Manual Techniques in Complete Denture Technology

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Techniques in Complete Denture Technology - T.Johnson/ J. Duncan
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In the s, this was superseded by acrylic resin: polymethylmethacrylate PMMA. Although significant advances have been made in material formulations and laboratory technique, the overall physical and mechanical properties of modern PMMA formulations fail to fulfill all the ideal requirements as described by Anusavice.

The laboratory process of denture fabrication has not deviated significantly since the s.

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The most significant advances have been in the delivery of the mixed PMMA dough. Dentures processed via injection-molded systems now have the capability of producing greater accuracy and dimensional stability than those produced via standard compression techniques.

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This system replaces the lost wax-technique. Some of its advantages include not using monomer methyl, ethyl, butyl, or propyl methacrylate ; elimination of flasking and packing; short processing times; and less than half of the volumetric curing shrinkage when compared to conventional PMMA. Consequently, Eclipse can fabricate a separate denture base in either clear or tissue-colored material, which can then be used with conventional wax-trial denture set-ups and PMMA materials to become an integral part of the final prosthesis.

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Also, as with most new technologies, there is a learning curve for both the dental technician and dentist using these materials. Clinical techniques involved in denture fabrication have not changed significantly over the years. Although specific techniques may vary from operator to operator, the overall goals remain the same: denture support, retention, and stability. In order to achieve satisfactory support from the overlaying prostheses, accurate impression techniques that capture the underlying bone and soft tissues are required.

Retention is a function of capturing passive peripheral extensions affording a peripheral seal. Stability is a consequence of a satisfactory occlusal scheme and maxillo-mandibular relations.

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  7. There are three basic concepts for impression-making, based on pressure applied to various anatomical areas: mucostatic impression technique minimal pressure technique ; functional impression technique pressure technique ; and semi-functional impression technique selective-pressure technique. Of these techniques, the most popular method taught in the undergraduate dental setting is the selective-pressure technique. This approach attempts to place most stress on those areas of the maxilla and mandible that can best resist functional forces of the denture bases.

    Conventional clinical appointment sequence in complete denture fabrication is as follows:.

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    The impression techniques described above all subscribe to the use of custom impression trays. These are constructed on primary casts generated from initial impressions taken during the first clinical appointment. The resources used include either auto- or light-polymerized resin tray materials. The tray material can be manipulated, molded, and trimmed once heated and customized intraorally or on a cast generated from an initial impression.

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    5. Once adjusted, a secondary impression is taken using border-molding techniques and materials familiar to the operator. Although these products and associated techniques have the potential to reduce overall clinical time by combining the first three visits in the conventional sequence of clinical appointments, 12 there is no literature to support or disprove the efficacy of treatment outcomes with this approach.

      Along with advances in denture base materials and processing techniques, manufacturers continue to develop and introduce tooth lines with improved esthetics and mechanical properties. These teeth lines are manufactured with a layering process that uses a triple-cross-linked PMMA resin and microfilled materials for improved wear resistance. Other manufacturers have introduced nano-hybrid composite technology into the tooth manufacturing process. These teeth will bond to PMMA base materials without any special bonding agent.

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      Denture esthetics has essentially involved a subjective approach, employing long-standing techniques and principles to help reach a satisfactory esthetic and functional outcome for the patient and dentist. Particularly, this is the case with the clinical arrangement of the teeth in the trial-denture base. Although there have been no significant advances in recent years, such principles have been well-described elsewhere.

      Posterior tooth selection and arrangement varies depending on prescribed theories and operator preference. The two most popular posterior occlusal scheme relationships are conventional buccalized occlusion and lingualized occlusion. Posterior lingualized occlusion is not a recent concept. The maxillary palatal cusp alone is placed in contact with the opposing teeth, providing support and function. Purported benefits of lingualized posterior occlusal schemes include improved food bolus penetration and the potential to reduce the vertical forces placed on the residual alveolar ridges.

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      Patients reported no significant differences in chewing capability and overall comfort and satisfaction between lingualized occlusion teeth and anatomic teeth. Regardless of the lack of clinical studies to support lingualized over buccalized occlusal schemes, lingualized occlusal concepts have been gaining recent popularity as evidenced by manufacturers devoting new posterior tooth mold lines specifically to this occlusal scheme.

      However, up until recently, this has not been the case in the removable field. With this approach, teeth are produced with high levels of accuracy and uniformity, making it possible to produce precisely matched pairs of teeth. The jig system allows for anatomically correct positioning of the posterior teeth relative to each other, utilizing specially customized posterior tooth impression blocks.

      Border Molding for Complete Dentures

      Advantages include standardization of posterior tooth set-ups, accurate occlusal arrangement, and time-savings in the set-up process. A discussion of updates in removable complete denture therapy would not be complete without referencing dental implant therapy. In fact, it is the author's opinion that complete denture therapy is the gateway to implant therapy—an ever-growing treatment modality in clinical dentistry. Chapter 5: Maxillo-facial Technology. Chapter 6: Occlusion. Copyright Todos los derechos reservados. Mis pedidos. Description This practical clinical manual focuses on the discipline of complete denture technology.

      Lingualised occlusions. Setting up the teeth for a stable denture.

      Techniques In Complete Denture Technology

      Staining the PMMA base. Neutral zone denture techniques. Precision attachments — crown and bridgework and partial dentures combined. Next Application Deadline is Jul Apply Now. Location Main Campus. Credit Hours Program Stats. Upcoming Program Events. Oct