air pressure problem dentalscanner focus rangefirmware update solutionsDEXIS scanner degradationGendex X-ray maintenance calibrationendodontic handpiece maintenancetransducer frequency testingemergency handpiece repair BCFast 3D Printer Repairshippingpatient comfort scalingscanner connectivity problemsKaVo NOMAD battery replacementexposure calibrationtroubleshoot DEXIS intraoral X-ray
