scholarly journals The Effect of Fiber Reinforcement on the Dimensional Changes of Poly Methyl Methacrylate Resin after Processing and after Immersion in Water: An in vitro Study

2011 ◽  
Vol 12 (4) ◽  
pp. 305-317 ◽  
Author(s):  
Sathish Abraham ◽  
LM Ranganath ◽  
Ravindra Ganguly Keshav Shet ◽  
AG Rajesh
Keyword(s):  
Methyl Methacrylate ◽  
Fiber Reinforcement ◽  
In Vitro Study ◽  
Acrylic Resin ◽  
High Impact ◽  
Vitro Study ◽  
Poly Methyl Methacrylate ◽  
Dimensional Changes ◽  
Heat Cure

ABSTRACT Aims and objectives To evaluate and compare the effect of fiber reinforcement on the dimensional changes of heat-cured poly (methyl methacrylate) resin after processing and immersion in water. Materials and methods Three different heat-cure resins were selected for the present study: (1) Nonreinforced heat-cure methyl methacrylate resin, (2) High Impact heat-cured methyl methacrylate resin and (3) Fiberglass reinforced methyl methacrylate resin. Ninety samples were prepared using three different resins and denture bases obtained for the same. The amount of space between the tissue surface and the cast in the anterior, middle and posterior regions is measured after processing and immersion in water for 17 days using a traveling microscope having a least count of 0.001 cm. Results Mean and standard deviation were calculated for the dimensional changes and were subjected to statistical analysis (Student t-test, unpaired). Among the three groups of resins, fiber reinforced heat-cured methyl methacrylate resin was found to be statistically highly significant in terms of dimensional changes when compared with the nonreinforced and high impact heat-cured resins. Conclusion Dimensional changes were evident in all the planes in the three groups studied and were in the following decreasing order—fiberglass reinforced heat-cured poly (methyl methacrylate) resin, high impact heat-cured poly (methyl methacrylate) resin and nonreinforced heat-cured poly (methyl methacrylate) resin. Clinical significance The fibers are added in order to increase the strength of acrylic resin. Considering only the strength may in turn affect the dimensional accuracy of the acrylic resin resulting in loss of retention and stability, affecting the fit of the denture. How to cite this article Ranganath LM, Shet RGK, AG Rajesh, Abraham S. The Effect of Fiber Reinforcement on the Dimensional Changes of Poly Methyl Methacrylate Resin after Processing and after Immersion in Water: An in vitro Study. J Contemp Dent Pract 2011;12(4):305-317.

scholarly journals TO EVALUATE THE EFFECT OF MICROWAVE DISINFECTION ON THE HARDNESS OF HEAT CURE AND SELF CURE ACRYLIC RESIN : AN IN - VITRO STUDY

2015 ◽  
Vol 4 (41) ◽  
pp. 7127-7133 ◽  
Author(s):  
Neha Ahuja ◽  
Pakhan A J ◽  
Godbole S R ◽  
Seema Sathe ◽  
Yashshree Sancheti
Keyword(s):  
In Vitro Study ◽  
Acrylic Resin ◽  
Vitro Study ◽  
Heat Cure

scholarly journals Chemical Structure and Physical Properties of Heat-cured Poly(methyl methacrylate) Resin Processed with Cycloaliphatic Comonomer: An In Vitro Study

2020 ◽  
Vol 21 (3) ◽  
pp. 285-290
Author(s):  
Ranganthan Ajay ◽  
Karthigeyan Suma ◽  
Ramajayam Sasikala ◽  
Sekaran Sajidabegum ◽  
Veerakumar Vignesh ◽  
...  
Keyword(s):  
Methyl Methacrylate ◽  
Physical Properties ◽  
Chemical Structure ◽  
In Vitro Study ◽  
Vitro Study ◽  
Poly Methyl Methacrylate

scholarly journals Palatal Vault Depth Influence on the Flexural Strength of Two Heat Cure Acrylic Denture Base Resins: An in vitro Study

2013 ◽  
Vol 14 (6) ◽  
pp. 1131-1136 ◽  
Author(s):  
B Madan Mohan Reddy ◽  
M Himabindu ◽  
B Indira Padmaja ◽  
M Sunil ◽  
N Raja Reddy
Keyword(s):  
Flexural Strength ◽  
Testing Machine ◽  
In Vitro Study ◽  
High Impact ◽  
Vitro Study ◽  
Denture Base ◽  
Heat Cure ◽  
Relationship Of ◽  
Palatal Vault

ABSTRACT Complete dentures often fracture during normal masticatory function. The reason could be due to the shape of the palate, i.e. deep, medium or shallow palatal vault. This in vitro study was performed to determine the relationship of palatal vault depth and flexural strength of two different permanent denture base resins. Edentulous maxillary casts of patients were collected from the department of prosthodontics, among these the cast with the deepest palatal vault was selected. The specimens were then subjected for flexural strength on universal testing machine. The results revealed that the denture bases fabricated on medium palatal vault depth were best in the flexural strength and denture bases on shallow palatal vault depth faired the least. Among the resins the denture bases fabricated using high impact heat cure resin, were better than the denture bases fabricated using regular heat cure resin. All these results were statistically significant except the results between the regular heat cure denture bases and high impact heat cure denture bases fabricated on the deep palatal vault depth. Also the comparison of fracture energies of denture bases fabricated on deep palatal vault with high impact heat cure resin to denture bases fabricated on medium and shallow palatal vaults with high impact heat cure resin were not significant. It was also observed that all the specimens have fractured in the midline. Clinical implications Palatal vault depth significantly affected the flexural strength of heat cure resin. The most frequent mechanical failure of heat cure resin is fracture especially at the midline. The denture bases fabricated using high impact heat cure resin had best flexural strength than the denture bases fabricated using regular heat cure resin which reduced the fractures. How to cite this article Reddy BMM, Himabindu M, Padmaja BI, Sunil M, Reddy NR. Palatal Vault Depth Influence on the Flexural Strength of Two Heat Cure Acrylic Denture Base Resins: An in vitro Study. J Contemp Dent Pract 2013;14(6):1131-1136.

scholarly journals Dimensional accuracy of different impression techniques of partially edentulous mandibular arch

2017 ◽  
Vol 65 (1) ◽  
pp. 25-29
Author(s):  
Rafael Pino VITTI ◽  
Victor Pinheiro FEITOSA ◽  
Ataís BACCHI ◽  
William Cunha BRANDT ◽  
Milton Edson MIRANDA ◽  
...  
Keyword(s):  
Stainless Steel ◽  
In Vitro Study ◽  
Dimensional Accuracy ◽  
Acrylic Resin ◽  
Reference Points ◽  
Vitro Study ◽  
Dimensional Changes ◽  
Mandibular Arch ◽  
Body Techniques

ABSTRACT Objective: The purpose of this in vitro study was to assess and compare the dimensional accuracy of three impression techniques: 1-step putty/light-body, 2-step putty/light-body, and the monophase technique. Methods: A partially edentulous standard stainless steel mandibular arch cast with reference points on the teeth was used to make the impressions. The anteroposterior and transverse distances were measured. All impressions were made with a polyvinyl siloxane using stock metallic (1- and 2-step putty/light-body techniques) or acrylic resin (monophase technique) trays. The monophase impressions were made using a light-body material and the 1- and 2-step putty/light-body impressions with putty and light-body materials. After impression procedures, the accuracy of each technique was assessed measuring the stone casts (n = 5) poured from the impressions using a microscope at 30x magnification and at 0.5 µm accuracy. The data were analyzed statistically using 2-way ANOVA and Tukey's test (p<0.05). Results: Stone casts made by all techniques had significantly negative linear changes (shrinkage). The anteroposterior distances showed more dimensional changes than the transverse distances. The edentulous side showed more shrinkage than the anteroposterior side. Conclusion: No differences between the impression techniques were found, but significant dimensional changes were observed.

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