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Etching Efficacy of Self-Etching Functional Monomers.

K Yoshihara1, S Hayakawa2, N Nagaoka3

  • 11 Center for Innovative Clinical Medicine, Okayama University Hospital, Okayama, Japan.

Journal of Dental Research
|March 20, 2018
PubMed
Summary
This summary is machine-generated.

The etching efficacy of functional monomers in self-etch adhesives was evaluated by measuring hydroxyapatite dissolution and salt formation. 10-MDP demonstrated superior etching potential alongside chemical bonding, explaining its enhanced adhesive performance.

Keywords:
X-ray crystallographyadhesivesenamelhydroxyapatitemicroscopynuclear magnetic resonance

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Area of Science:

  • Dental Materials Science
  • Adhesion Science
  • Biomaterials Chemistry

Background:

  • Acidic functional monomers in self-etch adhesives are crucial for etching tooth surfaces, dissolving the smear layer, and enabling micro-retention.
  • Traditional pH measurement of adhesives is inaccurate; hydroxyapatite (HAp)-dissolving capacity and monomer-calcium salt formation are better indicators of etching efficacy.

Purpose of the Study:

  • To investigate and compare the etching efficacy of six functional monomers: GPDM, phenyl-P, MTEGP, 4-META, 6-MHP, and 10-MDP.
  • To correlate etching potential with the formation of monomer-calcium salts and hydroxyapatite dissolution.

Main Methods:

  • Solutions of 15 wt% monomer, 45 wt% ethanol, and 40 wt% water were prepared.
  • Enamel surfaces were analyzed using scanning electron microscopy (SEM) and X-ray diffraction (XRD).
  • Hydroxyapatite (HAp)-dissolving capacity was measured via inductively coupled plasma-atomic emission spectroscopy (ICP-AES), and monomer-calcium salt formation was quantified using 31P magic-angle spinning (MAS) nuclear magnetic resonance (NMR).

Main Results:

  • Phenyl-P showed a strong etching effect on enamel.
  • 10-MDP treatment resulted in substance deposition, identified as 10-MDP-calcium salt.
  • ICP-AES indicated phenyl-P released the most Ca, while 4-META and 10-MDP released the least. However, 10-MDP formed significant 10-MDP-calcium salts, suggesting higher actual Ca release than measured.

Conclusions:

  • The superior bonding effectiveness of 10-MDP-based adhesives is attributed to both its strong chemical bonding and its significant etching potential.
  • 10-MDP's ability to form calcium salts influences its measured hydroxyapatite-dissolving capacity.
  • The combination of strong chemical interaction and effective etching potential distinguishes 10-MDP from the other investigated functional monomers.