title: The use and maintenance of visible light activating units in general practice.
abstract: OBJECTIVE
  The present study to investigate the use, care and maintenance of light units in everyday clinical practice was undertaken to complement light unit emission surveys, with a view to developing a protocol for light unit use and care in everyday clinical practice.
  
  
  METHODS
  The investigative work comprised a survey of selected practices in the Blackburn area with follow-up practice visits to examine light units in situ, and to glean additional information in respect of light unit use and care in the practice environment.
  
  
  RESULTS
  Completed questionnaires were returned by 54 of 77 selected practices--a 70% response, including information in relation to 164 light units. Subsequently, 100 (61%) of these light units were examined in 42 practices according to a standardised protocol. The use and care of the light units included in the study was found to be very variable. In addition to finding that 28 (28%) had inadequate light output (<300 mW/cm2), many of the light units were found to be damaged or repaired (47, 47%). Thirty five (35%) of the light units inspected were found to have varying amounts of material adherent to the light guide exit portal.
  
  
  CONCLUSIONS
  It is concluded that practitioners should address practical aspects of their increasing reliance on light units, and to this end, guidance is offered on visible light curing and the care and maintenance of light units.
authors.affiliation: Unit of Operative Dentistry and Endodontology, University Dental Hospital of Manchester.
authors.forename: B A
authors.initials: BA
authors.lastname: Mitton
authors.forename: N H
authors.initials: NH
authors.lastname: Wilson
mesh_terms: D003748:Dental Equipment; D003764:Dental Materials; D005260:Female; D006801:Humans; D008027:Light; D008283:Maintenance; D008297:Male; D011795:Surveys and Questionnaires; D013674:Technology, Dental / Q000295:instrumentation*
chemical_list: D003764:Dental Materials