60 research outputs found
Preventive Sealing of Dental Fissures with Heliosil: A Two-year Follow-up
Due to their shape and configuration of dental crown, especially its biting surface
with numerous pits and fissures permanent molars are suitable sites for retaining food
remnants and bacteria. For this reason, preventive efforts and early prophylactic procedures
should prevent the development of caries at these critical sites. Deciduous and
permanent teeth of 300 children aged 6ā7 years with healthy parallel teeth were included
in the study. Fissure sealing was performed on one side, whereas contralateral
teeth served as controls. During a two-year period, control examinations with finding
recordings were performed every six months. During the two-year follow-up period, the
sealed teeth remained free of caries as long as the coating persisted. In deciduous teeth,
the sealant was first observed to be missing at 18 months in 5%, and at 24 months in 8%
of the teeth. None of these teeth was affected by caries, suggesting that a part of the sealant
was retained in the fissures. In permanent teeth, caries developed in 18% of the
sealed teeth at 24 months
Trends in Dental Caries in 12-Year Old Children in Croatia
In this epidemiological study the caries status of 12-year-old children was compared
over time for the years 1968, 1973, 1980, 1985, 1990, 1991 and 1999. The mean number
of decayed, missing and filled teeth (DMFT) decreased from 7.0 in 1968 to 2.6 in 1991.
From 1991 to 1999 and increase of DMFT 2.6 in 1991, to 3.5 in 1999) has been seen
which is result of war in Croatia and reorganisation of health care delivery system.
With the expected continuing decline in the prevalence and severity of oral diseases, one
of the main problems in the future seems to be the transition of the oral health care delivery
system from a disease-oriented system to a health-oriented one
Interferometry in the Assessment of Biomechanical Features of the Masticatory System Hard Segments
Biomechanical studies have found wide application and solved many problems in
dental medicine. An interdisciplinary approach has allowed an ever-faster progress in
the field. The aim of this study was to point out the advantages of holographic interferometry.
With the use of this method, the study object is observed as a whole rather than
as a substrate, thus providing a three-dimensional holographic image visualizing the
load transmission from one jaw to another, tooth pressure against the alveolus, and
strain of Sharpey\u27s fibers, and yielding precise data on deformities, dislocations and
force distribution
Interferometry in the Assessment of Biomechanical Features of the Masticatory System Hard Segments
Biomechanical studies have found wide application and solved many problems in
dental medicine. An interdisciplinary approach has allowed an ever-faster progress in
the field. The aim of this study was to point out the advantages of holographic interferometry.
With the use of this method, the study object is observed as a whole rather than
as a substrate, thus providing a three-dimensional holographic image visualizing the
load transmission from one jaw to another, tooth pressure against the alveolus, and
strain of Sharpey\u27s fibers, and yielding precise data on deformities, dislocations and
force distribution
Mandibular Border Positions in Eugnathic Subjects during the Second Bite Lifting
This research was aimed at performing a clinical functional analysis during the second
bite lifting, in order to define mandibular border positions and possible differences
by sex and/or age. Out of a total of 9680 examined children from the region of Me|imurje,
Croatia, 103 were found to be eugnathic, with dentition in occlusion during the
phase of the second bite lifting. All the eugnathic patients belonged to the class I by Angle,
without any caries, fillings or extracted teeth. They were divided into three predefined
groups for the sake of comparison. The obtained values of mandibular border positions
in eugnathic subjects during the second bite-lifting phase vary with age and with
the number of present permanent teeth in occlusion. Generally, all the values are higher
in girls than in boys, which speaks in favour of the assumption that mandibular border
positions are determined by sex, hormonal activity, growth and intercuspidation. Also,
girls show a higher TMJ flexibility as well as a higher mandibular mobility. The knowledge
of these facts will contribute to a more precise treatment in child prosthetics and
pedodontics
Chronology, Dynamics and Period of Permanent Tooth Eruption in Zagreb Children (Part II)
The aim of the present paper is to determine the beginning, order, median time, termination, dynamics, continuity and intensity of the permanent tooth eruption, as well as its calendar, in a sample of Zagreb children. The study included 2768 children (1398 boys and 1370 girls). All subjects were classified in one-year age groups. The continuity of tooth eruption occurs from 5.1 years to 14.97 years, i.e., for a period of 9.87 years. Each particular tooth has its own dynamics of eruption (V5āV95) which on the average amounts to 4.25 years. The continuity of eruption is 10.1 years in boys and 9.8 years in girls. The dynamics of eruption is 4.15 years in boys and 4.35 years in girls. A certain asymmetry in eruption has been described
Synthesis and Characterization of Amorphous Nickel(II) Aluminosilicate
Amorphous aluminosilicates containing about 12 wto Ā°/0 nickel
have been synthesized bycation exchange. Approximately 40Ā°/0 of the nickel content is present in the form of octahedral [NiH20)6]2+ ions while the bulk of NF+ is coordinated both by I-hO molecules and by oxygen atoms of the aluminosilicate framework. When the materials are heated in air at 350 -c, a change in the nickel coordination environment/geornetry and possibly also a partial oxidation take place
Evaluation of Craniometric Methods for Determination of Vertical Dimension of Occlusion
In clinical practice, fully precise method for exact determination of vertical relation
of occlusion still does not exist. This study examines the relationship between different
craniofacial distances and the distance subnasaleā gnathion (SnāGn), which represents
the lower third of the face in vertical relation determination. The highest coefficient of
correlation was (r = 0.8678, p < 0.05) between the distance eyeāear (EāE = lateral border
of the ocular orbitāmedial opening of the meatus of the external auditory canal) and
SnāGn. The prediction of the distance SnāGn could be determined through the formula:
SnāGn = EāE / 1.08 or through the regression analysis: SnāGn = 1.9197 + 0.6449 x
EāE. None of the calculated coefficients of correlation was 1, but was < 1, so that the prediction
of the distance SnāGn by craniometric distances is not absolutely reliable, although
it is considerably helpful. Our results point at the variations of craniofacial distances
in the Croatian population. Yet, craniometry could still be recommended in
everyday clinical practice for prediction of vertical relation of occlusion, as it is a simple,
economic and non-invasive method, however in combination with some other methods,
which have proved to be helpful
The Patientās and the Therapistās Evaluation of Bridges of Different Materials and Age
The aim of this study was to find out patients\u27 satisfaction with their bridges made of
different materials (metal-ceramics, Au/resin, Ag-Pd/resin). One hundred and sixty
four patients were examined at the Dental School, University of Zagreb, Croatia. They
assessed their bridges ā the overall quality, aesthetics, speech, chewing and the health of
the gingiva by the scale from 1ā5. The same categories were also assessed by a trained
prosthodontist. The majority of the patients was really satisfied and gave the highest
grades (quality, aesthetics, speech, etc.) and therefore the results were skewed and asymmetrical
towards the biggest scores (biggest grades). The best gingival health was evaluated
by the group of patients with ceramic crowns and bridges (p < 0.05) and the worst
by the patients with Ag-Pd bridges. Speech was scored higher for the lateral than for the
frontal bridges. Patients evaluated the health of the tissue surrounding their bridges,
overall quality of fixed prosthodontic appliance and aesthetics with significantly higher
scores than the prosthodontist (p < 0.01). The results point at a difference between the
patientās and the therapist\u27s evaluations and to the patient\u27s insufficient care about the
gingiva around the bridge abutments
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