The retention is dependent upon many factors as the forces of adhesion, cohesion, interfacial surface tension, gravity, intimate tissue contact, peripheral (border seal), atmospheric pressure, and neuromuscular control. c. Equal distribution of pressure. Retention must hold the denture in its position when it is seated at rest. [7, 8] A retentive pressure within the liquid-filled space develops and facilitates denture retention. Principles of Support, Retention and Stability of Complete Dentures •Primary retention Physical forces Cohesion Adhesion Interfacial surface tension Capillarity Atmospheric pressure Gravity •Adhesion Force of attraction between two unlike molecules Denture-saliva-mucosa This mechanism is independent and not related to that of atmospheric pressure differentials. Theories of denture retention have suffered from confusion of model, algebraic errors, and misapprehension of the physics of capillarity, adhesion and cohesion, as well as the role of atmospheric pressure. One might ask what air pressure has to do with removable prosthetics. The surface-tension model is only one of many potential retentive forces, as it alone cannot account for retention from sheer-related displacements. Atmospheric Pressure. Effects of reduced atmospheric pressure upon retention of denture Ask for details ; Follow Report by KrantHi4081 01.12.2017 Log in to add a comment Atmospheric pressure. Abstract— Denture retention by atmospheric pressure is discussed. Disclaimer: This essay has been written and submitted by students and is not an example of our work. Wettability offers a more feasible method of reducing marginal leakage.8 In the case of denture retention, the thin isolated layer of saliva between the denture and the mucosa (Fig 11) undergoes a change in properties. atmospheric pressure, viscosity and volume of saliva, gravity, muscle posturing and occlusion on denture retention has been documented 2. pressure. Retention is the constant relation of the denture base to underlying soft tissues while stability is the relation of the denture base to underlying bone. The retention of the denture is of utmost interest to the patient and a matter of great satisfaction to the dentist. THE BIOMECHANICAL BASIS OF RETENTION IN COMPLETE DENTURES Factors affecting the retention of dentures Retention is the resistance of the denture to removal along its path of insertion.Strictly speaking, the term stability refers to the resistance of the denture to forces tending to displace it by acting in any direction other than along its path of insertion. The atmospheric pressure is considered to have some role in complete denture retention.It is only workable when there is lower pressure under the denture and presence of vaccum.The vaccum is created by applying pull which increase the volume between denture base and underlying tissue to maintain seal around some area for lower pressure to be constant.Thus the retention is produced … Retention of denture bases is result of following forces: 1) adhesion 2) cohesion 3) atmospheric pressure* 4) physiological molding of tissue around polished surfaces of denture 5) effect of gravity on mandibular denture denture retention include Adhesion, Cohesion, Interfacial surface tension, Atmospheric pressure, Capillary attraction and Gravity. He advocated that the denture flanges should be kept short and thin, enough to prevent lateral skidding of the denture. The selected pressure is achieved by altering the spacer thickness. 1883: Ames and the Greene brothers introduced atmospheric pressure as a means of denture retention and recommended the use of functional denture borders as opposed to passive borders in the fabrication of complete dentures. There are basically two types of direct retainers: 1. Basic principles of complete denture impression making were introduced in the middle of nineteenth century which were a. Concepts of atmospheric pressure. This is the reason why I was able to show that both atmospheric pressure and tissue contact contribute to denture retention. A potential space which is enclosed by a salivary meniscus exists between a denture base and the oral mucosa. Abstract— Denture retention by atmospheric pressure is discussed. Denture bases should be designed and fabricated so that they will contribute as much retention to the partial denture as possible. Earlier single impression was thought sufficient for Stability must resist displacement by rocking when a force is applied to teeth over a limited area. IN COMPLETE DENTURE Specific learning objectives 1. Start studying Retention and stability of complete dentures. Maximum extension of denture bearing area. Atmospheric pressure is the only factor dependent upon this tissue contact that does not work entirely between the denture base and the tissues. The difference in air pressure from the outside of a denture and the intaglio surface presses the denture against the denture-bearing ridge, similar to the pressure differential that creates lift on the inferior surface of an airplane wing. weight of the atmosphere help to resist dislodging forces and is directly proportional to the surface area covered by the denture. The denture base can provide some retention by adhesion, cohesion, atmospheric pressure, polished surface contours, and gravity. 3. ... -relief for comfort and denture retention/stabilty. b. Succinctly stated, denture retention depends upon tissue contact. Adhesion, cohesion, and atmospheric pressure had nothing to do with denture retention. Here, the idea is to vary the pressure over the denture seat (which is a single unit) depending on the displace ability of the supporting tissues and hence transferring the load over to the selected areas of the seat. When the denture is dislodged, this space is forced to expand and the meniscus recedes, but the recession is impeded by the viscosity of the saliva and a negative pressure is generated under the denture.
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