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The effect of different packing methods, silinated glass fiber incorporation and Co-Cr framework involvement on the fit of acrylic denture base at the posterior palatal region | ||
| Journal of baghdad college of dentistry | ||
| Article 1, Volume 21, Issue 4, 2009, Pages 33-38 | ||
| Authors | ||
| Widad AH Alnakkash; Hasanain K.Abdul khalik | ||
| Abstract | ||
| ABSTRACTBackground: Presence of teeth and deep palatal shape decrease the fit of acrylic resin denture to the master castespecially at the posterior region as well as the conventional packing system involves removal of the flasks from thepress to the clamp that create pressure discontinuity may also aggravate the unfit of denture base. The purpose ofthis study is to investigate the effect of tension packing system, incorporation of silinated short glass fiber, and Co-Crframework involvement on the fit of acrylic resin denture base at the posterior palatal region of deep palate modelin presence of teeth.Material and Method: A silicon mold was used to prepare a (60) type VІ stone master cast ,(30)casts were used inconventional packing system and the other half for tension packing system ,where each main group weresubdivided into three sub groups (control , silinated short glass fiber, and Co-Cr framework involved groups) eachconsist of( 10) samples. Acrylic dough was prepared and packed, in tension packing system the flasks were placedbetween the metal plates of tension device and the screws nuts were tightened before the final definitive closure,short curing cycle was undertaken. Short glass fiber groups samples were prepared using the same conventionaldenture base construction steps except for the addition of silinated short glass fiber(4mm) in (2%) concentration. Co-Cr framework was fabricated to occupy2/3 of palate, then acrylic resin –metal combination denture base wereconstructed. Samples were cut anterior to the posterior palatal seal area. The gap space between the acrylic baseand the master cast was measured by travelling microscope.Results: The results showed different fit of acrylic denture base to the cast at the different points in each samplewhere the ridge crests and the marginal borders points showed good fit in contrast to the mid palatal points thatrevealed the poorest fit in all the tested groups. The Co-Cr groups showed the highest fit, followed by glass fibergroups while, the poorest fit were in the control groups.Conclusion: It is concluded that Co-Cr framework involvement, incorporation of silinated glass fiber, and/or tensionpacking system had increased the fit in different grades.Key words: Fit, Packing, Co-Cr, Silinated glass fiber. (J Bagh Coll Dentistry 2009; 21(4): 33-38). | ||
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