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Khanna A.,Terna Dental College and HospitalMaharashtra | Bhatnagar V.M.,Terna Dental College and HospitalMaharashtra | Karani J.T.,Terna Dental College and HospitalMaharashtra | Madria K.,Yogita Dental CollegeMaharashtra | Mistry S.,Terna Dental College and HospitalMaharashtra
Journal of Clinical and Diagnostic Research | Year: 2015

Background: Soft denture liners are widespread materials used in prosthetic dentistry. Their mechanical properties have to meet several key requirements such as adequate bond to denture base resins in order to provide right function of masticatory system and oral hygiene. AIM: To evaluate and compare the shear bond strength between two commercially available liners and polymethyl methacrylate (PMMA) denture base resin with different surface treatments. Materials and Methods: The two soft denture liners - Luci-Sof (silicone based liner) and Super-Soft (acrylic based liner) and a polymethyl methacrylate denture base resin (Trevalon) were chosen for the study. A total of 80 samples were made, 40 each for each of the two materials under investigation. The 40 samples were further divided into four groups, containing 10 samples each. Group I: Consisted of an untreated surface of polymethyl methacrylate which acted as the control. Group II: The surface of polymethyl methacrylate surface was sandblasted. Group III: The polymethyl methacrylate surface was treated with monomer. Group IV: The lining material was processed with acrylic resin dough. The samples after thermocycling for 500 cycles with temperatures from 5° ± 1°C to 55° ± 1°C and a 60 sec dwell time were subjected to shear loading on universal testing machine at crosshead speed of 20mm/sec. A Scanning Electron Microscope and stereomicroscope analysis of the bond interface between the liner and the denture base was conducted for all the groups of the two materials under study. Statistical Analysis: Data was analyzed using independent samples t-test, analysis of variance (ANOVA) and Post-Hoc Analysis. A significance level of α = 0.05 was used for statistical analyses.Results: The bond strength was significantly different between Super- Soft and Luci-Sof (p<0.05) for all surface treatments. The scanning electron microscopy observations showed that the application of surface treatments modified the surface of the denture base resin.Conclusions: Super-Soft exhibited significantly higher bond strength than Luci-Sof. It was observed that Super-Soft when packed with the pre-polymerized samples produced highest bond strength values among all the groups for both the materials under study. The lowest bond strength was achieved for pre-polymerized samples when packed with Luci-Sof. © 2015, Journal of Clinical and Diagnostic Research. All rights reserved. Source


Mohan Bhatnagar V.,Terna Dental College and HospitalMaharashtra | Karani J.T.,Terna Dental College and HospitalMaharashtra | Khanna A.,Terna Dental College and HospitalMaharashtra | Badwaik P.,Terna Dental College and HospitalMaharashtra | Pai A.,Terna Dental College and HospitalMaharashtra
Journal of Clinical and Diagnostic Research | Year: 2015

Osseointegration of dental implants has been researched extensively, covering various aspects such as bone apposition, biomechanics and microbiology etc however, physiologic integration of implants and the associated prosthesis in the body has received very little attention. This integration is due to the development of a special sensory ability, which is able to restore peripheral sensory feedback mechanism. The underlying mechanism of this so-called ‘osseoperception’ phenomenon remains a matter of debate. The following article reveals the histological,neurophysiologic and psychophysical aspects of osseoperception. A comprehensive research to provide scientific evidence of osseoperception was carried out using various online resources such as Pubmed, Google scholar etc to retrieve studies published between 1985 to 2014 using the following keywords: “osseoperception”, “mechanoreceptors”, “tactile sensibility”. Published data suggests that a peripheral feedback pathway can be restored with osseointegrated implants. This implant-mediated sensory-motor control may have important clinical implications in the normal functioning of the implant supported prosthesis. © 2015, Journal of Clinical and Diagnostic Research. All rights reserved. Source

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