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Higher Voltage Influence on Optimal Caries Diagnosis in Digital Radiography
Umeå University, Faculty of Medicine, Department of Odontology, School of Dentistry.
2014 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

It has previously been shown that caries diagnostics is improved when performed on radiographs exposed with a voltage of 60 kV compared to 70 kV. This is because low voltage provides higher subject contrast.

The aim of the present study was to investigate whether the tube voltage used when exposing bitewings, influence the possibility to diagnose caries when using a new digital system with CMOS-sensors.

Extracted teeth were mounted and bitewings exposed with both 60 and 70 kV and varying exposure times, using a digital system with CMOS-sensors. Observers with different experience in dentistry evaluated the radiographs for caries. CBCT of each single tooth was used as golden standard.

There was no significant difference between the results of diagnosing caries between radiographs exposed with 60 kV compared to 70 kV. All radiographs that were exposed to an acceptable level of brightness gave similar result, independent on voltage.

In conclusion; there was no significant difference between radiographic caries diagnosis performed with radiographs exposed with 60 compared to 70 kV, given that the exposure time was optimized. This indicates that 70 kV can be used for all intraoral examination if a correct decreased exposure time is used and that lowering to 60 kV is not necessary when intraoral examinations for caries evaluation are performed.

Place, publisher, year, edition, pages
National Category
Medical and Health Sciences
URN: urn:nbn:se:umu:diva-98886OAI: diva2:783853
Educational program
Dentistry Programme
Available from: 2015-03-11 Created: 2015-01-27 Last updated: 2015-03-11Bibliographically approved

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