title: EFFECT OF LIGHT CURING UNIT CHARACTERISTICS ON LIGHT INTENSITY OUTPUT, DEPTH OF CURE AND SURFACE MICRO-HARDNESS OF DENTAL RESIN COMPOSITE.
abstract: BACKGROUND
  Modern dental composite restorations are wholly dependent on the use of Visible Light Curing devices. The characteristics of these devices may influence the quality of composite resin restorations.
  
  
  OBJECTIVE
  To determine the characteristics of light curing units (LCUs) in dental clinics in Nairobi and their effect on light intensity output, depth of cure (DOC) and surface micro-hardness (SMH) of dental resin composite.
  
  
  METHODS
  Laboratory based, cross-sectional analytical study.
  
  
  METHODS
  Public and private dental clinics in Nairobi, Kenya.
  
  
  METHODS
  Eighty three LCUs which were in use in private and public dental health facilities in Nairobi, Kenya and resin composite specimens.
  
  
  RESULTS
  Of the 83 LCUs studied, 43 (51.8%) were Light Emitting Diodes (LEDs) and 39(47.0%) were Quartz-Tungsten-Halogen (QTH) and 1 (1.2%) was Plasma Arc Curing (PAC) light. Mean light intensity for QTH and LED lights was 526.59 mW/cm2 and 493.67 mW/cm2 respectively (p=0.574), while the mean DOC for QTH lights was 1.71 mm and LED was 1.67 mm (p=0.690). Mean Vickers Hardness Number (VHN) for LED was 57.44 and for QTH was 44.14 (p=0.713). Mean light intensity for LCUs < or = 5 years was 596.03 mW/cm2 and 363.17 mW/cm2 for units > 5 years old (p=0.024). The mean DOC for the two age groups was 1.74 mm and 1.57 mm respectively (p=0.073). For SMH, the < or = 5 years and >5 years age groups gave a mean VHN of 58.81 and 51.46 respectively (p=0.1). On maintenance history, the frequency of routine inspection, duration since the last repair/replacement of a part or other maintenance activity and the nature of the last maintenance activity were determined and were not found to have influenced the light intensity, DOC and SMH.
  
  
  CONCLUSIONS
  The LCU age has a statistically significant influence on its light intensity (p=0.024) while the type and maintenance history have no significant influence on its light intensity and composite DOC and SMH (p=0.574, p=0.690, p=0.713 respectively).
authors: Department of Conservative and Prosthetic Dentistry, College of Health Sciences, University of Nairobi, PO Box 19676-00202, Nairobi, Kenya.
authors: B A
authors: BA
authors: Kassim
authors: B K
authors: BK
authors: Kisumbi
authors: W R
authors: WR
authors: Lesan
authors: L W
authors: LW
authors: Gathece
mesh_terms: D000180:Acrylic Resins / Q000528:radiation effects*; D003188:Composite Resins / Q000528:radiation effects*; D003430:Cross-Sectional Studies; D055117:Curing Lights, Dental; D004867:Equipment Design; D006244:Hardness; D006801:Humans; D007630:Kenya; D011140:Polyurethanes / Q000528:radiation effects*; D013499:Surface Properties
chemical_list: D000180:Acrylic Resins; C029012:Composite Dental Resin; D003188:Composite Resins; D011140:Polyurethanes