title: Influence of denture adhesives on occlusion and disocclusion times.
abstract: BACKGROUND
  The effectiveness of adhesives in enhancing several functional aspects of complete denture performance has been well established. The direct influence of adhesives on occlusal contact simultaneity has not yet been investigated.
  
  
  OBJECTIVE
  The purpose of this crossover clinical trial was to evaluate quantitatively the influence of adhesives on occlusal balance by recording timed occlusal contacts; namely occlusion time (OT) and disocclusion time during right (DT-right) and left (DT-left) excursions by using computerized occlusal analysis.
  
  
  METHODS
  A crossover clinical trial was adopted. Assessments were carried out while participants (n=49) wore their dentures first without then with adhesives. Computerized occlusal analysis using the T-Scan III system was conducted to perform baseline computer-guided occlusal adjustment for conventionally fabricated dentures. Retention and stability assessment using the modified Kapur index and recording of OT and DT-right and DT-left values using the T-Scan III were subsequently carried out for all dentures, first without adhesives and then after application of adhesive. All T-Scan procedures were carried out by the same clinician. Wilcoxon signed-rank test was used to analyze the Kapur index scores and occlusal parameters (α=.05).
  
  
  RESULTS
  Stability and retention of conventional dentures ranged initially from good to very good. However, adhesive application resulted in significant improvement (P<.001) in stability and retention and a significant decrease in duration of all occlusal parameters (OT [P=.003], DT-right [P=.003], and DT-left [P=.008]).
  
  
  CONCLUSIONS
  Adhesives significantly decreased OT and DT durations in initially well-fitting complete dentures with fairly well balanced occlusion, and further enhanced denture stability and occlusal contact simultaneity.
authors.affiliation: Associate Professor, Oral and Maxillofacial Prosthodontic Department, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia; and Removable Prosthodontic Department, Faculty of Dentistry, Minia University, Egypt.
authors.forename: Mohamed Hussein
authors.initials: MH
authors.lastname: Abdelnabi
authors.affiliation: Associate Professor, Oral and Maxillofacial Prosthodontic Department, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia; and Removable Prosthodontic Department, Faculty of Oral and Dental Medicine, Cairo University, Egypt. Electronic address: amalswelem@hotmail.com.
authors.forename: Amal Ali
authors.initials: AA
authors.lastname: Swelem
authors.affiliation: Associate Professor, Oral and Maxillofacial Prosthodontic Department, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia.
authors.forename: Ayman A
authors.initials: AA
authors.lastname: Al-Dharrab
mesh_terms: D000269:Adhesives; D018592:Cross-Over Studies; D003766:Dental Occlusion; D003767:Dental Occlusion, Balanced; D003781:Denture Retention; D003824:Denture, Complete; D006801:Humans; D008409:Mastication / Q000502:physiology*
chemical_list: D000269:Adhesives