The Influence of Fine Surface Structures on the Osseo-integration of Implants

1982 ◽  
Vol 5 (3) ◽  
pp. 207-212 ◽  
Author(s):  
G. Heimke ◽  
W. Schulte ◽  
B. d'Hoedt ◽  
P. Griss ◽  
C.M. Büsing ◽  
...  
Keyword(s):  
Dental Implants ◽  
Surface Structures ◽  
Bony Tissue ◽  
General Validity ◽  
Load Transmission ◽  
Load Line ◽  
Fine Surface

The availability of inert materials like dense, pure Al-2O3-ceramic or titanium allows the study of purely biomechanical influences of surface modulations or lacune on the osseo-integration of implants at different locations of the skeleton. The discovery of the «load-line-shadow» phenomenon in lacune of dental implants and the observation of the same effect in the grooves of hip sockets (Lindenhof type) indicate the general validity of the rules controlling the remodelling ability of bony tissue. Their application to the problems concerned with load transmission via surfaces which are mainly loaded by shear can contribute to achieve a well defined anchorage of implants.

Evaluation of Osseointegration in Implants using Digital Orthopantomogram and Cone Beam Computed Tomography

2016 ◽  
Vol 17 (11) ◽  
pp. 953-957 ◽  
Author(s):  
Shameeka Thopte ◽  
Aastha Chopra ◽  
Amit A Mhapuskar ◽  
Swati Marathe ◽  
Shams U Nisa ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Dental Implants ◽  
Cone Beam Computed Tomography ◽  
Cone Beam ◽  
Accurate Assessment ◽  
Bony Tissue ◽  
Apical Portion ◽  
Implant Placement ◽  
Radiographic Measurements ◽  
Bone Height

ABSTRACT Introduction Accurate assessment of osseointegration in dental implants requires precise radiographic visualization of pathologic conditions as well as anatomical structures. The present study aimed to evaluate the formation of bony tissue (osseointegration) using digital orthopantomogram (OPG) and cone beam computed tomography (CBCT) immediately after implant insertion (within 7 days) and 3 months postinsertion. Materials and methods Twenty single-implant sites on mandibular posterior regions were selected on patients irrespective of their gender. Both digital OPG and CBCT were done within a week and again after 3 months of implant insertion surgery, using the same exposure parameters. Results Three of the 20 implants were submerged and were excluded as the crestal bone height could not be measured. The participants were recalled for radiographic measurements after 3 months of implant placement. On an average, there was 0.03 mm of osseointegration at the apical portion after 3 months of implant insertion on digital OPG; 0.04 mm of osseointegration at the crestal bone height after 3 months on digital OPG; and 0.01 mm of osseointegration at the apical portion after 3 months on CBCT. No change or ≤0.02 mm of osseointegration at crestal bone height after 3 months on CBCT. Conclusion Both digital OPG and CBCT are significant for the assessment of osseointegration in implants, and hence, endow definite benefit for accurate assessment in terms of the success of the implant placement. Clinical significance However, CBCT is a better mode of evaluating dental implants but one should keep in mind that radiographic examination must be conducted to the benefit of the patient by application of the lowest achievable dose. How to cite this article Chopra A, Mhapuskar AA, Marathe S, Nisa SU, Thopte S, Saddiwal R. Evaluation of Osseointegration in Implants using Digital Orthopantomogram and Cone Beam Computed Tomography. J Contemp Dent Pract 2016;17(11):953-957.

Minute protrusions of the cuticle: Fine surface structures of the tunic in ascidians

1990 ◽  
Vol 204 (1) ◽  
pp. 67-73 ◽  
Author(s):  
Euichi Hirose ◽  
Yasunori Saito ◽  
Hiroshi Watanabe ◽  
Koichiro Hashimoto
Keyword(s):  
Surface Structures ◽  
Fine Surface

Paper 5: The Effect of Journal Misalignment on the Performance of a Journal Bearing under Steady Running Conditions

1966 ◽  
Vol 181 (2) ◽  
pp. 45-54 ◽  
Author(s):  
A. J. Smalley ◽  
H. McCallion
Keyword(s):  
Load Capacity ◽  
Full Range ◽  
Axial Direction ◽  
Friction Torque ◽  
General Validity ◽  
Load Line ◽  
Oil Flow ◽  
Method Of Solution ◽  
Two Parameters ◽  
Journal Misalignment

A method of solution is described in which the governing equation is modified to account for variations in the oil-film thickness in the axial direction owing to journal misalignment. The position of the journal is specified by means of its eccentricity at its mid-length and by two parameters defining the extent and direction of the misalignment. The pressure distribution is evaluated numerically, and the direct load, friction torque, oil flow, and couple arising from the misalignment of the journal are obtained by numerical integration. A full range of journal misalignment conditions is examined for two length-diameter ratios. Results are presented in the form of non-dimensionalized graphs, showing the variation of direct load and misalignment couple with the journal misalignment parameters described. The angle between the line of action of the misalignment couple and the load line is evaluated in each instance, and graphs are presented to show the variation of the performance parameters for a particular degree of misalignment with the direction of application of the couple. Results for the particular instances in which the couple is in line with or at right angles to the load line are extracted, and these are compared with published experimental results of other workers. Good agreement is obtained, and moreover it is shown that, in general, these are not the two extremes of misalignment. For these two conditions design charts are presented, whereby, from knowledge of the applied couple and direct load, the degree of misalignment and the resultant peak pressure parameter may be determined. Charts which illustrate the reduction in load capacity for a particular journal misalignment in the plane of the load are also presented. General validity is claimed for this method of exploring a relatively unexamined subject, and the results are considered by the authors to be a useful improvement on those obtained by previous analytical workers.

Close-Operation Overvoltage of No-Load Transmission Line with Fault Current Limiter

2014 ◽  
Vol 672-674 ◽  
pp. 1373-1379
Author(s):  
Hong Shun Liu ◽  
Ting Ting Lv ◽  
Ming Ming Han ◽  
Liang Zou ◽  
Li Zhang ◽  
...  
Keyword(s):  
Transmission Line ◽  
Oscillation Period ◽  
Fault Current ◽  
Fault Current Limiter ◽  
Fundamental Component ◽  
Load Transmission ◽  
Series Resonance ◽  
Load Line ◽  
Current Limiter ◽  
Component Amplitude

The comprehensive impacts of series resonance type fault current limiter (FCL) on power system need further investigation and verification. With regard to switching on 500kV EHV no-load transmission line, the instantaneous peak value, the free component oscillation frequency, the fundamental component amplitude and free component amplitude of terminal overvoltage waveform are simulated with and without installation of FCL considering different switching times. The relationship curves of free component oscillation period, the fundamental component amplitude and free component amplitude are gotten respectively by simulation results. The law of the influence of different fault current limiting reactance on terminal voltage of switching on no-load line is also summarized. The analysis results show that the installation of FCL is benefit for switching on no-load line.

scholarly journals The fine structures of Cystocaulus ocreatus (Nematoda: Protostrongylidae) and the related lung pathology

2006 ◽  
Vol 43 (4) ◽  
pp. 208-212 ◽  
Author(s):  
K. Yildiz ◽  
S. Karahan ◽  
K. Cavusoglu
Keyword(s):  
Mouth Opening ◽  
Surface Structures ◽  
Lung Pathology ◽  
Female Parasite ◽  
Fine Surface ◽  
Electron And Light Microscopy ◽  
Male Parasite ◽  
Fine Structures ◽  
Eggs And Larvae ◽  
Scanning Electron

AbstractIn the present study, the fine surface structures of Cystocaulus ocreatus and its worm as well as brood nodules obtained from the lung of Akkaraman sheep are demonstrated by scanning electron and light microscopy. The mouth of the parasite obtained from the worm nodules is located at the anterior tip and encircled by a collar of tissue. The mouth opening appears as three slits conjoined in the shape of a capital case letter Y, creating three lips. The mouth is surrounded by six papillae just behind the collar. The anterior end was similar in both sexes and covered by numerous wrinkles. Female parasite has a bell-shaped pro-vagina. The posterior end of the female parasite was sharply pointed. The male parasite has a bursa. In the worm nodule, curled parasites were enclosed by a capsula and no eggs and larvae of the parasite were observed. In the brood nodule, heavily affected alveoli and bronchioles contained excessive amounts of larvae and eggs.

Fine Surface Structures Influencing on Liquid Quenching

2020 ◽  
Vol 75 (3) ◽  
pp. 137-151
Author(s):  
R. Steuer ◽  
N. Kozlov ◽  
O. Keßler
Keyword(s):  
Surface Structures ◽  
Liquid Quenching ◽  
Fine Surface

A Pig Model for the Histomorphometric Evaluation of Hard Tissue Around Dental Implants

2013 ◽  
Vol 39 (5) ◽  
pp. 551-557 ◽  
Author(s):  
Özgür Erdogan ◽  
Yakup Üstün ◽  
Ufuk Tatli ◽  
Ibrahim Damlar ◽  
Kenan Daglıoglu
Keyword(s):  
Animal Model ◽  
Dental Implants ◽  
Dental Implant ◽  
Bone Microarchitecture ◽  
Frontal Bone ◽  
Bony Tissue ◽  
Domestic Pigs ◽  
Implant Placement ◽  
Suitable Animal Model ◽  
Bone To Implant Contact

This study aimed to evaluate the frontal bone of Swiss Domestic pigs as an animal model for the histologic-histomorphometric examination of bony tissue around dental implants. We inserted SLA surface implants 4.1 mm in diameter and 10 mm in length into the frontal bones of 9 Swiss-Domestic pigs. Histologic and histomorphometric studies were conducted on the undecalcified sections. Histologic examinations showed that the specimens contain a sufficient amount of bone to provide homogenous bone coverage for standard diameter dental implant placement. The mean bone to implant contact was 61.9% ± 8.7%. Other histomorphometric parameters revealed the regular trabecular architecture at this site. Pigs' frontal bone appears to be a suitable animal model in short-term dental implant studies because it provides a sufficient amount of bone and favorable bone microarchitecture.

Scanning and Transmission Microscopy of Nematocyst Batteries in Epitheliomuscular Cells of Hydra

1971 ◽  
Vol 29 ◽  
pp. 410-411 ◽  
Author(s):  
Jane A. Westfall ◽  
S. Yamataka ◽  
Paul D. Enos
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Osmium Tetroxide ◽  
External Surface ◽  
Three Dimensional ◽  
Surface Structures ◽  
Transmission Microscopy ◽  
Transmission Electron ◽  
Freeze Dried ◽  
Scanning Electron

Scanning electron microscopy (SEM) provides three dimensional details of external surface structures and supplements ultrastructural information provided by transmission electron microscopy (TEM). Animals composed of watery jellylike tissues such as hydras and other coelenterates have not been considered suitable for SEM studies because of the difficulty in preserving such organisms in a normal state. This study demonstrates 1) the successful use of SEM on such tissue, and 2) the unique arrangement of batteries of nematocysts within large epitheliomuscular cells on tentacles of Hydra littoralis.Whole specimens of Hydra were prepared for SEM (Figs. 1 and 2) by the fix, freeze-dry, coat technique of Small and Màrszalek. The specimens were fixed in osmium tetroxide and mercuric chloride, freeze-dried in vacuo on a prechilled 1 Kg brass block, and coated with gold-palladium. Tissues for TEM (Figs. 3 and 4) were fixed in glutaraldehyde followed by osmium tetroxide. Scanning micrographs were taken on a Cambridge Stereoscan Mark II A microscope at 10 KV and transmission micrographs were taken on an RCA EMU 3G microscope (Fig. 3) or on a Hitachi HU 11B microscope (Fig. 4).

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