Panoramic and cephalometric equipment should receive the same maintenance for decontamination and disinfection as other equipment. Panoramic bite-blocks, chin rest, and patient handgrips should be cleaned with detergent-iodine disinfectant and covered with a plastic bag. Disposable bite-blocks may be used. The head-positioning guides, control panel, and exposure switch should be carefully wiped with a paper towel that is well moistened with disinfectant. Note: disposable bite-blocks are the preferred method, although they may not be cost effective. Oral radiology ; White and Pharaoh 7th edition page no: 256
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