A Study Of How Carbon Fabric Weaved Cloth Strengthens The Mechanical Function Of Denture Base

PMMA base are widely used in the making of denture base resin because it has the feature of the easy operation and lower price. But its flexibility is low rigidity is high; there exists the performance of easy broken. To make the denture base with thinnest thickness and highest strength, it is often to use kinds of mechanic ways to improve the strength of the denture base. This experiment compares the PMMA which had strengthened by pre-submerged carbon fibre weaved cloth with the normal PMMA, test the flexure strength and flexure modulus; put the pre-submerged carbon fabric weaved cloth at the centre, closely to the polished surface, closely to the tissue surface of the PMMA testing sample three statuses to research the affects of different insert positions and test the three thickness (1.0mm, 1.5mm, 2.0mm) of the carbon fabric to research the relationship of the thickness and mechanic strength. The results are:1. Comparing the PMMA which had strengthened by pre-submerged carbon fabric weaved cloth with the comparing group the flexure strength and both added obviously, the quantity satisfy the clinic requests.2. Put the pre-submerged carbon fabric weaved cloth at the centre, closely to the polished surface, closely to the organization surface ofthe PMMA testing sample three statuses, the flexure strength test shows, the flexure strength of the middle layer group is bigger than the closely to the polished surface group, the later one is bigger than the closely to the tissue group. The difference both is the statistical difference (P<0.01). The results promoted when using the carbon fabric to do the denture base resin strengthen, should put the corban fabric weaved cloth in the middle of the base. The flexure modulus test results shows, the flexure modulus of the middle layer group PMMA strengthening material has no obvious difference with the same thickness group (P>0.05); the closely to the tissue surface group is bigger than the group closely to the polished surface group. But flexure modulus between the closely to the tissue surface sample and the closely to the polished surface sample has no statistical difference (P>0.05). This result promoting, compare the middle layer group PMMA strengthen material with the compared group, the rigidity has no improvement as increased the denture anti-bending feature, keep a definitely flexibility. The closely to the tissue surface and closely to the polished testing samples have the increased the flexibility, but the anti-bending feature is decreased greatly, they are not suitable to be adapted in the denture base.3. Testing the mechanic feature of three different thickness carbon fabric weaved cloth strengthened PMMA samples shows that after the carbon fabric weaved cloth the flexure strength of 1.0mm thickness PMMA sample is closely to the the flexure strength of 2.5mm PMMA sample. Considering the factors that make the base easy to be broken itis suitable to adapt 1.0-1.5mm carbon fabric weaved cloth strengthened PMMA for the clinic requests.The experiment testified, carbon fabric weaved cloth has the advantages of easy operation, flexible design, lower price, no need of extra equipment, edge easy to be polished, strengthen effect good. It's easy to take into use.