scholarly journals An automatic tooth preparation technique: A preliminary study

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Fusong Yuan ◽  
Yong Wang ◽  
Yaopeng Zhang ◽  
Yuchun Sun ◽  
Dangxiao Wang ◽  
...  
Keyword(s):  
Preparation Technique ◽  
Preliminary Study ◽  
Tooth Preparation

scholarly journals Minimal invasive microscopic tooth preparation in esthetic restoration: a specialist consensus

2019 ◽  
Vol 11 (3) ◽  
Author(s):  
Haiyang Yu ◽  
Yuwei Zhao ◽  
Junying Li ◽  
Tian Luo ◽  
Jing Gao ◽  
...  
Keyword(s):  
Minimally Invasive ◽  
Critical Role ◽  
Minimal Invasive ◽  
Therapeutic Effects ◽  
Preparation Technique ◽  
Finish Line ◽  
Physiological Basis ◽  
Core Elements ◽  
Tooth Preparation

Abstract By removing a part of the structure, the tooth preparation provides restorative space, bonding surface, and finish line for various restorations on abutment. Preparation technique plays critical role in achieving the optimal result of tooth preparation. With successful application of microscope in endodontics for >30 years, there is a full expectation of microscopic dentistry. However, as relatively little progress has been made in the application of microscopic dentistry in prosthodontics, the following assumptions have been proposed: Is it suitable to choose the tooth preparation technique under the naked eye in the microscopic vision? Is there a more accurate preparation technology intended for the microscope? To obtain long-term stable therapeutic effects, is it much easier to achieve maximum tooth preservation and retinal protection and maintain periodontal tissue and oral function health under microscopic vision? Whether the microscopic prosthodontics is a gimmick or a breakthrough in obtaining an ideal tooth preparation should be resolved in microscopic tooth preparation. This article attempts to illustrate the concept, core elements, and indications of microscopic minimally invasive tooth preparation, physiological basis of dental pulp, periodontium and functions involved in tool preparation, position ergonomics and visual basis for dentists, comparison of tooth preparation by naked eyes and a microscope, and comparison of different designs of microscopic minimally invasive tooth preparation techniques. Furthermore, a clinical protocol for microscopic minimally invasive tooth preparation based on target restorative space guide plate has been put forward and new insights on the quantity and shape of microscopic minimally invasive tooth preparation has been provided.

scholarly journals Mock-up: An Aid in the Different Steps in Aesthetic Dental Treatment

2016 ◽  
Vol 12 (6) ◽  
pp. 290
Author(s):  
Rozafa Dragusha ◽  
Djemal Ibraimi
Keyword(s):  
Treatment Planning ◽  
Dental Treatment ◽  
Practical Method ◽  
Minimal Invasive ◽  
Preparation Technique ◽  
Technical Problems ◽  
Planning Step ◽  
Tooth Preparation ◽  
Aesthetic Dentistry ◽  
Communication Planning

Today, in restorative and prosthodontic dental treatments, the focus is on aesthetics. This involves meeting the needs and expectations of the patient. Failures occur not only as a result of technical problems, but also as a result of poor communication with the patient. To avoid these scenarios that may obligate us to repeat the restoration from the beginning, we can obtain help by using Mock-up. Despite communication with the diagnostic and treatment planning step, Mock-up enables us to control the function of the end result without even beginning the work. It also enables us to do a minimal invasive tooth preparation. The aim of this study is to use Mock-up to show its effectiveness in communication, planning, and preparation to achieve the demanded aesthetic dental treatment. Materials and Methods: We prepared mock-up according to wax-up in the second meeting- the treatment planning step. We used a minimal invasive, mock-up guided, preparation technique from the Mock-up accepted by us and the patient. Results: This easy and practical method enabled us to avoid the intervention in the ultimate restoration. Our result is in accordance with those of other authors: we had minimal preparation, even some unprepared surfaces and satisfied patient. Conclusions: The use of Mock-up is a simple technique in aesthetic dentistry. Broadly in prosthodontics, it assures us that the work will be functionally and aesthetically successful.

scholarly journals Optimization of scanning electron microscope technique for amniotic membrane investigation: A preliminary study

2018 ◽  
Vol 12 (04) ◽  
pp. 574-578
Author(s):  
Saaid Al Shehadat ◽  
Mehmet Omer Gorduysus ◽  
Suzina Sheikh Abdul Hamid ◽  
Nurul Asma Abdullah ◽  
Abdul Rani Samsudin ◽  
...  
Keyword(s):  
Stem Cells ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Amniotic Membrane ◽  
Human Amniotic Membrane ◽  
Preparation Technique ◽  
Sem Images ◽  
Preliminary Study ◽  
Intact Surface ◽  
Scanning Electron

ABSTRACTObjective: The objective of this study was to evaluate and compare the two scanning electron microscope (SEM) preparation protocols and determine the better SEM preparation technique to study stem cells on human amniotic membrane (hAM) scaffold. Materials and Methods: Formaldehyde-based protocol and glutaraldehyde-based protocol were compared to evaluate the quality of SEM images for stem cells cultured on hAM scaffold. Results: The results suggested that formaldehyde-based protocol is better than glutaraldehyde-based protocol in terms of showing clearer topography of the membrane as well as the boarders of the cells. To provide intact surface of the SEM sample and avoid possible ruptures of the hAM or the thin cell layer, it is recommended to perform the dehydration step using graded alcohol concentrations of 20%, 30%, 40%, 50%, 60%, 70%, 80%, and 90%, one time for each and twice in 100% for 10 min each. Gold sputter-coating step is not recommended as it does not improve the image quality. Conclusions: To obtain clear SEM images, it is recommended to run a preliminary study to determine the better chemicals and conditions of sample preparation even when following preexisting protocols.

A preliminary study on a tooth preparation robot

2019 ◽  
Vol 119 (5-6) ◽  
pp. 332-337
Author(s):  
Fusong Yuan ◽  
Peijun Lyu
Keyword(s):  
Preliminary Study ◽  
Tooth Preparation

The Ultrastructure of Metastatic Human Mammary Carcinoma After Prolonged Estrogen Therapy

1967 ◽  
Vol 25 ◽  
pp. 180-181
Author(s):  
John H.L. Watson ◽  
John L. Swedo ◽  
R.W. Talley
Keyword(s):  
Mammary Carcinoma ◽  
Osmium Tetroxide ◽  
Estrogen Therapy ◽  
Ultrastructural Level ◽  
Uranyl Acetate ◽  
Human Mammary Carcinoma ◽  
Surgical Biopsy ◽  
Lead Hydroxide ◽  
Preliminary Study ◽  
Hormonal Therapies

A preliminary study of human mammary carcinoma on the ultrastructural level is reported for a metastatic, subcutaneous nodule, obtained as a surgical biopsy. The patient's tumor had responded favorably to a series of hormonal therapies, including androgens, estrogens, progestins, and corticoids for recurring nodules over eight years. The pertinent nodule was removed from the region of the gluteal maximus, two weeks following stilbestrol therapy. It was about 1.5 cms in diameter, and was located within the dermis. Pieces from it were fixed immediately in cold fixatives: phosphate buffered osmium tetroxide, glutaraldehyde, and paraformaldehyde. Embedment in each case was in Vestopal W. Contrasting was done with combinations of uranyl acetate and lead hydroxide.

Contrast from epitaxially sandwiched macromolecules

1978 ◽  
Vol 36 (2) ◽  
pp. 226-227
Author(s):  
M. Talianker ◽  
D.G. Brandon
Keyword(s):  
Gold Film ◽  
Lattice Defect ◽  
Gold Foil ◽  
Specimen Preparation ◽  
Preparation Technique ◽  
Resolution Limit ◽  
Transmission Electron ◽  
Crystal Lattice Defect ◽  
Void Effect ◽  
Lattice Resolution

A new specimen preparation technique for visualizing macromolecules by conventional transmission electron microscopy has been developed. In this technique the biopolymer-molecule is embedded in a thin monocrystalline gold foil. Such embedding can be performed in the following way: the biopolymer is deposited on an epitaxially-grown thin single-crystal gold film. The molecule is then occluded by further epitaxial growth. In such an epitaxial sandwich an occluded molecule is expected to behave as a crystal-lattice defect and give rise to contrast in the electron microscope.The resolution of the method should be limited only by the precision with which the epitaxially grown gold reflects the details of the molecular structure and, in favorable cases, can approach the lattice resolution limit.In order to estimate the strength of the contrast due to the void-effect arising from occlusion of the DNA-molecule in a gold crystal some calculations were performed.

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