Abstract: A polymerisable resin injection moulded denture is manufactured by making a first impression in a stock impression tray and producing a first cast model therefrom, providing a second impression tray special to the patient by forming a thermo plastic resin sheet on the first cast model, the resin sheet being such as to provide stability equivalent at least to that of 0.75 mm of stainless steel sheet, using said second impression tray with suitable adhesive to take a second accurate impression in silicone-free alginate impression material giving set volume stability to within 0.005% and from it making an accurate model die upon which a way replica denture is constructed and a mould thereof is produced of dental gypsum in a special flask which during injection moulding is subjected to progressive adjustment of clamping pressure between mould halves with rising injection pressure.