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Rectangular collimation and radiographic efficacy in eight general dental practices in the West Midlands
Peter H Thornley1, Dominic A Stewardson, P G John Rout
1pthornley@blueyonder.co.uk
Summary
Rectangular collimation in dental radiography may increase retakes by 7%, but ultimately reduces patient radiation dosage. This study investigated the impact of collimator use on radiation exposure and image quality.
Area of Science:
- Dental Radiology
- Radiation Protection
Background:
- Rectangular collimation is advised to minimize patient radiation doses.
- Concerns exist that it may increase retake rates, potentially negating dose reduction benefits.
Purpose of the Study:
- To evaluate the effect of rectangular collimation on retake rates and overall patient radiation dosage in dental radiography.
- To assess changes in radiographic positioning and film quality following the implementation of rectangular collimators.
Main Methods:
- Eight general dental practitioners participated, taking 25 pairs of bitewing radiographs before and after fitting rectangular collimators.
- Duplicate films were assessed by an oral radiologist using the National Radiographic Protection Board (NRPB) grading system for quality and positioning.
Main Results:
- Initial positioning quality was acceptable for most dentists but declined for six after using rectangular collimation.
- General film quality was initially lower and varied in response to rectangular collimation among practitioners.
Conclusions:
- Despite a 7% increase in retakes among participating dentists, rectangular collimation is concluded to result in a net reduction in patient radiation dosage.
- The findings support the use of rectangular collimation for radiation dose reduction in dental radiography.