PMID- 18452892
OWN - NLM
STAT- MEDLINE
DCOM- 20090330
LR  - 20211020
IS  - 0003-9969 (Print)
IS  - 0003-9969 (Linking)
VI  - 53
IP  - 8
DP  - 2008 Aug
TI  - Hertzian contact response of dentin with loading rate and orientation.
PG  - 729-35
LID - 10.1016/j.archoralbio.2008.02.013 [doi]
AB  - OBJECTIVE: To test the hypothesis that dentin Hertzian contact response varies 
      with loading rate and tubule orientation. DESIGN: Sound teeth (n=12) were cut 
      either parallel or perpendicular to the axial direction to expose dentin (n=6 
      each). The cut specimens were embedded (poly-methyl-methacrylate (PMMA) and 
      divided into two groups: (GL) load applied parallel to dentin tubule direction 
      and (GP) load applied perpendicular to tubule direction. A 1.5mm diameter 
      tungsten-carbide ball was used for Hertzian contact testing with a maximum load 
      of 150 N load and loading rates of 0.1, 1, 100, and 1000 N/s on each specimen. 
      Indented specimens were observed microscopically and photomicrographs acquired. 
      Hertzian contact diameter and modulus were analysed (p<0.05) by one-way ANOVA and 
      Tukey test. RESULTS: There were significant differences (p<0.05) in Hertzian 
      response with respect to loading rate for GL (0.1N/s versus 1000 N/s, 0.1N/s 
      versus 100 N/s, 1N/s versus 1000 N/s, and 1N/s versus 100 N/s), and GP (0.1N/s 
      versus 1000 N/s, 0.1N/s versus 100 N/s, and 1N/s versus 1000 N/s). Contact 
      modulus was higher for GL compared to GP at all loading rates (p<0.05). 
      CONCLUSION: The results suggest that dentin contact modulus is loading rate 
      dependent. Tubule orientation of dentin did not influence contact modulus values 
      (p>0.05).
FAU - da Silva, Nelson Renato Franca Alves
AU  - da Silva NR
AD  - Department of Prosthodontics, New York University College of Dentistry, NY, USA. 
      nrd1@nyu.edu
FAU - Lalani, F
AU  - Lalani F
FAU - Coelho, Paulo G
AU  - Coelho PG
FAU - Clark, Elizabeth A
AU  - Clark EA
FAU - Fernandes, Carlos Augusto de Oliveira
AU  - Fernandes CA
FAU - Thompson, Van P
AU  - Thompson VP
LA  - eng
GR  - P01 DE010976-070008/DE/NIDCR NIH HHS/United States
GR  - P01-DE10976/DE/NIDCR NIH HHS/United States
PT  - Journal Article
PT  - Research Support, N.I.H., Extramural
PT  - Research Support, Non-U.S. Gov't
DEP - 20080502
PL  - England
TA  - Arch Oral Biol
JT  - Archives of oral biology
JID - 0116711
SB  - IM
CIN - Arch Oral Biol. 2009 Dec;54(12):1125-7. PMID: 19944201
MH  - Dental Stress Analysis/methods
MH  - Dentin/*ultrastructure
MH  - Humans
MH  - Imaging, Three-Dimensional
MH  - Orientation
MH  - *Stress, Mechanical
EDAT- 2008/05/03 09:00
MHDA- 2009/03/31 09:00
CRDT- 2008/05/03 09:00
PHST- 2007/08/09 00:00 [received]
PHST- 2008/02/04 00:00 [revised]
PHST- 2008/02/18 00:00 [accepted]
PHST- 2008/05/03 09:00 [pubmed]
PHST- 2009/03/31 09:00 [medline]
PHST- 2008/05/03 09:00 [entrez]
AID - S0003-9969(08)00048-4 [pii]
AID - 10.1016/j.archoralbio.2008.02.013 [doi]
PST - ppublish
SO  - Arch Oral Biol. 2008 Aug;53(8):729-35. doi: 10.1016/j.archoralbio.2008.02.013. 
      Epub 2008 May 2.