PMID- 14649615
OWN - NLM
STAT- MEDLINE
DCOM- 20040116
LR  - 20131121
IS  - 0164-1263 (Print)
IS  - 0164-1263 (Linking)
VI  - 25
IP  - 5
DP  - 2003 Sep-Oct
TI  - An in vitro study of enamel surface microhardness following argon laser 
      irradiation and acidulated phosphate fluoride treatment.
PG  - 497-500
AB  - PURPOSE: The purpose of this in vitro study was to evaluate the effect of 
      low-fluence argon laser (AL) irradiation and acidulated phosphate fluoride (APF) 
      gel treatment on enamel microhardness. METHODS: Twelve mandibular permanent 
      molars were selected for this study. The teeth were sectioned generating 4 flat 
      enamel surfaces per tooth. The flattened enamel tooth surfaces were randomly 
      assigned to 1 of 4 treatment groups: (1) no treatment (control); (2) the enamel 
      surface was exposed to a 4-minute, 1.23% APF gel treatment; (3) the enamel 
      surface was exposed to AL irradiation of 11.5 J/cm2 (0.23 1-W, 5-mm beam size, 10 
      seconds); and (4) the enamel surface was exposed to the same AL irradiation 
      followed by an APF gel treatment. Using a Buehler Micromet II Digital 
      Microhardness Tester, Knoop hardness was determined using a 1,000-gram load and a 
      dwell time of 12 seconds. Five hardness values were recorded for each enamel 
      surface. Data were analyzed using ANOVA and Fisher's least significant difference 
      post-hoc test. RESULTS: Mean surface hardness values (+/-SD) were 298+/-37 Knoop 
      hardness (HK) for the no treatment (control), 270+/-70 HK for the APF-only group, 
      316+/-5 HK for the AL-only group, and 317+/-25 HK for the AL-before-APF group. 
      The AL-only and AL-before-APF groups had significantly higher (P<.05) surface 
      hardness values vs the APF-only group. CONCLUSIONS: Enamel surface microhardness 
      is higher when exposed to low AL irradiation only or AL before APF vs a no 
      treatment (control) enamel surface.
FAU - Westerman, Gary H
AU  - Westerman GH
AD  - Department of Community and Preventive Dentistry, Creighton University, School of 
      Dentistry, Omaha, Neb, USA. ghwester@creighton.edu
FAU - Ellis, Randall W
AU  - Ellis RW
FAU - Latta, Mark A
AU  - Latta MA
FAU - Powell, G Lynn
AU  - Powell GL
LA  - eng
PT  - Clinical Trial
PT  - Journal Article
PT  - Randomized Controlled Trial
PL  - United States
TA  - Pediatr Dent
JT  - Pediatric dentistry
JID - 7909102
RN  - 0 (Cariostatic Agents)
RN  - 0 (Gels)
RN  - 39456-59-2 (Acidulated Phosphate Fluoride)
RN  - 67XQY1V3KH (Argon)
SB  - IM
MH  - Acidulated Phosphate Fluoride/*therapeutic use
MH  - Analysis of Variance
MH  - Argon
MH  - Cariostatic Agents/*therapeutic use
MH  - Dental Enamel/drug effects/radiation effects/*ultrastructure
MH  - Gels
MH  - Hardness
MH  - Humans
MH  - *Laser Therapy
MH  - Stress, Mechanical
EDAT- 2003/12/03 05:00
MHDA- 2004/01/17 05:00
CRDT- 2003/12/03 05:00
PHST- 2003/12/03 05:00 [pubmed]
PHST- 2004/01/17 05:00 [medline]
PHST- 2003/12/03 05:00 [entrez]
PST - ppublish
SO  - Pediatr Dent. 2003 Sep-Oct;25(5):497-500.