Theories of impression making have evolved trough trial of a variety of materials and techniques. impression, a customized final impression tray and a final border impression (4,5). use of selective pressure or minimally displacive impression techniques should help to overcome some of these limitations. Even if selective pressure is the most accepted and followed impression philosophy; there are variations in designing of the custom tray for the same, as advocated by different academicians [3-14]. 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). definition of selective pressure impression technique. Technique:. Request full text. * Israel Defense Forces Center of Oral and Dental Medicine, Tel-Hashomer, Israel JLosi Lostsurgical nasal defects can be restored to a pleasing facial appearance with a nasal prosthesis. However, when the mucosa is easily displaced, the open-mouth selective pressure technique is preferable. Figure 21-1 Use of an existing Kennedy Class I removable partial denture base as a tray during a reline impression. The impression making in total denture treatment is of great importance, not only for denture retention and sta-bility but also for the mucosa status which should be kept and reflected without any distortions./ 4,5 / The aim of the authors is to present three methods for selective pressure ⦠Certain factors are better achieved by one technique and others by second method. Review article The objectives and principles of impression ⦠A dental impression is a negative imprint of hard (teeth) and soft tissues in the mouth from which a positive reproduction (cast or model) can be formed. With modified impression techniques, these ridges can be managed effectively without any additional clinical visits as compared to patients with normal edentulous ridges. The aim of the present study was to evaluate the effect of the functional impression technique with various impression materials on the surface characteristic of dental stone casts and their clinical effect on the retention of complete dentures. 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). The philosophy of the selective pressure technique is that certain areas of the maxilla and mandible are by nature better adapted for withstanding extra loads from the forces of mastication. Newer elastomeric materials for Learn vocabulary, terms, and more with flashcards, games, and other study tools. This article describes a selective-pressure impression technique for the edentulous maxilla that is intended to compensate for the polymerization shrinkage of heat-polymerized polymethyl methacrylate resin and provides improved palatal adaptation of the definitive denture base. the preference for the selective pressure impression was greater than that of the other two techniques. 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). Background: The accuracy of the final prosthesis is affected by the final impression technique and master cast production. It is made by placing an appropriate material in a stock or custom dental impression tray which is designed to roughly fit over the dental arches. 330987835 a-selective-pressure-impression 1. A major requirement for final impression of complete dentures ⦠A primary mandibular cast was made using dental plaster (Dentico, Neelkanth, India). Methods: In this study, two types of polyvinylsiloxane elastomers, one type of polyether elastomer and one type of alginate impression material were used. Complete denture fabrication in clinically compromised situations such as flabby ridges is a challenging task for the clinician. However none of these techniques has been designated as the âtime bestâ for a particular patient though selective pressure technique has got much attention in the literature. Technique. However, the viscoelastic rheological properties of impression materials, particularly the time-dependent viscoelastic changes in impression material immediately after tray seating, are unknown. 45.6% used Selective pressure technique for making final impression, while 32.0% used Mucocompressive technique and 22.3% mucostatic technique. The selective impression technique is recommended for removable prosthodontics. Purpose: The purpose of this study is to compare the pressure dynamics in the trays caused by differences in the various impression materials and in the thickness of the relief provided for the trays. PURPOSE The selective impression technique is recommended for removable prosthodontics. Relating this to complete denture impression technique, we have been provided with a set of philosophies - no pressure, minimal pressure, definite pressure and selective pressure. The border molding was done with low fusing A selective-pressure impression technique for the edentulous maxilla Jacqueline P. Duncan, DMD, MDSc,a Sangeetha Raghavendra, DMD, MDSc,b and Thomas D. Taylor, DDS, MSDc University of Connecticut School of Dental Medicine, Farmington, Conn This article describes a selective-pressure impression technique for the edentulous maxilla that is ⦠The objective of this study is to clarify the viscoelastic rheological properties of impression materials ⦠Standard mucocompressive impression techniques are likely to result in an unretentive and unstable denture as the denture constructed on a model of the flabby tissue in a distorted state. In this study selective pressure impression technique and neutral zone have been compared. Selective-pressure impression technique for nasal prostheses Arie Shifman, D.M.D. Code of practice is dangerous and ever-changing in today's world. - Areas of the denture bearing tissue best able to tolerate load and provide support are impressed under increased pressure or functional load. The selective pressure maxillary impression: A review of the techniques and presentation of an alternate custom tray design Sanath Shetty, P Venkat Ratna Nag, Kamalakanth K Shenoy Department of Prosthodontics including Crown and Bridge and Implantology, Yenepoya Dental College, Derlakatte, Mangalore, Karnataka, India Accurate impressioning of these tissues plays a major role in ensuring a well-fitting prosthesis. Both techniques should guard against framework movement during the impression procedure. Selective pressure theory: Advocated by Boucher in 1950, it combines the principles of both pressure and minimal pressure techniques. neutral zone impression technique. It is important to thoroughly examine the patientâs mouth and select the most appropriate impression technique (1,6). The selective pressure maxillary impression: A review of the techniques and presentation of an alternate custom tray design Sanath Shetty, P. Venkat Ratna Nag, Kamalakanth K. Shenoy Department of Prosthodontics including Crown and Bridge and Implantology, Yenepoya Dental College, Derlakatte, Mangalore, Karnataka, India For correspondence The use of selective pressure or minimally displaced impression techniques should ⦠Views 0. 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 technique. 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. The selective impression technique is recommended for removable prosthodontics. This article describes a selective-pressure impression technique for the edentulous maxilla that is intended to compensate for the polymerization shrinkage of heat-polymerized polymethyl methacrylate resin and provides improved palatal adaptation of the definitive denture base. Final Impression using selective pressure impression technique Selective pressure impression technique.6-9 Massadâs impression technique.5,10-14 Functional impression technique.15-17 Selective Pressure Impression Technique The special tray fabricated on cast No. However, the viscoelastic rheological properties of impression materials, particularly the time-dependent viscoelastic changes in impression material immediately after tray seating, are unknown. 1 was checked for adaptation and extension and modified whenever required. The work of this Thesis introduces dentists to a successful impression technique and provides them with clear, clinically relevant and useful evidence for that impression technique. Patientâs previous denture was used for making primary impression with irreversible hydrocolloid impression material (Imprint, DPI, Mumbai). However, the viscoelastic rheological properties of impression materials, particularly the time-dependent viscoelastic changes in impression material immediately after tray seating, are unknown. Materials used for disinfection of impressions are summarized in Table 2. Effect of mucostatic and selective pressure impression techniques on residual ridge resorption in individuals with different bone mineral densities: A prospective clinical pilot study. Review Article 3 - Free download as PDF File (.pdf), Text File (.txt) or read online for free. 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