preventive dental equipment carestudent equipment abusebeam centering dental xraydental model shrinkageKerr SybronEndo Apex Locator Repairchairside efficiencydigital X-ray fixsensor connector fixscanner hardware limitationsscanner optical failuretube lifespan optimisationmaintain dental X-ray sensorscanner cart power optimizationOwandy preventive maintenanceadhesion maintenance
