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Repair of dentin defects from DSPP knockout mice by PILP mineralization
H Nurrohman1, K Saeki1, K Carneiro1
1Department of Preventive and Restorative Dental Sciences, University of California, San Francisco, San Francisco, California 94143, USA.
Journal of Materials Research
|May 31, 2016
Summary
Poly-L-aspartic acid in a polymer-induced liquid-precursor system restored mechanical properties and mineralization in dentinogenesis imperfecta type II mouse models, offering potential for hard tissue repair.
Area of Science:
- Biomaterials Science
- Dental Research
- Mineralization Biology
Background:
- Dentinogenesis imperfecta type II (DGI-II) is characterized by a lack of intrafibrillar mineral, severely impairing dentin's mechanical properties.
- A Dspp knockout mouse model (Dspp-/-) mimics human DGI-II, providing a platform to study potential therapeutic interventions.
Purpose of the Study:
- To investigate if poly-L-aspartic acid [poly(ASP)] within a polymer-induced liquid-precursor (PILP) system can restore the mechanical properties of Dspp-/- mouse dentin.
- To evaluate the effect of PILP treatment on dentin mineralization and structural integrity.
Main Methods:
- Dentin samples from Dspp-/- and wild-type mice were treated with a CaP solution containing poly(ASP).
- Mechanical properties (elastic modulus, hardness) were measured before and after treatment.
- Mineralization was assessed using Micro-XCT, and matrix mineralization/crystallography were analyzed via TEM/SAED.
Main Results:
- Dspp-/- dentin exhibited significantly reduced mechanical properties compared to wild-type dentin.
- PILP treatment significantly recovered the mechanical properties of Dspp-/- dentin to levels comparable to wild-type.
- Micro-XCT and TEM/SAED confirmed mineral recovery and repair of defective dentin structure.
Conclusions:
- PILP treatment effectively restores mechanical properties and mineralization in a mouse model of DGI-II.
- This approach shows promise for developing novel strategies for hard tissue repair and regeneration.
