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Arch Oral Biol. 2017 Oct;82:194-202. doi: 10.1016/j.archoralbio.2017.06.006. Epub 2017 Jun 15.

Recovery after PILP remineralization of dentin lesions created with two cariogenic acids.

Author information

1
Department of Preventive and Restorative Dental Sciences, University of California, San Francisco, 707 Parnassus Avenue, San Francisco, CA, 94143-0758, USA. Electronic address: kuniko.saeki@ucsf.edu.
2
Department of Preventive and Restorative Dental Sciences, University of California, San Francisco, 707 Parnassus Avenue, San Francisco, CA, 94143-0758, USA.
3
Department of Materials Science and Engineering, University of Florida, Gainesville, FL 32611-6400, USA.

Abstract

OBJECTIVES:

Acetate and lactate are important cariogenic acids produced by oral bacteria. They produced different residual dentin structures in artificial lesions of similar depth. We evaluated if such lesions responded in the same way to a polymer-induced-liquid-precursor (PILP) remineralization.

DESIGN:

Dentin blocks obtained from human third molars, divided into 6 groups (n=3). Blocks were demineralized with acetate (66h) or lactate (168h) buffer at pH 5.0 to create 140μm target lesion depths. A-DEM and L-DEM groups received no remineralization. Other groups were remineralized for 14days. 100μg/mL polyaspartate was added into the remineralizing buffer for A-PIL and L-PIL, whereas A-CAP and L-CAP were treated with the same solution but without polyaspartate. Cross-sectioned blocks were examined for shrinkage and AFM-topography. Line profiles of reduced elastic modulus (Er) were obtained by AFM-based nanoindentation across the lesion. Ultrastructures were examined with TEM.

RESULTS:

A-PIL and L-PIL recovered in shrinkage to the original height of the dentin and it appeared normal with tubules, with increases in Er at both outer flat and inner sloped zones. At the sloped zone, acetate lesions lost more Er but recovery rate after PILP was not statistically different from lactate lesions. A-CAP and L-CAP showed surface precipitates, significantly less recovery in shrinkage or Er as compared to PILP groups. TEM-ultrastructure of PILP groups showed similar structural and mineral components in the sloped zone for lesions produced by either acid.

CONCLUSIONS:

The PILP process provided significant recovery of both structure and mechanical properties for artificial lesions produced with acetate or lactate.

KEYWORDS:

Atomic force microscopy; Demineralization; Dentin caries models; Nanomechanical property; PILP mineralization; Remineralization

PMID:
28647649
PMCID:
PMC5600685
DOI:
10.1016/j.archoralbio.2017.06.006
[Indexed for MEDLINE]
Free PMC Article

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