386 research outputs found
Implanto-Prosthetic Rehabilitation of the Mandible by Means of Two Implants
Edentulousness is a considerable problem in Croatia. So far prevention has not become the most important part of the dental profession. On the other hand,poor medical knowledge, reduced rights concerning health insurance costs as well as an increasing number of impoverished people in Croatia has resulted in postponed prosthetic rehabilitation. For the above mentioned reasons the Croatian people suffer from premature loss of their teeth. Also lower jaw atrophy occurs, which makes prosthetic rehabilitation even more difficult to achieve. In spite of some disadvantages, the double-implant borne prosthetic suprastructure has proved to be a simple
and good solution to the patient\u27s problem, mainly because it is cost-effective. This particularly applies to Croatia patients. Over the last five years we have placed double -implants in 26 patients, in the anterior region of the mandible. The implants were placed in the region of the lower canine or slightly more mesially. Severe atrophy
was determined in 13 patients (50%) which impeded their complete denture wearing even before the implant placement started. However, we made up for the loss in two patients by placing the implants again. This time we placed them slightly more mesially.
We made one borne implant complete denture for one patient because the examination revealed severe atrophy in one segment of his mandible. In addition since the osseointegration prognosis for this patient was questionable we decided against any additional surgical treatment. Since the belts of the attached gingiva in our patients were wide enough and the diameters of the implants were not very long, no vestibuloplasty was necessary. We installed
ITI, IMZ, ASTRA and Ankylos implants. All systems proved to be equally functional
Implanto-Prosthetic Rehabilitation of the Mandible by Means of Two Implants
Edentulousness is a considerable problem in Croatia. So far prevention has not become the most important part of the dental profession. On the other hand,poor medical knowledge, reduced rights concerning health insurance costs as well as an increasing number of impoverished people in Croatia has resulted in postponed prosthetic rehabilitation. For the above mentioned reasons the Croatian people suffer from premature loss of their teeth. Also lower jaw atrophy occurs, which makes prosthetic rehabilitation even more difficult to achieve. In spite of some disadvantages, the double-implant borne prosthetic suprastructure has proved to be a simple
and good solution to the patient\u27s problem, mainly because it is cost-effective. This particularly applies to Croatia patients. Over the last five years we have placed double -implants in 26 patients, in the anterior region of the mandible. The implants were placed in the region of the lower canine or slightly more mesially. Severe atrophy
was determined in 13 patients (50%) which impeded their complete denture wearing even before the implant placement started. However, we made up for the loss in two patients by placing the implants again. This time we placed them slightly more mesially.
We made one borne implant complete denture for one patient because the examination revealed severe atrophy in one segment of his mandible. In addition since the osseointegration prognosis for this patient was questionable we decided against any additional surgical treatment. Since the belts of the attached gingiva in our patients were wide enough and the diameters of the implants were not very long, no vestibuloplasty was necessary. We installed
ITI, IMZ, ASTRA and Ankylos implants. All systems proved to be equally functional
Tooth Morphology in Function of Selfprotective Mechanism
The degree of curvature of vestibular and oral tooth surfaces is determined by the
shape sequence from the tooth crown to the epithelial attachment and the alveolar bone,
and directly influences the health of gingiva and the entire tooth support system. The
goal of this research was to determine vestibulo-oral planes of upper and lower permanent
premolars and molars and the thickness of the associated alveolar osseous wall,
and 2,727 measurings were processed using pertinent statistical procedures. The results
have shown the degree of curvature of vestibular and oral tooth surfaces to be higher in
upper teeth than in lower ones (p>0.05); vestibular convexities higher than oral ones
and especially noticeable at the junction from the meandle to the lower third of the
crown. Higher vestibular curvature also entailed thicker osseous wall. All results were
higher than the ones found in literature. We consider our results to be relevant for our
population. The research on the relationship of teeth and the alveolar bone should be
continued by using even more test points and more sophisticated research procedures
Foramen Mandibulae as an Indicator of Successful Conduction Anesthesia
Comparative measurements were made of 144 orthopantomographs in 50 patients
with successful and 94 patients with unsuccessful inferior alveolar nerve block anesthesia.
The results show that the bony lingula is prominent in 28.5% of all patients, or in
56.0% of those with unsuccessful anesthesia. The variables mandibular notch vs. mandibular
foramen (MN-MF) and the anterior ramus ridge vs. mandibular foramen
(ARR-MF) show greater distances in the group of patients with successful anesthesia,
while the variables of posterior ramus ridge vs. mandibular foramen (PRR-MF) and
mandibular angle vs. mandibular foramen (MA-MF) were greater in the group of patients
with unsuccessful anesthesia (p > 0.05). It is concluded that the variability in position
of the mandibular foramen among others may be responsible for an occasional
failure of inferior alveolar nerve block
Fast neurotransmitter release regulated by the endocytic scaffold intersectin.
Sustained fast neurotransmission requires the rapid replenishment of release-ready synaptic vesicles (SVs) at presynaptic active zones. Although the machineries for exocytic fusion and for subsequent endocytic membrane retrieval have been well characterized, little is known about the mechanisms underlying the rapid recruitment of SVs to release sites. Here we show that the Down syndrome-associated endocytic scaffold protein intersectin 1 is a crucial factor for the recruitment of release-ready SVs. Genetic deletion of intersectin 1 expression or acute interference with intersectin function inhibited the replenishment of release-ready vesicles, resulting in short-term depression, without significantly affecting the rate of endocytic membrane retrieval. Acute perturbation experiments suggest that intersectin-mediated vesicle replenishment involves the association of intersectin with the fissioning enzyme dynamin and with the actin regulatory GTPase CDC42. Our data indicate a role for the endocytic scaffold intersectin in fast neurotransmitter release, which may be of prime importance for information processing in the brain
On Coloring Resilient Graphs
We introduce a new notion of resilience for constraint satisfaction problems,
with the goal of more precisely determining the boundary between NP-hardness
and the existence of efficient algorithms for resilient instances. In
particular, we study -resiliently -colorable graphs, which are those
-colorable graphs that remain -colorable even after the addition of any
new edges. We prove lower bounds on the NP-hardness of coloring resiliently
colorable graphs, and provide an algorithm that colors sufficiently resilient
graphs. We also analyze the corresponding notion of resilience for -SAT.
This notion of resilience suggests an array of open questions for graph
coloring and other combinatorial problems.Comment: Appearing in MFCS 201
Automated Classification of Airborne Laser Scanning Point Clouds
Making sense of the physical world has always been at the core of mapping. Up
until recently, this has always dependent on using the human eye. Using
airborne lasers, it has become possible to quickly "see" more of the world in
many more dimensions. The resulting enormous point clouds serve as data sources
for applications far beyond the original mapping purposes ranging from flooding
protection and forestry to threat mitigation. In order to process these large
quantities of data, novel methods are required. In this contribution, we
develop models to automatically classify ground cover and soil types. Using the
logic of machine learning, we critically review the advantages of supervised
and unsupervised methods. Focusing on decision trees, we improve accuracy by
including beam vector components and using a genetic algorithm. We find that
our approach delivers consistently high quality classifications, surpassing
classical methods
RAFT: Recurrent All-Pairs Field Transforms for Optical Flow
We introduce Recurrent All-Pairs Field Transforms (RAFT), a new deep network
architecture for optical flow. RAFT extracts per-pixel features, builds
multi-scale 4D correlation volumes for all pairs of pixels, and iteratively
updates a flow field through a recurrent unit that performs lookups on the
correlation volumes. RAFT achieves state-of-the-art performance. On KITTI, RAFT
achieves an F1-all error of 5.10%, a 16% error reduction from the best
published result (6.10%). On Sintel (final pass), RAFT obtains an
end-point-error of 2.855 pixels, a 30% error reduction from the best published
result (4.098 pixels). In addition, RAFT has strong cross-dataset
generalization as well as high efficiency in inference time, training speed,
and parameter count. Code is available at https://github.com/princeton-vl/RAFT.Comment: fixed a formatting issue, Eq 7. no change in conten
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