dental sensor end-of-lifesensor housing restorationUltrasonic tip installationsensor sensitivityscanner focus systemdental X-ray sensor calibration GendexCAD CAM system maintenanceMedfusion 3500 case studyDEXIS intraoral calibration guidepreventive servicing supportintermittent failurenot detected troubleshootingdigital radiography DEXIS failurefiber connector contaminationimaging accuracy
