A method for determining the natural moisture content of dentin in a clinical setting

2020 ◽  
Vol 1 (12) ◽  
pp. 36-39
Author(s):  
L. V. Iyashvili ◽  
Yu. A. Vinnichenko ◽  
A. V. Vinnichenko
Keyword(s):  
Composite Material ◽  
Moisture Content ◽  
Computer Program ◽  
Clinical Setting ◽  
Quantitative Assessment ◽  
Critical Mass ◽  
Filling Material ◽  
Adhesive Interaction ◽  
Natural Moisture Content ◽  
Hard Tissues

The purpose of the study is a quantitative assessment of the yield of dentinal fluid on the surface of the treated dentin of the tooth when restoring its structure with a composite filling material. To achieve this goal, digital images of the coronal parts of the teeth having formed carious cavities were used; virtual models of hard tissues of teeth recreated using specialized computer programs; A computer program that provides the ability to accurately determine the area of the treated dentin tooth. The results made it possible to draw the following conclusions: with an increase in the depth of the carious cavity, the amount of dentin fluid that can stand out on its surface (1–2 mm from the tooth cavity) sharply increases; with an increase in the area of the formed carious cavity (more than 30 mm2), the risk of release of a critical mass of dentinal fluid (more than 0.4 mg), which can adversely affect the strength of the adhesive interaction between the composite material and the hard tissues of the tooth, increases significantly; the same dynamics is observed with increasing time, at which there is the possibility of free exit of dentinal fluid to the surface of the cavity prepared for filling (more than 45 seconds).

scholarly journals Results of electrometric assessment of quality of marginal fit of composite material to hard tissues of teeth in various clinical conditions

2020 ◽  
pp. 25-28
Author(s):  
L. V. Iyashvili ◽  
Yu. A. Vinnichenko ◽  
O. G. Avraamova
Keyword(s):  
Composite Material ◽  
Filling Material ◽  
Adhesive Systems ◽  
Strict Adherence ◽  
Marginal Fit ◽  
Hard Tissues ◽  
Carious Process ◽  
Clinical Conditions ◽  
Over Time

The purpose of the study was a clinical electrometric assessment of the quality of the marginal fit of the composite material to the hard tissues of the tooth, depending on the type and amount of adhesive used the influence of the adhesive, namely: the mechanism of its action and quantity, on the quality of restoration of the hard tissues of the tooth lost by the carious process in the composite material over time.Material and methods. In clinical conditions, 140 fillings were examined, the placement of which was carried out only in cavities of classes 1 and 2, with the area affected by the carious process of hard tooth tissues from 30 to 50 mm2. For this, composite material ESTET X and adhesive systems were used: one-component XP BOND and self-etching XENO V in different volumes (6.6 and 17.7 mg). To assess the marginal fit of the filling material to the hard tissues of the tooth, the multifunctional electro-diagnostic device EST-DENT (Geosoft, Russia) was used. The principle of operation of the device is based on measuring the strength of the current flowing through the hard tissues of the tooth under the influence of a low-voltage source of electrical power. Results. The quality of the marginal fit of composite fillings to the hard tissues of the tooth, which is the main factor determining the durability of their functioning, largely depends on the amount of adhesive used, its mechanism of action, the area and depth of the carious lesion of dentin. Over time, there is a change in the structure obtained as a result of the mechanical and chemical interaction of the adhesive system and hard tissues of the tooth (primarily the hybrid layer), in the direction of decreasing its density and breaking integrity. This in turn increases the amount of electric current passing through it.Conclusions. An analysis of the obtained clinical data shows that when restoring hard tissues of teeth lost over large areas and located close to the pulp cavity of the coronal part of the tooth, it is necessary to take into account the effect of dentinal fluid on the quality and durability of the restoration. The use in these cases of adhesive systems in an amount of not less than 17.7 mg (a drop from dispenser), careful preparation of the affected tooth tissues, rational design of the formed cavity, strict adherence to the manufacturer’s recommendations on the time of use of the adhesive. can significantly reduce the risk of unsatisfactory treatment results.

Maximum Swelling of the Surface of the Composite Material

2021 ◽  
Vol 1031 ◽  
pp. 1-6
Author(s):  
D.I. Baidakov ◽  
L.Yu. Komarova ◽  
N.V. Baidakova
Keyword(s):  
Composite Material ◽  
Quantitative Assessment ◽  
Multilayer Material ◽  
Maximum Surface ◽  
Effect Of Solvents ◽  
Material Interaction

This article proposes a method for quantitative assessment of a multilayer material interaction with a solvent. It is proposed to assess the effect of solvents on the material by the value of its surface's maximum swelling. The advantage of this method is that the determined value of the outer layer's maximum surface swelling does not depend on the time of swelling and is least influenced by the properties of lower layers.

Natural Moisture-content, Porosity and Compaction of Clayey Deposits

Nature ◽  
1952 ◽  
Vol 170 (4317) ◽  
pp. 156-156
Author(s):  
P. G. H. BOSWELL
Keyword(s):  
Moisture Content ◽  
Natural Moisture Content

scholarly journals A Numerical Model for Torsion Analysis of Composite Ship Hulls

2012 ◽  
Vol 2012 ◽  
pp. 1-17 ◽  
Author(s):  
Ionel Chirica ◽  
Elena-Felicia Beznea
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Numerical Model ◽  
Computer Program ◽  
Ship Hull ◽  
Simplified Model ◽  
Container Ship ◽  
Elastic Analysis ◽  
Ship Hulls ◽  
Composite Ship

A new methodology based on a macroelement model proposed for torsional behaviour of the ship hull made of composite material is proposed in this paper. A computer program has been developed for the elastic analysis of linear torsion. The results are compared with the FEM-based licensed soft COSMOS/M results and measurements on the scale simplified model of a container ship, made of composite materials.

scholarly journals Laboratory studies of heated Bulk Fill composite in the tooth cavity during filling of teeth with carious defects

2021 ◽  
Vol 19 (4) ◽  
pp. 293-298
Author(s):  
V. A. Kriventseva ◽  
Y. B. Vorobieva ◽  
V. V. Nikitenko
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Room Temperature ◽  
Laboratory Studies ◽  
Marginal Fit ◽  
Military Medical Academy ◽  
Medical Academy ◽  
Hard Tissues ◽  
The Russian Federation ◽  
Materials Used

Aim. To study with the help of a microscope the marginal fit of Bulk-Fill group composite materials to the hard tissues of the tooth. Optimize the method of heating the composite in the cavity.Materials and methods. The marginal fit of the composite material of the Bulk-Fill group, sealed in 30 teeth of chewing anatomical and functional accessories extracted according to various indications, was studied. Materials used in the laboratory experiment: 3M ESPE Filtek posterior restorative Bulk Fill, SDR (Dentsply Sirona), Sonic Fill (Kerr). According to the manufacturers, the materials are used with the method of single-portion sealing. The research was conducted at the Department of General Dentistry of the S.M.Kirov Military Medical Academy of the Ministry of Defense of the Russian Federation.Results. 30 teeth extracted according to various indications of chewing anatomical and functional accessories were indicators were shown by the Sonic Fill (Kerr) system, due to heating and changing the viscosity of the material.Conclusions. It was proved in the laboratory that the heated composites of the Bulk-Fill group had the best edge fit during sealing than composites at normal room temperature. A nozzle was developed for heating the composite in the tooth cavity (priority application No. 2021120658 dated 12.07.2021). 

scholarly journals Behavior of Polypropylene Filled Cold Formed Steel Profiles – Part B: Torsion

2019 ◽  
Vol 1 (2) ◽  
pp. 7-11 ◽  
Author(s):  
Mahyar Maali
Keyword(s):  
Composite Material ◽  
Polymer Material ◽  
Waste Recycling ◽  
Steel Beams ◽  
Filling Material ◽  
Torsional Behavior ◽  
Cold Formed Steel ◽  
Thin Walled ◽  
Waste Polymer

Torsional behaviors of col- formed steel beams are investigated for the webs which are filled by polypropylene. Four I and U profile beams filled with polypropylene were manufactured and tested. In the study, two specimens U100 and two specimens I100 profiles with 1.5 m length and 1.20 mm thickness and thin-walled cold-formed steel profiles were used. The aim of this study is to investigate the torsional behavior of the composite material formed by pouring the polymer material into the U and I profile molds after homogenous pulping. A total of two groups of samples will be obtained: empty cold-formed steel profiles and waste polymer. In this study, finely ground waste and/or raw PP (polypropylene) was used as filling material. The polypropylene is not only improved the torsional behavior strikingly; but also give a way on environmental profit for waste recycling.

scholarly journals Orthopedic treatment with fixed dentures taking into account the distribution and causes of defects in dental hard tissues

Pathologia ◽  
2021 ◽  
Vol 18 (1) ◽  
pp. 112-116
Author(s):  
Yu. V. Klymiuk ◽  
Z. R. Ozhogan ◽  
L. V. Miziuk ◽  
V. M. Kryvanych ◽  
I. V. Yanishen
Keyword(s):  
Tooth Pulp ◽  
Filling Material ◽  
Orthopedic Treatment ◽  
Group I ◽  
Dental Hard Tissues ◽  
Hard Tissues ◽  
Metal Ceramic ◽  
Abutment Teeth ◽  
Ceramic Crowns ◽  
Group Ii

The aim of this work was to analyze the causes of complications of orthopedic treatment of dentition defects with metal-ceramic crowns and non-removable metal-ceramic bridges. Materials and methods. A total of 140 patients aged 34 to 49 years were examined during the work, who underwent the production of both single metal-ceramic crowns and non-removable metal-ceramic bridges. All patients were divided into 2 groups (70 patients each): the first one included patients with vital abutment teeth, the second one – with depulped. The abutment teeth had a different functional state – they were filled, had wedge-shaped defects or increased abrasion. Results. Orthopedic treatment showed that the manufacture of solid metal-ceramic crowns on dental teeth, which were filled more than 1 year ago, led to complications in 18 of 35 (51.4 %) patients in this group, which is insignificantly (P ˃ 0.05) by 17.2 % less than with similar prosthetics on depulped teeth. Regarding the manufacture of bridges, the trend of more complications in prosthetics on devital teeth persists, because in group I we had 20 (57.7 %) patients with complications, and in group II – 29 (82.9 %) cases, which is significantly different at the level of P < 0.05. In prosthetics of vital teeth, defects of hard tissues of which are replaced by filling material immediately before prosthetics, single crowns of complications occurred in 3 patients, i.e. in 8.6 %, which is insignificantly (P ˃ 0.05) less by 5.6 % than in group II where complications were found in 5 (14.2 %) people. Analysis of orthopedic treatment of patients with included defects of dentitions with metal-ceramic bridge prostheses revealed that when using filled teeth (filled for 1 year before prosthetics) in the case, when they were depulped, as abutment, complications were observed in 9 people, i.e. in 25.7 % of this group. This indicator insignificantly (P ˃ 0.05) exceeds the identical one from the first group (14.3 %) by 11.4 %, therefore, there is a tendency to reduce tooth resistance to negative external and internal factors, which has not acquired statistical significance. Conclusions. The study found that the frequency of complications that occur after prosthetics with fixed dentures depends on the condition of the tooth pulp, because the viable pulp provides metabolism, renewal of tooth cells and response to any damage. The need to replace fillings that were made more than 1 year ago to reduce the risk of secondary caries has been proven. Defects of hard tissues in the form of a wedge-shaped defect and the increased attrition do not increase frequency of complications in prosthetics by fixed dentures.

Geotechnical properties and behaviour of the Monasavu halloysite clay, Fiji

Clay Minerals ◽  
1986 ◽  
Vol 21 (3) ◽  
pp. 311-332 ◽  
Author(s):  
D. J. Knight
Keyword(s):  
Moisture Content ◽  
Three Dimensional ◽  
Climatic Conditions ◽  
Geotechnical Properties ◽  
Engineering Properties ◽  
Annual Rainfall ◽  
Natural State ◽  
Ground Pressure ◽  
Natural Moisture Content ◽  
High Rockfill Dam

AbstractGeotechnical properties and behaviour are described of the very wet, halloysitic, residual clay found in the dense rain forest at Monasavu, Viti Levu, Fiji, where the annual rainfall can exceed 5 m. The tropical climatic conditions have caused deep weathering of sandstones and produced a highly plastic clay with low density and a natural moisture content greatly in excess of the standard compaction optimum. This clay was found to contain halloysite which was ‘amorphous’ rather than crystalline. The material was used in this natural state in an 85-m high rockfill dam at Monasavu Falls as an unusually soft core, the construction of which involved unconventionally light compaction by low-ground-pressure-tracked dozers. Its resulting behaviour in terms of three-dimensional total and effective stresses, stress paths and deformations throughout the construction, impounding and full reservoir stages was closely monitored. This behaviour is examined in the light of the clay's classification, mineralogical, compaction and engineering properties determined before and during construction. Despite its unusual properties, it is concluded that the clay is a good engineering material, behaving like others containing halloysite in the more common tubular form, and, moreover, that the high natural moisture content is of positive benefit.

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