List of Articles by MeSH

DENTAL RESTORATION WEAR

1. Jakovac M, Živko-Babić J, Ćurković L, Carek A. Chemical Durability of Dental Ceramic Material in Acid Medium. Acta Stomatol Croat. 2006;40(1):65-71.
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   Title in English:	Chemical Durability of Dental Ceramic Material in Acid Medium
   Title in Croatian:	Kemijska postojanost dentalnih keramika u kiselom mediju
   Type of Article:	original scientific paper
   MeSH:	DENTAL RESTORATION WEAR DENTAL MATERIALS CERAMICS
   Abstract:	Dental materials need to be thoroughly examined in order to assess their long-term therapeutical value. Chemical degradation of dental ceramic material enhances its roughness, leading to the wear of the opposing natural tooth or restorative material, greater plaque attachment to ceramics, weakening of the ceramic structure causing the critical ion exchange at the surface and enhancing the sensitivity to future chemical agents. The aim of this study was to test loss of mass in samples of four different dental ceramic materials in an acid medium. The least mass loss was recorded in apatite glass ceramic (IPS-Empress 2 for layering) (4.9±0.3 μg/cm2), and most mass loss was recorded in alumina ceramic (Vitadur alpha) (15±0.2 μg/cm2). Lithium disilicate glass ceramic (IPS-Empress 2 for coloring) and alumina (IPS-Classic) showed very similar results (9.4±3.4 μg/cm2 and 10.1±0.3 μg/cm2). The values of mass loss in samples in this work, as well as in the most of the literature, are minimal and presumably do not have any clinical or toxicological effects. However, it does not imply that these values can be generalized and transferred to dental ceramic materials that were not yet analyzed.

2. Mehulić K, Čvrljak-Tomić I, Schauperl Z, Komar D. Wear Characteristics of Esthetic Prosthetic Materials. Acta Stomatol Croat. 2006;40(1):56-64.
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   Title in English:	Wear Characteristics of Esthetic Prosthetic Materials
   Title in Croatian:	Tribološka svojstva estetskih protetskih materijala
   Type of Article:	original scientific paper
   MeSH:	DENTAL RESTORATION WEAR DENTAL MATERIALS CERAMICS POLYMERS
   Abstract:	Knowledge of wear characteristics of esthetic prosthetic materials is essential in everyday dental practice. To establish a new, original, method and produce a device for examining wear characteristics of constructive prosthetic materials, to assess the wear characteristics of different esthetic prosthetic materials and to examine the relationship in a wear pair: natural tooth - prosthetic material. The study was performed on a modified device Taber abraser on samples of six different esthetic prosthetic materials. The wear is smallest for samples of alumina ceramics (Creation and d.Sign), and greatest for polymer (Chromasit) and ceromer material (Targis). The smallest wear factors were established for alumina ceramics as well. The study has resulted in the development of a new method and new device for examining the wear characteristics of prosthetic materials.

3. Mehulić K, Schauperl Z, Čvrljak-Tomić I, Badel T. A Method for Testing Abrasive Weare of Aesthetic Prosthetic Materials. Acta Stomatol Croat. 2005;39(2):171-80.
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   Title in English:	A Method for Testing Abrasive Weare of Aesthetic Prosthetic Materials
   Title in Croatian:	Metoda za ispitivanje abrazijskoga trošenja estetskih protetskih materijala
   Type of Article:	preliminary report
   MeSH:	DENTAL RESTORATION WEAR CERAMICS POLYMERS
   Abstract:	Friction and wear occur due to the contact of surfaces which are more or less rough. During abrasive wear the extrusion of material occurs, caused by hard particles which apply pressure toward the surface or slide along it (three-body abrasive wear) or by hard protrusions (two-body abrasive wear). Because of demands to provide a satisfactory aesthetic mastication surface the clinician is faced with the problem of the choice of material for veneering.The article describes a method for testing abrasive wear of pairs of tooth-prosthetic material for veneering. In order to test the method two different prosthetic veneering materials were tested (polymer material SR Chromasit, Ivoclar and Clay ceramic, Sign-Ivoclar) on a modified Taber abraser, in dry conditions. Significant differences were determined in the wear scars on specimens of the tested materials. The method enables the testing of specimens of different materials mutually or in a pair with a natural tooth, under different loading and with or without a third body (food or artificial saliva), which in clinical practice represents valuable data during the choice of the type of construction and veneering material.

4. Urbanek-Brychczynska M, Hedzelek W, Wasiak W. Quantity Evaluation of the Release of Heavy Metal Ions; Voltamperometric Study. Acta Stomatol Croat. 2002;36(3):348.
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   Title in English:	Quantity Evaluation of the Release of Heavy Metal Ions; Voltamperometric Study
   Title in Croatian:	nema
   Type of Article:	congress abstract
   MeSH:	DENTAL RESTORATION WEAR
   Abstract:	In recent years there has been an decrease in the use of non-precious casting alloys in dentistry. These materials offer many physical, chemical and financial advantages. In order to achieve the necessary mechanical and physical properties, the alloys often contain metals which are known to be biologically active. We have continued and expanded our research into the release of these heavymetal ions by concentrating on the processes that occur when two different alloys are together in the same environment. The aim of this study was to evaluate and compare the influence of one, two or three different non-precious alloys on the degree of release of the selected ions, which are their components. An analysis of the alloys Remanium G-Weich, Remanium CS and Remanium GM 380 was made both individually or in combinations of two samples, which wereprepared from these alloys. One of the metal samples was prepared in the laboratory in the shape of a cylinder from Cr-Ni, Cr-Co, Ag-Pd. The size of the samples, their shape, length and weight were matched. These elements were placed in an incubator of a definite time of permeability and 25 ml of the artificial saliva at a temperature of 37° C was poured. They were then transferred to an incubator at the same temperature and left for 1, 2 ,4, 6, 7 and30 days, after which the released ions Cr, Co, Ni were evaluated by means of inversion voltamperometry.The amount of nickel released into the artificial saliva from chrom-nickel alloys in combination with silver-palladium alloy was increased. The release of chromium andcobalt was detected and depended on the proportion of these ions in the alloy compositions. Exact results are given in tables and diagrams.

5. Ćatović A, Ahmetović A, Ćatić A, Mehulić K. Comparative Investigation of Dynamic Loading Resistance of Teeth with Prefabricated and Cast Metal Posts and Cores. Acta Stomatol Croat. 2002;36(3):347.
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   Title in English:	Comparative Investigation of Dynamic Loading Resistance of Teeth with Prefabricated and Cast Metal Posts and Cores
   Title in Croatian:	nema
   Type of Article:	congress abstract
   MeSH:	POST AND CORE TECHNIQUE DENTAL RESTORATION WEAR
   Abstract:	Loss of a part or complete clinical crown of tooth results in functional and aesthetic impairment of dental arch and complete stomatognathic system. Such teeth, as well as endodontically treated teeth, during reconstructive prosthodontic therapy need to be treated with posts and cores. The aim of the investigation was to measure and compare the dynamic loading resistance of endodonticallytreated teeth with cast metal and prefabricated posts and cores, under dynamic loading fatigue of 800N-1000N, with specific regard to variable root preparation width. The investigation included 48 human lower second premolars of similar dimensions, divided in 4 groupsaccording to type of post and core system (each 6mm long) which they received. 1) prefabricated narrow post and core (Maillefer Switzerland, Size 1) 2) prefabricated wide post and core (Maillefer Switzerland, Size 3B) 3) cast metal narrow post and core 4) cast metal wide post and core. Modified Voss & Meiners dynamic loading tests were performed within a field of 800N-1000N in high frequencypulsator. Teeth with prefabricated narrow posts demonstratedthe highest average dynamic loading resistance of 9.050.622 cycles under 800N until fracture, while teeth with cast metal wide posts demonstrated the lowest average dynamic loading resistance of 3.522.611 cycles under 1000N until fracture. Significant influence of root preparation width on dynamic loading resistance for all typesof posts was determined by ANOVA (p<0.05), with narrow posts demonstrating more fracture resistance. Prefabricated posts and cores demonstrate stable dynamic loading resistance and better intraradicular retention than cast metal posts and cores.

6. Redžepagić S, Berhamović E. Influence of Modern Aggression on Mobile Denture Fractures - Experience from Sarajevo. Acta Stomatol Croat. 2002;36(3):344.
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   Title in English:	Influence of Modern Aggression on Mobile Denture Fractures - Experience from Sarajevo
   Title in Croatian:	nema
   Type of Article:	congress abstract
   MeSH:	DENTAL RESTORATION WEAR
   Abstract:	War is a destructive process. The basic aim of war is destruction as a method of attaining set goals, conquering territories, destruction of societThe consequence of war is destruction at all levels. The destruction as a consequence of war is evident in the field of dental therapy, applied as a therapeutic instrument in the patient's mouth.y and killing people.

7. Lisjak D, Čurković L, Živko-Babić J, Jakovac M. Estimation of Wear Resistance in Acid Solution of Dental Ceramics by Neural Network. Acta Stomatol Croat. 2002;36(3):343.
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   Title in English:	Estimation of Wear Resistance in Acid Solution of Dental Ceramics by Neural Network
   Title in Croatian:	nema
   Type of Article:	congress abstract
   MeSH:	DENTAL RESTORATION WEAR CERAMICS NEURAL NETWORKS
   Abstract:	It is known that exposure to acid causes damage to the glass surface. The aim of this study was to examine wear resistance, measuring the mass change of dental ceramics after contact with 10-3 mol dm-3 HCl at temperature of 50°C. Four samples of dental ceramics were analyzed: feldspatic ceramic, hydrothermal ceramic, glass ceramic for staining and glass ceramic for layering. The mass concentrations of eluted Na+, K+ and Ca2+ were determinedby ion chromatography (IC) and mass concentrations of Si4+ and Al3+ by UV/VIS spectrometry. Measurements were conducted after 1, 2, 3, 6 and 12 months of emersion. For the subject issue, using experimental data, the feedforward backpropagation neural network for estimation of wear resistance of dental ceramics was modelled. The results of 1, 2 and 12 months of emersion were used for the training 13-20-5 model of neural network. Comparison of experimental data and data obtained by estimation (results of 3 and 6 month intervals) of neural network shows that the applied network model provided a very good prediction of wear behavior of dental ceramics with high correlation coefficient (R) and low sum ofsquared error (SSE) between measurement and estimated output values.