acrylic partial denture design

Interim partial dentures are removable devices made from acrylic denture base and consists of artificial teeth. B, The flat ridge will provide good support, poor stability. As was stated in Chapter 7, the location of the rest, the design of the minor connector as it relates to its corresponding guiding plane, and the location of the retentive arm are all factors that influence how a clasp system functions. A fluid mouth-temperature wax or any of the readily flowing impression materials (rubber base, the silicones, or the polyethers in an individual, corrected tray) may be employed for registering the supporting form. Major support for denture bases must come from residual ridges, tooth support from occlusal rests being effective only at the anterior portion of each base. Figure 10-2 Distortion of tissues over the edentulous ridge will be approximately 500 µm under 4 newtons of force, whereas abutment teeth will demonstrate approximately 20 µm of intrusion under the same load. This connection is facilitated by designing and locating major and minor connectors in compliance with the basic principles and concepts presented in Chapter 5. D, Displaceable tissue on the ridge will provide poor support and poor stability. What Are Flexible Dentures? Recording the anatomic form of both teeth and supporting tissues will result in inadequate support for the distal extension base. The design of the partial denture framework should be systematically developed and outlined on an accurate diagnostic cast based on the following prosthesis concepts: where the prosthesis is supported, how the support is connected, how the prosthesis is retained, how the retention and support are connected, and how edentulous base support is connected. Such an effect is variable and is based on the nature of the opposing occlusion, because the forces of occlusion differ between natural teeth, removable partial dentures, and complete dentures. The most common acrylic denture material is plastic. In an entirely tooth-supported partial denture, the most ideal location for the support units (rests) is on prepared rest seats on the occlusal, cingulum, or incisal surface of the abutment adjacent to each edentulous space (see Figure 10-1, B). Therefore, occlusal relationships at maximum intercuspation should be broadly dissipated to the supporting units. Each of these two types of cast clasps has its advantages and disadvantages. As was stated in, Removable Partial Denture Considerations in Maxillofacial Prosthetics, Chapter 16: Support for the Distal Extension Denture Base, 25: Considerations for the Use of Dental Implants With Removable Partial Dentures, 2: Considerations for Managing Partial Tooth Loss: Tooth Replacements From the Patient Perspective, 22: Repairs and Additions to Removable Partial Dentures, McCracken's Removable Partial Prosthodontics 12e. An acrylic RPD consist of an acrylic resin denture base, artificial teeth, and wrought wire clasp or even cast clasps. Acrylic-resin is generally used as a base material for distal extension bases. A patient’s specific needs and anatomy dictate the design of the partial denture and every effort is made to construct a self-cleansing partial denture that preserves the remaining teeth and oral tissues. 8 found similar results in a survey in UK, where 43% were cases of acrylic prosthesis; Pun et al. Removable partial dentures usually consist of replacement teeth attached to pink or gum-colored plastic bases. Denture base areas adjacent to abutment teeth are primarily tooth supported. ºIظ´. The Class III partial denture, on the other hand, which is entirely tooth supported, does not require relining except when it is advisable to eliminate an unhygienic, unesthetic, or uncomfortable condition resulting from loss of tissue contact. At the appointment your dentist will insert the previously manufactured custom all-acrylic partial denture. On the other hand, a clasp used in conjunction with a mesial rest may not transmit as much stress to the abutment tooth because of the reduction in leverage forces that results from a change in the fulcrum position. A removable partial denture usually has replacement teeth attached to a metal or acrylic (plastic) base that matches the color of your gums. that is supported in part by natural teeth, dental implant supported crowns, abutments, or other fixed partial dentures and /or the mucosa; usage: a partial denture should be described as a fixed partial denture or removable partial denture based on the patient’s capability to remove or not remove the prosthesis. Figure 10-4 1, Maximum contact of the proximal plate minor connector with the guiding plane produces a more horizontal distribution of stress to the abutment teeth. Figure 10-1 A, Kennedy Class I partially edentulous arch. The length and contour of the residual ridge significantly influence the amount of available support and stability (Figure 10-3). Opposing tooth positions that apply forces outside the primary support of the prosthesis can introduce leverage forces that act to dislodge the prosthesis. Make two casts 11. Draw design on 2nd cast 12. They are designed for the filler period after you get your teeth removed and before you get your permanent denture. In evaluating the potential support that an abutment tooth can provide, consideration should be given to (1) periodontal health; (2) crown and root morphologies; (3) crown-to-root ratio; (4) bone index area (how tooth has responded to previous stress); (5) location of the tooth in the arch; (6) relationship of the tooth to other support units (length of edentulous span); and (7) the opposing dentition. Designed to be temporary, you shouldn’t wear them for longer than a few months. 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