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https://doi.org/10.15644/asc49/1/4

Analiza parametra translucencije staklokeramike izrađene različitim tehnološkim postupcima

Karla Ledić ; Polivalentna stomatološka ordinacija Dom zdravlja Zagreb – Centar, Zagreb, Hrvatska
Igor Majnarić ; Grafički fakultet Sveučilišta u Zagrebu, Zagreb, Hrvatska
Slađana MILARDOVIĆ ORTOLAN ; Stomatološki fakultet Sveučilišta u Zagrebu, Zagreb, Hrvatska
Stjepan Špalj ; Medicinski fakultet Sveučilišta u Rijeci, Rijeka, Hrvatska
Sanja Štefančić ; Stomatološka poliklinika Zagreb, Zagreb, Hrvatska
Ketij Mehulić ; Stomatološki fakultet Sveučilišta u Zagrebu, Zagreb, Hrvatska; Klinika za stomatologiju Klinički bolnički centar Zagreb, Zagreb, Hrvatska

Puni tekst: hrvatski, pdf (336 KB) str. 27-35 preuzimanja: 227* citiraj
APA 6th Edition
Ledić, K., Majnarić, I., MILARDOVIĆ ORTOLAN, S., Špalj, S., Štefančić, S. i Mehulić, K. (2015). Analiza parametra translucencije staklokeramike izrađene različitim tehnološkim postupcima. Acta stomatologica Croatica, 49 (1), 27-35. https://doi.org/10.15644/asc49/1/4
MLA 8th Edition
Ledić, Karla, et al. "Analiza parametra translucencije staklokeramike izrađene različitim tehnološkim postupcima." Acta stomatologica Croatica, vol. 49, br. 1, 2015, str. 27-35. https://doi.org/10.15644/asc49/1/4. Citirano 19.09.2020.
Chicago 17th Edition
Ledić, Karla, Igor Majnarić, Slađana MILARDOVIĆ ORTOLAN, Stjepan Špalj, Sanja Štefančić i Ketij Mehulić. "Analiza parametra translucencije staklokeramike izrađene različitim tehnološkim postupcima." Acta stomatologica Croatica 49, br. 1 (2015): 27-35. https://doi.org/10.15644/asc49/1/4
Harvard
Ledić, K., et al. (2015). 'Analiza parametra translucencije staklokeramike izrađene različitim tehnološkim postupcima', Acta stomatologica Croatica, 49(1), str. 27-35. https://doi.org/10.15644/asc49/1/4
Vancouver
Ledić K, Majnarić I, MILARDOVIĆ ORTOLAN S, Špalj S, Štefančić S, Mehulić K. Analiza parametra translucencije staklokeramike izrađene različitim tehnološkim postupcima. Acta stomatologica Croatica [Internet]. 2015 [pristupljeno 19.09.2020.];49(1):27-35. https://doi.org/10.15644/asc49/1/4
IEEE
K. Ledić, I. Majnarić, S. MILARDOVIĆ ORTOLAN, S. Špalj, S. Štefančić i K. Mehulić, "Analiza parametra translucencije staklokeramike izrađene različitim tehnološkim postupcima", Acta stomatologica Croatica, vol.49, br. 1, str. 27-35, 2015. [Online]. https://doi.org/10.15644/asc49/1/4
Puni tekst: engleski, pdf (336 KB) str. 27-35 preuzimanja: 220* citiraj
APA 6th Edition
Ledić, K., Majnarić, I., MILARDOVIĆ ORTOLAN, S., Špalj, S., Štefančić, S. i Mehulić, K. (2015). Analysis of Translucency Parameter of Glass-Ceramics Fabricated by Different Techniques. Acta stomatologica Croatica, 49 (1), 27-35. https://doi.org/10.15644/asc49/1/4
MLA 8th Edition
Ledić, Karla, et al. "Analysis of Translucency Parameter of Glass-Ceramics Fabricated by Different Techniques." Acta stomatologica Croatica, vol. 49, br. 1, 2015, str. 27-35. https://doi.org/10.15644/asc49/1/4. Citirano 19.09.2020.
Chicago 17th Edition
Ledić, Karla, Igor Majnarić, Slađana MILARDOVIĆ ORTOLAN, Stjepan Špalj, Sanja Štefančić i Ketij Mehulić. "Analysis of Translucency Parameter of Glass-Ceramics Fabricated by Different Techniques." Acta stomatologica Croatica 49, br. 1 (2015): 27-35. https://doi.org/10.15644/asc49/1/4
Harvard
Ledić, K., et al. (2015). 'Analysis of Translucency Parameter of Glass-Ceramics Fabricated by Different Techniques', Acta stomatologica Croatica, 49(1), str. 27-35. https://doi.org/10.15644/asc49/1/4
Vancouver
Ledić K, Majnarić I, MILARDOVIĆ ORTOLAN S, Špalj S, Štefančić S, Mehulić K. Analysis of Translucency Parameter of Glass-Ceramics Fabricated by Different Techniques. Acta stomatologica Croatica [Internet]. 2015 [pristupljeno 19.09.2020.];49(1):27-35. https://doi.org/10.15644/asc49/1/4
IEEE
K. Ledić, I. Majnarić, S. MILARDOVIĆ ORTOLAN, S. Špalj, S. Štefančić i K. Mehulić, "Analysis of Translucency Parameter of Glass-Ceramics Fabricated by Different Techniques", Acta stomatologica Croatica, vol.49, br. 1, str. 27-35, 2015. [Online]. https://doi.org/10.15644/asc49/1/4

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Sažetak
Svrha: Analizirati parametar translucencije (TP vrijednosti) staklokeramika izrađenih različitim tehnološkim postupcima te ispitati kako na TP vrijednosti utječu korozivna sredstva. Materijali i metode: Izrađena su po tri uzorka IPS e.max keramike (Ivoclar Vivadent, Schaan, Lihtenštajn) u trima bojama (A2, C2 i B3) s trima različitim tehnologijama izrade (slojevanje – e.max Ceram Dentin; toplo-tlačna tehnika – e.max Press; strojno – e.max CAD). Uzorci su bili u obliku pločica dimenzija 10 mm x 12 mm x 0,8 mm. Spektrofotometrom (X-Rite DTP 20 Pulse, Neu Isenburg, Njemačka) izmjerene su CIE L*a*b* vrijednosti za izračun parametra tanslucencije (TP vrijednost) prije i poslije izlaganja 4-postotnoj octenoj kiselini na 80 °C tijekom 16 sati (ISO 6872). Statistički podatci obrađeni su programom IBM SPSS 22. Rezultati: Značajno najmanje TP vrijednosti imao je IPS e.max Ceram Dentin, a najveće IPS e.max Press u svim bojama, prije i poslije izlaganja kiselini (p<0,001). Razlika u TP vrijednostima između boja bila je vidljiva unutar materijala IPS e.max Ceram Dentin prije i poslije izlaganja kiselini, uz veliku snagu efekta (p<0,001; η2 = 0,702 i 0,741) te pri primjeni materijala IPS e.max Press (p<0,001, snaga efekta 0,547 i 0,576). Strojno izrađeni uzorci pokazali su ujednačene TP vrijednosti. Izlaganje korozivnom sredstvu nije rezultiralo statistički značajnim promjenama TP vrijednosti ni za jedan materijal. Zaključak: Različite staklokeramike pokazale su značajne razlike u TP vrijednostima i prema tehnološkom postupku izrade i prema različitim bojama. Izlaganje korozivnom sredstvu nije rezultiralo statistički značajnim promjenama TP vrijednosti.

Ključne riječi
staklokeramika; spektrofotometrija; optičke pojavnosti; hrđanje; octena kiselina; propuštanje svjetla

Hrčak ID: 136858

URI
https://hrcak.srce.hr/136858

▼ Article Information



Introduction

Aesthetics has become a primary criterion for successful fixed prosthodontics treatment, especially regarding restoration of the front teeth. The aim of aesthetic dentistry is to create a restoration which does not differ in colour from natural teeth (1, 2). Therefore, optical properties of restorative materials are of exceptional importance. In dental prosthodontics, ceramic materials are considered superior materials to composites from the aesthetical point of view because of their excellent optical properties (3).

The colour and appearance of teeth is a complex phenomenon which includes a number of factors (4-6). Natural teeth are not of a uniform structure and are characterised by different colour and grades of translucency from the cervical to the incisal part. Translucency is the relative amount of passage of light through an object (1). Translucency of the restorative material gives natural appearance and vitality to the restoration. Therefore, in order to achieve optimum aesthetic results, in addition to mimicking the colour of natural teeth, it is equally important to mimic their translucency (2).

Translucency of dental ceramics depends on the interaction between the ceramic material and the incident light. Mixed white light on the surfaces of a ceramic crown conducts itself in accordance with the physical laws of reflection and refraction because of different optical densities of these two media. Thus, a part of the light is reflected and a part is refracted and passes through the other medium. If a smaller amount of light is reflected, and a greater part passes through (is refracted), the restoration will be transparent. The amount of light that is absorbed, reflected or transmitted depends on the relations between incident light wave lengths and the size and the number of particles (7-10). When the material is absolutely turbid (opaque), translucency (TP value) is about zero. Consequently, the higher the TP value the greater the translucency of a material (11, 12).

Glass-ceramics is a material that mimics dental tissue to a great extent, and has the best optical properties among all prosthetic materials (13). The advantage of glass-ceramic over other restorative materials is its translucency, which allows the passage of light in the same way as in natural teeth. It was created by developing silicate ceramics by procedures of controlled glass crystallisation. It is characterised by great mechanical resistance, hardness and stability to temperature changes (14). The fabrication of glass-ceramic restorations is based on the fabrication of the entire restoration from the same material or fabrication of the core and layers of veneering ceramics. The core is more or less translucent, but does not have much similarity with natural teeth (15). Glass-ceramic restorations can be fabricated in a dental laboratory by using three fundamental techniques – layering, heat-pressing and computer-aided design and computer-aided manufacturing (CAD/CAM) (16). The quality of a ceramic material depends on its components; type and amount of glass matrix and the type, amount, size and distribution of grains, techniques of fabrication and treatment of the restoration, and cycles and temperature of firing and cooling (6, 17). Since properties of any material are in the function of its structure, errors occurring during the fabrication or treatment of the restoration in the dental laboratory will make the microstructure of ceramics irregular and will result in unwanted effects (14).

Apart from the properties of the restorative material itself, the environment, i.e. the oral cavity, also affects the stability of the restoration. In this context it should be stressed that restorative materials and restorations should possess long-term stable optical properties in the oral cavity. Continuous exposure to an aqueous medium, pH changes due to the intake of various beverages and foods and changes elicited by agents for cleaning of the oral cavity combined with dynamic loads, cause tribocorrosion changes on the surface of the restoration. Corrosion in the mouth, besides being a form of electrochemical corrosion and galvanism, also represents corrosion caused by acid products of microorganisms. The greater the share of the glass matrix, the greater the effect of corrosion processes and the deterioration of the restoration has been reported (18, 19).

Contemporary dental materials are subject to control and biocompatibility testing in accordance with European and American standards. However, all controls do not absolutely guarantee the stability of the material in the mouth. Ceramics is considered to be a material resistant to corrosion, i.e. a biologically inert material, however, no material is completely inert (20, 21).

The purpose of this study was, with the aid of a spectrophotometer, to quantitatively measure and compare optical properties of translucency (TP values) on three types of glass-ceramic specimens in three different colours fabricated by three different techniques before and after exposure to a corrosive medium, 4% acetic acid (ISO 6872) (22).

The following research hypotheses were tested:

  1. TP values of glass-ceramics depended on the fabrication technique.

  2. TP values of glass-ceramics fabricated by the same technique depended on the colour.

  3. Corrosion influenced changes in TP values.

Materials and procedures

Nine specimens of IPS e.max glass-ceramics (Ivoclar Vivadent, Schaan, Liechtenstein) were made in the form of plates with dimensions 10 mm x 12 mm x 0.8 mm ± 0.05 mm in three colours (A2, C2, B3). The tested glass-ceramics specimens are presented in Table 1. IPS e.max Press ingots and IPS e.max CAD ceramics blocks were fabricated in HT (high translucency).

Table 1 Layout of tested glass-ceramics
        Trade mark        Glass-ceramics type        Fabrication technique        Number of specimens
        IPS e.max Press        lithium-disilicate        heat-pressing technique        3
        IPS e.max CAD        CAD/CAM        3
        IPS e.max Ceram Dentin        nano-fluorapatite        layering technique        3

All specimens were prepared by the same dental technician by standard procedures in accordance with the manufacturer’s directions. IPS e.max Press specimens were made by using wax models, which were, after firing, pressed in moulds by the technique of heat-pressing of ingots. IPS e.max Ceram Dentin specimens were made by powder condensation technique, by manual mixing of the ceramic powder with distilled water and firing (Programat EP 5000, Ivoclar Vivadent, Schaan, Liechtenstein). IPS e.max CAD specimens were made from factory-made blocks with the use of a milling machine (Amann Girrbach Ceramill Motion 2, Koblach, Austria).

After preparation, unglazed specimens were polished to obtain a smooth and even surface by using polishers, rubbers and silicon carbamide discs (Komet Dental, Gebr. Brasseler GmbH & Co. KG, Lemgo, Germany) and were ultrasonically washed and cleaned in distilled water for 15 minutes (ISO 3696).

In the first part of the study, measurements of CIE L*a*b* values of glass-ceramic specimens in three colours (A2, C2 and B3), fabricated by three different fabrication techniques were determined. L* represents the lightness/darkness of a colour, a* is a measure of redness (positive) or greenness (negative) and b* is a measure of yellowness (positive) or blueness (negative). Measurements were conducted instrumentally by using a calibrated spectrophotometer and colorimeter X-Rite DTP 20 Pulse (45°/0°measuring geometry, 2°standard observer, illuminant D65). The numerical TP value is based on the CIE L*a*b* three-dimensional system and represents the difference in colour of a specific specimen measured on achromatic backgrounds. Consequently, two series of measurements were conducted (measurement of specimens against standard white background, and measurement of the same specimens against standard black background). Ten measurements on each of nine different plates were made against each background, changing the position of the measuring instrument (spectrophotometer) at five different places first on one and then on the other side of the surface of the specimen. Measurements were monitored by ColorShop X software integrated into the X-Rite spectrophotometer). After measuring CIE L*a*b* values, the numerical value of translucency parameter was calculated in accordance with the following equation:

TP= [(L*w-L*b)2 + (a*w-a*b)2 + (b*w-b*b)2]1/2

All specimens were then exposed to 4% acidic acid at 80 °C for 16 hours (ISO 6872). Following exposure to the corrosive medium, measurements of the TP values were repeated as described in the first part.

Statistical analysis

The normality of the distribution was verified by the Shapiro-Wilk test. In order to compare the differences in TP values between different types of materials and colours, one-way analyses of variance (ANOVA) with the Student-Newman-Keuls post-hoc test were used. In order to compare TP values before and after exposure to acid, a mixed type of two-way ANOVA with intervention and material factors and three-way ANOVAs with intervention, material and colour factors and t-tests for dependent specimens were used for the assessment of differences within each material and each colour. Effect sizes were quantified by η2, and for dependent specimens using the equation r = √(t2/t2+df). Statistical data were analysed by IBM SPSS 22 software. The level of significance was set at p < 0.05.

Results

Table 2 shows the comparison between TP values of glass-ceramics of different colours fabricated by different fabrication techniques before and after exposure to acetic acid.

Table 2 Comparison of translucency before and after corrosion among materials of the same colour; t0 = translucency before exposure to corrosive medium; t1 = translucency after exposure to corrosive medium
        AS±SD        p*        η2
        Translucency t0        A2        IPS e.max Ceram Dentin        7.58±0.92a
        IPS e.max Press        16.50±0.33b
        IPS e.max CAD
        14.17±0.85c
        <0.001
        0.966
        C2        IPS e.max Ceram Dentin        8.61±0.34a
        IPS e.max Press        17.53±0.50b
        IPS e.max CAD
        13.87±1.17c
        <0.001
        0.963
        B3        IPS e.max Ceram Dentin        9.69±0.30a
        IPS e.max Press        17.58±0.58b
        IPS e.max CAD
        14.27±0.50c
        <0.001
        0.981
        Translucency t1        A2        IPS e.max Ceram Dentin        7.50±0.69a
        IPS e.max Press        16.18±0.30b
        IPS e.max CAD
        13.95±0.68c
        <0.001
        0.978
        C2        IPS e.max Ceram Dentin        8.62±0.41a
        IPS e.max Press        17.52±0.68b
        IPS e.max CAD
        13.87±1.33c
        <0.001
        0.949
        B3        IPS e.max Ceram Dentin        9.62±0.48a
        IPS e.max Press        17.47±0.62b
        IPS e.max CAD        13.75±0.36c        <0.001        0.979

*ANOVA and Student-Newman-Keuls post-hoc test. Types of materials which have different letters in the exponent have a statistically significant difference within the same colour.

IPS e.max Ceram Dentin had significantly the lowest TP, and IPS e.max Press the highest TP values (in all colours before and after exposure to acid p < 0.001).

The difference in TP values among colours was evident in IPS e.max Ceram Dentin material, both before and after exposure to acid with a great effect size (p < 0.001; η2 = 0.702 and 0.741) and in IPS e.max Press material (p < 0.001 with effect size 0.547 and 0.576). The IPS e.max Ceram Dentin colour A2 had significantly the lowest and the colour B3 the highest TP values, both before and after exposure to acid. The IPS e.max Press colour A2 had significantly lower TP than the colour C2 and the colour B3, both prior and after exposure to acid. No significant difference was observed between the colour C2 and the colour B3. Using the material IPS e.max CAD the differences among colours were not statistically significant either before or after exposure to acid (Table 2).

Analysis of the effect of corrosion

The two-way ANOVA did not show a significant interaction of the corrosion test and the material tested with respect to TP values. The three-way ANOVA did not detect a significant interaction of the corrosion test, the material used and the colour with respect to TP values.

Acid caused a significant reduction in TP values only in the IPS e.max CAD specimen colour B3 (p = 0.006) with the effect size of 58% (Figure 1).

Figure 1 Comparison of translucency before and after exposure to acid with respect to material and colour
ASC_49(1)_27-35-f1

The amount of change of TP values due to the exposure in acid was almost equal in all colours (Figure 2).

Figure 2 Comparison of the amount of change in translucency due to exposure to acid between materials and colours
ASC_49(1)_27-35-f2

Discussion

Research hypotheses have been accepted. By reviewing the relevant literature, translucency of ceramic materials, which is a very important property for the aesthetic appearance of materials, has not been thoroughly investigated. The knowledge of optical properties of specific restorative materials makes their use in the clinical practice easier. Thus, the aim of this paper was to contribute to the clarification of this complex issue. Ceramics covering the indications from fabrication of thin veneers to fixed partial dentures were tested. Technological durability and long-term stable optical properties of the restoration depend on the mechanical properties of the material which are determined by its composition and microstructure, the course of fabrication in a dental laboratory, the quality of the finishing treatment of the restoration, the connective agent and the quality of the entire fabrication procedure (3, 23, 24). It is considered that the layering technique is liable to greatest errors because of the human factor and possible oversights in manual procedures.

Statistically significant differences among glass-ceramics fabricated by different techniques were recorded in this study; therefore the first research hypothesis is accepted. The specimen made by heat-pressing technique (IPS e.max Press) had the greatest TP values, which is in accordance with a research conducted by Bagis et al. (12). However, those authors stated that specimens fabricated by computer-aided manufacturing (IPS e.max CAD) had the lowest TP values, whereas in this study the lowest TP values were measured in the specimen fabricated by the layering technique (IPS e.max Ceram Dentin). This can be explained by the fact that e.max Press ingots and e.max CAD ceramics blocks were selected in the high translucency (HT), whereas e.max Ceram Dentin was optically relatively thick. However, a similarity is observed in the fact that glass-ceramics fabricated by computer-aided manufacturing showed lower TP values than glass-ceramics fabricated by heat-pressing technique.

Significant differences were observed in this study by analysing the TP values of specimens of different colours fabricated by the same technique; therefore the second research hypothesis is accepted. It was established that specimens fabricated by the layering technique and heat-pressing technique showed deviations in TP values, in contrast to the specimens fabricated by computer-aided manufacturing which showed no difference, both before and after exposure to corrosion. Specimens fabricated by the layering technique showed the lowest TP values in all colours. Specimens of the colour A2 had the lowest TP values, whereas TP values of the colour B3 were the greatest. Among specimens fabricated by the heat-pressing technique, the colour A2 again showed the lowest TP values, whereas the colours C2 and B3 showed the same values. Specimens fabricated by computer-aided manufacturing did not show difference of TP values of different colours.

The layering technique is liable to greatest variations because ceramic powder is manually mixed with the liquid. The final condensation is conditioned by the size of the ceramic grain, the amount of the liquid introduced during modelling and the condensation technique itself. Thus, great differences in the final product from one technician to another may occur. Condensation procedures have a significant effect on optical and mechanical properties of the ceramic material. Chu et al. emphasised that the precise ceramic powder/liquid ratio in accordance with the manufacturer’s directions does not always ensure proper thickness and porosity and consequently the translucency or opacity of the restoration (25). The importance of the chemical structure of the components and the size of crystals inserted in the glass matrix is also emphasised (8).

In contrast to the layering technique, factory-made semi-finished products (IPS e.max Press ceramic ingots or IPS e.max CAD blocks for milling) are structurally more stable. Their ceramic particles were pressed in the factory under high temperature and pressure which results in a very thick material with a homogeneous microstructural picture (12).

Wang found out that the translucency of the glass-ceramics restoration is significantly affected by the type and thickness of the veneering dental ceramics. Translucency of dental ceramics increases exponentially with reduced thickness (7). Lim showed comparable values of translucency measured by a spectrophotometer (higher TP values) and by spectroradiometer (26). Other authors bring into correlation the translucency of dental ceramics with illumination (27, 28), the impact of glazed/unglazed surface of glass-ceramics (29) and the impact of the cement and the colour of the prepared tooth (30).

By artificial exposure of specimens to a corrosive medium an insight is gained into the stability of glass-ceramics and the stability of the translucency property in the oral cavity compromised by corrosion in a significantly more rapid and simpler manner than in in vivo studies. The use of acetic acid is justified for more reasons; it is often used in households, its pH (2.4) is very similar to that of some beverages, and such pH is also present in the areas below plaque. Such lower pH is also often present in the mouth of patients suffering from stomach diseases.

It is known that, because of the effect of the corrosive medium on the ceramic restoration there is a disruption of bonds in the fundamental structural units of glass, silica tetrahedrons, which means that a greater amount of glass matrix in the material with the same corrosive effect of the environment results in greater corrosion. Blocks for computer-aided manufacturing contain significantly much less glass matrix than ceramics used in the layering technique and are therefore chemically more stable (31-33). However, the effect of the acid on translucency of glass-ceramics was not statistically significant in this study for any of the fabrication techniques; therefore the third research hypothesis is rejected. The results are in accordance with the results obtained by other authors (12, 22). A conclusion can be made that ceramic materials are chemically stable. Some studies bring into relation the appearance of roughness on the surface of the restoration resulting from long-term exposure to acid medium and consequent changes in the optical properties (21, 28). However, additional research on this complex topic is needed.

Conclusion

Under the limitation of this study, it was concluded that different types of glass-ceramics showed significant differences in TP values, both with respect to the fabrication technique and with respect to colour. Exposure to a corrosive medium did not result in a statistically significant change in TP values. Thus, glass-ceramics fabricated by all fabrication techniques showed excellent chemical stability.

Acknowledgements

This paper was prepared within the framework of the scientific research project „Research of ceramic materials and allergies in dental prosthetics“(065-0650446-0435) (MSES) and the university support “Research of new ceramic materials and fabrication techniques in dental prosthetics”.

Notes

[1] Conflicts of interest None to declare

References

1 

Brodbelt RH, O’Brien WJ, Fan PL. Translucency of dental porcelains. J Dent Res. 1980 Jan;59(1):70–5. DOI: http://dx.doi.org/10.1177/00220345800590011101 PubMed: http://www.ncbi.nlm.nih.gov/pubmed/6927988

2 

Yu B, Ahn JS, Lee YK. Measurement of translucency of tooth enamel and dentin. Acta Odontol Scand. 2009;67(1):57–64. DOI: http://dx.doi.org/10.1080/00016350802577818 PubMed: http://www.ncbi.nlm.nih.gov/pubmed/19037822

3 

Mehulić K. Keramički materijali u stomatološkoj protetici. Zagreb: Školska knjiga; 2010.

4 

Kelly JR. Dental ceramics: current thinking and trends. Dent Clin North Am. 2004 Apr;48(2):viii, 513–30. PubMed: http://www.ncbi.nlm.nih.gov/pubmed/15172614

5 

Živko-Babić J, Mehulić K, Ivaniš T, Predanić-Gašparac H. Pregled pojedinih keramičkih sustava. I Dio: Povijesni prikaz keramike. Acta Stomatol Croat. 1994;28:217–21.

6 

Mehulić K, Živko-Babić J, Ivaniš T, Kustec-Pribilović M, Predanić-Gašparac H. Glass-ceramics in fixed prosthodonticsStaklokeramika u fiksnoj protetici- Dicor i Empress. Acta Stomatol Croat. 1997;31(2):149–55.

7 

Wang F, Takahashi H, Iwasaki N. Translucency of dental ceramics with different thicknesses. J Prosthet Dent. 2013 Jul;110(1):14–20. DOI: http://dx.doi.org/10.1016/S0022-3913(13)60333-9 PubMed: http://www.ncbi.nlm.nih.gov/pubmed/23849609

8 

Zhang Y, Griggs JA, Benham AW. Influence of powder/liquid ratio on porosity and translucency of dental porcelains. J Prosthet Dent. 2004 Feb;91(2):128–35. DOI: http://dx.doi.org/10.1016/j.prosdent.2003.10.014 PubMed: http://www.ncbi.nlm.nih.gov/pubmed/14970758

9 

Kim JH, Lee JK, Powers JM. Influence of a series of organic and chemical substances on the translucency of resin composites. J Biomed Mater Res B Appl Biomater. 2006 Apr;77(1):21–7. DOI: http://dx.doi.org/10.1002/jbm.b.30401 PubMed: http://www.ncbi.nlm.nih.gov/pubmed/16184537

10 

Suvin M. Fiksna protetika. Zagreb: Školska knjiga; 1987.

11 

Johnston WM, Ma T, Kienle BH. Translucency parameter of colorants for maxillofacial prostheses. Int J Prosthodont. 1995 Jan-Feb;8(1):79–86. PubMed: http://www.ncbi.nlm.nih.gov/pubmed/7710631

12 

Bagis B, Turgut S. Optical properties of current ceramics systems for laminate veneers. J Dent. 2013 Aug;41 Suppl 3:e24–30. DOI: http://dx.doi.org/10.1016/j.jdent.2012.11.013 PubMed: http://www.ncbi.nlm.nih.gov/pubmed/23201410

13 

Davis MJ. Practical aspects and implications of interfaces in glass-ceramics: A review. Int J Mater Res. 2008;99:120–8. DOI: http://dx.doi.org/10.3139/146.101599

14 

Isgrň G, Kleverlaan CJ, Wang H, Feilzer AJ. The influence of multiple firing on thermal contraction of ceramic materials used for the fabrication of layered all-ceramic dental restorations. Dent Mater. 2005 Jun;21(6):557–64. DOI: http://dx.doi.org/10.1016/j.dental.2004.08.006 PubMed: http://www.ncbi.nlm.nih.gov/pubmed/15904699

15 

Rosenblum MA, Schulman A. A review of all-ceramic restorations. J Am Dent Assoc. 1997 Mar;128(3):297–307. DOI: http://dx.doi.org/10.14219/jada.archive.1997.0193 PubMed: http://www.ncbi.nlm.nih.gov/pubmed/9066214

16 

Höland W. Beall, GH - editors. Glass-Ceramic Technology. 2nd ed. New York: Society/Wiley; 2010.

17 

Barăo VA, Gennari-Filho H, Goiato MC, Dos Santos DM, Pesqueira AA. Factors to achieve aesthetics in all-ceramic restorations. J Craniofac Surg. 2010 Nov;21(6):2007–12. DOI: http://dx.doi.org/10.1097/SCS.0b013e3181f535d4 PubMed: http://www.ncbi.nlm.nih.gov/pubmed/21119487

18 

Anusavice KJ. Degradability of dental ceramics. Adv Dent Res. 1992 Sep;6:82–9. PubMed: http://www.ncbi.nlm.nih.gov/pubmed/1292468

19 

Jakovac M, Zivko-Babic J, Curkovic L, Aurer A. Chemical durability of dental ceramic material in acid medium. Acta Stomatol Croat. 2006;40(1):65–71.

20 

Stanley HR. Biological evaluation of dental materials. Int Dent J. 1992 Feb;42(1):37–46. PubMed: http://www.ncbi.nlm.nih.gov/pubmed/1563821

21 

Milleding P, Karlsson S, Nyborg L. On the surface elemental composition of non-corroded and corroded dental ceramic materials in vitro. J Mater Sci Mater Med. 2003 Jun;14(6):557–66. DOI: http://dx.doi.org/10.1023/A:1023416232222 PubMed: http://www.ncbi.nlm.nih.gov/pubmed/15348440

22 

23 

Raigrodski AJ, Chiche GJ. The safety and efficacy of anterior ceramic fixed partial dentures: A review of the literature. J Prosthet Dent. 2001 Nov;86(5):520–5. DOI: http://dx.doi.org/10.1067/mpr.2001.120111 PubMed: http://www.ncbi.nlm.nih.gov/pubmed/11725280

24 

Esquivel-Upshaw JF, Chai J, Sansano S, Schonberg D. Resistance to staining, flexural strength and chemical solubility for all ceramic crowns. Int J Prosthodont. 2001 May-Jun;14(3):284–8. PubMed: http://www.ncbi.nlm.nih.gov/pubmed/11484579

25 

Chu FC, Chow TW, Chai J, Law D. Contrast ratios and masking ability of three types of ceramic veneers. J Prosthet Dent. 2007 Nov;98(5):359–64. DOI: http://dx.doi.org/10.1016/S0022-3913(07)60120-6 PubMed: http://www.ncbi.nlm.nih.gov/pubmed/18021824

26 

Lim HN, Yu B, Lee YK. Spectroradiometric and spectrophotometric translucency of ceramic materials. J Prosthet Dent. 2010 Oct;104(4):239–46. DOI: http://dx.doi.org/10.1016/S0022-3913(10)60131-X PubMed: http://www.ncbi.nlm.nih.gov/pubmed/20875528

27 

Ahn JS, Lee YK. Difference in the translucency of all-ceramics by the illuminant. Dent Mater. 2008 Nov;24(11):1539–44. DOI: http://dx.doi.org/10.1016/j.dental.2008.03.020 PubMed: http://www.ncbi.nlm.nih.gov/pubmed/18452985

28 

Heffernan MJ, Aquilino SA, Diaz-Arnold AM, Haselton DR, Stanford CM, Vargas MA. Relative translucency of six all-ceramic systems. Part II. Core and veneer materials. J Prosthet Dent. 2002 Jul;88(1):10–5. DOI: http://dx.doi.org/10.1067/mpr.2002.126795 PubMed: http://www.ncbi.nlm.nih.gov/pubmed/12239473

29 

Milleding P, Wennerberg A, Alaeddin S, Karlsson S, Simon E. Surface corrosion of dental ceramics in vitro. Biomaterials. 1999 Apr;20(8):733–46. DOI: http://dx.doi.org/10.1016/S0142-9612(98)00223-3 PubMed: http://www.ncbi.nlm.nih.gov/pubmed/10353656

30 

Milardović Ortolan S. Utjecaj biološke osnove, optičkih svojstava i debljine gradivnih i fiksacijskih materiala na boju nadomjeska od litij-disilikatne staklokeramike [dissertation]. Zagreb: Stomatološki fakultet Sveučilišta u Zagrebu; 2014.

31 

Paravina RD. Evaluation of a newly developed visual shade matching apparatus. Int J Prosthodont. 2002 Nov-Dec;15(6):528–34. PubMed: http://www.ncbi.nlm.nih.gov/pubmed/12475156

32 

Fondriest J. Shade matching in restorative dentistry; The science and strategies. Int J Periodontics Restorative Dent. 2003 Oct;23(5):467–79. PubMed: http://www.ncbi.nlm.nih.gov/pubmed/14620121

33 

Gurel G. The Science and Art of Porcelain Laminate Veneers. 2 nd ed. London: Quintessence Publishing; 2003.


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