PMID- 20717709
OWN - NLM
STAT- MEDLINE
DCOM- 20110224
LR  - 20211020
IS  - 1573-4838 (Electronic)
IS  - 0957-4530 (Linking)
VI  - 21
IP  - 11
DP  - 2010 Nov
TI  - The effect of ultrasound on the setting reaction of zinc polycarboxylate cements.
PG  - 2901-5
LID - 10.1007/s10856-010-4146-x [doi]
AB  - The set of glass ionomer cement (GIC) is accelerated by application of 
      ultrasound. Although GIC has somewhat displaced zinc polycarboxylate cement (ZPC) 
      in dental applications the latter is still extensively used. Like GIC, it 
      provides direct adhesion to tooth and can provide F release, but is more 
      radiopaque and biocompatible than GIC. The aim of this study is to examine the 
      effect of ultrasound on the setting of ZPC using Fourier transform infra red 
      spectroscopy and any interaction with SnF(2) addition. ZPC with and without 
      SnF(2) addition (+/-S) at luting (L) 2:1 P/L ratio and restorative (R) 4:1 P/L 
      ratio consistencies. Ultrasound is applied to the cement using Piezon-Master 400, 
      EMS, Switzerland at 60 s from start of mixing for 15 s. The ratios of absorbance 
      peak height at 1,400 cm(-1) -COO(-) to that at 1,630 cm(-1) -COOH were measured 
      and compared those obtained for the cement not treated with US. These values were 
      taken at the elapsed time at which no further change in spectrum [ratio] was 
      observed at room temperature [10-20 min]. The US results are taken at 2 or 3 min. 
      No US: R/+S (1.09), R/-S (1.2), L/+S (1.07), L/-S (1.04); US: R/+S (1.50), R/-S 
      (1.64), L/+S (1.38), L/-S (1.05). The results show all four ZPC formulations are 
      very sensitive to ultrasound whether with or without SnF(2). Reducing US to 10 s 
      produces lower initial ratios but these increase up to 10 min when very high 
      ratios (>2) are obtained. Previous studies with restorative GICs found that 40-55 
      s US was needed to produce the effect found with 15 s on ZPCs. ZPC powder is more 
      basic than GIC glass; this may account for ZPC's greater sensitivity to US. 
      Ultrasound may provide a useful adjunct to the clinical use of ZPC both as luting 
      agent and temporary restorative.
FAU - Shahid, S
AU  - Shahid S
AD  - Department of Dental Physical Sciences, Barts and the London School of Medicine 
      and Dentistry, Queen Mary University of London, Francis Bancroft Building, Mile 
      End, London E1 4NS, UK. s.shahid@qmul.ac.uk
FAU - Billington, R W
AU  - Billington RW
FAU - Hill, R G
AU  - Hill RG
FAU - Pearson, G J
AU  - Pearson GJ
LA  - eng
PT  - Evaluation Study
PT  - Journal Article
DEP - 20100818
PL  - United States
TA  - J Mater Sci Mater Med
JT  - Journal of materials science. Materials in medicine
JID - 9013087
RN  - 0 (Cariostatic Agents)
RN  - 0 (Drug Carriers)
RN  - 0 (Polycarboxylate Cement)
RN  - 0 (Powders)
RN  - 0 (Tin Fluorides)
SB  - IM
MH  - Cariostatic Agents/administration & dosage/pharmacology
MH  - *Chemical Precipitation/drug effects
MH  - Dental Bonding/methods
MH  - Drug Carriers/chemistry
MH  - Materials Testing
MH  - Polycarboxylate Cement/*chemistry
MH  - Powders
MH  - Spectroscopy, Fourier Transform Infrared
MH  - Time Factors
MH  - Tin Fluorides/administration & dosage/pharmacology
MH  - Ultrasonics/*methods
EDAT- 2010/08/19 06:00
MHDA- 2011/02/25 06:00
CRDT- 2010/08/19 06:00
PHST- 2010/03/12 00:00 [received]
PHST- 2010/08/03 00:00 [accepted]
PHST- 2010/08/19 06:00 [entrez]
PHST- 2010/08/19 06:00 [pubmed]
PHST- 2011/02/25 06:00 [medline]
AID - 10.1007/s10856-010-4146-x [doi]
PST - ppublish
SO  - J Mater Sci Mater Med. 2010 Nov;21(11):2901-5. doi: 10.1007/s10856-010-4146-x. 
      Epub 2010 Aug 18.