title: Comparison of retention between maxillary milled and conventional denture bases: A clinical study.
abstract: BACKGROUND
  Clinical studies comparing the retention values of milled denture bases with those of conventionally processed denture bases are lacking.
  
  
  OBJECTIVE
  The purpose of this clinical study was to compare the retention values of conventional heat-polymerized denture bases with those of digitally milled maxillary denture bases.
  
  
  METHODS
  Twenty individuals with completely edentulous maxillary arches participated in this study. Definitive polyvinyl siloxane impressions were scanned (iSeries; Dental Wings), and the standard tessellation language files were sent to Global Dental Science for the fabrication of a computer-aided design and computer-aided manufacturing (CAD-CAM) milled denture base (group MB) (AvaDent). The impression was then poured to obtain a definitive cast that was used to fabricate a heat-polymerized acrylic resin denture base resin (group HB). A custom-designed testing device was used to measure denture retention (N). Each denture base was subjected to a vertical pulling force by using an advanced digital force gauge 3 times at 10-minute intervals. The average retention of the 2 fabrication methods was compared using repeated ANOVA (α=.05).
  
  
  RESULTS
  Significantly increased retention was observed for the milled denture bases compared with that of the conventional heat-polymerized denture bases (P<.001).
  
  
  CONCLUSIONS
  The retention offered by milled complete denture bases from prepolymerized poly(methyl methacrylate) resin was significantly higher than that offered by conventional heat- polymerized denture bases.
authors.affiliation: Faculty, Department of Prosthetic Dental Sciences, College of Dentistry, King Saud University, Riyadh, Saudi Arabia. Electronic address: alhelal.abdulaziz@gmail.com.
authors.forename: Abdulaziz
authors.initials: A
authors.lastname: AlHelal
authors.affiliation: College of Dentistry, University of Dammam, Dammam, Saudi Arabia.
authors.forename: Hamad S
authors.initials: HS
authors.lastname: AlRumaih
authors.affiliation: Professor and Director, Advanced Specialty Education Program in Prosthodontics, Loma Linda University School of Dentistry, Loma Linda, Calif.
authors.forename: Mathew T
authors.initials: MT
authors.lastname: Kattadiyil
authors.affiliation: Professor, Hugh Love Center for Research and Education in Technology, Loma Linda University School of Dentistry, Loma Linda, Calif.
authors.forename: Nadim Z
authors.initials: NZ
authors.lastname: Baba
authors.affiliation: Distinguished Professor, Loma Linda University School of Dentistry, Loma Linda, Calif.
authors.forename: Charles J
authors.initials: CJ
authors.lastname: Goodacre
mesh_terms: D000368:Aged; D017076:Computer-Aided Design; D003775:Dental Polishing / Q000379:methods; D003799:Dental Stress Analysis; D003819:Denture Bases; D003779:Denture Design; D003781:Denture Retention / Q000379:methods*; D003827:Denture, Complete, Upper; D005260:Female; D006801:Humans; D008297:Male