Effect of steel strengtheners on fracture resistance of the acrylic resin complete denture base

1985 ◽  
Vol 54 (1) ◽  
pp. 75-78 ◽  
Author(s):  
Anthony R. Ruffino
Keyword(s):  
Fracture Resistance ◽  
Acrylic Resin ◽  
Complete Denture ◽  
Denture Base

scholarly journals The Biomechanical Effect of Different Denture Base Materials on the Articular Disc in Complete Denture Wearers: A Finite Element Analysis

2015 ◽  
Vol 3 (3) ◽  
pp. 455-461
Author(s):  
Mohamed M. El-Zawahry ◽  
Ahmed A. El-Ragi ◽  
Mohamed I. El-Anwar ◽  
Eman Mostafa Ahmed Ibraheem
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Base Material ◽  
Acrylic Resin ◽  
Complete Denture ◽  
Articular Disc ◽  
Stress Strain ◽  
Element Analysis ◽  
Denture Base ◽  
Base Materials

AIM: The objective of the present study was to evaluate the effect of different denture base materials on the stress distribution in TMJ articular disc (AD) in complete denture wearers.MATERIAL AND METHODS: Two three dimensional Finite Element (FEA) models of an individual temporomandibular joint (TMJ) were built on the basis CT scan. The FEA model consisted of four parts: the condyle, the articular disc, the denture base, and the articular eminence skull. Acrylic resin and chrome-cobalt denture base materials were studied. Static loading of 300N was vertically applied to the central fossa of the mandibular second premolar. Stress and strain were calculated to characterize the stress/strain patterns in the disc.RESULTS: The maximum tensile stresses were observed in the anterior and posterior bands of (AD) on load application with the two denture base materials. The superior boundaries of the glenoid fossa showed lower stress than those on the inferior boundaries facing the condyle.CONCLUSIONS: Within the limitations of the present study it may be concluded that: The denture base material may a have an effect in stress-strain pattern in TMJ articular disc. The stiffer denture base material, the better the distribution of the load to the underling mandibular supporting structures & reducing stresses induced in the articular disc.

scholarly journals TESTING OF THE FRACTURE RESISTANCE OF THE HEAT-CURING DENTURE BASE ACRYLIC RESIN

2018 ◽  
Vol 9 (2) ◽  
Author(s):  
Aleksandra Maletin ◽  
Jovana Bastajić ◽  
Ivan Ristić ◽  
Branislava Petronijević Šarčev ◽  
Isidora Nešković ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Flexural Strength ◽  
Fracture Resistance ◽  
Acrylic Resin ◽  
Denture Base ◽  
Universal Testing ◽  
Heat Curing ◽  
Significant Difference ◽  
Student’S T ◽  
Student’S T Test

For many years, poly-methyl methacrylate has been used as a material of choice for making the denture base, thanks to its good and desirable performances, such as: simplicity in work, possibility of reparation, aesthetics and affordable price. Considering to its insufficient hardness and fracture resistance, there is a tendency to improve the mechanical properties of the material, by changing its basic composition. The aim of the research was to determine the fracture resistance of the heat-curing denture base acrylic resin materials. Materials and methods: For the research ,20 samples of the 2 heat-curing acrylics had been prepared, standard ones and reinforced acrylic resin material. After the storage in the saline for 15 days, measurements of the fracture resistance were performed by using the universal testing device. The data were statistically processed using the Student’s t-test for independent samples. Results: By measuring the flexural strength and deflection at breakage, it has been proven that there was, statistically, a significant difference of the flexural strength between reinforced (179.91-248.72MPa) and standard heat-curing acrylics (183.25- 200.74MPa). The deflection at breakage showed approximately the same values for both materials (1,0-1,4mm; 1.0-1.5mm). Conclusion: By enhancing the polymer, the mechanical properties of the denture base acrylic resin materials will be improved, primarily, higher fracture resistance, that means that these technologies need to be improved.

Complete denture retention. Part II: Wettability studies on various acrylic resin denture base materials

1989 ◽  
Vol 62 (3) ◽  
pp. 308-312 ◽  
Author(s):  
Ph. Monse´ne´go ◽  
A. Baszkin ◽  
M. de Lourdes Costa ◽  
J. Lejoyeux
Keyword(s):  
Acrylic Resin ◽  
Complete Denture ◽  
Denture Base ◽  
Base Materials

scholarly journals Technique for Rebasing and Tooth Replacement of the Implant Retained Fixed Complete Denture Incorporating an Existing Metal Framework

2013 ◽  
Vol 2 (2) ◽  
pp. 215
Author(s):  
E. A. Nahlah ◽  
P. S. Baker ◽  
D. S. Pannu ◽  
J. Londono
Keyword(s):  
Base Material ◽  
Acrylic Resin ◽  
Complete Denture ◽  
Vertical Dimension ◽  
Tooth Replacement ◽  
Denture Base ◽  
Impression Technique ◽  
Metal Framework

This article describes a simplified impression technique for replacement of acrylic resin denture base material and teeth for an implant retained fixed complete denture utilizing the existing metal framework. This method permits precise alignment of the impression and framework to implants and residual ridges, and simultaneously provides a cast and record for articulation of replacement teeth at the appropriate vertical dimension of occlusion.

scholarly journals Prosthodontic Management of Single Complete Denture with Reinforced Metal Denture Base: A Case Report

2019 ◽  
Vol 07 (01) ◽  
pp. 042-045
Author(s):  
Chhavi Sharma ◽  
Manjit Kumar ◽  
Ajay Bansal ◽  
Sanjan Verma ◽  
Shak Mehta
Keyword(s):  
Case Report ◽  
Methyl Methacrylate ◽  
Physical Properties ◽  
Dimensional Stability ◽  
Fracture Resistance ◽  
Base Material ◽  
Complete Denture ◽  
Denture Base ◽  
Major Factors ◽  
Maxillary Arch

AbstractFor improvement in longevity of complete denture prosthesis in place of conventional poly methyl methacrylate denture base material, metal denture base is used to rehabilitate complete edentulous maxillary arch as it helps in preventing resorption of residual ridges and improves fracture resistance, better dimensional stability, more accuracy, less weight, and better retention of prosthesis. For better prognosis there are many factors, but major factors such as retention, stability, and support are more important. Metal denture base leads to improvement in physical properties of the prosthesis.

scholarly journals Effects of Denture Base Thicknesses and Reinforcement on Fracture Strength in Mandibular Implant Overdenture with Bar Attachment: Under Various Acrylic Resin Types

2019 ◽  
Vol 13 (01) ◽  
pp. 064-068
Author(s):  
Selen Tokgoz ◽  
Arda Ozdiler ◽  
Burc Gencel ◽  
Ergun Bozdag ◽  
Gulbahar Isık-Ozkol
Keyword(s):  
Fracture Strength ◽  
Fracture Resistance ◽  
Glass Fibers ◽  
Testing Machine ◽  
Acrylic Resin ◽  
Base Thickness ◽  
Denture Base ◽  
Significant Difference ◽  
Implant Overdenture ◽  
Student’S T

Abstract Objective This study aimed to assess the effect of reinforcement, denture base thickness, and acrylic resin types on dynamic and static fracture strength in mandibular implant overdentures with bar attachment. Materials and Methods One hundred and eight experimental mandibular implant overdentures with bar attachments were fabricated in three main groups, namely unreinforced (control: C), reinforced with unidirectional glass fibers (FR), and Co–Cr cast metal (MR). Each group included denture bases of 2-, 3-, and 4-mm thicknesses and produced with conventional (CA) and high-impact acrylic (HIA) resins. Specimens were thermocycled (5,000 times, 5–55°C) then subjected to a 400,000 cyclic load regime. Unbroken specimens were then loaded until fracture by a universal testing machine. Differences in mean fracture resistance among the groups were compared using the one-way analysis of variance (with post hoc Tukey's honestly significant difference test) and Student's t-tests (α = 0.05). Results Fracture strength increased significantly when the denture base thickness was increased (p = 0.001). The 2-mm denture base thickness was not enough for reinforcement. The fracture strength of the FR groups was significantly higher than other groups for 3- and 4-mm thicknesses (p = 0.001). The fracture strength of the HIA resin was significantly higher than CA resin in FR groups (p = 0.029 and p = 0.001). MR groups showed the weakest fracture strength. Conclusions The 2-mm denture base thickness had sufficient fracture strength without reinforcement and a positive relationship between acrylic resin thickness and fracture resistance was found.

scholarly journals The Influence of Saliva pH on the Fracture Resistance of Three Complete Denture Base Acrylic Resins

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Juliana de Sá ◽  
Francisca Vieira ◽  
Carlos Manuel Aroso ◽  
Mónica Cardoso ◽  
José Manuel Mendes ◽  
...  
Keyword(s):  
Fracture Resistance ◽  
Artificial Saliva ◽  
Testing Machine ◽  
Acrylic Resin ◽  
Low Ph ◽  
Data Sets ◽  
Denture Base ◽  
Base Materials ◽  
Acrylic Resins ◽  
Ph Conditions

Aim and Background. The absorption of fluids by denture base materials diminishes the mechanical properties such as hardness, strength, and fatigue limit due to the plasticizing effect of water. This study aimed to evaluate the influence of oral pH on the fracture resistance of prosthetic bases made of three different heat-polymerizable acrylic resin brands: RS Vertex®, Triplex Hot®, and Megacryl®. The strength needed to fracture the resins and the resistance to fracture each resin were evaluated. Methods. Ten prosthesis bases prepared with each brand of resin were subjected to neutral and low pH conditions (pH 7 and pH 4) by submerging them in artificial saliva for 30 days. After exposure, the fatigue resistance of the resins was tested using a Dental CS® Testing Machine. Statistical Analysis Test. The data sets were described quantitatively in terms of mean (M) and standard deviation (SD). Shapiro–Wilk tests and unilateral analysis of variance (ANOVA) were performed and complemented by Tukey’s multiple comparison tests. The effect size (η2), whose cohort points followed Cohen’s recommendations: 0.01 (low), 0.06 (medium), and 0.14 (high), was calculated. The results were considered significant if p < 0.05 and marginally significant if p < 0.10 . Results. One-way ANOVA showed that Megacryl® had the highest fracture resistance at pH 7 (52.23 Kgf), compared with Triplex Hot® ( p < 0.001 ) and RS Vertex® ( p = 0.034 ). Two-way ANOVA confirmed the interaction between brand and pH ( p = 0.022 ), also revealing that brands comparison is significant or marginally significant, when pH is not considered (Megacryl® versus Triplex Hot®, p < 0.001 , and RS Vertex®, p = 0.058 ; Triplex Hot® versus RS Vertex®, p = 0.051 ), and pH 7 results were significantly higher ( p = 0.003 ), even when brands are not considered. Hence, Megacryl® at pH 7 was found to have the highest fracture resistance, detached from other brands and pH values. Conclusion. It can be concluded within the limitations of this study that there are differences in the fracture resistance among the three brands of acrylic resin. Megacryl® was found to have the highest fracture resistance, and Triplex Hot® was the lowest. The results also show that exposure to a low pH environment decreases the fracture resistance of the Megacryl® and RS Vertex® resins.

scholarly journals Design of complete denture reinforced with metal base

2013 ◽  
Vol 60 (1) ◽  
pp. 15-23 ◽  
Author(s):  
Srdjan Postic
Keyword(s):  
Neuromuscular Disorders ◽  
Acrylic Resin ◽  
Complete Denture ◽  
Complete Dentures ◽  
Denture Base ◽  
Metal Base ◽  
Metal Framework ◽  
Metal Frame ◽  
Edentulous Patients ◽  
Artificial Teeth

Introduction. Complete denture reinforced with metal bases is fabricated in cases of fracture risk as well as in selected patients with neuromuscular disorders. The aim of this report was to present different designs of metal framework for complete denture and their advantages in the treatment of edentulous patients. Material and Methods. The study included 116 edentulous patients who received complete dentures. The respondents were divided into two groups according to the type of denture used. Thirty one patients were rehabilitated with complete dentures reinforced with metal base, whereas 85 patients received conventional complete acrylic dentures. Metal bases were fabricated using Co-Cr-Mo alloy. Two designs different in regards to the vibrating line were fabricated: metal frame extended to the vibrating line and acrylic resin extended to the vibrating line. After investing and casting, metal bases were electropolished. Subsequent processes of arranging artificial teeth, waxing, flasking and finishing completed the fabrication process of dentures. Results. Denture base fractures were prevented in majority of patients. The design of upper denture where metal frame was extended to the vibrating line and metal base with elongation over the convex edentulous ridge in lower jaw were the most favored and successful in prosthetic rehabilitation of experimental group of edentulous patients. There was no need for rebasing of complete dentures reinforced with metal base. Conclusion. Complete denture reinforced with metal base presents a favorable design for rehabilitation of edentulous patients with well pronounced edentulous ridges and low tendency to resorption.

scholarly journals Total CAD/CAM Supported Method for Manufacturing Removable Complete Dentures

2016 ◽  
Vol 2016 ◽  
pp. 1-5 ◽  
Author(s):  
Arthur Furtado de Mendonça ◽  
Mario Furtado de Mendonça ◽  
George Shelby White ◽  
Georges Sara ◽  
Darren Littlefair
Keyword(s):  
Computer Aided Design ◽  
Acrylic Resin ◽  
Clinical Situation ◽  
Complete Denture ◽  
Denture Base ◽  
Denture Teeth ◽  
Computer Aided ◽  
Cad Cam ◽  
The Individual ◽  
Aided Design

The incorporation of computer-aided design/computer-aided manufacturing (CAD/CAM) technology into complete denture fabrication brings about several advantages to the fabrication process, providing better predictability of the desired outcomes and high accuracy of denture fit, mainly because the milling of prepolymerized acrylic resin eliminates the shrinkage of the acrylic base. Also, there is a decrease in the porosity when compared to a conventionally processed denture, and consequently there is a decrease in the retention of Candida albicans on the denture base. The presented workflow for complete denture fabrication presents a totally wax-free manufacturing process, combining rapid prototyping (RP) and rapid milling. With the presented technique, the maxillomandibular relation (MMR) and the ideal setup of the tooth arrangement are developed by using occlusion rims and trial setup made with RP. For the definitive final denture, the denture base and the basal surfaces of the conventional denture teeth were milled according to the individual clinical situation. Posteriorly, the teeth were adapted and bonded into the milled sockets of the milled base.

Comparative study of some properties of flexible and conventional heat cured acrylic resin denture base material

2018 ◽  
Vol 21 (1) ◽  
pp. 87-91
Author(s):  
Wesam E Badr ◽  
Hassan M Sakr ◽  
Muhammad A Masoud ◽  
Mohamed A Quassem
Keyword(s):  
Comparative Study ◽  
Base Material ◽  
Acrylic Resin ◽  
Denture Base
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