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prosthodontics fixed partial denture connector complete denture retainers cast partial denture fpd distal extension framework indirect retention cpd articulator kennedy tooth preparation removable partial denture stress biomechanical principles rpd denture heat cure acrylic major connector attachment rests and rest seats denture metal denture metal crown direct retainer pontic teeth arrangement teeth fixed dental prosthesis crown and bridge partial denture steps in complete denture edentulism pps gpt maxillary relief limiting muscles dental specialty crown cutting anterior porcelain ceramic chamfer shoulder aamir godil lever fulcrum lines cast metal full veneer components retainer broad coverage hinge split pier tilted cantilever periodontal biologic width lattice mesh condylar guidance incisal guidance maxillectomy aramany obturator surgical centric relation designing kennedy's indirect retainer applegates rules surveying impression materials papilla raphae rugae frenum vestibule palate tooth supported clasp assembly akers rpi reciprocal abutment metallurgy lingual bar linguoplate class 1 alloy stress breaker stress equalization physiologic basing snowshoe effect