Bioapatites. BeátaKerémi DMD, PhD Department of Oral Biology

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1 Bioapatites BeátaKerémi DMD, PhD Department of Oral Biology

2 Mineralized ( hard ) tissues: Bones Teeth Enamel Cementum Dentin Hydroxy(l)-apatite

3 Data correspond to 100 g dry weight. Composition of hard tissues: Enamel Dentine Cementum Bone Total inorganic Total organic Water Ash: Calcium* Phosphorus* Ca/P ratio Sodium* Magnesium* Potassium* Fluoride* < Cloride* Unashed (dry tissue): Carbonate Pyrophosphate

4 Composition of enamel, dentin and cementum: Enamel: 96-99% anorganic substances 1-2% organic substances NO collagen! Mature enamel: enamelin and TRAP (tyrosin rich protein) Immature enamel: enamelin and amelogenin 3% water density: 3 mg/ml See: Mineralized tissues practice!!!

5 Composition of enamel, dentin and cementum: Dentin: 70% anorganic substances 20% organic substances Collagen is the major protein Polyanions Sulfated acidic glycoproteins Phosphoproteins 10% water density: 2.1 mg/ml See: Mineralized tissues practice!!!

6 Composition of enamel, dentin and cementum: Cementum: 61% anorganic substances 27% organic substances Collagen is the major protein Polyanions Sulfated acidic glycoproteins Phosphoproteins 12% water density: approx. 2.1 mg/ml See: Mineralized tissues practice!!!

7 Composition of enamel, dentin and cementum: Water Free water Bound water to organic molecule Water built in crystal strucure Organic substances Organic components with nucleator function: Polyanions chelate binding with Ca ions Matrix proteins Collagen, enamelin, amelogenin Regulatory proteins See: Mineralized tissues practice!!!

8 Ionic radius of incorporated ions into apatite crystals Substituents Ionic radius (Å) Cations: Ca Sr Pb Ba Anions: OH F Cl calcium ion Ca 2+ fluoride ion F - hydroxide ion OH - chloride ion Cl -

9 Types of calcium phosphates: Ortho- (PO 3-4 ) Pyro- (P 2 O 4-7 ) Poly- ((PO 3 ) n- n ) phosphates Apatite-substituents Fluorapatite, chlorapatite Dahllites Poorly crystallized forms of hydroxyapatites

10 Types of calcium phosphates: Name Formula Abbr eviati on brushite - dicalcium phosphate dihydrate monetite dicalcium phosphate anhydrate octacalcium phosphate CaHPO 4 *2H 2 O CaHPO 4 DCP D DCP A Ca/P ratio Occurence 1.0 pathological calcifications: calculus, crystalluria, chondrocalcinosis, urinary stones 1.0 calcium-phosphate cement, nutritional supplements, tabletting aids, toothpaste components Ca 8 (HPO 4 ) 2 (PO 4 ) 4 *5H 2 O OCP 1.33 Dental and urinary calculi whitlockite Ca 9 (Mg,Fe)(PO 4 ) 6 (HPO 4 ) WH 1.41 dental calculus, dentine caries, urinary stones β-tricalcium phosphate amorphus calcium phosphate β-ca 3 (PO 4 ) 2 β- TCP Ca x (PO 4 ) y *nh 2 O ACP calcification sites, mitochondria hydroxyapatite Ca 10 (PO 4 ) 6 (OH) 2 HA 1.67 bone, enamel, dentine, calculus 1.5

11 FEATURES OF CRYSTALLIZATION

12 General regularities: The Gibbs-Kelvin principle: Standard free energy Entropy Optimum: the particles are as close as possible to one another maximal volume filling Ionic radius Charge of the components Dynamic balance! enamel surface hydroxy(l)-apatite (de- and remineralization)

13 General regularities: Supersaturated solution crystal formation At several points, they are merging cluster formation Relative surface area Dissolution Impurity ions Fault location Missing lattice point Crystal growth Crystal stabilty deteriorates Increased distance between two lattice points

14 Homogeneous and heterogeneous nucleation: Homogeneous nucleation: Only inorganic components of the crystal High energy is required Heterogeneous nucleation: Nuclei forming organic substances polyanions» (see: above) Less energy is required more favorable for living organisms typical crystallization method of hard tissues Matrix proteins binding Ca-chelates Collagen, amelogenin

15 Homogeneous and heterogeneous nucleation: Homogeneous nucleation: Seeding: preformed crystals are put in a saturated solution To start the crystallization process Seeding (nuclei formation): can occur in vivo primery enamel formation» (see: Dentinogenesis and Amelogenesis lectures) Epitaxy: two crystals grow on each other two types crystal structures! Mononuclear layer by layer growing Polynuclear highly supersaturated solution or - multiple nuclei

16 Factors influencing crystallization: Quality of calcium phosphates Well/poorly crystallized Ca-P-s Size Stability Differencies Speed Rate of supersaturation Temperature Dissolution - solidification ph Nucleation» (see: above)

17 Factors influencing crystallization: Matrix proteins Trace elements Inhibitors» (see: above)» (see: later) Mg, ADP inhibit the crystallization in mitochondria Substances reacting with Ca or P-s

18 SPATIAL STRUCTURE OF APATITE CRYSTALS

19 Structure of hydroxi(l) apatite Ca 2+ PO 4 2- OH -

20 Structure of hydroxi(l) apatite calcium ion Ca 2+ fluoride ion F - hydroxide ion OH - chloride ion Cl -

21 6,9x10-7 mm Stucture of hydroxi(l) apatite Unit cell Spatial locations of calcium and hydroxil ions

22 Structure of hydroxi(l) apatite Enamel, dentin hexagonal prisms Size of enamel prisms > dentin prisms Amount of heterogenous nucleator is less in enamel crystal Enamel becomes more dense Loses organic material - and water content Amorphus-CaP not crystallized Brushite plate-like crystals

23 Trace elements effects on apatite crystals: Cariogenic trace elements: Al exerts its effects through binding to the crystal surface Hg, Cd, Pb Cu, Se Carioprotective trace elements: F, Sn, Sr incorporated into the crystal Mo, V

24 Advantages of fluorapatites: Effect on enamel hydroxil apaptite: Reducing the acid solubility Strengthening the crystal structure Remineralisation of demineralised areas Effect on enamel surface: Inhibitions of proteins and/or bacteria adsorption Reducing the surface energy calcium ion fluoride ion hydroxid ion chloride ion

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