title: Clinical evaluation of a new resilient denture liner. Part 1: Compliance and color evaluation.
abstract: OBJECTIVE
  A new experimental resilient denture liner (MPDS-SL; Lai Laboratories, Burnsville, MN) and Molloplast-B (Buffalo Dental Manufacturing, Syosset, NY) were clinically evaluated for compliance and color change over a 1-year period.
  
  
  METHODS
  In this crossover study, each of 20 patients had 2 dentures fabricated with long-term, silicone-based resilient liners, 1 denture with Molloplast-B and the other with MPDS-SL. Each denture was used for 6 months, during which time each patient kept a journal detailing his or her use and cleaning regimen. The 2 materials were assessed for compliance and color at the beginning of the study and again after 3 months and 6 months of use. Compliance was determined by applying a 3-lb force to the surface of the material following a square-wave pattern, using a closed-loop servohydraulic testing system. The force and position values were recorded using a storage oscilloscope. Compliance was measured at 3 locations on each denture and analyzed using data-acquisition software. Images of the dentures were captured using a zoom stereomicroscope with a charge-coupled video camera and image analysis software. The color was measured at 3 locations on each denture; RGB and L* a* b* were calculated.
  
  
  RESULTS
  Compliance increased from baseline to 3 months and from 3 months to 6 months for almost all locations on both materials. Molloplast-B and MPDS-SL differed in average change in compliance at 6 months; the average change in compliance from baseline to 6 months was 453 (standard error, 46) for Molloplast-B and 284 (standard error, 46) for MPDS-SL (p = 0.019). For both materials, color changed significantly from baseline to 3 months and from baseline to 6 months (p < 0.01). MPDS-SL changed significantly less than Molloplast-B from baseline to 6 months for R (p = 0.039), G (p = 0.037), B (p = 0.005), and L* (p = 0.042).
  
  
  CONCLUSIONS
  For both materials, compliance increased over 6 months of wear. The color change for MPDS-SL was considerably less significant than that for Molloplast-B.
authors.affiliation: School of Dentistry, University of Minnesota, Minneapolis, MN, USA.
authors.forename: Anamaria
authors.initials: A
authors.lastname: Villar
authors.forename: Igor J
authors.initials: IJ
authors.lastname: Pesun
authors.forename: Mary E
authors.initials: ME
authors.lastname: Brosky
authors.forename: Casey
authors.initials: C
authors.lastname: Fines
authors.forename: James S
authors.initials: JS
authors.lastname: Hodges
authors.forename: Ralph
authors.initials: R
authors.lastname: DeLong
authors.forename: Juey H
authors.initials: JH
authors.lastname: Lai
mesh_terms: D000368:Aged; D000704:Analysis of Variance; D001672:Biocompatible Materials / Q000737:chemistry; D003187:Compliance; D003188:Composite Resins / Q000737:chemistry*; D018592:Cross-Over Studies; D003799:Dental Stress Analysis; D003820:Denture Cleansers / Q000009:adverse effects; D003822:Denture Liners; D004129:Dimethylpolysiloxanes / Q000737:chemistry*; D005260:Female; D006244:Hardness; D006801:Humans; D008297:Male; D008422:Materials Testing / Q000379:methods; D008875:Middle Aged; D017646:Organosilicon Compounds / Q000737:chemistry*; D017797:Prosthesis Coloring; D012826:Silicone Elastomers / Q000737:chemistry*; D012833:Siloxanes / Q000737:chemistry*; D013314:Stress, Mechanical; D013997:Time Factors
chemical_list: D001672:Biocompatible Materials; D003188:Composite Resins; D003820:Denture Cleansers; D004129:Dimethylpolysiloxanes; C020964:MDX 4-4210; C479021:MPDS-SL; D017646:Organosilicon Compounds; D012826:Silicone Elastomers; D012833:Siloxanes