scholarly journals Adhesive photocomposite prosthese – option of restoration of dental row defect in the frontal area (clinical case report)

2021 ◽  
Vol 106 (2) ◽  
pp. 20-26
Author(s):  
I. Mochalov ◽  
◽  
O. Golinka ◽  
Keyword(s):  
Anterior Part ◽  
Physical And Mechanical Properties ◽  
Frontal Area ◽  
Posterior Teeth ◽  
Bridge Structures ◽  
Removable Plate ◽  
Abutment Teeth ◽  
Preliminary Preparation ◽  
Large Groups ◽  
Key Words Teeth

Summary. Having and maintaining a smile aesthetic is an essential component of modern popular culture. Adhesive bridges («Maryland bridge») have been developed to eliminate single included defects in the dentition in the frontal areas, without preparing the supporting teeth. In modern conditions this technology is the method of choice since single defects in the anterior part of the dentition can also be eliminated through orthodontic treatment, manufacturing of a partially removable plate prosthesis, a traditional dental bridges, the manufacturing of cantilever orthopedic structures and prosthetics based on a dental implant. Adhesive dentures are a relatively new dental technology (which is on the border of orthopedic and therapeutic dentistry) the first work in this direction was carried out in the early 80s of the twentieth century. Modern adhesive bridges are divided into two large groups – solid metal and photopolymer (composite) which prevail in practice. The optimal form of the release of the reinforcing element which combines a slight preparation of abutment teeth to a safe depth, high physical and mechanical properties, simple achievement of the anatomical shape of the teeth in the bridge structures of the anterior and posterior teeth is fiberglass in the form of ribbons 2 mm wide, up to 0.5 mm (this is the most effective width and thickness for clinical practice) and braided type. Using adhesive bridges, it is possible to optimally restore the aesthetics of the anterior part of the dentition in one visit without preliminary preparation of adjacent teeth. An example of the manufacture of a photocomposite adhesive prosthesis reinforced with glass fiber for the restoration of a single included defect in the dentition in the frontal area using domestically produced materials is given. Key words: teeth, defect, composite, adhesion, fiberglass.

ANALYSIS OF WORK ON NANOSTRUCTURED MATERIALS IN ORTHOPEDIC DENTISTRY UNDER THE DIRECTION OF PROFESSOR E.S. KALIVRADZHIYAN

2020 ◽  
pp. 8-13
Author(s):  
Жанна Владимировна Вечеркина ◽  
Наталия Владимировна Чиркова ◽  
Михаил Анатольевич Крючков ◽  
Виктор Сергеевич Калиниченко
Keyword(s):  
Nanostructured Materials ◽  
Dental Materials ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Barrier Properties ◽  
Working Time ◽  
Polymerization Process ◽  
High Tech ◽  
Acrylic Polymer ◽  
Removable Plate

Развитие технологий, основанных на использовании низкотоксичных материалов, позволит в скором будущем начать их применение в медицине. Применение наночастиц серебра, меди, кремния, цинка, титана, кобальта в качестве модифицирующей добавки позволит оказать активное влияние на структуру исходных материалов и изменение их свойств, а именно улучшение физико-механических, физико-химических и токсико-гигиенических свойств материалов. Наноразмерные частицы кремния, введенные в фиксирующие стоматологические материалы, приводят к улучшению физико-химических, физико-механических свойств кристаллизующихся материалов, а малая теплопроводность кремния может увеличить его рабочее время и снизить выделение тепла при реакции кристаллизации. Так как от этих характеристик зависит объем манипуляций, при фиксации ортопедических конструкций на опорных зубах целесообразно было бы привести рабочее время твердения к чистому времени твердения, что позволит увеличить объем манипуляций приготовленной массой без ухудшения ее свойств. Разработка высокопрочных, биосовместимых, высокотехнологичных нанопластмасс для базисов съемных пластиночных протезов является актуальной проблемой повышения качества жизни пациентов. Модификация наноразмерными частицами серебра, кремния акрилового полимера позволит улучшить такие физико-механические свойства, как ударную вязкость, прочность, температуростойкость, барьерные свойства, уменьшить усадку полимера на этапе полимеризации, в отличие от уже известных отечественных и дорогостоящих импортных полимеров. Наноразмерные частицы кремния, серебра являются сокатализаторами метилметакрилата, влияющими на уменьшение количества остаточного мономера после процесса полимеризации, тем самым повышая санитарно-химические и токсико-гигиенические характеристики полимера. Все вышеизложенное позволило сформулировать цель исследований по наноструктурированным материалам под руководством профессора …посвящается памяти профессора, д.м.н. Каливраджияна Э.С. The development of technologies based on the use of low-toxic materials will make it possible to begin their application in medicine in the near future. The use of nanoparticles of silver, copper, silicon, zinc, titanium, cobalt as a modifying additive will make it possible to actively influence the structure of the starting materials and change their properties, namely, improve the physicomechanical, physicochemical and toxicohygienic properties of materials. Nanosized silicon particles introduced into fixing dental materials lead to an improvement in the physicochemical, physicomechanical properties of crystallizing materials, and the low thermal conductivity of silicon can increase its working time and reduce heat generation during the crystallization reaction. Since the volume of manipulations depends on these characteristics, when fixing orthopedic structures on abutment teeth, it would be advisable to bring the working time of hardening to a pure hardening time, which will increase the volume of manipulations with the prepared mass without deteriorating its properties. The development of high-strength, biocompatible, high-tech nanoplastics for the bases of removable plate prostheses is an urgent problem to improve the quality of life of patients. Modification of acrylic polymer with nano-sized particles of silver and silicon will improve such physical and mechanical properties as impact strength, strength, temperature resistance, barrier properties, and reduce polymer shrinkage at the stage of polymerization, in contrast to the already known domestic and expensive imported polymers. Nanosized particles of silicon, silver are cocatalysts of methyl methacrylate, affecting the reduction of the amount of residual monomer after the polymerization process, thereby increasing the sanitary-chemical and toxic-hygienic characteristics of the polymer. All of the above made it possible to formulate the goal of research on nanostructured materials under the guidance of the professor …dedicated to the memory of the professor, d.m.s. Kalivrajiyan E.S.

The Influence of Food Consistency on the Abutment Teeth in Fixed Prostheses A FEA study

2018 ◽  
Vol 69 (2) ◽  
pp. 407-409
Author(s):  
Monica Tatarciuc ◽  
Anca Vitalariu ◽  
Odette Luca ◽  
Andra Aungurencei ◽  
Ovidiu Aungurencei ◽  
...  
Keyword(s):  
Computer Aided Design ◽  
Elasticity Modulus ◽  
Finite Elements Analysis ◽  
Posterior Teeth ◽  
Cad System ◽  
Food Consistency ◽  
Computer Aided ◽  
Influence Of Food ◽  
Abutment Teeth ◽  
Aided Design

The aim of our study was to evaluate through Finite Elements Analysis (FEA), the stress induced into the abutments and into a metallic bridge by an alimentary bolus of different consistency. Research was carried using the FEA on a model of the bridge with full crowns as retainers in the posterior teeth (34-36), obtained using a contact scanner and computer aided design (CAD) system. We surveyed the stress induced by different food consistency with elasticity modulus between 0 MPa and 60000 MPa. A 6MPa stress was induced by the bridge when the elasticity modulus was equal to 200 MPa. For the maximal value of the elasticity modulus, the stress was 13.68Mpa. The highest values of stresses are registered for the maximal values of the elasticity modulus.

scholarly journals Influence of Preparation Design, Marginal Gingiva Location, and Tooth Morphology on the Accuracy of Digital Impressions for Full-Crown Restorations: An In Vitro Investigation

2020 ◽  
Vol 9 (12) ◽  
pp. 3984
Author(s):  
Selina A. Bernauer ◽  
Johannes Müller ◽  
Nicola U. Zitzmann ◽  
Tim Joda
Keyword(s):  
In Vitro Study ◽  
Arch Model ◽  
Finish Line ◽  
Posterior Teeth ◽  
Mean Values ◽  
Digital Impressions ◽  
In Vitro Investigation ◽  
Abutment Teeth ◽  
3D Printed

(1) Background: Intraoral optical scanning (IOS) has gained increased importance in prosthodontics. The aim of this in vitro study was to analyze the IOS accuracy for treatment with full crowns, considering possible influencing factors. (2) Methods: Two tooth morphologies, each with four different finish-line designs for tooth preparation and epi- or supragingival locations, were digitally designed, 3D-printed, and post-processed for 16 sample abutment teeth. Specimens were digitized using a laboratory scanner to generate reference STLs (Standard Tessellation Language), and were secondary-scanned with two IOS systems five times each in a complete-arch model scenario (Trios 3 Pod, Primescan AC). For accuracy, a best-fit algorithm (Final Surface) was used to analyze deviations of the abutment teeth based on 160 IOS-STLs compared to the reference STLs (16 preparations × 2 IOS-systems × 5 scans per tooth). (3) Results: Analysis revealed homogenous findings with high accuracy for intra- and inter-group comparisons for both IOS systems, with mean values of 80% quantiles from 20 ± 2 μm to 50 ± 5 μm. Supragingival finishing lines demonstrated significantly higher accuracy than epigingival margins when comparing each preparation (p < 0.05), whereas tangential preparations exhibited similar results independent of the gingival location. Morphology of anterior versus posterior teeth showed slightly better results in favor of molars in combination with shoulder preparations only. (4) Conclusion: The clinical challenge for the treatment with full crowns following digital impressions is the location of the prospective restoration margin related to the distance to the gingiva. However, the overall accuracy for all abutment teeth was very high; thus, the factors tested are unlikely to have a strong clinical impact.

scholarly journals REPLACEMENT OF POSTERIOR MISSING TEETH WITH PORCELAIN FUSED TO METAL (PFM) BRIDGE

2019 ◽  
Vol 1 (2) ◽  
pp. 159-164
Author(s):  
Eni Rahmi
Keyword(s):  
Case Report ◽  
Spatial Analysis ◽  
Chief Complaint ◽  
Missing Teeth ◽  
Posterior Teeth ◽  
Clinical Procedures ◽  
All Ceramic ◽  
Analysis Calculation ◽  
Abutment Teeth ◽  
The Aesthetic

Porcelain fused to metal (PFM) bridge is the most of treatment that commonly used as a fixed partial dentures. One of the indication for PFM bridge is to replacing the loss of posterior teeth. This case report discussed about the treatment of posterior missing teeth with PFM bridge. Objective: to explain the clinical procedures of PFM bridges to treat the patient with posterior missing teeth. Case report: A 29-years old woman came to prosthodontic clinic in Faculty of Dentistry University of Padjadjaran with chief complaint of right maxillary posterior missing teeth. The treatment planning that have been choosen for this case was the porcelain fused to metal bridge due this excellent characteristic of resistence to mastication force compared with other types of bridge such as all ceramic or all acrylic bridge. Beside that, the aesthetic achievement of this kind of bridges is more excellent than all metal bridges. Disscussion: A spatial analysis, calculation the number of abutment against which used, and selected design bridge very determine the success of this treatment. In addition to that, the clinical procedures consisting of abutment teeth preparation, an accurate impression, and appropriate cementation were needed to get the satisfactory result. Conclusions: The porcelain fused to metal bridge is a appropriate option for posterior missing teeth treatment that fullfil satisfactorical biomechanical and esthetic factors.

scholarly journals Gigitiruan jembatan adesif sebagai perawatan alternatif pada kasus kehilangan satu gigi Adhesive bridge as alternative treatment to replace one missing teeth

2012 ◽  
Vol 11 (2) ◽  
pp. 105
Author(s):  
Christie Rizki ◽  
Deddy Firman ◽  
Aprillia Adenan
Keyword(s):  
Case Report ◽  
Missing Teeth ◽  
Posterior Teeth ◽  
Partial Denture ◽  
Fixed Partial Denture ◽  
Metal Framework ◽  
Acid Etch ◽  
Abutment Teeth ◽  
Adhesive Cement ◽  
Missing Tooth

Adhesive bridge is a fixed partial denture that consisted of pontic and cast metal framework retainer that cementedto abutment teeth by means of adhesive cement, used acid etch technique. Adhesive bridge can be used to replaceone or two anterior or posterior teeth. This case report focused on the making of adhesive bridge in anterior andposterior single missing tooth. By minimal preparation and unanesthesied teeth, patient satisfaction could beachieved. Treatment should be done as patient needed with the adequate clinical technique and specific materialmanipulation.

Comparison of the Convergence Angle in Full-crown Abutment Teeth prepared by the Preclinical and Senior Students in Faculty of Dentistry, Tabriz University of Medical Sciences, Islamic Republic of Iran

2017 ◽  
Vol 8 (2) ◽  
pp. 77-80
Author(s):  
Shima Ghasemi ◽  
Payam Mireskandari ◽  
Tahereh Ghaffari ◽  
Amir R Babaloo
Keyword(s):  
Dental Students ◽  
Islamic Republic ◽  
Medical Sciences ◽  
Posterior Teeth ◽  
Convergence Angle ◽  
Anterior Teeth ◽  
Fixed Prosthodontics ◽  
Islamic Republic Of Iran ◽  
Abutment Teeth ◽  
Senior Students

ABSTRACT Introduction One of the main factors in the successful treatment of fixed prosthodontics is preparation of the teeth such that proper retention of the crown is provided. The aim of the study was to compare the convergence angle in full-crown abutment teeth prepared by the preclinic and senior students in the Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Islamic Republic of Iran. Materials and methods A cross-sectional/analytical study was conducted on dental students in the Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Islamic Republic of Iran in 2016. The sample size was determined randomly at n = 30 for each group. Preparation angle for each specimen was measured and recorded by digital photographs and Autocad software. The results were analyzed with appropriate statistical tests. Results The results showed that preclinic and senior students prepared the anterior teeth with average values of 22.13 ± 9.59 to 18.53 ± 8.87° and 18.46 ± 11.08 to 14.6 ± 6.32° respectively, from the buccolingual and mesiodistal aspects. Concerning posterior teeth, preclinic and senior students prepared them with average values of 21.4 ± 10.24 to 22.46 ± 8.99° and 19.46 ± 8.09 to 21.13 ± 8.83° respectively. Although the average value of convergence angle in both aspects was higher for preclinic students than for the senior students, t-test for independent groups revealed no significant differences (p > 0.05). Conclusion Either preclinic or senior students prepared the teeth with a convergence angle, i.e., higher than ideal. However, all the recorded angles were within the range of previous studies. How to cite this article Ghasemi S, Mireskandari P, Ghanizadeh M, Ghaffari T, Babaloo AR. Comparison of the Convergence Angle in Full-crown Abutment Teeth prepared by the Preclinical and Senior Students in Faculty of Dentistry, Tabriz University of Medical Sciences, Islamic Republic of Iran. World J Dent 2017;8(2):77-80.

Metallurgical Effects of Grain Boundary Ledges

1977 ◽  
Vol 35 ◽  
pp. 126-129
Author(s):  
L.E. Murr
Keyword(s):  
Grain Boundary ◽  
Quantitative Data ◽  
Mechanical Treatment ◽  
Unit Length ◽  
Physical And Mechanical Properties ◽  
Direct Observations ◽  
Transmission Electron ◽  
Properties Of Materials ◽  
Thermo Mechanical Treatment ◽  
Ledge Density

Ledges in grain boundaries can be identified by their characteristic contrast features (straight, black-white lines) distinct from those of lattice dislocations, for example1,2 [see Fig. 1(a) and (b)]. Simple contrast rules as pointed out by Murr and Venkatesh2, can be established so that ledges may be recognized with come confidence, and the number of ledges per unit length of grain boundary (referred to as the ledge density, m) measured by direct observations in the transmission electron microscope. Such measurements can then give rise to quantitative data which can be used to provide evidence for the influence of ledges on the physical and mechanical properties of materials.It has been shown that ledge density can be systematically altered in some metals by thermo-mechanical treatment3,4.

Interface structures in polycrystalline ceramic materials

1986 ◽  
Vol 44 ◽  
pp. 468-471
Author(s):  
K. J. Morrissey
Keyword(s):  
Electron Microscopy ◽  
Analytical Electron Microscopy ◽  
Physical And Mechanical Properties ◽  
High Resolution Electron Microscopy ◽  
Ceramic Materials ◽  
Polycrystalline Materials ◽  
Transmission Electron ◽  
Resolution Electron ◽  
Interface Structures

Grain boundaries and interfaces play an important role in determining both physical and mechanical properties of polycrystalline materials. To understand how the structure of interfaces can be controlled to optimize properties, it is necessary to understand and be able to predict their crystal chemistry. Transmission electron microscopy (TEM), analytical electron microscopy (AEM,), and high resolution electron microscopy (HREM) are essential tools for the characterization of the different types of interfaces which exist in ceramic systems. The purpose of this paper is to illustrate some specific areas in which understanding interface structure is important. Interfaces in sintered bodies, materials produced through phase transformation and electronic packaging are discussed.

Fine structure of the rectal papillae of the oriental fruuit fly, Dacus dorsalis Hendel (Tephritidae, Diptera Insecta)

1990 ◽  
Vol 48 (3) ◽  
pp. 498-499
Author(s):  
Len Wen-Yung ◽  
Mei-Jung Lin
Keyword(s):  
Fine Structure ◽  
Cell Membrane ◽  
Intercellular Space ◽  
Anterior Part ◽  
Apical Cell ◽  
Posterior Part ◽  
Apical Cell Membrane ◽  
Dacus Dorsalis ◽  
Radial Cell ◽  
Circular Base

Four cone-shaped rectal papillae locate at the anterior part of the rectum in Dacus dorsalis fly. The circular base of the papilla protrudes into the haemolymph (Fig. 1,2) and the rest cone-shaped tip (Fig. 2) inserts in the rectal lumen. The base is surrounded with the cuticle (Fig. 5). The internal structure of the rectal papilla (Fig. 3) comprises of the cortex with the columnar epithelial cells and a rod-shaped medulla. Between them, there is the infundibular space and many trabeculae connect each other. Several tracheae insert into the papilla through the top of the medulla, then run into the cortical epithelium and locate in the intercellular space. The intercellular sinuses distribute in the posterior part of the rectal papilla.The cortex of the base divides into about thirty segments. Between segments there is a radial cell (Fig. 4). Under the cuticle, the apical cell membrane of the cortical epithelium is folded into a regular border of leaflets (Fig. 5).

Sign in / Sign up

Export Citation Format

Share Document