Estudio preliminar sobre el uso de ？provisionales envolventes？

introduction: with this preliminary study it is sought to show that inside the oral cavity changes of pressure infludying the tissues take place, based on the pneumatic explanation of p. harster, and also that using ？covering provisionals？ we can take advantage of these changes to obtain more gingival volume. material and methods: the making of a ？covering provisional？ is explained, whose objective is to increase the gingival volume. a device for measuring changes of pressure inside this provisional was designed and made. all changes were registered. results: about gingival growth under the ？covering provisional？, the results were positive, observing increases that reach 2mm in 3 weeks. concerning changes of intraoral pressure, descents around the basal one inside the ？covering provisional？ were registered, in relation of the carried out maneuver. conclusions: inside uncollapsables and not hermetic cavities defined by ？covering provisionals？, and in continuity with the oral cavity,variations of pressure take place around a basal one, and you can see them during several maneuvers as deglution. with the use of ？covering provisionals？ we take advantage of this vacuum, being able to obtain controlled gingival growth.