Browsing of Articles

1. Batkovski S. The Impact of Sandblasting and Primer on the Bond Between Cements and Metal Framework. Acta Stomatol Croat. 2005;39(4):363-85.
    [details]
    [close]
   Full Text

   Title in English:	The Impact of Sandblasting and Primer on the Bond Between Cements and Metal Framework
   Title in Croatian:	Utjecaj pjeskarenja i veznoga posrednika na svezu cementa s metalnom podlogom
   Type of Article:	original scientific paper
   MeSH:	DENTAL CEMENTS
   Abstract:	Disintegrating the adhesive bridge from the abutment is one of the most uncomfortable consequences for the patient, and especially for the therapeutist, as it arises a question on the justifiability of the applied method. The success of these appliances depends on the design of the metal skelet, the strenght of the cement itself, as well as its bonding with the etched enamel and the dental alloy. However, because of the weak affinity of one material to the other and higher strain at the interface cement-alloy, the bond cement-alloy is weak.The aim of the undertaken investigation was to identify which combinations of sandblasting and primer achieve maximum torque strength values of the bond between cement and corresponding Ag-Pd part of sample.In order to minimize the number of variables in the experiment, so that the strength of the bond cement-alloy represents a real indicator of the efficiency of the cement bond on the metal sample, the metal-cementmetal test model was used. 180 completely equal metal samples were tested, divided in groups and subjected to various methods of conditioning. Bonding strength values obtained through various combinations of mechanical chemical type of bonds of three kinds of cement with Ag- Pd alloy were tested, while structural investigations of the break area were accomplished by means of the polarizing microscope and the microanalyzer of the view. The bonding strength values of the cement-alloy bond were determined by measuring the load at the instant of the bond break. The results were statistically analyzed by three-way variance analysis, and then processed by one-way variance analysis and/or compared by means of the Tukey test. The active group of the V-Primer and the functional monomers of Panavia 21 and Super-Bond improved the characteristics of the bond of adhesive cements on the semi-precious surface, sandblasted by abrasives, while the worst results and adhesive breaks characterise ABC cement.

2. Kraljević M, Šegović S, Badel T, Simeon P. Periapical Status of Endodontically Treated Teeth in Relations to the Quality of the Coronal Restoration. Acta Stomatol Croat. 2005;39(4):387-98.
    [details]
    [close]
   Full Text

   Title in English:	Periapical Status of Endodontically Treated Teeth in Relations to the Quality of the Coronal Restoration
   Title in Croatian:	Periapeksni status endodontski liječenih zubi s obzirom na kakvoću poslijeendodontskoga restaurativnog nadomjestka
   Type of Article:	original scientific paper
   MeSH:	ROOT CANAL THERAPY ROOT CANAL OBTURATION RADIOGRAPHY, PANORAMIC
   Abstract:	The purpose of this study was to evaluate the relationship of the quality of the postendodontic restoration and root canal obturation on the radiographic periapical status of endodontically treated teeth. Panoramic adiographs of randomly selected patients from the Department of Endodontics and Restorative Dentistry and the Department of Periodontology, School of Dental Medicine in Zagreb, were examined. Six hundred and ninety-six endodontically treated teeth from 265 panoramic radiographs were evaluated independently by two examiners. According to a predetermined radiographic set of criteria, the technical quality of the root filling of each tooth was scored as either good or poor, and the quality of the postendodontic restoration similarly good or poor. The apical one-third of the root and surrounding structures were then evaluated radiographically and the periapical status categorized as absence (API) or presence (PPI) of periradicular inflammation. The rate of API for all endodontically treated teeth was 45%. Good endodontic filling (GE) resulted in significantly more API cases than good postendodontic restoration (GR), 89% versus 68%. Poor endodontic filling (PE) resulted in slightly more PPI cases than poor postendodontically restoration (PR), 81% versus 79%. The combination of GE and GR had the highest API rate of 94%, significantly higher than PE and PR, with API rate of 14%. Differences among groups regarding the technical quality of the root filling, and the quality of the postendodontic restoration were statistically significant (p< 0.05).

3. Škrinjarić I, Glavina D. Autotransplatation of Premolars to the Position of Central Maxillary Incisors: Evaluation After 10-Year Follow-Up. Acta Stomatol Croat. 2005;39(4):399-414.
    [details]
    [close]
   Full Text

   Title in English:	Autotransplatation of Premolars to the Position of Central Maxillary Incisors: Evaluation After 10-Year Follow-Up
   Title in Croatian:	Autotransplantacija premolara na mjesto gornjih središnjih sjekutića: ocjena nakon 10 godina praćenja
   Type of Article:	original scientific paper
   MeSH:	BICUSPID INCISOR TRANSPLANTATION TOOTH INJURIES + therapy
   Abstract:	Autotransplantation of premolars to replace lost maxillary incisors in young patients can ensure restoration of normal function and aesthetics. However, there is a need to evaluate the function and aesthetic appearance of the transplanted teeth after a long period. The purpose of this study was to evaluate the success of treatment and aesthetic appearance of transplanted premolars after follow-up of 9 to 13 years. The intention was also to assess whether the transplantation procedure can give predictable functional and aesthetic results after long-term intraoral use. The study was performed on 10 patients with teeth transplanted to the position of the upper central incisors. At the time of transplantation the patients were aged between 9 and 14 years (mean 12 years). They were all treated in the Department of Paediatric Dentistry, School of Dental Medicine. After transplantation all the teeth were immobilised with a wire-composite splint for two weeks, and reshaped with composite after three months. The reshaped teeth were compared with the contralateral incisors with regard to morphology, colour and overall aesthetics. Follow-up of the treatment ranged from 9 to 13 years (average 10.5 years). Transplantation outcome was assessed on the basis of clinical, radiographic and aesthetic criteria. Patients were given a visual analogous scale to assess their overall satisfaction with the treatment outcome. Aesthetic outcome was classified in three categories: 1. Match (difference less than 0.5 mm), 2. Deviation (difference from 0.5 to 1.5 mm) and 3. Mismatch (difference greater than 1.5 mm). The results showed that all the teeth survived without signs of root resorption and ankylosis, although endodontic treatment was performed in 70% of the teeth. Aesthetic appearance after the initial reshaping was classified as matched in all cases and in 80% of cases after 9 to 12.5 years. The study showed that the overall satisfaction of patients with the outcome of treatment was very high (VAS = 87.1). Transplantation of premolars to the position of incisors represents a safe method of treatment which gives highly predictable functional and aesthetic results.

4. Negovetić Vranić D, Tarle Z, Škrinjarić K, Glavina D, Škrinjarić I. Clinical Analysis of Compomer Restorations in Primary Dentition: 2-Year Evaluation. Acta Stomatol Croat. 2005;39(4):415-26.
    [details]
    [close]
   Full Text

   Title in English:	Clinical Analysis of Compomer Restorations in Primary Dentition: 2-Year Evaluation
   Title in Croatian:	Klinička raščlamba ispuna kompomerima u mliječnoj denticiji: 2-godišnja ocjena
   Type of Article:	original scientific paper
   MeSH:	DENTAL MATERIALS DENTAL AMALGAM COMPOMERS
   Abstract:	Various materials are available as alternatives to amalgam for restorations in primary teeth. The aim of the study was to evaluate the clinical performance of two compomers: Hytac and Compoglass in class II restorations in primary teeth, as an alternative to amalgam. Seventynin second class cavities (60 patients) in primary molars were restored with amalgam (Vivadent/Ivoclar, Schaan, Liechtenstein, LOT 819798) (24 restorations), Compoglass (Vivadent/Ivoclar, Schaan, Liechtenstein LOT 819798) (24 restorations) and Hytac (3M Espe, Seefeld, Germany LOT 012) (26 restorations). Each material was placed by using the respective adhesive system in accordance with the manufacturer’s instructions. Restorations were evaluated immediately after placement and after 6 months, one year and two years by using modified USPHS (Ryge & Cvar) criteria. After two years colour evaluation rate A was recorded in 79% of cases with compomer restorations with Compoglass and 80% for compomer restorations with Hytac. Marginal adaptation for amalgam restorations was evaluated as rate A in 62.5%, rate B in 33.3% and rate D in 4.2%, while for compomer restorations with Compoglass rate A was recorded in 50%, rate B in 37.5% and rate D in 12.5%. Compomer restorations with Hytac were evaluated as rate A in 48%, rate B in 36% and rate D in 16%. Changes in marginal discoloration for amalgam restorations were evaluated as rate A in 79.2%, rate B in 16.7% and rate C in 4.2%. Compomer restorations with Compoglass were evaluated as rate A in 70.8%, rate B in 12.5% and rate C in 16.7%, while the results for compomer restorations with Hytac were rate A in 60%, rate B in 24% and rate C in 16% of cases. Statistical analysis was performed by means of nonparametric Kruskal-Wallis and Mann-Whitney tests, which did not show statistically significant difference for the materials, according to the criteria used. Both evaluated compomer materials can be used as alternatives to amalgam restorations in clinical work. However, longer clinical testing is needed in order to obtain relevant results.

5. Knežević A, Tarle Z, Ristić M, Alajbeg I [Iva]. Influence of Polymerization Light Intensity on the Degree of Conversion of Composite Materials (Part I). Acta Stomatol Croat. 2005;39(4):427-39.
    [details]
    [close]
   Full Text

   Title in English:	Influence of Polymerization Light Intensity on the Degree of Conversion of Composite Materials (Part I)
   Title in Croatian:	Utjecaj intenziteta svjetla za polimerizaciju na stupanj konverzije kompozitnih materijala (I dio)
   Type of Article:	original scientific paper
   MeSH:	COMPOSITE RESINS DENTISTRY, OPERATIVE
   Abstract:	Degree of conversion of composite materials is an important factor that influences both quality and longevity of the composite restoration during polymerization. Besides the components of the composite material, degree of conversion is greatly influenced by properties of the light source and polymerization time. The purpose of this study was to compare the effect of three polymerization modes of various intensities (medium, exponential and standard) of Elipar Trilight halogen curing (3M/ESPE, Seefeld, Germany) unit on samples of Tetric Ceram (Vivadent, Schaan, Liechtenstein) and Filtek Z 250 (3M/ESPE, Seefeld, Germany) on the surface and at 2 mm depth. For determining the degree of conversion, Fourier transform infrared spectroscopy (FTIR) was used. Results of the degree of conversion measurement showed the highest degree of conversion when using light source of highest intensity as well as a higher degree of conversion on the surface than at 2 mm depth regardless of the type of composite material and light intensity used for polymerization.

6. Knežević A, Tarle Z, Negovetić Mandić V, Pichler G. Influence of Light Intensity on Temperature Rise During Polymerization of a Composite Resin Sample (Part II). Acta Stomatol Croat. 2005;39(4):441-52.
    [details]
    [close]
   Full Text

   Title in English:	Influence of Light Intensity on Temperature Rise During Polymerization of a Composite Resin Sample (Part II)
   Title in Croatian:	Utjecaj intenziteta svjetla za polimerizaciju na porast temperature u uzorku kompozitnog materijala (II dio)
   Type of Article:	original scientific paper
   MeSH:	COMPOSITE RESINS DENTISTRY, OPERATIVE TEMPERATURE
   Abstract:	One of the most important side effects of composite material setting using halogen devices besides polymerization shrinkage is temperature rise. The temperature rise is in direct relation with the strength of polymerization light intensity and as intensity grows so does the temperature. Since many polymerization devices exist on the market today capable of producing several different polymerization modes with different distribution of light intensity within the polymerization interval as well as different strength, the purpose of this study was to examine the influence of different polymerization programs (modes) on temperature rise in a sample of composite material. In the experiment Tetric Ceram (Vivadent, Schaan, Liechtenstein) and Filtek Z 250 (3M/ESPE Dental Products, St. Paul, MN) composite materials were used. Composite material samples were polymerized by Elipar Trilight halogen device (3M/ESPE, Seefeld, Germany) with three polymerization modes of various intensities (middle (ET ), exponential (ETE) and standard (ETS)). Highest temperature rise was noted after 40 seconds at highest intensity mode (standard mode), while lowest temperature rise was noted at exponential mode after 10 seconds and at medium intensity mode after 40 seconds.

7. Knežević A, Demoli N, Tarle Z, Negovetić Mandić V. Influence of Polymerization Light Intensity on the Polymerization Shrinkage of Composite Materials (Part III). Acta Stomatol Croat. 2005;39(4):453-64.
    [details]
    [close]
   Full Text

   Title in English:	Influence of Polymerization Light Intensity on the Polymerization Shrinkage of Composite Materials (Part III)
   Title in Croatian:	Utjecaj intenziteta svjetla za polimerizaciju na skupljanje kompozitnih materijala (III dio)
   Type of Article:	original scientific paper
   MeSH:	COMPOSITE RESINS DENTISTRY, OPERATIVE
   Abstract:	Composite materials shrink during the polymerization process which lessens their clinical value. Modifications of composition of the composite material and application technique proved inadequate for compensation of polymerization shrinkage, and therefore modification of polymerization modes was attempted. The polymerization modes of lower intensities will enable prolongation of the pre-gelation phase and consequently greatly decrease the total amount of shrinkage. The purpose of the study was to determine the polymerization shrinkage of Tetric Ceram (Vivadent, Schaan, Liechtenstein) and Filtek Z 250 (3M/ESPE Dental Products, St Paul, MN) composite materials by digital holographic interpherometry. Samples of the composite material were polymerized by three modes of various intensities (medium, exponential and standard) Elipar Trilight halogen curing unit (3M/ESPE, Seefeld, Germany). Highest values of the polymerization shrinkage were recorded for the polymerization mode with highest light intensity.

8. Varga S, Šlaj M. New/Modern Adhesive Systems in Orthodontics. Acta Stomatol Croat. 2005;39(4):465-75.
    [details]
    [close]
   Full Text

   Title in English:	New/Modern Adhesive Systems in Orthodontics
   Title in Croatian:	Suvremeni adhezivni sustavi u ortodonciji
   Type of Article:	review
   MeSH:	ORTHODONTICS ADHESIVES
   Abstract:	In this paper the bond strength of the bracket and tooth surface is defined with regard to suitability for clinical practice and different factors described which could have an effect on it. As moisture is the most frequent cause of debonding of the bracket, its effect is discussed on new adhesive systems: conventional, hydrophilic and self-etching. The bond strength of certain systems is compared in dry conditions and under the influence of water and saliva applied to the surface of the enamel during different phases of bracket bonding in in vitro conditions. Their efficacy is then compared in clinical conditions. The specificity of contamination by saliva and blood and the effect of blood on bond strength when using different systems are pointed out.

9. Mehulić K. Glass-Ceramics. Acta Stomatol Croat. 2005;39(4):477-86.
    [details]
    [close]
   Full Text

   Title in English:	Glass-Ceramics
   Title in Croatian:	Staklokeramika
   Type of Article:	case report
   MeSH:	DENTAL MATERIALS CERAMICS GLASS IONOMER CEMENTS
   Abstract:	Glass ceramics is a polycrystal material which is obtained by controlled crystallisation of glass. During the controlled crystallisation of glass a two-phase material emerges: crystals and an amorphous glass matrix. The development of crystals, several micrometers in size, takes place during the procedure of heating the total volume of glass, formation of germs and growth of crystals. The germs are either latently present in the glass or are added as an insoluble material in the finely dispersed distribution of the mixture (glass amorphous mass). Glass ceramic systems exist for laboratory fabrication and machine milling of finished ceramic blocks. By the method of casting and heat pressing glass ceramics materials are obtained with excellent mechanical and aesthetic properties for fabrication single crowns, inlays and onlays and also of three-unit bridges.