A zinc-doped endodontic cement facilitates functional mineralization and stress dissipation at the dentin surface
Med. oral patol. oral cir. bucal (Internet)
; 23(6): e646-e655, nov. 2018. ilus, tab
Article
in English
| IBECS
| ID: ibc-176386
Responsible library:
ES1.1
Localization: BNCS
ABSTRACT
BACKGROUND:
The purpose of this study was to evaluate nanohardness and viscoelastic behavior of dentin surfaces treated with two canal sealer cements for dentin remineralization. MATERIAL ANDMETHODS:
Dentin surfaces were subjected to I) 37% phosphoric acid (PA) or II) 0.5 M ethylenediaminetetraacetic acid (EDTA) conditioning prior to the application of two experimental hydroxyapatite-based cements, containing sodium hydroxide (calcypatite) or zinc oxide (oxipatite), respectively. Samples were stored in simulated body fluid during 24 h or 21 d. The intertubular and peritubular dentin were evaluated using a nanoindenter to assess nanohardness (Hi). The load/displacement responses were used for the nano-dynamic mechanical analysis to estimate complex modulus (E*) and tan delta (δ). The modulus mapping was obtained by imposing a quasistatic force setpoint to which a sinusoidal force was superimposed. AFM imaging and FESEM analysis were performed.RESULTS:
After 21 d of storage, dentin surfaces treated with EDTA+calcypatite, PA+calcypatite and EDTA+oxipatite showed viscoelastic discrepancies between peritubular and intertubular dentin, meaning a risk for cracking and breakdown of the surface. At both 24 h and 21 d, tan δ values at intertubular dentin treated with the four treatments performed similar. At 21 d time point, intertubular dentin treated with PA+oxipatite achieved the highest complex modulus and nanohardness, i.e., highest resistance to deformation and functional mineralization, among groups.CONCLUSIONS:
Intertubular and peritubular dentin treated with PA+oxipatite showed similar values of tan δ after 21 d of storage. This produced a favorable dissipation of energy with minimal energy concentration, preserving the structural integrity at the dentin surface
Full text:
Available
Collection:
National databases
/
Spain
Database:
IBECS
Main subject:
Zinc Phosphate Cement
/
Bone Cements
/
Calcification, Physiologic
/
Dental Cementum
/
Dentin
Limits:
Humans
Language:
English
Journal:
Med. oral patol. oral cir. bucal (Internet)
Year:
2018
Document type:
Article
Institution/Affiliation country:
University College Cork/Ireland
/
University of Granada/Spain
/
University of La Havana/Cuba