There are basically two types of direct retainers: 1. 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. The surface-tension model describes the interactions of a thin layer of fluid between two surfaces. Basic principles of complete denture impression making were introduced in the middle of nineteenth century which were a. Concepts of atmospheric pressure. He considered that the only active force in denture retention was interfacial surface tension. Goals of retention. 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. Discussion Recording of denture bearing tissues for complete dentures is important from many aspects like health of the tissues, function and retention of dentures. Abstract— Denture retention by atmospheric pressure is discussed. 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 … [7, 8] A retentive pressure within the liquid-filled space develops and facilitates denture retention. 45-51 Of these, interfacial surface tension associated with the saliva layer between the denture base and supporting soft tissues is quite important. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Cohesion, adhesion, friction, gravity, surface roughness, and atmospheric pressure are regarded as playing a lesser to no role in retention. In the case of a complete denture, the behavior of saliva along the denture-mucosa interface is theorized. ... -relief for comfort and denture retention/stabilty. It is only workable when there is lower pressure under the denture and occurrence of vaccum. 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. c. Equal distribution of pressure. The most commonly listed factors of retention include adhesion, cohesion, interfacial surface tension, gravity, intimate tissue contact, peripheral border seal, atmospheric pressure and … The atmospheric pressure is considered to have some role in complete denture retention. Adecrease in pressure to less than atmospheric pressure is not necessary to explain this adhesion; the thin- The denture base can provide some retention by adhesion, cohesion, atmospheric pressure, polished surface contours, and gravity. 1,10-12 Presence of intact border seal is ... of this dynamic region greatly enhances border seal and increases maxillary complete denture retention. RETENTION. Some factors that influence complete denture retention are adhesion, cohesion, interfacial force, oral and facial musculature, atmospheric pressure, undercut, … However, it is questionable whether atmospheric pressure plays as important a role in retention of removable partial dentures because a border seal cannot be obtained as readily as it can be with complete dentures. of atmospheric pressure. Maximum extension of denture bearing area. Succinctly stated, denture retention depends upon tissue contact. Obtaining optimum physical retention The aspects of complete dentures that influence the amount of physical retention are: border seal area of impression surface accuracy of fit. The diagnostic evaluation and placement of posterior seal are often given only minor attention in complete denture construction. Abstract— Denture retention by atmospheric pressure is discussed. He advocated that the denture flanges should be kept short and thin, enough to prevent lateral skidding of the denture. DOI: 10.14260/jemds/2014/3020 REFERENCES: (1.) The retention of the denture is of utmost interest to the patient and a matter of great satisfaction to the dentist. Factors affecting retention - Biological factors - i). Factors affecting Retention , stability and support in complete denture. A potential space which is enclosed by a salivary meniscus exists between a denture base and the oral mucosa. Retention of Denture Bases. 1907: Green brothers " Modeling compound" Precision or semi-precision attachments. 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 Adhesion, cohesion, and atmospheric pressure had nothing to do with denture retention. One might ask what air pressure has to do with removable prosthetics. 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 is the reason why I was able to show that both atmospheric pressure and tissue contact contribute to 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. Denture retention - physical agent • Cohesion • Adhesion • Surface tension • Capillary attraction • Atmospheric pressure 5/8/ ... Blahova Zora et al: Physical factors in ... 18:90-7.CrossRefGoogle Scholar ... Effect of reduced atmospheric pressure upon retention of dentures. The selective pressure theory is the most widely respected and accepted theory. Retention in CD is an old topic about which very few people show interest to learn but keeping in mind the views of a patient, it is an OPTIMUS PRIME aspect. The rheology of some simple models is set out in context, and the dynamic nature of the problem is emphasized. A potential space which is enclosed by a salivary meniscus exists between a denture base and the oral mucosa. 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