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PubMed1993

Tensile bond strength of orthodontic brackets bonded with a fluoride-releasing light-curing adhesive. An in vitro comparative study.

A light-curing, fluoride-releasing adhesive (VP 862, Vivadent, Liechtenstein) for bonding of brackets has been produced for inhibition of white spot lesions during orthodontic treatment. The tensile bond strength after 24 hours and 6 months was investigated and compared with two other light-curing adhesives (Transbond, 3M Corp., Monrovia, Calif., and Heliosit-Orthodontic, Vivadent, Liechtenstein) and two chemical-curing adhesives (Concise, 3M, Monrovia Calif., and Saga Bond, Saga Orthodontics, Kongsvinger, Norway). All adhesives produced adequate strength to be recommended for clinical use. The light-curing adhesives produced slightly lower bond strengths after 24 hours and 6 months, except Transbond, which showed an increase in bond strength in this period approaching the two chemical adhesives.

Adhesives↗
PubMed2002

TBE foci in Switzerland.

To give information about the situation in Switzerland and especially in the canton Thurgau. Tick-borne encephalitis (TBE) in Switzerland has to be reported to official bodies, such as the Cantonal Office of Health and the Swiss Federal Office of Public Health. The registered cases are published weekly in the Bulletin of the Swiss Federal Office of Public Health. A map with geographical sites of infection has been published by the Swiss Federal Office of Public Health from time to time. In addition we collect epidemiological data in our diagnostic setting servicing part of eastern Switzerland. The situation of every patient diagnosed in our laboratory is followed up by a questionnaire. Some data derive from an epidemiological study conducted by Baumberger et al. (1996) and from another study conducted in the principality of Liechtenstein (Krech et al., 1992). The data of a more recent publication are also included (Schwanda et al., 2000). More historical data are taken from Krech (1980). Recently, the global positioning system (GPS) connected to a laptop computer containing a geographical map on CD-ROM was used for better determination of possible TBE microfoci. TBE is endemic in areas of northern Switzerland and the principality of Liechtenstein. The number of reported new infections in Switzerland per year ranges between 60 and 120 cases, most of them with neurological manifestations. This represents an incidence of 0.5-1.5 per 100,000 inhabitants per year. In the last 10 years a prominent increase of the number of reported cases occurred in Switzerland, namely from 30-70 cases per year to 60-120 cases per year. This increase was mainly caused by the emergence of TBE in the cantons of Thurgau, Aargau and St. Gallen, all localised in the north-eastern part of Switzerland. The canton Thurgau became the most dangerous region in Switzerland for TBE during the last ten years. Besides the known endemic areas of the regions of Schaffhausen, Thun and Biel-Ins, a number of additional foci have been detected during the last 20 years. These are situated, for instance, around the lake of Zurich or in the region of Chur. In the canton Thurgau, new cases could be located east of the formerly known foci. Besides the larger epidemic areas known there are several TBE virus microfoci in Switzerland and more microfoci are still recognized. Despite active vaccination of persons at risk the incidence of reported TBE cases has increased during the last 20 years, now being between 60 and 120 cases per year, some of them with a severe and prolonged course. No TBE foci have been recognized in western und southern Switzerland so far. From our observations we have got the impression that real new TBE foci are emerging in some regions of eastern Switzerland.

Animals↗
PubMed2003

Time-dependent strength and fatigue resistance of dental direct restorative materials.

Elastic modulus (EM), initial fracture strength (FS) and flexural fatigue limit (FFL) of dental restorative materials were measured in a simulated oral environment to correlate mechanical response under the influence of water with the chemical nature of the test materials under investigation. One resin composite (RC; Tetric Ceram, Ivoclar-Vivadent Corp., Liechtenstein), an ion-leaching resin composite (ILRC; Ariston pHc, Ivoclar-Vivadent Corp., Liechtenstein) a compomer (CO; Dyract AP, Dentsply Corp., USA) and a glass-ionomer cement (GIC; Ketac Molar, 3MEspe Corp., Germany) were tested. Static EM, FS and dynamic FFL experiments were performed. The FFL was determined under cyclic loading for 10(5) cycles in terms of a staircase approach. The materials were stored for 1, 8, 30, 90 and 180 days in 37 degrees C distilled water, respectively. The RC degraded over time due to water adsorption followed by failure within the resin matrix. The ILRC suffered from a pronounced decrease in FS as well as in FFL due to a constant ion-leaching and macroscopic crack growth. CO failed over time due to resin-filler interface cracking. The GIC exhibited improved mechanical performance over time due to a post-hardening mechanism. The results reveal the necessity for substantial preclinical evaluation of direct restorative materials. The material parameters under investigation are capable of predicting clinical performance over time.

Journal Article↗
PubMed1999

The effect of bonding agents on the microleakage and bond strength of sealant in primary teeth.

This in vitro study investigated the effect of use of three dentine bonding agents: Scotchbond Multi-Purpose Plus (3M Dental Products, St. Paul, Minnesota, U.S.A.), Syntac (Vivadent, Schaan, Liechtenstein), Optibond Dual Cure (Kerr, Romulus, MI, U.S.A.) on microleakage and shear bond strength of a fissure sealant (Helioseal F, Vivadent, Schaan, Liechtenstein) bonded to either dry or wet (saliva contaminated) enamels of primary teeth. Newly extracted 112 non-carious primary teeth were sectioned and embedded in resin blocks. Eight groups were formed for each test. Each group consisted of 14 specimens. Group 1 and 2: fissure sealant was applied directly to etched enamel in dry and wet condition, respectively; Group 3 and 4: fissure sealant was applied onto etched and Scotch-bond Multi-Purpose Plus treated enamel in dry and wet condition, respectively; Group 5 and 6: fissure sealant was applied onto etched and Syntac treated enamel in dry and wet condition, respectively; Group 7 and 8: fissure sealant was applied onto etched and Optibond Dual Cure treated enamel in dry and wet condition, respectively. The results revealed that the use of an enamel-dentine bonding agent under fissure sealant increased the bond strength and decreased the microleakage. The use of enamel-dentine bonding agents under sealant in moisture contaminated conditions gave better results than applying sealant alone onto non-contaminated teeth. Finally, Scotchbond Multi-Purpose Plus yielded the best results for both tests.

Bisphenol A-Glycidyl Methacrylate↗
PubMed2003

Spectrophotometric analysis of all-ceramic materials and their interaction with luting agents and different backgrounds.

In this study, two All-Ceramic (AC) materials--Empress 2 (EMP) (Ivoclar Vivadent AG, Schaan, Liechtenstein) and In-Ceram ALUMINA (ICA) (Vita Zahnfabrik, Bad Säckingen, Germany)--were analyzed, along with the effects of 3 luting agents-viz. Zinc Phosphate cement (ZNPO, PhospaCEM PL, Ivoclar Vivadent AG, Schaan, Liechtenstein), Glass Ionomer Cement (GIC, Ketac-Cem Radiopaque, ESPE Dental AG, Seefeld, Germany), and Compolute (COMP, ESPE Dental AG, Seefeld, Germany)--on the final color, using the CIELab system. Color differences (DeltaL, Deltaa, Deltab, and DeltaE) were calculated for samples with luting agents and for samples without luting agents with standard white and black backgrounds, with the use of a spectrophotometer, Luci 100 (Dr. Lange, Berlin, Germany). One-way ANOVA for DeltaL, Deltaa, Deltab, and DeltaE within both the AC systems, with and without luting agents, showed significant contributions of the background (p < 0.05). EMP was seen to be more translucent than ICA. Darker ceramics showed less color variation. Luting agents altered the final color of the restoration. ZNPO was least translucent, followed by GIC and COMP. Marginal increases in thicknesses of ICA samples (0.4 mm) do not show a statistically significant color difference. No method exists to predict the outcome of an AC restoration based on consideration of the luting agent and the background color.

Analysis of Variance↗
PubMed2001

The suitability of packable resin-based composites for posterior restorations.

BACKGROUND: Packable composites, promoted for the restoration of stress-bearing posterior teeth, have captured clinicians' interest. METHODS: The authors tested three packable composites (Alert, Jeneric/Pentron; Solitaire, Heraeus Kulzer, Wehrheim, Germany; SureFil, Dentsply De Trey, Konstanz, Germany); a new packable organically modified ceramic, or ormocer (Definite, Degussa AG, Hanau, Germany); a hybrid composite (Tetric Ceram, Ivoclar Vivadent, Schaan, Liechtenstein) and an ion-releasing composite (Ariston pHc, Ivoclar Vivadent, Schaan, Liechtenstein). They determined modulus of elasticity according to EN 24049:1993 of the European Committee for Standardization. They measured Vickers hardness using a 200-gram load for 40 seconds. To determine the materials' depth of cure, they used both a scraping method (International Standards Organization standard CD 4049:1997) and a hardness profiling method. RESULTS: The authors calculated means and standard deviations from 10 replications of each test and used one-way analysis of variance and post hoc Tukey tests (alpha = .05). The materials had significant differences (P < .001) in all characteristics. Solitaire had the significantly lowest elastic modulus and microhardness; Alert had the highest values for these characteristics. Ariston pHc exhibited the significantly lowest depth of cure. There was a significant correlation between the two methods of measuring depth of cure (r2 = 0.9945; P = .021). CONCLUSIONS: The material group of packable composites is rather inhomogeneous in terms of mechanical and physical data. Our data suggest that bulk curing of packable composites in deep cavities still is not recommendable. CLINICAL IMPLICATIONS: The clinician needs to select packable composites carefully, as it seems that not all of these materials quality for stress-loaded posterior restorations.

Analysis of Variance↗
PubMed2001

Color stability of different denture teeth materials: an in vitro study.

The aim of this in vitro study was to compare the color stability of commercially available porcelain, reinforced acrylic, and conventional acrylic denture teeth materials used in removable prostheses. Two brands of porcelain (Unilux-Enta Lactona-Holland and Vivoperl-Ivoclar-Liechtenstein), 2 brands of reinforced acrylic (Optodent-Bayer-Germany and Ivolek-Ivoclar-Liechtenstein), and 2 brands of conventional acrylic (Isodent-Güney Diş Deposu-Turkey and Samed-Turkey), were made, for a total of 6 different denture teeth groups. Denture teeth were subjected to 3 staining solutions (filtered coffee, tea, and cola) and distilled water. From each group of denture teeth, 4 sets of maxillary anterior denture teeth were immersed in each of the 4 solutions. The color values of denture teeth were measured colorimetrically with the Gardner XL 20 Tristimulus Colorimeter (Gardner Lab. Inc., Bethesda, Maryland, USA). Color changes were characterized in the CIEL*a*b* color space. Color change values were determined after 1 day, 1 week, 2 weeks, and 4 weeks. The color difference values were calculated and then evaluated by two-way ANOVA statistically. The filtered coffee solution was found to be more chromogenic than the other 2 staining solutions, while porcelain denture teeth materials were more color stable. Assuming the color change of deltaE* < 1.0 as a discernible limit and deltaE* = 3.3 as an acceptable value, the filtered coffee, tea, and cola had slight staining effects on all 6 groups of denture teeth.

Acrylic Resins↗
PubMed1988

Law on the amendment of the Law concerning the payment of the maternity allowance, 11 November 1987.

This Law sets new maternity allowances in Liechtenstein on the basis of the taxable income of both spouses as follows: 1) Fr. 3200 for incomes up to Fr. 40,000; 2) Fr. 2500 for incomes between Fr. 40,001 and 50,000; 3) Fr. 1800 for incomes between Fr. 50,001 and 60,000; 4) Fr. 1100 for incomes between Fr. 60,001 and 70,000; and 5) Fr. 400 for incomes between Fr. 70,001 and 80,000.

Developed Countries↗
PubMed1988

Law concerning the amendment of the Law on family allowances, 20 December 1988.

This Law amends the Liechtenstein Law on family allowances (see Annual Review of Population Law, Vol. 2, 1985, Section 420) by increasing family allowances to Fr. 140 a month for each child (including orphans) and to Fr. 170 when the child reaches the age of 10. If the person entitled to receive the family allowance has more than two children, the allowance is Fr. 170 per child. The birth allowance for children born alive or dead or who are adopted is set at Fr. 1,200 for each child and at Fr. 1,500 when there are multiple births.

Adoption↗
PubMed1998

[Evaluation of a community-oriented health promotion project "Mauren Aktiv"].

In the year 1996, "Mauren Aktiv"--a community health promotion project in Liechtenstein--was evaluated. The methods used were as follows: Interviews with key-persons of the community, group-discussions, written questionnaire, telephone-interviews and analysis of documents. The evaluation showed the following results: "Mauren Aktiv" works. It has increased the offer of health promotion activities by more than 100 percent. The offer is well received by the population. The flexible organisational structure proved to be functional. But "Mauren Aktiv" only partly achieves its claim to be a co-ordinating agent for all health promotion activity within the community. Favourable factors for the project are the co-operation of numerous volunteers and the conditions offered by the municipality. On the contrary the co-operation of the volunteers and the lack of professional support cause problems, for example regarding the documentation of the activities of "Mauren Aktiv".

Community Participation↗
PubMed2005

Genetic clustering of Borna disease virus natural animal isolates, laboratory and vaccine strains strongly reflects their regional geographical origin.

The aim of this study was to gain more detailed insights into the genetic evolution and variability of Borna disease virus (BDV). Phylogenetic analyses were performed on field viruses originating from naturally infected animals, the BDV vaccine strain 'Dessau', four widely used laboratory strains and the novel BDV subtype No/98. Four regions of the BDV genome were analysed: the complete p40, p10 and p24 genes and the 5'-untranslated region of the X/P transcript. BDV isolates from the same geographical area exhibited a clearly higher degree of identity to each other than to BDV isolates from other regions, independent of host species and year of isolation. Five different clusters could be established within endemic areas, corresponding to the geographical regions from which the viruses originated: (i) a Swiss, Austrian and Liechtenstein Rhine valley group, related closely to the geographically bordering Baden-Wurttemberg and Bavaria II group (ii) in the western part of Germany; (iii) a third group, called Bavaria I group, limited in occurrence to Bavaria; (iv) a southern Saxony-Anhalt and bordering northern Saxony group, bound to the territories of these federal states in the eastern part of Germany; and (v) a mixed group, consisting of samples from different areas of Germany; however, these were mainly from the federal states of Thuringia and Lower Saxony. The laboratory strains and the vaccine strain clustered within these groups according to their geographical origins. All field and laboratory strains, as well as the vaccine strain, clearly segregated from the recently described and highly divergent BDV strain No/98, which originated from an area in Austria where Borna disease is not endemic.

5' Untranslated Regions↗
PubMed2003

Risk factors for antibiotic resistance in Campylobacter spp. isolated from raw poultry meat in Switzerland.

BACKGROUND: The world-wide increase of foodborne infections with antibiotic resistant pathogens is of growing concern and is designated by the World Health Organization as an emerging public health problem. Thermophilic Campylobacter have been recognised as a major cause of foodborne bacterial gastrointestinal human infections in Switzerland and in many other countries throughout the world. Poultry meat is the most common source for foodborne cases caused by Campylobacter. Because all classes of antibiotics recommended for treatment of human campylobacteriosis are also used in veterinary medicine, in view of food safety, the resistance status of Campylobacter isolated from poultry meat is of special interest. METHODS: Raw poultry meat samples were collected throughout Switzerland and Liechtenstein at retail level and examined for Campylobacter spp. One strain from each Campylobacter-positive sample was selected for susceptibility testing with the disc diffusion and the E-test method. Risk factors associated with resistance to the tested antibiotics were analysed by multiple logistic regression. RESULTS: In total, 91 Campylobacter spp. strains were isolated from 415 raw poultry meat samples. Fifty-one strains (59%) were sensitive to all tested antibiotics. Nineteen strains (22%) were resistant to a single, nine strains to two antibiotics, and eight strains showed at least three antibiotic resistances. Resistance was observed most frequently to ciprofloxacin (28.7%), tetracycline (12.6%), sulphonamide (11.8%), and ampicillin (10.3%). One multiple resistant strain exhibited resistance to five antibiotics including ciprofloxacin, tetracycline, and erythromycin. These are the most important antibiotics for treatment of human campylobacteriosis. A significant risk factor associated with multiple resistance in Campylobacter was foreign meat production compared to Swiss meat production (odds ratio = 5.7). CONCLUSION: Compared to the situation in other countries, the data of this study show a favourable resistance situation for Campylobacter strains isolated from raw poultry meat produced in Switzerland. Nevertheless, the prevalence of 19% ciprofloxacin resistant strains is of concern and has to be monitored. "Foreign production vs. Swiss production" was a significant risk factor for multiple resistance in the logistic regression model. Therefore, an adequate resistance-monitoring programme should include meat produced in Switzerland as well as imported meat samples.

Animals↗
PubMed2002

Bilateral open bite in dicygotic twins. A combined orthodontic-prosthetic approach.

CASE REPORT: Dizygotic twins, male, 25 years of age, required treatment for an identical orthodontic diagnosis. DIAGNOSIS: Class III malocclusion with mesial molar relation and frontal edge-to-edge bite, lyrate upper dental arch, grouped cross-bite and bilateral open bite in the molar and bicuspid region, retention and lingual inclination respectively of the lower left second bicuspid, mesial inclination of both lower first molars. The severity of the malocclusion differed in the two brothers. THERAPY: Orthodontic treatment was successful concerning the transversal expansion and alignment of the maxillary dental arch, the functional relation of the anterior teeth, the transversally correct relation of the upper and lower dental arches and, following surgical removal of the lower second bicuspids, the reduction of crowding in the lower arch. An attempt was made to upright the molars in the mandibular arch and to close the lateral open bite by means of vertical elastics. However, the 10-month period of resistance to the therapy suggested, after a tongue protrusion habit had been ruled out, a diagnosis of ankylosis. Further orthodontic treatment was renounced and a prosthetic solution was pursued instead: the teeth in infraocclusion were treated with full ceramic overlays and, in the regions with residual gaps, with pontics (Empress II, Ivoclar, Schaan, Liechtenstein), after minimally invasive preparation (confined to removal of existing fillings). CONCLUSION: This case is particularly interesting because the infrapositioned molars in both brothers were very likely due to ankylosis, suggesting a genetic cause.

Adult↗
PubMed2002

Microleakage in class II composite resin restorations: application of a clearing protocol.

Microleakage at the cervical tooth/restoration interface of class II restorations was evaluated, either on multiple sections or on teeth rendered transparent, in order to determine whether a modified clearing protocol could be established as a routine method for microleakage evaluation in class II restorations. Forty-eight class II cavities were restored with a composite/bonding agent (Tetric Universal/Heliobond, Vivadent, Schaan, Liechtenstein) in bulk technique (BT) (n=24) and with a composite/dentin adhesive system (Tetric Universal/Heliobond/Syntac Classic) in increments (IT) (n=24). The 24 specimens were assigned to two groups. Group I: dye penetration (India ink), multiple sectioning (conventional method). Group II: dye penetration (India ink) and modified clearing protocol. Linear microleakage (% dye/section) along the cervical tooth/restoration interface on multiple sections, and microleakage patterns (% dye/surface) at the cervical surface on transparent teeth were evaluated with an image analyzing system. The data were statistically analyzed with the Mann Whitney U-test, Wilcoxon's rank sum test, and the error rates method. The application of the modified clearing protocol allowed for distinct evaluation of microleakage patterns. Either protocol revealed lower penetration values for IT than for BT. With the conventional protocol, the median (25-75% percentiles) percentage of dye penetration was 2% (1-46%) for IT and 40% (23-85%) for BT. The clearing protocol revealed dye penetration of 5% (1-22%) for IT and 16% (4-24%) for BT. The clearing protocol together with the use of India ink as tracer allows for evaluation and visualization of the continuous distribution of microleakage at the cervical tooth/restoration interface without loss of information due to sectioning, although this method seems to be less discriminative than the conventional sectioning technique.

Acrylates↗
PubMed1998

Clinical evaluation of a hybrid composite and a polyacid-modified composite resin in Class-II restorations in deciduous molars.

The aim of this prospective study, conducted in a dental practice was to evaluate the success rate of a hybrid composite material (TPH-Spectrum; Dentsply DeTrey, Konstanz, Germany) and a polyacid-modified composite resin (Compoglass; Vivadent, Schaan, Liechtenstein) in Class II restorations in primary molars after 1 year. A total of 190 restorations (96 with TPH-Spectrum and 94 with Compoglass) were inserted in 52 children. TPH-Spectrum was applied using the total etching technique, whereas Compoglass was inserted without acid etching prior to application of the bonding adhesive. The restorations were assessed according to the Ryge criteria, directly after placement and after 1 year. After 12 months, 6.4% of the Compoglass and 3.1% of the TPH-Spectrum restorations were clinically unacceptable and had to be renewed. The fillings with Compoglass revealed a tendency to lower evaluation scores with respect to color matching, cavosurface discoloration, anatomic form, margin integrity and caries assessment than the restorations with TPH-Spectrum. However, these differences were statistically not significant. The results of the present investigation show that, at least for a period of 1 year, both the hybrid composite TPH-Spectrum and the polyacid-modified composite resin Compoglass are suitable materials for restoration of deciduous molars. However, owing to the fewer treatment steps required for application of a polyacid-modified composite resin, this type of material may be more favorable for restoring primary molars.

Chi-Square Distribution↗
PubMed2003

Barbecued chicken causing a multi-state outbreak of Campylobacter jejuni enteritis.

BACKGROUND: Although the microbiological safety of food has improved, food-borne disease remains a significant cause of morbidity and mortality in Europe. PATIENTS AND METHODS: We investigated an outbreak of Campylobacter jejuni enteritis attributed to chicken meat, affecting five out of six people attending a private barbecue party in Germany. Patients fell ill in Germany, in Liechtenstein and in Austria. 80% of the cases had been exposed to barbecued chicken; the case that denied having eaten chicken was the party host, who also handled all the food. Three of four patients submitting stool specimens had culture-confirmed C. jejuni infection. RESULTS: The chicken meat was purchased in the Tyrol (Austria) and originated from a flock of 55600 chickens raised in Carinthia (Austria). Caecal swabs were obtained in 7 weeks later from 22 chicken at the incriminated farm: 18 of the 22 samples yielded C. jejuni. The same day, six carcasses out of 22000 slaughtered animals from the incriminated farm were tested and all six food samples yielded C. jejuni. Outbreak-associated human isolates yielded pulsed-field gel electrophoresis patterns indistinguishable from each other and from the meat isolates, but different from four human control strains and from 13 of 16 isolates from caecal swabs. CONCLUSION: Our data show that the outbreak clone had been colonizing the slaughterhouse and was cross-contaminating chickens there. The geographic mobility of people and food necessitates proper epidemiologic investigations to avoid overestimation of the proportion of sporadic occurrence of campylobacteriosis.

Adult↗
PubMed1985

Protrusive positioners.

Techniques were described for fabricating maxillary and mandibular protrusive positioners for treatment of disk-condyle derangements. Treatment time with the splints varies from 4 to 12 months depending on the age of the patient, the degree of existing symptoms, and patient motivation. At the end of the treatment period and after removal of the splints, the patient may have (1) no pain or internal derangement, (2) no pain but internal derangement with or without reduction, or (3) pain and internal derangement with or without reduction. If dental treatment is required, patients in the first two categories can be treated at a physiologically acceptable treatment position with existing treatment modalities. For patients in the third category, definitive, irreversible stabilization should be reevaluated. For these patients a mandibular cast splint can be changed to an interim splint by replacing the self-polymerizing resin with Isosit (Ivoclar-Vivadent, Schaan, Liechtenstein) or heat-processed acrylic resin.

Age Factors↗
PubMed2006

Effect of various adhesive systems on the shear bond strength of fiber-reinforced composite.

INTRODUCTION: The purpose of this study was to evaluate the effect of 3 adhesive systems on the shear bond strength of a fiber-reinforced composite (FRC). METHODS: Sixty bovine permanent mandibular incisors were randomly divided into 3 groups of 20. The FRCs (Ortho, Stick Teck Ltd, Turku, Finland) were bonded to the teeth with 3 adhesive systems (Tetric Flow [Ivoclar-Vivadent, Schaan, Liechtenstein], Transbond XT [Unitek/3M, Monrovia, Calif], and Fuji Ortho LC [GC Europe, Leuven, Belgium]). After bonding, all samples were stored in distilled water at room temperature for 24 hours and subsequently tested for shear bond strength. Analysis of variance and the Sheffé post-hoc tests were used at a significance level of P < .05. RESULTS: ANOVA indicated significant differences among the various groups. Fibers bonded with Transbond XT showed significantly higher shear bond strengths than the other 2 groups. No significant differences in shear bond strength values were reported between Tetric Flow and Fuji Ortho LC. No significant differences in debond locations (ARI scores) were found among the various groups. CONCLUSIONS: For maximum bond strength, use Transbond XT for direct bonding of FRC.

Acrylic Resins↗