Ultrastructure of the surface of dental enamel with molar incisor hypomineralization (MIH) with and without acid etching.
Acta Odontol Latinoam
; 28(2): 192-8, 2015.
Article
in En
| MEDLINE
| ID: mdl-26355892
ABSTRACT
The aim of the present work was to analyze the ultrastructure and mineral composition of the surface of the enamel on a molar with MIH, with and without acid etching. A permanent tooth without clinical MIH lesions (control) and a tooth with clinical diagnosis of mild and moderate MIH, with indication for extraction, were processed with and without acid etching (H3PO4 37%, 20") for observation with scanning electron microscope (SEM) ZEISS (Supra 40) and mineral composition analysis with an EDS detector (Oxford Instruments). The control enamel showed normal prismatic surface and etching pattern. The clinically healthy enamel on the tooth with MIH revealed partial loss of prismatic pattern. The mild lesion was porous with occasional cracks. The moderate lesion was more porous, with larger cracks and many scales. The mineral composition of the affected surfaces had lower Ca and P content and higher O and C. On the tooth with MIH, even on normal looking enamel, the demineralization does not correspond to an etching pattern, and exhibits exposure of crystals with rods with rounded ends and less demineralization in the inter-prismatic spaces. Acid etching increased the presence of cracks and deep pores in the adamantine structure of the enamel with lesion. In moderate lesions, the mineral composition had higher content of Ca, P and Cl. Enamel with MIH, even on clinically intact adamantine surfaces, shows severe alterations in the ultrastructure and changes in ionic composition, which affect the acid etching pattern and may interfere with adhesion.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Dental Enamel
Limits:
Humans
Language:
En
Journal:
Acta Odontol Latinoam
Journal subject:
ODONTOLOGIA
Year:
2015
Document type:
Article
Affiliation country:
Argentina
Country of publication:
AR
/
ARGENTINA