveolar and maxillofacial cone-beam computerized tomography (CBCT) units and a 64-slice multidetector CT (MDCT) unit.

© PMID: 18504152 [PubMed - indexed for MEDLINE]

Ludlow JB, Ivanovic M
Department of Diagnostic Sciences and General Dentistry, University of North Carolina School of Dentistry, Chapel Hill, North Carolina 27599-7450, USA
Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2008 Jul;106(1):106-14, 01.07.2008

OBJECTIVES: This study compares 2 measures of effective dose, E(1990) and E(2007), for 8 dentoalveolar and maxillofacial cone-beam computerized tomography (CBCT) units and a 64-slice multidetector CT (MDCT) unit. STUDY DESIGN: Average tissue-absorbed dose, equivalent dose, and effective dose were calculated using thermoluminescent dosimeter chips in a radiation analog dosimetry phantom. Effective doses were derived using 1990 and the superseding 2007 International Commission on Radiological Protection (ICRP) recommendations. RESULTS: Large-field of view (FOV) CBCT E(2007) ranged from 68 to 1,073 microSv. Medium-FOV CBCT E(2007) ranged from 69 to 560 microSv, whereas a similar-FOV MDCT produced 860 microSv. The E(2007) calculations were 23% to 224% greater than E(1990). CONCLUSIONS: The 2007 recommendations of the ICRP, which include salivary glands, extrathoracic region, and oral mucosa in the calculation of effective dose, result in an upward reassessment of fatal cancer risk from oral and maxillofacial radiographic examinations. Dental CBCT can be recommended as a dose-sparing technique in comparison with alternative medical CT scans for common oral and maxillofacial radiographic imaging tasks.

© PMID: 18504152 [PubMed - indexed for MEDLINE]