The impression technique plays the substantial role. 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. Although now seldom used for impression making, modifications of this method do have practical value as a technique for relin-ing intaglio denture surfaces. - I). Through the … The aim of the impression technique is to control the impression pressure by seeking and providing support in the stress-bearing impressions, including mucostatic mucocompressive, , selective pressure func- , tional, and neutral zone impressions. PURPOSE The selective impression technique is recommended for removable prosthodontics. #MCQ 19 - Selective Pressure Impression Technique is indicated in: A. As the name signifies Muco static means no pressure is applied On the tissues while taking Impression. 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). Rheological properties of elastomeric impression materials for selective pressure impression technique J Prosthodont Res. Selective- pressure theory. It combines the principles of both mucocompressive and minimal-pressure techniques, which were proposed by Carl O. Boucher [2]. DISCUSSION . This article describes a method of making impressions for tooth-mucosa–supported removable par- tial dentures using a single impression procedure. 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). However, the viscoelastic rheological properties of impression materials, particularly the time-dependent viscoelastic changes in impression material immediately after tray seating, are unknown. obtain as much surface area to support the denture as physiologically acceptable. 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. However on the basis of over all results neutral zone seemed to have slightdenture16'20lective pressure impression technique (Fig. 1 was checked for adaptation and extension and modified whenever required. Indian J Dent Res 2007;18:124-7: How to cite this URL: Singla S. Complete denture impression techniques: Evidence-based or philosophical. Long term edentulism and use of … Various techniques have been used to make complete denture impressions, including mucostatic, mucocompressive, selective pressure, functional, and neutral zone impressions. Please try again later. In the first theory, attempts are made to capture the intraoral tissues in a force‐loaded state. These results provide unique insight into the selective impression technique. Selective-pressure single impression procedure for tooth-mucosa–supported removable partial dentures. Materials used for disinfection of impressions are summarized in Table 2. Selective pressure technique. This concept combines the principles of both pressure & minimal pressure techniques. 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). 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. all cases. 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. This impression philosophy is credited to Boucher 5 and is based on a histologic understanding of the supporting tissues. Final impression materials for complete denture construction include the following: zinc oxide eugenol pastes (ZOE), elastomeric impression materials and tissue conditioners [6] [7] . 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). 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]. The techniques can be grouped into mucostatic, mucocompressive, selective pressure, functional, and neutral zone impression techniques. It is important to thoroughly examine the patient’s mouth and select the most appropriate impression technique (1,6). Gainesville, Fla. Final impression materials for complete denture construction include the following: zinc oxide eugenol pastes (ZOE), elastomeric impression materials and tissue conditioners [6] [7]. 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 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. Selective pressure theory: Advocated by Boucher in 1950, it combines the principles of both pressure and minimal pressure techniques. Keywords: Basal seat, bony trajectories, impression techniques, selective pressure How to cite this article: Singla S. Complete denture impression techniques: Evidence-based or philosophical. The definitive impression was made with zinc oxide eugenol impression paste (DPI) standardizing the manipulation of materials (Fig. Technique:. mandibular distal extensio RPDS. 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. Advocated by carl ‘o’ Boucher in 1951. Altered cast not needed in. Purpose of altered cast- is an opportunity to create selective pressure impression of a distal extension and. Selective Pressure Impression Technique The special tray fabricated on cast No. 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). The theory of mini-mal‐pressure employs the principles of mucostatics. The shortcomings of this principle gave rise to the mucostatic technique by Hary L. Page with high regard for tissue health. 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. 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. 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). Physiological impression techniques record the edentulous ridge in its functional form by placing a load on the impression tray during the impression procedure (McLean-Hindels method, functional reline impression technique, and fluid wax method). Corrected Cast procedure. 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). Herman B. Dumbrigue, DDM, a and Josephine F. Esquivel, DDM, MS a University of Florida College of Dentistry. This impression philosophy is credited to Boucher5 and is based on a histologic under- standing of the supporting tissues. Altered cast is also known as the . 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. The selective pressure technique is based on the selective pressure theory, which was proposed by Carl O. Boucher. Since no pressure is applied, Tissue health is preserved.Hence, it is also known as Minimal pressure technique. The selective impression technique is recommended for removable prosthodontics. Mucostatic Impression technique. ridge resorption, ranging from localized pressure to systemic factors (3). However, the viscoelastic rheological properties of impression materials, particularly the time-dependent viscoelastic changes in impression material immediately after tray seating, are unknown. Impression techniques can be broadly classified into Muco static, Muco compressive, and selective pressure 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 . The maxillary borders were recorded by selective pressure impression technique using green stick compound (Figure 13). The border molding was done with low fusing impression compound (DPI Pinnacle) by sectional method. 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. 2015 Oct;59(4):254-61. doi: 10.1016/j.jpor.2015.07.002. Altered cast is **most commonly needed for. This feature is not available right now. It combines the principles of both pressure and minimal pressure technique. Basal seat area can be divided on the basis of capacity to bear loads into; selective‐pressure impressions [3–5]. Based on thorough understanding of the anatomy & physiology of the basal seat & surrounding area. 45.6% used Selective pressure technique for making final impression, while 32.0% used Mucocompressive technique and 22.3% mucostatic technique. 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. 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. Green Brothers were the first to introduce the principle of muco compression during impression technique. the selective-pressure impression technique is most accepted. 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