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Biomimetic Conditioning of Human Dentin Using Citric Acid


Ivica, Anja; Zehnder, Matthias; Mateos, José María; Ghayor, Chafik; Weber, Franz E (2019). Biomimetic Conditioning of Human Dentin Using Citric Acid. Journal of Endodontics, 45(1):45-50.

Abstract

INTRODUCTION: In carious teeth, transforming growth factor beta 1 (TGF-β1) is released from the dentin matrix and possibly activated in an acidic environment. Conversely, EDTA solutions with a neutral to slightly alkaline pH are used in clinics to promote cell homing in regenerative endodontic procedures. We hypothesized that citric acid (CA) might be more beneficial.
METHODS: TGF-β1 release from human dentin disks conditioned with either 10% CA (pH = 2) or 17% EDTA (pH = 8) and the behavior of human stem cells toward such pretreated dentin were studied. The protein concentration in conditioning solutions after 10 minutes of dentin exposure was determined using a pH-independent slot blot technique.
RESULTS: There was a 5-fold higher concentration of the target protein in CA (382 ± 30 ng/disk) compared with EDTA (66 ± 3 ng/disk, P < .005). Using confocal laser scanning microscopy on immunofluorescent-labeled disks, we identified a high density of TGF-β1 in peritubular dentin after CA treatment. A migration assay showed that CA conditioning attracted significantly more stem cells toward the dentin after 24 hours compared with EDTA (P < .05) or phosphate-buffered saline (P < .005). To investigate whether the cell response to these dentin surfaces could be affected by different pretreatments, we cultured stem cells on conditioned dentin disks and found that CA had a significantly (P < .05) better effect than EDTA on cell attachment and cell survival.
CONCLUSIONS: CA conditioning could be useful and may have significant benefits over current treatments.

Abstract

INTRODUCTION: In carious teeth, transforming growth factor beta 1 (TGF-β1) is released from the dentin matrix and possibly activated in an acidic environment. Conversely, EDTA solutions with a neutral to slightly alkaline pH are used in clinics to promote cell homing in regenerative endodontic procedures. We hypothesized that citric acid (CA) might be more beneficial.
METHODS: TGF-β1 release from human dentin disks conditioned with either 10% CA (pH = 2) or 17% EDTA (pH = 8) and the behavior of human stem cells toward such pretreated dentin were studied. The protein concentration in conditioning solutions after 10 minutes of dentin exposure was determined using a pH-independent slot blot technique.
RESULTS: There was a 5-fold higher concentration of the target protein in CA (382 ± 30 ng/disk) compared with EDTA (66 ± 3 ng/disk, P < .005). Using confocal laser scanning microscopy on immunofluorescent-labeled disks, we identified a high density of TGF-β1 in peritubular dentin after CA treatment. A migration assay showed that CA conditioning attracted significantly more stem cells toward the dentin after 24 hours compared with EDTA (P < .05) or phosphate-buffered saline (P < .005). To investigate whether the cell response to these dentin surfaces could be affected by different pretreatments, we cultured stem cells on conditioned dentin disks and found that CA had a significantly (P < .05) better effect than EDTA on cell attachment and cell survival.
CONCLUSIONS: CA conditioning could be useful and may have significant benefits over current treatments.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > Center for Microscopy and Image Analysis
04 Faculty of Medicine > Center for Dental Medicine > Clinic of Conservative and Preventive Dentistry
Dewey Decimal Classification:610 Medicine & health
Scopus Subject Areas:Health Sciences > General Dentistry
Language:English
Date:January 2019
Deposited On:15 Mar 2019 08:26
Last Modified:21 May 2024 01:38
Publisher:Elsevier
ISSN:0099-2399
OA Status:Hybrid
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1016/j.joen.2018.09.015
PubMed ID:30448020
  • Content: Published Version
  • Licence: Creative Commons: Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)