The validity of pressure indicating film for the measurement of occlusal forces transmitted to distal extension removable partial denture made by dual impression technique.
Manal R Alammari, Lana A Shinawi and Seham B Tayel
Oral and Maxillofacial Dep. King Abdulaziz University Saudi Arabia
Abstract: The study aimed to measure clinically the occlusal force, and the force transmitted underneath two different distal extension removable partial dentures fabricated according to different types of dual impression technique. Ten male patients with mandibular class I Kennedy classification recruited, two metal frameworks were made for each (fluid wax impression (Denture A) and selected pressure impression (Denture B). Both dentures were fabricated according to altered cast technique, and then pressure indicating film (PIF) was used to record the occlusal force as well as the force transmitted to supporting tissues beneath each denture at the molar region. The processed (PIF) and color calibration swatch were scanned. Photoshop program was used to get the color density and to determine the amount of pressure. The force beneath denture (A) was significantly lower than that measured in denture (B) at 5% level (P=0.008). High-localized pressure transmission was observed in the PIF opposite molar region in the distal extension RPD (B).The PIF enables to measure in vivo the pressure distribution under distal extension base of RPD. Furthermore, functional impression using fluid wax could be the impression of choice to minimize load induced by RPD, it provides more even force distribution and be more temperate to supporting oral tissues.
[Manal R Alammari, Lana A Shinawi and Seham B Tayel. The validity of pressure indicating film for the measurement of occlusal forces transmitted to distal extension removable partial denture made by dual impression technique. J Am Sci 2012;8(10):367-372]. (ISSN: 1545-1003).http://www.jofamericanscience.org. 54
Keywords: Dual impression technique, pressure-indicating film, bite force, RPD. Full Text 54