Firm healthy Mucosal covering over the ridge B. Flabby ridges C. Knife edge with movable mucosa D. When sharp bony spicules are present in the ridge Ans: A. Final impression materials for complete denture construction include the following: zinc oxide eugenol pastes (ZOE), elastomeric impression materials and tissue conditioners [6] [7]. The aim of the impression technique is to control the impression pressure by seeking and providing support in the stress-bearing Altered cast not needed in. 45.6% used Selective pressure technique for making final impression, while 32.0% used Mucocompressive technique and 22.3% mucostatic technique. for selective pressure impressions for total dentures’ treat-ment by patients who had different kind of localization and abnormalities of the thickness and mobility of the alveolar ridges’ mucosa. Altered cast is **most commonly needed for. The theory of mini-mal‐pressure employs the principles of mucostatics. techniques can be broadly divided into pressure, non pressure and selective pressure techniques.3 Dynamic impression techniques were also proposed with the intent of maximizing support from underlying tissues.4 The changes in impression techniques can be attributed to evolution of newer impression materials and better understanding of underlying tissues. The maxillary borders were recorded by selective pressure impression technique using green stick compound (Figure 13). The techniques can be grouped into mucostatic, mucocompressive, selective pressure, functional, and neutral zone impression techniques. 1 was checked for adaptation and extension and modified whenever required. This impression philosophy is credited to Boucher 5 and is based on a histologic understanding of the supporting tissues. However, the viscoelastic rheological properties of impression materials, particularly the time-dependent viscoelastic changes in impression material immediately after tray seating, are unknown. This impression philosophy is credited to Boucher5 and is based on a histologic under- standing of the supporting tissues. The selective pressure technique is based on the selective pressure theory, which was proposed by Carl O. Boucher. #MCQ 19 - Selective Pressure Impression Technique is indicated in: A. Dental practitioners can make the impression in a single stage (abbreviated impression) or in two stages (preliminary impression made for the purposes of diagnosis, or for the construction of a tray, followed by final impression). 72.1% of the practitioners use physiological method (intra-oral technique) to record posterior palatal seal while 27.9 of them use arbitrary scraping method (extra-oral technique). Areas that are anatomically favorable to withstanding pressure, such as the buccal … In the first stage, the practitioner makes a preliminary impression with a rigid or elastic material using the one-step technique.After the material sets, the impression is sent to the dental laboratory. Selective pressure theory: Advocated by Boucher in 1950, it combines the principles of both pressure and minimal pressure techniques. ridge resorption, ranging from localized pressure to systemic factors (3). Reinforcement of the denture base over the implants may be recommended to increase resistance of fracture when mucostatic or selective pressure impression technique is used. impressions, including mucostatic mucocompressive, , selective pressure func- , tional, and neutral zone impressions. However on the basis of over all results neutral zone seemed to have slightdenture16'20lective pressure impression technique (Fig. Herman B. Dumbrigue, DDM, a and Josephine F. Esquivel, DDM, MS a University of Florida College of Dentistry. obtain as much surface area to support the denture as physiologically acceptable. Through the … Please try again later. Although now seldom used for impression making, modifications of this method do have practical value as a technique for relin-ing intaglio denture surfaces. Green Brothers were the first to introduce the principle of muco compression during impression technique. This article describes a method of making impressions for tooth-mucosa–supported removable par- tial dentures using a single impression procedure. This concept combines the principles of both pressure & minimal pressure techniques. It combines the principles of both pressure and minimal pressure technique. Another type of impression technique is selective pressure technique in which stress bearing areas are compressed and stress relief areas are relieved such that both the advantages of muco static and muco compressive techniques are achieved. Among these, the selective impression technique has been widely used based on a histologic understanding of the supporting tissues that are anatomically favorable for with-standing pressure [5–8]. Materials used for disinfection of impressions are summarized in Table 2. the selective-pressure impression technique is most accepted. The selective-pressure impression technique com- bines aspects of both techniques, as pressure is applied to certain tissues while other areas are captured with minimal pressure. Technique:. Various techniques have been used to make complete denture impressions, including mucostatic, mucocompressive, selective pressure, functional, and neutral zone impressions. Keywords: Basal seat, bony trajectories, impression techniques, selective pressure How to cite this article: Singla S. Complete denture impression techniques: Evidence-based or philosophical. Based on thorough understanding of the anatomy & physiology of the basal seat & surrounding area. It combines the principles of both mucocompressive and minimal-pressure techniques, which were proposed by Carl O. Boucher [2]. Altered cast is also known as the . However, the viscoelastic rheological properties of impression materials, particularly the time-dependent viscoelastic changes in impression material immediately after tray seating, are unknown. The shortcomings of this principle gave rise to the mucostatic technique by Hary L. Page with high regard for tissue health. Volume … Mucostatic Impression technique. Since no pressure is applied, Tissue health is preserved.Hence, it is also known as Minimal pressure technique. The techniques used for making final impression The basic differences in techniques for final impressions can be resolved as those that record the soft tissues in a: Functional position (Closed mouth technique, Pressure technique) Rest position Nonpressure technique (Passive technique, Mucostatic technique). A good impression plays an important role in the successful treatment in cases of resorbed mandibular ridges where there is inadequate tissue to fulfil the requirement of retention, stability and support . Indian J Dent Res 2007;18:124-7: How to cite this URL: Singla S. Complete denture impression techniques: Evidence-based or philosophical. Selective- pressure theory. The border molding was done with low fusing impression compound (DPI Pinnacle) by sectional method. 2015 Oct;59(4):254-61. doi: 10.1016/j.jpor.2015.07.002. Half of the participants in each group were provided with dentures fabricated by selective pressure impression technique (subgroup SIT), and the other half were provided with dentures fabricated by mucostatic impression technique (subgroup MIT). Impression techniques can be broadly classified into Muco static, Muco compressive, and selective pressure technique. In the first theory, attempts are made to capture the intraoral tissues in a force‐loaded state. Purpose of altered cast- is an opportunity to create selective pressure impression of a distal extension and. Gainesville, Fla. Corrected Cast procedure. by selective pressure impression technique and others like retention, stability, tongue space and position of anterior teeth were found favorable in neutral zone concept (Table - 2). As the name signifies Muco static means no pressure is applied On the tissues while taking Impression. Advocated by carl ‘o’ Boucher in 1951. Final impression materials for complete denture construction include the following: zinc oxide eugenol pastes (ZOE), elastomeric impression materials and tissue conditioners [6] [7] . Selective pressure technique. Long term edentulism and use of … These results provide unique insight into the selective impression technique. selective‐pressure impressions [3–5]. The relief wax was removed and multiple holes were drilled in the “supporting tray (Figure 14).” Placement of multiple relief holes was done to ensure prevention of pressure build-up in the flabby area thereby leading to inadvertent tissue compression. The impression technique plays the substantial role. Rheological properties of elastomeric impression materials for selective pressure impression technique J Prosthodont Res. The above results suggest that making the final impression for the denture using the selective pressure technique, with consideration given to the pressure dynamic, may lead to a good outcome in terms of preservation of the alveolar ridge. It is important to thoroughly examine the patient’s mouth and select the most appropriate impression technique (1,6). Making accurate final impression for complete dentures is a multistage process that involves a preliminary impression, a customized final impression tray and a final border impression (4,5). Definite pressure impression technique for implant‐retained mandibular overdenture is associated with minimal denture deformation during function when compared with mucostatic and selective pressure techniques. Basal seat area can be divided on the basis of capacity to bear loads into; Selective Pressure Impression Technique The special tray fabricated on cast No. all cases. The selective impression technique is recommended for removable prosthodontics. 8 This principle of impression making is based on the belief that the mucosa over the ridge is best able to withstand pressure, whereas that covering the midline is thin and contains very little sub mucosal tissue. - I). The selective-pressure impression technique combines aspects of both techniques, as pressure is applied to certain tissues while other areas are captured with minimal pressure. mandibular distal extensio RPDS. DISCUSSION . Selective-pressure single impression procedure for tooth-mucosa–supported removable partial dentures. Part III investigates the specific distribution of pressure within the impression technique used for the clinical trial of Part IV, concluding that the pressure was distributed in a specific and useful way, which was clinically significant. The definitive impression was made with zinc oxide eugenol impression paste (DPI) standardizing the manipulation of materials (Fig. This feature is not available right now. Firm healthy mucosal covering over the ridge Mucostatic Impression Technique is indicated for options B,C and D. Half of the participants in each group were provided with dentures fabricated by selective pressure impression technique (subgroup SIT), and the other half were provided with dentures fabricated by mucostatic impression technique (subgroup MIT). 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