Impression material is carefully syringed around the implant abutments or transfer copings and the resilient material tray placed in the mouth. Tray designs may be open or closed - a choice reflected in the selection of impression transfer coping and discussed in greater detail in another section. Rigid impression trays made on stone casts with appropriate wax relief to accommodate implant abutments plus transfer coping’ positions.In addition, these images may also serve as a reference point for monitoring future marginal bone levels. Individual implant periapical films should be made to ensure correct abutment and coping seating.The optimal impression making protocol requires specific clinical and laboratory techniques - especially designed rigid custom trays, impression transfer copings (splinted or unsplinted), resilient impression materials and laboratory implant analogues that match impression-retained transfer copings. Capturing functional movements of the patient's intra-oral musculature through border molding lends to a successful outcome by minimizing the risk of overextended overdenture base extensions. Clearly, the overall objectives of the impression making procedure are different to those when making impressions for implant fixed prostheses where proper denture base extensions and mucosal support are not needed. The objective is a shared retention and force distribution between implants and soft tissues, while ensuring necessary support from denture bases. Impression making in implant overdenture therapy simultaneously records healthy available denture-bearing tissue surfaces and implants’ positions in edentulous arches. Soft tissue surface and implant position recording
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