290 research outputs found
Oral Status, Aesthetic Materials and Frequency of Crowns and Bridges in Patients with Fixed Prosthetic Appliances Living in the Metkovi} Region
The aim of the study was to examine oral status in patients of the Metkovi} region
with fixed prosthodontic appliances. The aim was also to evaluate aesthetic materials
used, and difference between the frequency of crowns and bridges dependent on patient’s
age and frequency of visits to dentist. The examination was performed on 212 dental patients
with fixed prosthetic appliances, from the Public Health Center »Metkovi}«. A
questionnaire was created for the purpose of this study and was filled in by the patients.
The dentist registered oral status. Descriptive statistics and
2 tests were used for the
data analysis. Following conclusions were made: 1. The examined patients had relatively
high caries (tooth decay), gangrene and residual roots prevalence, the oral hygiene
was not appropriate, calculus and gingivitis were diagnosed in all patients (100%) and
these facts point out to the insufficient preventive oral health care in the Metkovi} region,
as well as to the insufficient self-perception on the proper oral hygiene maintenance.
2. Patients who visit their dentist regularly (once a year or more) have significantly
more crowns than bridges than the patients who visit their dentist irregularly or
when in pain (p < 0.01). 3. Almost all fixed prosthetic appliances not older than 10 years
were made of porcelain (98%), while acrylic veneer crowns (or chromasite) were more
frequent in appliances older than 10 or 15 years (p < 0.01). There was no gender difference
dependent on the material used (p > 0.05). High frequency of porcelain was attributed
to the high economic status of this region, as well as to a dentist’s preference
Termofizička svojstva serpentinita
In this article serpentinite from Banovina, Croatia, was studied. The antigorite is main mineral constituent of that rock. The dilatation curve shows that the first contraction of sample is coursed by dehydratation of antigorite at nearly 660°C. In spite of this, the second contraction of sample, which begines at nearly 860°C, is incident with olivine phase formation. The morphology of the serpentinite before and after thermal treatment was observed with the optical microscope. Image of serpentinite before thermal treatment is characterized by inclusions of olivine as primary mineral left as residue in process of serpentinization. Image of serpentinite after thermal treatment was changed by water disappear. The first thermal treated and than milled serpentinite has better properties than the first milled and than thermally treated serpentinite.U ovom radu istraživan je serpentinit s nalazišta na Banovini u Hrvatskoj. U toj mineralnoj sirovini prevladavajući mineral je antigorit. Dilatacijska krivulja ukazuje da je prva kontrakcija uzorka uzrokovana dehidratacijom antigorita na približno 660°C. Nasuprot tome, na drugu kontrakciju uzorka koja počinje pri približno 860°C utječe stvaranje olivina. Morfologija serpentinita prije i poslije termičke obradbe promatrana je optičkim mikroskopom. Izgled serpentinita prije termičke obradbe karakteriziran je uključcima olivina kao primarnog minerala zaostalog u procesu serpentinizacije. Izgled serpentinita poslije termičke obradbe promijenio se uslijed eliminacije vode. Prvo termički obrađen te potom mljeven serpentinit ima bolje karakteristike od prvo mljevenog, a potom termički obrađenog serpentinita
Hysteresis in an Ising model with mobile bonds
Hysteresis is studied in a disordered Ising model in which diffusion of
antiferromagnetic bonds is allowed in addition to spin flips. Saturation
behavior changes to a figure-eight loop when diffusion is introduced. The upper
and lower fields delimiting the figure-eight are determined by the Hamiltonian,
while its surface and the crossing point depend on the temperature and details
of the dynamics. The main avalanche is associated with the disappearance of
hidden order. Some experimental observations of figure-eight anomalies are
discussed. It is argued they are a signal of a transient rearrangement of
domain couplings, characteristic of amorphous and/or magnetically soft samples,
and similar to evolution of kinetic glasses.Comment: 7 pages, 7 figure
The new approach of the production technique of discontinuous Cu-C composite
The samples of the Cu-C composite were produced by two different techniques (i) the sintering of powders, and (ii) the internal carbonization of rapidly solidified pure copper. The aim of the present research was to produce a discontinuous Cu-C composite with the submicron dispersion of graphite particles. The results of our microstructural investigation show that the use of the mechanical alloying and sintering of consolidated powders is an inappropriate way to achieve a submicron dispersion of the graphite particles. On the other hand, the combination of rapid solidification and internal carbonization was found to be an efficient technique to obtain the requested microstructure
The Scale of Positive and Negative Experience (SPANE):Evaluation of Measurement Invariance and Convergent and Discriminant Validity
Influence of different physico-chemical modification treatments on structure and properties of flax fibers
U teorijskom dijelu doktorske disertacije su sistematizovani najznačajniji literaturni podaci o hemijskom sastavu, strukturi i svojstvima vlakana lana i reaktivnosti celuloze i celuloznih vlakana. Značajan dio teorijskih razmatranja posvećen je modifikovanju i funkcionalizaciji celuloznih materijala, uključujući postupke fizičkog i hemijskog modifikovanja vlakana lana i mogućnosti primjene nemodifikovanih i modifikovanih vlakana lana za sorpciju jona teških metala i dobijanje bioaktivnih (antimikrobnih) vlakana...In the theoretical part of doctoral dissertation, the most significant literature data concerning chemical composition, structure and properties of flax fibers, as well as reactivity of cellulose and cellulose fibers are systematically reviewed. Modification and functionalization of cellulosic materials, including treatments of physical and chemical modification of flax fibers and the possibility of application unmodified and modified flax fibers for sorption of heavy metals ions and obtaining bioactive (antimicrobial) fibers represent a significant part of the theoretical considerations..
Positive Expectancies and Subjective Well‑Being: A Prospective Study Among Undergraduates in Serbia
wild birds in Serbia during 2012: first isolation and characterisation of WNV strains from Serbia
Monitoring West Nile virus (WNV) infection i
Distribution of Craniofacial Variables in South Dalmatian and Middle Croatian Populations
The objective of the present work was to determine some relevant craniofacial parameters,
particularly in relation to sex, for the study of the distribution of basic head
and face types, and to investigate craniofacial and morphological differences between
two population samples. The study sample comprised 100 subjects of both sex aged 18 to
30 from South Dalmatia and 200 subjects from Middle Croatia. Eight basic craniofacial
variables were measured to obtain head, forehead and face indexes. The data indicate
that average values of all variables can be used as standard craniofacial parameters
for the examined population groups. All the craniofacial variables are considerably
higher in men than in women (p < 0.05). In the South Dalmatian population mesocephalia
(48.0%) and leptoprosopia (82.0%) prevail, while in the Middle Croatian population
the brachycephalia (62.0%), and euriprosopia (73.5%) are present to a greater degree.
The most significant craniofacial and morphological differences between the
examined study samples are head width (Eu–Eu), face width (Zy–Zy), and forehead
height (Tr–N). They were found to be statistically significant in the examined Middle
Croatian population (p < 0.05). The presented measurements are highly relevant to orthodontic
diagnostics and therapy
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