flexural strength of gingival color composite vs self cure resin

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A Comparison study on the flexural strength of gingival color composite versus the conventional self cure resin as a reparative material for broken denture bases.:

A Comparison study on the flexural strength of gingival color composite versus the conventional self cure resin as a reparative material for broken denture bases.

The Invent of Dentures has made the service of Dentistry more expanded and satisfactory for patients with lost teeth. :

The Invent of Dentures has made the service of Dentistry more expanded and satisfactory for patients with lost teeth. But the common problem encountered is the occurrence of fracture in Denture resin base mostly due to poor fitting, imbalance occlusion, improper manufacturing and inadequately strengthened materials .

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Therefore, one way to prevent fractures is proper care and using materials with adequate strength and stability . In the event of fracture, Conventional self-cure resin is widely used for repair due to its high Flexural strength. But ,its being time-consuming and Allergic reactions to its component- Methyl Methacrylate Monomer encountered in patients, technicians and even dentists, Therefore ; Alternative methods should be used. (Suvarna et. Al, 2012 )

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Gingival Color Composite lacks this Allergic reaction, takes less time for repair, has simpler processing technique and comes in different pink color shades . Therefore ;

This study aims to::

This study aims to: Compare the flexural strength of the Gingival color composite and the conventional self-cure resin in repairing broken denture base.

Submitted by::

Submitted by: Edalat , Mohammad

General Objective::

General Objective: Compare the Gingival color composite resin with conventional self-cure resin in repairing broken dentures, in terms of flexural strength.

Specific Objectives;:

Specific Objectives; To measure the flexural strength of Gingival color composite and conventional self-cure resin individually To compare their flexural strength using 3 point bending test by Universal Testing Machine.

Scope & Limitations:

Scope & Limitations This study only compares the two abovementioned materials in terms of Flexural strength , and other parameters are not included.

Significance of the study; :

Significance of the study; The result of this study may help the Dental community by offering a faster method, more convenient, more patient friendly dental reparative material with no Methyl Methacrylate Monomer as allergen , which is at the same time comparable to the conventional self-cure resin.

Hypothesis;:

Hypothesis; At the end of the study the researcher predicts that: Null Hypothesis: There is no significant difference between the flexural strength of gingival colour composite and self-cure resin. Alternative Hypothesis : There is a significant difference between the flexural strength of gingival colour composite and self-cure resin.

REVIEW OF RELATED LITERATURE:

REVIEW OF RELATED LITERATURE In the study of Suvarna et. Al (2012) , The resin used in fabrication and repair of broken dentures and temporary fixed partial dentures are known to cause allergic reactions to patients which can be confirmed by performing patch test. Alternatives to this materials used for fabrication of temporary restoration and complete dentures are intended to prevent these allergic reactions such as allergic stomatitis.

REVIEW OF RELATED LITERATURE:

REVIEW OF RELATED LITERATURE The Light-cure denture base(Gingival color composite type), mixed with Urethane dimethyl acrylate is biocompatible material and fully replaces the acrylic resin system. It should not only match the physical and mechanical properties of the acrylic resins but also the manipulation and economy should be in favour of the system ( Shah et al.2011)

REVIEW OF RELATED LITERATURE:

REVIEW OF RELATED LITERATURE The flexural strength of some reparative materials were tested using the 3 point bending test via the Universal Testing Machine ( Department of prosthodontics of Istanbul University, the journal of advanced prostothondics 2011 )

Methodoly :

Methodoly RESEARCH DESIGN- An EXPERIMENTAL TYPE of study was done to compare the flexural strength of Gingival color composite resin and the conventional self cure resin base in repairing fractured dentures using special methods.

Methodology :

Methodology Preparation of Molds Dental Molds were prepared using a mixture of Dental stone and water poured in a Flask , and a pink wax of 8x4x0.3 cm was placed inside the mixture and dried. Separating medium was applied on the surface of the dried dental stone and to have an accurate diameter, the upper portion of the flask covered the lower portion , poured with the mixture of the dental stone, and allowed to dry under the pressure using a pressor . The upper portion of the flask then uncovered the lower portion and the pink wax was removed leaving an embedded molds with the desired measurements.

Methodology:

Methodology Conventional self-cure resin Self-cure resin and Monomer were mixed and poured in the prepared Mold which was already covered by a layer of separating medium. This was then covered by a layer of plastic. The prepared upper portion of the flask covered the Mold. Pressure dried. Mold was then uncovered, self-cure-resin was then removed with the desired measurements. 10 samples with this mixture were prepared.

Methodology:

Methodology Gingival color composite Gingival Color composite was poured into the Mold, covered by a layer of plastic followed by the upper portion of the flask , was put under pressure to have an accurate diameter, size and shape, was then uncovered and all portions of the mold were light-cured. Plastic cover was then removed. 10 samples with this material were prepared.

Methodology:

Methodology For testing the flexural strength, 20 samples were divided In 2 groups: Group A with 10 samples of conventional self-cure resin. Group B with 10 samples of gingival color composite.

Methodology:

Methodology Each sample was tested with the “ 3 point bending test” using the universal testing machine where the tensile and compressive strength of each sample was tested using application of loads via a force transducer with corresponding calibrations denoting the amount of load applied to each. Bending & fracture point of Each sample was then noted.

Methodology:

Methodology Tensile and flexural strength of each sample was determined via the corresponding calibrations, plotted and compared using the T-test Method : X _ µ T = S/ n-1  

DATA ANALYSIS:

DATA ANALYSIS Data gathered were organized and entered into the computer using Excel 2013 . Information was summarized using graphs. Statistical tools were applied.

Results and Analysis :

Results and Analysis Figure 1. Minimum and Maximum load applied to Gingival colour composite samples resulting them to fracture Minimum load of fracture occurrence was 60 kg resulting in 1 fracture and the maximum load of fracture was 66 kg , resulting in another one fracture . Figure 2. Minimum and Maximum load applied to Conventional self-cure resin samples resulting them to fracture Minimum load of fracture occurrence was 86 kg resulting in 1 fracture and the maximum load of fracture was 88 kg , resulting in 6 fractures. Gingival color Composite samples Conventional self-cure resin samples

Results and Analysis :

Results and Analysis Mean Variance Observation Conventional self-cure resin samples 87.5 0.5 10 Gingival color-composite samples 64.4 0.9333 10 Conventional self-cure resin samples had a Higher mean fracture point of 87.5 kg , compared to the mean fracture point of Gingival color composite samples at 64.4 kg . Table 1. Mean, Variance and observation of the samples

Results and Analysis :

Results and Analysis Results were plotted and compared by T-Test , with the level of significance / alpha value at (0.05) 5% , and the P-value obtained of 1.106 . 1.106 < 5 P-value was smaller than the Alpha value Therefore ;

Discussion, Conclusion and Recommendation:

Discussion, Conclusion and Recommendation Null Hypothesis: There is no significant difference between the flexural strength of gingival colour composite and self-cure resin. Alternative Hypothesis : There is a significant difference between the flexural strength of gingival colour composite and self-cure resin .

Discussion, Conclusion and Recommendation:

Discussion, Conclusion and Recommendation Results confirm that there is a significant difference in the flexural strength of Gingival colour composite and Conventional self-cure resin samples in repairing broken denture bases , denoting that Conventional self-cure resin samples have a higher tensile and compressive strength as compared to samples made of Gingival colour composite

Discussion, Conclusion and Recommendation:

Discussion, Conclusion and Recommendation Further studies are recommended to : 1.Use other parameters other than flexural strength as means of comparison of the tested materials. 2. Although this study confirms that Conventional self-cure resin has a higher tensile and compressive strength, Gingival colour composite is still used in cases of allergic reactions to the resin, hence further studies are recommended on the parameters in improving the said material .

References :

References Lynch, E. C. (2004). The revolution in dentistry (6th ed., Vol. 2). Goldstein, R. E. (1998). Esthetics in dentistry (Vol. 2). Soratur , S. H. (2006). Essential of prosthodontics (Vol. 4). 2.Tandon, R. C. (2010). Dental base material: from past to future (Vol. 5). Clancy, J. M. (2007) Arative bond strengths of light-cured heat, heat-cured, and auto polymerizing denture resins to denture teeth .

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