Fiber reinforced glass ionomer cements for dental applications:
Gespeichert in:
| 1. Verfasser: | |
|---|---|
| Format: | Buch |
| Sprache: | English |
| Veröffentlicht: |
Berlin
Logos Verl.
2003
|
| Schlagworte: | |
| Online-Zugang: | Inhaltsverzeichnis |
| Beschreibung: | Zugl.: Erlangen-Nürnberg, Univ., Diss., 2003. - Enth. Zsfassung in engl. und dt. Sprache |
| Beschreibung: | XV, 173 S. graph. Darst. |
| ISBN: | 3832504249 |
Internformat
MARC
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| 100 | 1 | |a Lohbauer, Ulrich |e Verfasser |4 aut | |
| 245 | 1 | 0 | |a Fiber reinforced glass ionomer cements for dental applications |c von Ulrich Lohbauer |
| 264 | 1 | |a Berlin |b Logos Verl. |c 2003 | |
| 300 | |a XV, 173 S. |b graph. Darst. | ||
| 336 | |b txt |2 rdacontent | ||
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| 338 | |b nc |2 rdacarrier | ||
| 500 | |a Zugl.: Erlangen-Nürnberg, Univ., Diss., 2003. - Enth. Zsfassung in engl. und dt. Sprache | ||
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Datensatz im Suchindex
| _version_ | 1804130529240416256 |
|---|---|
| adam_text | Outline
Summary 1
Zusammenfassung 3
1 Introduction and aims 5
2 Literature review: glass ionomer cements (GIC) 7
2.1 Historical development of GICs 7
2.2 Oral Situation 9
2.3 GIC composition and setting process 14
2.4 Material properties 20
2.5 Cement property manipulation 24
3 Literature review: fiber reinforced composites 27
3.1 Linear elastic fracture mechanics 27
3.2 Short fiber reinforcement 33
4 Experimental procedure 39
4.1 Glass, fiber and acid selection 39
4.2 Cement processing 44
4.3 Microstructure 50
4.4 Mechanical properties evaluation 54
4.5 Specific dental measurements 61
I
Outline
4.6 Statistical analysis 66
5 Results 67
5.1 Short fiber manufacturing 67
5.2 Processing of GICs 75
5.3 FRGIC composite characterization and properties 79
5.4 Fiber matrix interface 91
5.5 Preclinical assessment of dental GICs and FRGICs 100
6 Discussion 105
6.1 Fiber reinforcement 105
6.2 Fiber matrix interface 116
6.3 Fiber orientation 128
6.4 Fiber loading 136
6.5 Preclinical and clinical suitability of dental GICs and FRGICs 140
7 Conclusions 154
8 References 156
9 Acknowledgement 171
Curriculum vitae 172
II
Outline
List of figures
Fig. 2.1: Human incisal tooth structure with etched (H3PO4) enamel prisms 9
(Fig. 2.1a) and etched (H3PO4) dentin tubular structure (Fig 2.1b).
Fig. 2.2: Cavity classification according to Black: Class I: cavities in pits and 12
fissures on the facial, lingual and occlusal surfaces of molars and
premolars; Class 11: cavities on the proximal surfaces of posterior teeth;
Class 111: cavities on the proximal surfaces of anterior teeth with no
incisal angle; Class IV: cavities on the proximal surfaces of anterior
teeth when an incisal angle needs restoration; Class V: cavities on
smooth facial and lingual surfaces in the gingival third of the teeth.
Fig. 2.3: Setting reaction ofaglass ionomer cement [7]. 14
Fig 2.4: Process stages of the cement setting. 15
Fig 2.5: Polycarboxylic acids for GIC forming [7]. 18
Fig 3.1: Fig 3.1: Composite modulus for various fiber volume fractions 28
showing the upper and lower limits of eqn 3.3 and 3.4 (loading
perpendicular(I) and parallel (II) to fiber extension) [91 ].
Fig 3.2: Geometrical description of a planar edge crack under plane stress 30
conditions.
Fig 3.3: Slow crack propagation in brittle materials [89]. 32
Fig 3.4: Principal cross section of a chopped fiber reinforced composite. 34
The two orientation angles ©and /?define the angular orientation
of the fiber with respect to the coordinate system x,y,z.
Ill
Outline
Fig 3.5: The variation of tensile strength 07s with volume fraction of fibers 35
[101].
Fig 3.6: Principal load transfer from matrix into a chopped fiber [101]. 36
Fig 3.7: Classification of fracture mechanisms in unidirectional fiber 37
composites [103].
Fig 4.1: Design of the fiber drawing bushing [110]. 42
Fig 4.2: Cement mixing tools (liquid dropper, liquid, powder, spatula). 45
Fig 4.3: Mechanical hardening measurements according to ISO 9917 standard. 46
Fig 4.4: Principles of a conduction type twin calorimeter (Erlanger 48
Vierlingskalorimeter).
Fig 4.5: Notched specimen for fracture toughness testing. 57
Fig 4.6: Staircase method principles. 59
Fig 4.7: Preparation of u TBS specimen [126]. 62
Fig 4.8: Cavity design of class II mesial/occlusal (MO) preparations. 63
Fig 5.1: Chopped glass fibers cut to an average length of 580 urn prior to 67
composite processing.
Fig 5.2: Fiber length distribution of the chopped glass fibers prior to 68
compounding in the cement matrix.
Fig 5.3: Fiber length distribution of the chopped glass fibers after separation 69
from the cement matrix.
Fig 5.4: Surface roughness of a drawn fiber. 70
Fig 5.5: High temperature viscosity measurement close to the glass 71
melting point (viscosity 77= 102 dPasec)
Fig 5.6: XRD plot of the glass frit. 72
IV
Outline
Fig 5.7: TEM micrograph of the glass fiber with different regions: 72
(A) separated droplet phase, (B) CaF2 crystals, (C) amorphous glass.
Fig 5.8: EDX analysis of a droplet phase particle from Fig 5.7. 73
Fig 5.9: Grain size distributions of GICs using different milling techniques 76
before and after particle pre treatment.
Fig 5.10: Effect of acid washing and tempering of the glass particles of cement 77
working time.
Fig 5.11: DSC plot over the glass transition temperature Tg. 77
Fig 5.12: Influence of powder to liquid ratio on compressive strength. 78
Fig 5.13: Influence of increasing fraction of chopped fibers on compressive 79
strength of the cement.
Fig 5.14: Coordinate system describing the fiber orientation distribution of a 80
rectangular specimen using the deviation angles 6 and p.
Fig 5.15: Fiber orientation distribution plot ofaFRGIC specimen loaded 81
with 20 vol % fibers.
Fig 5.16: Inherent porosities oftheG4 (a) and G9(c) GICs, the F5 (d) FRG1C 83
and Ketac* Molar (hand spatulated (b) and encapsulated (e) version).
Fig 5.17: Load displacement curves for the G1C and FRGIC materials 84
exhibiting the amount of total energy release rate G,.
Fig 5.18: The critical energy release rates of the matrix Gt (dark grey) 85
and the contribution of the fibers AGf (white).
Fig 5.19: FRGIC (F5) fracture surface prepared according to the single edge 86
notched beam method, indicating a notch depth of approx. 600 urn
and a fiber pull out length up to 350 um.
Fig 5.20: The fracture toughness K/c of various GIC and FRGIC compositions. 87
Fig 5.21: Weibull plots of the strength distributions of GICs and FRGICs. 89
V
Outline
Fig 5.22: Modulus of elasticity of various GIC and FRGIC compositions. 90
Fig 5.23: Reactive surface layer at the fiber matrix interface (F5). 91
Fig 5.24: Reactive surface layer at the fiber matrix interface 91
(F6,2 min premixing).
Fig 5.25: EDX/TEM analysis of the fiber (A) matrix(B) interface with ion 92
diffusion into the amorphous glass matrix.
Fig 5.26: FTIR absorption spectra of the cement forming reactions (GIC) 94
compared to the cement liquefiers H2O and D2O.
Fig 5.27: FTIR absorption spectra oftheG4 cement at various setting stages. 95
Fig 5.28: Calorimetric development of the reaction process of a GIC (G9). 97
Fig 5.29: Calorimetric development of the reaction process of a commercial GIC 97
(Ketac® Molar Handmix, 3MESPE, Seefeld, Germany).
Fig 5.30: Cement mixing and setting stages determination according to 99
ISO 9917 standard.
Fig 5.31: Elastic modulus, fracture strength (FS) and flexural fatigue limit 100
(FFL) of a GIC (G9) as a function of storage time in water.
Fig 5.32: u TBS of the dentin GIC (G9) and dentin FRGIC (F5) interface 101
applying different conditioners on the dentin surface.
Fig 5.33: Development of marginal integrity, prior and after thermocy cling, 103
indicated by the criterion perfect margin .
Fig 6.1: Fracture surface of FRGIC showing pull out of fibers. 105
Fig 6.2: Typical stress strain behavior of a short fiber reinforced glass 106
ionomer cement.
Fig 6.3: Schematic indicating the various contributions to toughening 109
mechanisms of a crack bridging ligament.
Fig 6.4: Theoretical variation of the processing variables yf, F,, and r Hi
VI i
Outline
of eqn 6.8.
Fig 6.5: Reduction of the stress intensity in the stress field around a crack tip 113
in the presence of a toughening zone.
Fig 6.6: Fracture mechanism map for a uniaxially reinforced fiber 117
composite as a function of fiber matrix interfacial strength [140].
Fig 6.7: Schematics of local stresses influencing the interfacial shear strength r 118
at the fiber surface.
Fig 6.8: Scratches on a fiber surface due to frictional sliding. 121
Fig 6.9: Theoretical variation of parameters influencing the interfacial shear 122
strength r.
Fig 6.10: Orientation dependence of fracture strength for off axis tests for 129
unidirectional laminates [81].
Fig 6.11: Orientation dependence of the fracture strength for a randomly 130
oriented FRGIC.
Fig 6.12: Schematic diagram indicating the mechanical conditions of the 131
interactions between an inclined reinforcement and the local
matrix [138].
Fig 6.13: Orientation dependent toughening mechanism diagram [138]. 133
Fig 6.14: Fiber bundle acting as an accumulated defect on the fracture 137
process (F7).
Fig 6.15: Overlapping fibers on a fracture surface of a FRGIC (F5). 137
Fig 6.16: Calculated upper (eqn 3.3) and lower (eqn 3.4) limits for the 138
elastic modulus of the FRGIC under investigation and the actual
measured elastic modulus at a fiber loading of 20 vol % (F5).
Fig 6.17: Principal hydrolysis configurations during cement hardening [7]. 141
Fig 6.18: The loss of marginal seal (D) between dentin(B) and the G9GIC(C) 145
VII
Outline
after thermomechanical loading. The dentin (B) enamel (A)
junction is indicated.
Fig 6.19: Dentin (A) FRGIC (B) margin indicating exposed fibers in the gap. 146
Fig 6.20: Experimental placement of the glass ionomer cement in the mold. 149
Fig 6.21: Clinical placement of the glass ionomer cement in a dental cavity. 149
Fig 6.22: Fiber distribution in a dental cavity section of the approximal box 150
of a MO cavity (ZY plane). The arrows indicate a radial fiber
alignment.
Fig 6.23: Fiber distribution in a dental cavity cross section through a MOD 151
cavity (ZX plane). The arrows indicate the aligned fibers
perpendicular to the pressing direction.
Fig 6.24: Fiber distribution in a dental cavity occlusal section of Fig 6.23 152
(YX plane). Radial fiber alignment is indicated by the arrows.
Fig 6.25: Schematic clinical fiber distributions for MO and MOD cavities 153
as a function of the orientation angle 0.
VIII 1
Outline
List of Tables
TABLE 2.1 Selection of mechanical and physical properties of human dental 10
tissue [23].
TABLE 4.1: Infrared absorption of setting reaction compounds [30]. 47
TABLE 4.2: Test specifications and results of the cement optimizing tests. 56
TABLE 5.1: Results of the glass powder processing. 75
TABLE 5.2: Porosity and pore size of GlCs, FRGlCs and commercial 82
standard materials.
TABLE 5.3: Experimental results for the elastic modulus Ec, critical stress 87
intensity factor K/c, critical energy release rates Gc, AGf, and for the
total energy release rate G, [Mean] (SD).
TABLE 5.4: Test specifications for GIC and FRG1C processing and their 88
flexural strengths.
TABLE 5.5: Weibull parameters m and a0. 89
TABLE 5.6: Quantitative assessment of the cement forming reactions of G4 in 95
reference to the COOH peak.
TABLE 5.7: Results of the calorimetrical evaluation of the setting process. 96
TABLE 5.8: Linear coefficients of thermal expansion of dental restoratives measured 102
between 20 °C and 60 °C.
TABLE 5.9: Fluoride release [ppm/d] of experimental GICs and FRGlCs 104
compared to a commercial standard.
TABLE 6.1: Measured and estimated parameters taken for calculation of AG/ 110
from eqn 6.8.
TABLE 6.2: Calculated fracture toughness Kc in comparison with the measured 114
steady state fracture toughness.
IX
Outline .—
TABLE 6.3: Percentage of inclined fibers under an angle of ± 50 (0=0°). 134
TABLE 6.4: Selection of long time physical properties of a GIC (G9). I40
X *
|
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| indexdate | 2024-07-09T19:22:29Z |
| institution | BVB |
| isbn | 3832504249 |
| language | English |
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| physical | XV, 173 S. graph. Darst. |
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| spelling | Lohbauer, Ulrich Verfasser aut Fiber reinforced glass ionomer cements for dental applications von Ulrich Lohbauer Berlin Logos Verl. 2003 XV, 173 S. graph. Darst. txt rdacontent n rdamedia nc rdacarrier Zugl.: Erlangen-Nürnberg, Univ., Diss., 2003. - Enth. Zsfassung in engl. und dt. Sprache Glas-Ionomer-Zement (DE-588)4201091-3 gnd rswk-swf Glasfaser (DE-588)4021153-8 gnd rswk-swf Faserverstärkung (DE-588)4282525-8 gnd rswk-swf (DE-588)4113937-9 Hochschulschrift gnd-content Glas-Ionomer-Zement (DE-588)4201091-3 s Faserverstärkung (DE-588)4282525-8 s Glasfaser (DE-588)4021153-8 s DE-604 HBZ Datenaustausch application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=010710669&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis |
| spellingShingle | Lohbauer, Ulrich Fiber reinforced glass ionomer cements for dental applications Glas-Ionomer-Zement (DE-588)4201091-3 gnd Glasfaser (DE-588)4021153-8 gnd Faserverstärkung (DE-588)4282525-8 gnd |
| subject_GND | (DE-588)4201091-3 (DE-588)4021153-8 (DE-588)4282525-8 (DE-588)4113937-9 |
| title | Fiber reinforced glass ionomer cements for dental applications |
| title_auth | Fiber reinforced glass ionomer cements for dental applications |
| title_exact_search | Fiber reinforced glass ionomer cements for dental applications |
| title_full | Fiber reinforced glass ionomer cements for dental applications von Ulrich Lohbauer |
| title_fullStr | Fiber reinforced glass ionomer cements for dental applications von Ulrich Lohbauer |
| title_full_unstemmed | Fiber reinforced glass ionomer cements for dental applications von Ulrich Lohbauer |
| title_short | Fiber reinforced glass ionomer cements for dental applications |
| title_sort | fiber reinforced glass ionomer cements for dental applications |
| topic | Glas-Ionomer-Zement (DE-588)4201091-3 gnd Glasfaser (DE-588)4021153-8 gnd Faserverstärkung (DE-588)4282525-8 gnd |
| topic_facet | Glas-Ionomer-Zement Glasfaser Faserverstärkung Hochschulschrift |
| url | http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=010710669&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA |
| work_keys_str_mv | AT lohbauerulrich fiberreinforcedglassionomercementsfordentalapplications |