Tactile Sensibility of Natural Teeth and Osseointegrated Dental Implants to Loading

2015 ◽  
Vol 15 (1) ◽  
pp. 58-62
Author(s):  
Linards Grieznis ◽  
Peteris Apse ◽  
Leons Blumfelds
Keyword(s):  
Dental Implants ◽  
Vertical Axis ◽  
Point Of View ◽  
Endodontically Treated Teeth ◽  
Tactile Sensibility ◽  
Mean Values ◽  
Osseointegrated Implants ◽  
Tactile Threshold ◽  
Natural Teeth ◽  
The Mean

SummaryIntroduction. Dental implant therapy has become a popular method of replacing one or more missing teeth. Osseointegrated dental implants have been studied from histological, microbiologic and biomechanical point of view, but the neurophysiologic integration of the implants and the supported prostheses has received less attention. The sensory mechanism of dental implants is qualitatively different from that of natural teeth. Psychophysiological tests are used to determine the tactile sensibility perceived with the implants and teeth.Aim of the study. The purpose of this study was to compare tactile sensibility of natural teeth and osseointegrated dental implants.Material and methods. Forty-three patients were included in the study. Natural teeth were divided into two groups: non endodontically treated teeth (NETT) and endodontically treated teeth (ETT). Load tests were done by a computer-controlled pressure sensitive device („Power Lab“ Data Acquisition System - model 4/25T, sensor - model MLT003/D; ADInstruments), specially modified for intraoral use. Pushing forces were applied parallel to the vertical axis of teeth and implants. The patient held a signal button which he/she activated as soon as touch was sensed. At this moment the computer registered passive absolute tactile threshold - measured in Newtons. The mean values of passive absolute tactile threshold for natural teeth and dental implants were calculated. Comparison of the mean values was performed by the means of t-test.Results. Passive absolute tactile threshold for osseointegrated dental implants was 2.39 N (SD=1.92), and for teeth - 0.67 N (SD=0.72), for non endodontically treated teeth it was 0.63 N (SD=0.72) and for endodontically treated teeth - 0.73 N (SD=0.69). The differences in mean values were statistically significant (p<0,0001) except for mean values of NETT vs. ETT.Conclusion. This study shows that patients with osseointegrated implants subjectively feel “touch” sensation when greater force is applied compared with natural teeth.

Osseointegrated Implants: A Comprehensive Review

2021 ◽  
Vol 2 (1) ◽  
pp. 24-30
Author(s):  
Matheus Marquez Cruvinel Santos ◽  
◽  
Flávio Barros da Silva ◽  
Idiberto José Zotarelli-Filho ◽  
Elias Naim Kassis ◽  
...  
Keyword(s):  
Dental Implants ◽  
Pharmacological Action ◽  
World Health Organisation ◽  
World Health ◽  
Density Level ◽  
Mineral Density ◽  
Osseointegrated Implants ◽  
Bone Mineral Density Level ◽  
The Mean ◽  
Normal Women

The most common bone disorder found by implant dentists is osteoporosis, which is a systemic skeletal disorder associated with aging, which is characterized by loss of bone mass, making bones fragile and more susceptible to fractures. The World Health Organisation has defined osteoporosis as a bone mineral density level greater than 2.5 standard deviations below the mean of young normal women. After 60 years of age, a third of the population have this disorder, it occurs twice as often in women than in men. It is estimated that 1.3 million fractures and 133,000 all hip fractures occur every year as a result of osteoporosis. This study aimed to discuss aspects of the pharmacological action of Bisphosphonates (BP) and their influence on the bone tissue when associated with treatment with dental implants. There are several types of treatments that prevent or prevent the progression of osteoporosis. So, BP, such as alendronate, are inhibitors of bone resorption. Act as controlling the development of osteoporosis by increasing the process of bone density and decrease its reabsorption, often acting as supporting the process of osseointegration of dental implants.

Assessment of Myeloperoxidase and Nitric Levels around Dental Implants and Natural Teeth as a Marker of Inflammation: A Comparative Study

2016 ◽  
Vol 17 (11) ◽  
pp. 934-938 ◽  
Author(s):  
Manish Kumar ◽  
Gayithri H Kulkarni ◽  
Prashant Jadhav ◽  
Kiran Kulkarni ◽  
Sachin V Shinde ◽  
...  
Keyword(s):  
Comparative Study ◽  
Dental Implants ◽  
Dental Implant ◽  
Plaque Index ◽  
Gingival Bleeding ◽  
Significant Difference ◽  
Inflammatory Processes ◽  
Natural Teeth ◽  
The Mean ◽  
Natural Tooth

ABSTRACT Introduction Dental implants form the mainstay of dental treatment involving rehabilitation of missing teeth. One of the major concerns for the clinicians doing dental implants is the postsurgical failure of dental implants. Success of dental implants is dependent upon the skills of the surgeon and the amount and quality of the bone remaining at the edentulous area where dental implant has to be placed. Myeloperoxidase (MPO) and nitrites are few of the enzymes and molecules which are said to be altered in inflammation. However, their exact role in the inflammatory processes around natural tooth and dental implant is still unclear. Hence we comparatively evaluated the levels of MPO and nitrites in the areas around the dental implants and natural teeth. Materials and methods The present study comprises 42 patients who underwent prosthetic rehabilitation by dental implants from 2011 to 2014. Depth of probing value (DP), score of plaque index (SPI), gingival index (GI), and index of gingival bleeding time (GBT) were evaluated for the assessment of the periimplant soft tissue changes. Assessment of inflammation around the dental implant surface and around natural tooth was done based on the readings of these parameters. For the measurement of the MPO levels, spectrophotometric MPO assay was used. All the results were analyzed by Statistical Package for the Social Sciences (SPSS) software. Results The mean plaque index values were 1.56 and 0.97 in periodontitis cases of natural teeth and inflamed cases of dental implants respectively. While comparing mean plaque index, mean probing depth, and mean gingival bleeding index in between the two groups, significant difference was obtained. Mean MPO concentration in periodontitis and gingivitis cases in natural teeth were 0.683 and 0.875 U/μL, while in inflamed dental implant cases, the mean value was 0.622 U/μL. While comparing the total MPO levels, total nitrite levels, and total nitrite concentration in between two study groups, significant difference was obtained. On comparing the healthy and periodontitis cases in natural teeth, significant difference was obtained. Conclusion In the inflammatory processes occurring around dental implant and natural teeth, MPO and NO make some amount of significant contribution. Clinical significance The present study enforces on the role of MPO and nitrite as diagnostic and prognostic marker. How to cite this article Kulkarni GH, Jadhav P, Kulkarni K, Shinde SV, Patil YB, Kumar M. Assessment of Myeloperoxidase and Nitric Levels around Dental Implants and Natural Teeth as a Marker of Inflammation: A Comparative Study. J Contemp Dent Pract 2016;17(11):934-938.

An Instrument for the Optimal Guiding of Osseointegrated Dental Implants

2004 ◽  
Vol 30 (4) ◽  
pp. 267-272 ◽  
Author(s):  
Gintaras Juodzbalys ◽  
Aune M. Raustia
Keyword(s):  
Dental Implants ◽  
Senior Author ◽  
Single Stage ◽  
Mean Deviation ◽  
Deviation Angle ◽  
Working Models ◽  
Osseointegrated Implants ◽  
The Mean ◽  
The Difference

Abstract The purpose of this study was to design an instrument for the optimal guiding of osseointegrated implants intraoperatively to achieve parallelism or desired angulations. Seven patients (4 males and 3 females) were enrolled in the investigation. They ranged in age from 44 to 61 years. Using an instrument designed by the senior author that permitted optimal guiding of the osteotomy instruments (33 Osteofix Oy, Oulu, Finland) we placed in these patients, root form, single stage implants. The difference in angulations between the first and the remaining implants was measured using the abutment replicas on the working models. It was found that the mean deviation angle between the first and the adjacent implant replicas was 2.2° (SD = 0.4°). The largest deviation angles were 2.3° (SD = 0.5°) and 3.1° (SD = 0.8°). The study indicated that the instrument had been designed in a functional manner and that all implants in such relationships can be inserted into their desired positions, either parallel to one another or with the desired angle for the planned prostheses.

scholarly journals Lightness, chroma, and hue distributions in natural teeth measured by a spectrophotometer

2017 ◽  
Vol 11 (01) ◽  
pp. 036-040 ◽  
Author(s):  
Teuta Pustina-Krasniqi ◽  
Kujtim Shala ◽  
Gloria Staka ◽  
Teuta Bicaj ◽  
Enis Ahmedi ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Lateral Incisor ◽  
Central Incisor ◽  
Tooth Color ◽  
Mean Values ◽  
Color Differences ◽  
Natural Teeth ◽  
The Mean ◽  
Clinically Significant ◽  
Made In

ABSTRACT Objective: The aim of the study was to analyze the distribution of color parameters, lightness (L*), chroma (C), hue (H), a* and b*, in the intercanine sector in maxilla. Material and Methods: Patients' tooth color measurements were performed using an intraoral spectrophotometer VITA Easyshade® (VITA Zahnfabrik H. Rauter GmbH and Co. KG, Bad Sackingen, Germany). The measurements were made in 255 subjects in the intercanine sector in maxilla. Results: The mean values for the group of 255 subjects were as follows: L*, a*, b*, C, and H as 81.6, 0.67, 21.6, 21.7, and 92.7, respectively. For F=206.27 and P < 0.001 between L*, a*, b*, C, H, and central incisor/lateral incisor/canines, there were statistically significant differences. Conclusion: With the statistical analysis, it was determined that there are significant color differences between the teeth of the intercanine sector, which differences are clinically significant also.

scholarly journals On the occurrence, origin, and intake of the nuclides, 210Po and 210Pb, in sclerotia of Wolfiporia cocos collected in China

2022 ◽  
Author(s):  
Dagmara Strumińska-Parulska ◽  
Jerzy Falandysz ◽  
Aleksandra Moniakowska
Keyword(s):  
Dry Weight ◽  
Point Of View ◽  
Raw Material ◽  
Radiological Protection ◽  
Radiation Doses ◽  
Mean Values ◽  
Medicinal Value ◽  
In The Wild ◽  
The Mean ◽  
Effective Radiation

Abstract The dried sclerotium of the fungus Wolfiporia cocos is edible and has medicinal value. This study aimed to understand the accumulation of radioactivity arising from the alpha 210Po, and beta-emitting 210Pb, in the sclerotium’s shell and core and assess a potential effective dose for consumers. Sclerotia were collected in the wild and from cultivars in China’s Anhui and Yunnan provinces. The mean values of 210Po activity concentration levels were 0.36 Bq kg−1 dry weight in the core and 12.0 Bq kg−1 dw in the shell; 210Pb activities were 0.43 and 9.84 Bq kg−1 dw, respectively. The potential effective radiation doses from core layers (as a major raw material of the sclerotium) ranged from 0.13 to 3.43 µSv kg−1 dw from 210Po decay and from 0.11 to 1.52 µSv kg−1 dw from 210Pb decay. Corresponding values for shell ranged from 0.80 to 42.4 for 210Po and from 0.53 to 13.6 µSv kg−1 dw for 210Pb. In general, the intake of W. cocos sclerotia varies between consumers, but this would not significantly change the effective radiation doses from 210Po and 210Pb isotopes. The consumption thus appears to be safe from a radiological protection point of view. Graphical abstract

Effect of a Multiporous Beta–Tricalicum Phosphate on Bone Density Around Dental Implants Inserted Into Fresh Extraction Sockets

2013 ◽  
Vol 39 (3) ◽  
pp. 339-344 ◽  
Author(s):  
Emad Tawfik Daif
Keyword(s):  
Bone Density ◽  
Dental Implants ◽  
Filling Material ◽  
Mean Values ◽  
Density Measurements ◽  
Pure Phase ◽  
Group A ◽  
The Mean ◽  
The Difference ◽  
Group B

The aim of this study was to assess, via multi-slice helical computerized tomography (CT), the influence of the pure-phase multiporous beta–tricalcium phosphate (beta-TCP) on bone density around dental implants inserted into fresh extraction sockets. Twenty-eight patients (18 women and 10 men), indicated for extraction of their lower premolars and insertion of immediate dental implants, were included in this study. They were randomly divided into two equal groups (14 patients each). Group A received immediate dental implants without any filling material around the implants, while in group B, a pure-phase multiporous beta-TCP was gently packed into the bone gaps around the implants. Three and 6 months after loading the implants, a CT, sagittal and coronal, was made to measure the bone density around the implants. The results of the current study have shown that the mean values of the bone density measurements around the implants in group A were 1150 ± 205 (range, 645–1460) at 3 months and 1245 ± 165 (range, 884–1650) at 6 months after loading the implants. In group B, the mean values of the bone density measurements around the implants were 1280 ± 320 (range, 876–1790) and 1490 ± 358 (range, 1061–1965) at 3 and 6 months after loading the implants, respectively. The statistical analysis of the collected data showed a significant increase in the bone density measurements from 3 to 6 months only in group B (P &lt; .05). Also, the difference between group A and B in the bone density measurements around the implants was statistically significant (P &lt; .05) at only 6 months after loading. On the basis of the results presented in this study, it may be possible to mention that the pure-phase multiporous beta-TCP may enhance the bone density when inserted into the bone gaps around immediate dental implants.

scholarly journals A Comparative Biometric Study of Albino and Coloured Guinea-pigs from the point of view of their Suitability for Experimental Use

1930 ◽  
Vol 30 (3) ◽  
pp. 311-330 ◽  
Author(s):  
G. W. Dunkin ◽  
P. Hartley ◽  
E. Lewis-Faning ◽  
W. T. Russell
Keyword(s):  
Guinea Pigs ◽  
Normal Weight ◽  
Point Of View ◽  
Reverse Direction ◽  
Mean Values ◽  
The Mean ◽  
The Difference ◽  
Experimental Use ◽  
Rates Of Growth ◽  
Apparent Influence

1. The average number of guinea-pigs born in albino litters is 3·000 as against 3·097 in the case of the mixed group, but the difference between the mean values is not statistically significant. Hence, it will be seen that there is little or no relationship between the colour of guinea-pigs and the number of their progeny.2. It may be said that there is a relationship between fertility and the period of the year. There is a tendency for fewer litters to be born during the quarter, January to March, and likewise for the fertility to be lowest during this period, as the mean number of births per litter is 2·65 for albino guineapigs and 2·67 for the mixed class, both values being significantly below the mean for the whole period.3. The mean weight of the albino guinea-pigs at birth is 81·2 ± 0·36 grm., the corresponding value for the cream, cream and white class is 82·6 ± 0·43, but the difference is of no statistical importance. Hence we conclude that the weight of a guinea-pig at birth is not affected by its colour. Once again attention is centred on the January–March quarter as the most unfavourable period, since there is a tendency for guinea-pigs of either colour born in these months to be below the normal weight.4. When allowance was made for the effects of selection on our data, there was no material difference between the rates of growth for the two types of guinea-pigs and, furthermore, the period of the year at which littering occurred exercised no apparent influence.5. The rate of mortality during the first thirteen days of life amongst albino guinea-pigs is 5·58 per 1000 per day, and amongst cream, cream and white guinea-pigs 4·73 per 1000 per day, but the difference probably represents nothing fundamental because, when the mortality is studied according to the size of the litter, the rates are sometimes in the reverse direction.6. Finally, there is, in the present data, nothing to suggest that albino guinea-pigs are as regards fertility, growth and mortality, significantly different from cream, cream and white guinea-pigs.

scholarly journals The transport of vorticity and heat through fluids in turbulent motion

1932 ◽  
Vol 135 (828) ◽  
pp. 685-702 ◽  
Keyword(s):  
Horizontal Plane ◽  
Vertical Axis ◽  
Rate Of Change ◽  
Mean Flow ◽  
Mean Velocity ◽  
Mean Values ◽  
Plane Element ◽  
The Mean ◽  
Coefficient Of Viscosity ◽  
Change In Mean

In Reynolds’ well-known theory of turbulent flow the effect of turbulence on the mean flow of a fluid is conceived as the same as that of a system of stresses which, like those due to viscosity, may have tangential as well as normal components across any plane element. Taking the case of laminar mean flow, that is when the mean flow is, say, horizontal and constant in direction and magnitude at any given height, the components of stress over a horizontal plane at height z are F x and F y where F x = — ρ uw — , F y = — ρ vw — , and u , v , w are the components of turbulent velocity parallel to two horizontal axes x and y and the vertical axis z . The bar denotes that mean values have been taken over a large horizontal area and ρ is the density of the fluid. The stress F x , is therefore due to the existence of a correlation between u and w. In the extension of Reynolds’ theory due to Prandtl this correlation depends on the rate of change in mean velocity. In its most simplified form the theory may be expressed as follows. A portion of fluid possessing the mean velocity of a level z 0 may be conceived to move upwards to a layer of height z 0 + l preserving the mean velocity U 0 of the layer from which it originated. At this height it is conceived to mix with its surroundings. If l is small the mean velocity of this layer is U 0 + l d U/ dz , U being the mean velocity at height z , so that u = — l d U/ dz , and hence F x = ρ wl — d U/ dz . The quantity ρ wl — is therefore of the same dimensions as viscosity and in Prandtl’s theory it is treated as though it were in fact a coefficient of viscosity, though not necessarily as one which has the same value at all points in the field.

scholarly journals Performance of Eucalyptus Clones in Auto and Allocompetition

2014 ◽  
Vol 63 (1-6) ◽  
pp. 9-14 ◽  
Author(s):  
Gustavo Salgado Martins ◽  
G. P. L. Moura ◽  
M. A. P. Ramalho ◽  
F. M. A. Gonçalves
Keyword(s):  
Competitive Ability ◽  
Minas Gerais ◽  
Point Of View ◽  
Diallel Crosses ◽  
Mean Values ◽  
Total Height ◽  
Breast Height ◽  
The Mean ◽  
Per Se

Abstract This study was performed to estimate the abilities of eucalyptus clones to exercise as well as to tolerate competition and to compare their behaviors under auto- or allocompetition. Six commercial clones, belonging to PLANTAR S/A enterprise were evaluated for breast height circumference (BHC), total height (TH) and volume (VOL). At three locations of Minas Gerais, Brazil (two in Curvelo and one in Felixlândia) the clones were planted in two spaces. At 36 months of age each clone was evaluated for exercising and toleration competition amongst each other. The design for each experiment was similar to that of the nine-hole system; the center clone being under competition and the eight surrounding the center clone exercising competition. Each clone under competition was repeated eight times; therefore, for each spacing and location, six contiguous experiments were conducted. From the mean values; the parameters of ability to exercise competition (ci), ability to tolerate competition (tj), the specific competitive ability (sij) and the performance per se of the clones (aj) were estimated using a model similar to that of diallel crosses. The clones differed as to their ci, tj and aj. No one clone exhibited high and positive ci and tj. Regardless of location, spacing, or clone, the performance of autocompetition is similar to that of allocompetition. This indicates that a mixture of clones, if advantageous from the management or industrial point of view, may be performed without harm to the volume of wood produced.

scholarly journals Functional optimality of personal the meaning of the profession

2020 ◽  
Vol 13 (1) ◽  
pp. 171-183 ◽  
Author(s):  
K.V. Karpinskii ◽  
T.V. Gizhuk ◽  
N.V. Kiselnikova
Keyword(s):  
Pearson Correlation ◽  
Statistical Processing ◽  
Point Of View ◽  
Personal Meaning ◽  
Mean Values ◽  
Correlation Criterion ◽  
The Mean ◽  
Scheffe Method ◽  
Post Hoc ◽  
Regulatory Functions

The purpose of this study was to determine the functional potential of various types of personal meaning of the profession. The article describes the results of an empirical study that involved a sample of 647 subjects. As methods of mathematical-statistical processing were used: the Pearson correlation criterion, one-way analysis of variance, followed by post hoc comparison of the mean values of groups by the Scheffe method, the criterion GT-Vegeliusa. The analysis made it possible to identify the optimal, suboptimal and pessimistic personal meaning of the profession from the point of view of its regulatory functions.

Sign in / Sign up

Export Citation Format

Share Document