scholarly journals Fractographic analysis of two fractured removable partial denture metal frameworks

2021 ◽  
Vol 10 (10) ◽  
pp. e08101018370
Author(s):  
Jussara da Silva Barbosa ◽  
Elisa Diniz de Lima ◽  
João Baptista Costa Agra de Melo ◽  
André Ulisses Dantas Batista ◽  
João Paulo Silva Neto ◽  
...  
Keyword(s):  
Casting Process ◽  
Energy Dispersive ◽  
Chemical Mapping ◽  
Removable Partial Denture ◽  
Partial Denture ◽  
X Ray ◽  
Material Fatigue ◽  
First Case ◽  
Metal Framework ◽  
Possible Cause

This study aimed to analyze two cases of fracture of the metal framework of Co-Cr-based removable partial dentures, using fractography to identify a true cause of these failures. The first case concerned the coupling between the smaller and larger connectors; the patient brought his fractured removable partial dentures to the clinic. The second case referred to a larger connector; structure of the patient fractured during the test.  For failure analysis, images of two fractured metal frameworks were taken by scanning electron microscopy to identify the origin of the fracture and to determine the mechanisms involved in the process. Subsequently, energy dispersive X-ray spectroscopy was used for elemental chemical mapping of the fracture interface. The fractography indicated material fatigue as a possible cause in the first case and an error in the casting process in the second. The energy dispersive X-ray spectroscopy test, performed in the specimen of case B, showed predominant and characteristic peaks for Co and Cr, with a higher concentration of chromium. The fractures identified were associated with inclusions and with material fatigue and a number important characteristics were evidenced by the technique.

Stress Study of Removable Partial Denture with Attachments Using Finite Element Analysis

2014 ◽  
Vol 658 ◽  
pp. 389-394
Author(s):  
Oana Cella Andrei ◽  
Livia Alice Tanasescu ◽  
Ruxandra Margarit ◽  
Mircea Horia Tierean
Keyword(s):  
3D Model ◽  
Sagittal Plane ◽  
Simulation Software ◽  
Von Mises Stress ◽  
Removable Partial Denture ◽  
Maximum Displacement ◽  
Partial Denture ◽  
Rotational Movement ◽  
Anterior Teeth ◽  
First Case

The paper presents the study of the stresses and the displacements that appear in different areas of the removable partial denture (RPD) with extracoronal attachments under occlusal loading, using FEA. The first step was to create the 3D model of a RPD with ball attachments in case of a class I Kennedy edentulous patient with all six anterior teeth as abutments. All materials were considered homogeneous, isotropic and having linear elasticity. There were assumed two types of constraints: in the first one the model is fixed under the action of the mastication forces; in the second one the rotational movement of the denture’s saddles in the sagittal plane was simulated, towards the edentulous ridge. In the first case, the 3D model and FEA were developed using Autodesk Inventor 2013 software. In the second case, the FEA was done using Autodesk Algor Simulation software. The loading of the model was symmetrically applied, considering the magnitude of the tangential and normal oral forces determined by Las Casas et al. These forces were applied to all the PM1, PM2, M1 and M2 pairs. Each loading case was analysed separately. The results of the two constrain situations are presented graphically, comparatively and show that the amount of the saddle displacement depends on the application area of the mastication force. Maximum displacement was computed at the application of the mastication forces on the M2 and decreases as the force is applied more mesial. The amount of the major connector’s deformation is very little influenced by the site of the force. The largest displacement of the denture was recorded at the distal end of the saddle, with values ​​that depend on the site of the forces. The existence of the rotational movement of the denture’s free end saddles in the sagittal plane, towards the edentulous ridge, changes the values ​​of accumulated stresses in denture during mastication and its Von Mises stress peaks. This analysis can be use to establish the principles of planning and designing the RPD with ball attachments having in mind to minimize the number of repairs caused by fractures of the components.

scholarly journals ANALYSIS ON THE PATTERN OF USING THE SERVICE OF REMOVABLE PARTIAL DENTURE MAKING IN A DENTAL LABORATORY IN SURABAYA

2017 ◽  
Vol 52 (4) ◽  
pp. 270
Author(s):  
Okti Setyowati ◽  
Endang Kusdarjanti
Keyword(s):  
Dental Health ◽  
Class Ii ◽  
Class I ◽  
Class Iii ◽  
Removable Partial Denture ◽  
Partial Denture ◽  
Metal Framework ◽  
Removable Denture ◽  
Class Iv

The making of removable denture is performed by a dental laboratory. To facilitate the identification, according to Kennedy classification, classes are divided onto groups, the Kennedy class I, II, III and IV. To suit with the needs of the dental laboratory tasks commonly done, priority are necessary for common cases and should to be taught to students of Dental Health Technology Diploma. In Surabaya, research of various cases of removable partial denture with the various Kennedy classifications has never been done before. This study was to analyze the pattern of service for the removable partial denture manufacture in dental laboratory at Surabaya (2011 – 2013). The research is an observatory analytic. The population is all dental laboratories located around the campus of the Faculty of Dentistry Airlangga University Surabaya. The sample was the whole population is willing to become respondents. Sampling by total sampling. The method of collecting data using secondary data from a dental laboratory in Surabaya from 2011 until 2013. The note is cases removable denture according to the classification of Kennedy that Kennedy Class I, II, III and IV. Also of note kinds of materials used to make the denture base that is heat cured acrylic resins, thermoplastic resins and metals coherent. The data is a compilation table charting the frequency until needed, then analyzed using cross tabulation. Mostly denture type is flexible type and the least is metal framework. Most cases by classification Kennedy is followed by class II class III and class II and more recently is the fourth. In conclusion, in 2011 and 2013 the manufacture of removable partial dentures according to the classification of Kennedy Class III is the most common in both the upper arch and lower jaw, followed by Class II, Class I and Class IV. In 2012 which is the highest grade III followed by class II, class IV and class I. The denture type most used is a flexible denture, followed acrylic denture and the last is the metal framework.

scholarly journals Removable partial denture metal framework manufactured by selective laser melting technology – A clinical report

2021 ◽  
Vol 62 (2) ◽  
Author(s):  
Joana Cabrita ◽  
◽  
Teresa Mendes ◽  
João Martins ◽  
Luís Lopes ◽  
...  
Keyword(s):  
Selective Laser Melting ◽  
Clinical Report ◽  
Laser Melting ◽  
Removable Partial Denture ◽  
Partial Denture ◽  
Melting Technology ◽  
Metal Framework ◽  
Classic Technique ◽  
Abutment Teeth ◽  
And Function

The selective laser melting technology is an additive digital method that permits producing metal frameworks for removable partial dentures. The existing literature has compared this technique with the classic technique in terms of precision, quality of fit, and function. This work describes a clinical case of a metal framework produced by the selective laser melting technique in a patient rehabilitated with a removable partial denture. No adjustments were required when the metal framework was inserted, showing good adaptation and stability to the abutment teeth and surrounding tissues. Further studies are necessary for a significant assessment of this technique’s clinical applicability.

scholarly journals Prosthodontic Rehabilitation of Patients with Double Crown and Locator Attachment - Retained Overdentures Supported by a Combination of Natural Tooth and Strategic Implants: Case Series

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Marko Milosavljevic ◽  
Milica Jovanovic ◽  
Dejan Zdravković ◽  
Jelena Todic ◽  
Jelena Eric
Keyword(s):  
Dental Implants ◽  
Case Series ◽  
Treatment Modalities ◽  
Prosthetic Rehabilitation ◽  
Removable Partial Denture ◽  
Partial Denture ◽  
First Case ◽  
Dental Office ◽  
Food And Drink ◽  
Edentulous Patients

Abstract Prosthetic rehabilitation of edentulous patients and patients with one or two own teeth can be established by different treatment modalities. The most commonly used in the treatment of these patients is conventional complete denture or removable partial denture. However, due to increasing problems with this type of therapy, such as insufficient retention, stability, comfort and pain during mastication, it is suggested an overdenture supported by two natural teeth or implants. We will present series of clinical reports. In two clinical cases patients came to the dental office because of the impossibility of wearing lower partial denture, and in one case patient had problems with the upper partial denture. After clinical examination and radigraphic analysis, in all patients, dental implants were implanted. In first case there were implanted two dental implants in the region 41 and 43, in second case it was region 33, and in third case implanatiton is performed in the region of 14, 11, 21. Prosthetic rehabilitation was done after 3-months bone oseointegration period. The treatment consisted in the production of double crowns and overdentures that are retained with locator attachment. This design of the denture significantly improves the quality of patient’s life (the dentures are stable, chewing is improved, the feeling of thermal sensations of food and drink is present, the feeling of taste is complete, and the psychological patient becomes safer).

scholarly journals Management of Kennedy Class I Partial Edentulism by Removable Cast Partial Denture: A Case Report

2013 ◽  
Vol 3 (2) ◽  
pp. 60
Author(s):  
NB Jamayet ◽  
U Habiba ◽  
SZE Zai ◽  
S Hossain
Keyword(s):  
Class I ◽  
Proper Function ◽  
Edentulous Patient ◽  
Removable Partial Denture ◽  
Partial Denture ◽  
Crown Root ◽  
Metal Framework ◽  
Abutment Teeth ◽  
Distal Extension ◽  
Lower Arch

Background: Distal extension edentulism can affect the patient’s ability to function as a dentate person. A well-made removable partial denture that has appropriate extensions, borders and ridge-to-dentition relationship will benefit the partially edentulous patient by providing increased comfort and improved dental function. This article described a patient who had a bilateral distal extension removable partial denture in both upper and lower arch. The prosthesis showed a successful rehabilitation with proper function and aesthetics. Methods: A Kennedy class I bilateral free end saddle edentulous arch in both upper and lower arch was rehabilitated with removable cast partial denture. The case had the reasonable amount of crown: root ratio for the remaining abutment teeth for placement of metal framework, occlusal rest and cast clasp. Results: The delivered denture showed proper sitting of occlusal rest and cast clasp. Retention and stability was acceptable. Occlusion had achieved its desired occlusion scheme. Conclusion: Removable cast partial denture is a suitable option for the rehabilitation of partially edentulous case if the case has such amount of abutment teeth remaining with healthy periodontal condition. DOI: http://dx.doi.org/10.3329/bjdre.v3i2.16616 Bangladesh Journal of Dental Research & Education Vol.3(2) 2013: 60

Atomic-resolution chemical mapping using energy-dispersive x-ray spectroscopy

2010 ◽  
Vol 81 (10) ◽  
Author(s):  
A. J. D’Alfonso ◽  
B. Freitag ◽  
D. Klenov ◽  
L. J. Allen
Keyword(s):  
Energy Dispersive ◽  
Atomic Resolution ◽  
Chemical Mapping ◽  
X Ray

scholarly journals Dimensional Changes in Co-Cr Alloys and Titanium Framework of Removable Partial Dentures Evaluation of the dimensions of the dental clasps

2020 ◽  
Vol 71 (5) ◽  
pp. 265-282
Author(s):  
Simina Gaman ◽  
Cristina Maria Bortun ◽  
Monica Scrieciu ◽  
Veronica Mercut ◽  
Roxana Maria Pascu ◽  
...  
Keyword(s):  
Clinical Situation ◽  
The Body ◽  
Missing Teeth ◽  
Removable Partial Denture ◽  
Partial Denture ◽  
Dimensional Changes ◽  
Stomatognathic System ◽  
Metal Framework ◽  
Significant Difference ◽  
Edentulous Patients

Removable partial denture are prosthetic solutions that replace missing teeth of partially edentulous patients, ensuring stomatognathic system functionality with affordable costs.The purpose of this study is to analyze the dimensional variations caused by the execution errors, which can lead to premature deterioration of the removable partial dentures and to conclude what sizes are deficient and can lead to the deterioration of the prosthetic part. The material involved in the present study was represented by the metal framework of 181 removable partial dentures. Of the total of 181 removable prosthetic parts, 88 were maxillary prostheses and 93 were mandibular prostheses. Measurements were made at the retentive arms, opposing arms, minor connectors, rests and junction areas between the body of the clasps and the active arms and studied compared to the edentulous classes. The results are focused on dimensional changes of both the retentive arms and the opposing arms of the clasps, which are roughly modeled in the first 3 edentulous classes, with a significant difference from those achieved in Kennedy`s 4th class edentulous, where these segments of the clasps are much shorter. Regarding the size of the rests, although their thickness approximates the values indicated in the literature, they do not fit into the occlusal relief of the tooth. The length of the retentive arms varies according to the classes of edentulous, the clinical situation, but also the size and type of the tooth (premolars, molars) on which the clasp is applied. Regarding the opposing arm, the observed differences cannot be correlated with the objective criteria of their achievement because the attention is directed towards the realization of the retentive arm.

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