Gurkaran Preet Singh1, Veena Hegde*2, Prerna Jain3
1.Consultant Prosthodontist, Max Super Speciality Hospital, Mohali, Punjab, 160071 India.
2.Professor and Former Head of the Department, Department of Prosthodontics and Crown & Bridge, Manipal College of Dental Sciences, Manipal, Karnataka 576104 India.
3.Senior lecturer, Department of Orthodontics, Gian Sagar Institute of Dental Sciences, Banur, Punjab,140601 India
This prospective interventional in-vitro study was aimed at evaluating the effect of pre-processing treatment of ridge-lap surfaces of acrylic teeth, on the strength of the bond between the teeth and the denture base resin. Three test groups included application of mono-methylmethacrylate, air-abrasion with 110-µm aluminium oxide particles and combination of the two methods. A total of 40 tooth-acrylic resin samples were equally divided into four groups (three test groups and one control group) and shear load testing was carried out in the Universal testing machine. Tukey post-hoc analysis revealed that Group IV had significantly higher mean compressive strength than Group I (*p<0.05). No significant differences were present in any of the group comparisons. There was a significant effect produced on the shear bond strength of the interface only when both MMA application and air-abrasion of the ridge-lap surfaces was carried out. Fracture analysis revealed that most of the specimens showed cohesive failure at the interface with adhesive failure restricted to control group exclusively. Despite reported progress in the development of denture base resins and artificial tooth materials, the bond between acrylic denture teeth and denture base materials remains unreliable, inconsistent and unpredictable. Adhesive bond strength between denture base resin and artificial teeth constitutes one of the most important considerations in the technical procedure related to the fabrication of removable dentures.
Keywords: Prospective, interventional, in-vitro study, denture base resin, denture tooth, shear bond strength, mono-methylmethacrylate resin, air-abrasion, universal testing machine.