Construction of complete denture with adequate retention is a complex procedure. Use of suction cup in a maxillary denture is one of the techniques to improve retention. Palatal Suction cup, which provides high retention by inducing negative pressure on the mucosal surface, is not being recommended because of its pathological effect on the palatal tissues leading to palatal perforation. Surgical closure of palatal perforation is challenging, technique sensitive, and it can be achieved by different surgical methods depending on the size and location of the defect. In this case report, we present a patient with palatal perforation due to prolonged use of a denture with a suction cup for over 10 years, which was surgically closed by a palatal rotational flap. The result was good as the defect was successfully closed and the donor site healed uneventfully.
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http://dx.doi.org/10.4103/2141-9248.181842 | DOI Listing |
Front Robot AI
December 2024
School of Mechanical Engineering, Zhejiang Sci-Tech University, Hangzhou, Zhejiang, China.
To address the problems of the labeling curved surfaces vegetable with long label, such as the label wrinkled and the easy detachment, a cam-elliptical gear combined labeling mechanism with an improved hypocycloid trajectory is proposed. Provide the process of the mechanism, and establish a kinematic model of the mechanism. In order to improve the motion performances of the cam-elliptical gear combined labeling mechanism and avoid labels damage, the NSGA-II algorithm is used to optimize the parameters of the mechanism, resulting in 80 sets of Pareto solutions.
View Article and Find Full Text PDFAnn Biomed Eng
December 2024
Biomedical Engineering and Health Systems, KTH Royal Institute of Technology, Stockholm, Sweden.
Vacuum-assisted delivery (VAD) uses a vacuum cup on the fetal scalp to apply traction during uterine contractions, assisting complicated vaginal deliveries. Despite its widespread use, VAD presents a higher risk of neonatal morbidity compared to natural vaginal delivery and biomechanical evidence for safe VAD traction forces is still limited. The aim of this study is to develop and assess the feasibility of an experimental VAD testing setup, and investigate the impact of traction forces on fetal brain deformation.
View Article and Find Full Text PDFSea pens (Superfamily Pennatuloidea) are a specialized group of octocorals that evolved to live embedded in a soft-sedimented seafloor using their peduncles as anchors. Rock-inhabiting sea pens ("rock pens") were first described in 2011; their peduncle is modified into a suction cup-like structure that allows them to attach onto the surface of hard substrates, an adaptation previously unknown in sea pens. There are currently four species that have been identified as rock pens based on their peduncular morphology: three of these are in the genus Anthoptilum (Anthoptilidae), and one in the genus Calibelemnon (Scleroptilidae).
View Article and Find Full Text PDFBioinspir Biomim
December 2024
Institute of Intelligent Machines, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, People's Republic of China.
The exploration of adaptive robotic systems capable of performing complex tasks in unstructured environments, such as underwater salvage operations, presents a significant challenge. Traditional rigid grippers often struggle with adaptability, whereas bioinspired soft grippers offer enhanced flexibility and adaptability to varied object shapes. In this study, we present a novel bioinspired soft robotic gripper integrated with a shape memory alloy (SMA) actuated suction cup, inspired by the versatile grasping strategies of octopus arms and suckers.
View Article and Find Full Text PDFSensors (Basel)
October 2024
Faculty of Electrical Engineering, University of Ljubljana, Tržaška Cesta 25, 1000 Ljubljana, Slovenia.
With the advent of robotics and artificial intelligence, the potential for automating tasks within human-centric environments has increased significantly. This is particularly relevant in the retail sector where the demand for efficient operations and the shortage of labor drive the need for rapid advancements in robot-based technologies. Densely packed retail shelves pose unique challenges for robotic manipulation and detection due to limited space and diverse object shapes.
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