5Shape of Relief AreaIt is never well defined. It merges into the surrounding fitting denture surface.It depends on the compressibility of the area to be relieved as wellas that of the surrounding areas.
11II- Automatic Relief (Selective Pressure Impression Technique) B- Secondary impression in Zn/O eugenol or plaster.A- Scraping the compoundselectively.
12Value of ReliefRelief of sensitive areas increases the comfort of the patient.Relief of hard areas improves the denture stability, so itProlongs the duration of denture service by compensating for denture settling and some ridge resorption .Compensate for polymerization shrinkage.
14Definitions1- Posterior palatal seal : “ A slight elevation at the posterior border of the maxillary denture .”
15Definitions2- Post damming : “ Slight compression of the soft tissues along the posterior border of the denture whether upper or lower .”
16Definitions3- Posterior palatal seal area “Area of resilient soft tissue at or beyond the junction between hard & soft palate, on which pressure within physiologic limits of tissue can be applied by the posterior border of the denture to aid in denture retention.”
17Position of the Post dam area Posterior vibratingline