PMID- 1521692
OWN - NLM
STAT- MEDLINE
DCOM- 19921015
LR  - 20191021
IS  - 0109-5641 (Print)
IS  - 0109-5641 (Linking)
VI  - 8
IP  - 2
DP  - 1992 Mar
TI  - Effect of HEMA on bonding to dentin.
PG  - 125-30
AB  - The present study investigated the effectiveness of treating dentin with 
      2-hydroxyethyl methacrylate (HEMA) prior to application of an adhesive resin. The 
      adhesive resin was 5% 4-methacryloxyethyl trimellitate anhydride (4-META) in 
      methyl methacrylate (MMA) combined with poly-MMA powder. Polymerization of this 
      resin was initiated by tri-n-butyl borane (TBB). Bovine dentin samples were 
      ground with 600-grit Carbimet paper discs, and demineralized with either an 
      aqueous solution of 10% citric acid/3% ferric chloride (10-3) or an aqueous 
      solution of 10% citric acid (10-0). Improved bond strengths were achieved with 
      HEMA treatment of bovine dentin samples, and improvement of bond strengths was 
      dependent upon the time period of HEMA application. Scanning electron microscope 
      (SEM) examination revealed the formation of a transitional zone of 
      resin-reinforced dentin, termed the "hybrid" layer, in those specimens receiving 
      10-3 pre-treatment. The adhesive resin impregnated the exposed collagen bundles 
      with which it entangled to create the "hybrid", essential in the attainment of 
      high tensile bond strengths. Specimens pre-treated with 10-0 did not readily form 
      "hybrid" layers. However, if HEMA application followed the 10-0 pre-treatment, 
      "hybrids" were demonstrated on SEM, and bond strength increased to 13 MPa. The 
      ferric ions in the 10-3 effectively improved the diffusivity of dentinal 
      substrates, as did HEMA. This study indicates that HEMA applied to dentinal 
      substrates enhances monomer diffusion and entanglement with dentinal components, 
      and facilitates the formation of a "hybrid" layer.
FAU - Nakabayashi, N
AU  - Nakabayashi N
AD  - Institute for Medical and Dental Engineering, Tokyo Medical and Dental 
      University.
FAU - Takarada, K
AU  - Takarada K
LA  - eng
GR  - 02205034/PHS HHS/United States
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PT  - Research Support, U.S. Gov't, P.H.S.
PL  - England
TA  - Dent Mater
JT  - Dental materials : official publication of the Academy of Dental Materials
JID - 8508040
RN  - 0 (Methacrylates)
RN  - 0 (Surface-Active Agents)
RN  - 6E1I4IV47V (hydroxyethyl methacrylate)
MH  - Adhesiveness
MH  - *Dental Bonding
MH  - *Dentin
MH  - Methacrylates/*chemistry
MH  - Microscopy, Electron, Scanning
MH  - Surface Properties
MH  - Surface-Active Agents
MH  - Tensile Strength
EDAT- 1992/03/01 00:00
MHDA- 1992/03/01 00:01
CRDT- 1992/03/01 00:00
PHST- 1992/03/01 00:00 [pubmed]
PHST- 1992/03/01 00:01 [medline]
PHST- 1992/03/01 00:00 [entrez]
AID - 0109-5641(92)90067-M [pii]
AID - 10.1016/0109-5641(92)90067-m [doi]
PST - ppublish
SO  - Dent Mater. 1992 Mar;8(2):125-30. doi: 10.1016/0109-5641(92)90067-m.