As the removal offemoral bone cement is one ofthe most challenging tasks in cemented Total Hip Revision, a lot of different technical devices have been developed to aid the surgeon. All oftheirpros and cons are partly consequences of the specific system-design but mainly arisefrom the basic physical principles used. Tlie known methods and devices äs well äs their datahandling have therefore been analysed, reduced to their principles according to the criteria ofsystematic engineering design and systematised in order to provide a better comparability and starting point for the development of ne\v devices.
This study compared polyvinylsiloxane with polyether in handling dental impressions. Materials and Methods: Each participant (N = 39) made four impressions, each a combination of pickup and reseating techniques with polyether or polyvinylsiloxane, of one implant cast representing a specific clinical situation (tooth gaps, limited residual dentition, or edentulous jaw). Handling of impressions was subsequently rated by using a 12-item questionnaire with 100-mm visual analog scales. Results: While mean satisfaction scores were higher for polyvinylsiloxane than for polyether (69.5/63.0, P < .001), differences among subgroups were statistically significant only for pickup technique, limited residual dentition, and edentulous jaw. Conclusion: Implant impressions made with polyvinylsiloxane using a pickup technique seem to be the best option for most clinical situations.
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