Researchers Submit Patent Application, “One Visit Denture”, for Approval

By a News Reporter-Staff News Editor at Politics & Government Week -- From Washington, D.C., VerticalNews journalists report that a patent application by the inventor WALLACE, Lawrence Norman (Carmel Valley, CA), filed on November 26, 2014, was made available online on June 4, 2015.

No assignee for this patent application has been made.

News editors obtained the following quote from the background information supplied by the inventors: "The present invention relates to medical devices and, more specifically to dentures and a method for fabricating a denture in one visit.

"Many patients require dentures but do not have easy access to dental care, either because of monetary limitations or geographical limitations. Many patients are older and live in nursing homes or assisted living facilities, making it difficult for those patients to go to the dentist's office once, let alone visit the office four to five times as required for conventional dentures. Additionally, conventional dentures are expensive and not fully covered by insurance and not covered at all by Medicare. Nonetheless, functional dentures are important in maintaining general health, decreasing the incidence of chronic disease, lowering overall medical costs while offering a higher quality of life and sense of self-esteem.

"Missing teeth have a variety of implications, including impairment of mastication, speech defects, swallowing disorders, nutrition intake, distorted facial contour, and overall physical and emotional discomfort. Headaches and other illnesses are often related to missing teeth. Replacement of missing teeth is therefore a necessity that is significant to emotional and physical health and well-being.

"Conventional dentures are fabricated in dental offices and typically require four to five visits by the patient. During the first visit at the dentist's office, a preliminary impression is taken to make a custom mold of the mouth. That mold may be sent to the laboratory to make custom impression trays. During the second visit to the dentist, the custom impression trays are checked and adjusted and the dentist also takes final impressions. The corresponding laboratory procedures involve creating a cast master mold, a stabilized based plate, and a wax occlusal rim. During the third visit to the dentist, the dentist determines the maxillo-mandibular relation, selects the teeth for the denture, and takes a bite registration. The corresponding laboratory work involves setting the anterior and posterior teeth, thus completing a wax denture for the patient to try. During the fourth visit to the dentist, the dentist checks the aesthetics and functionality of the wax up dentures, checks the occlusal and vertical dimension, and makes any required corrections. The dentures are sent to the lab to be processed and finished. The fifth visit to the dentist involves the delivery of the dentures, a final check for fit and then, finally, the dentures are given to the patient for home use.

"One article suggests that the process of fabricating a denture can be accomplished in three appointments. This procedure is described in the article entitled The Three Appointment Denture Technique as Presented by Robert H. Griffiths, D. D. S. and Don Kaylor, C. D. T., printed by the Council on Prosthetic Services and Dental Laboratory Relations in May 1979, in a pamphlet entitled Compilation of Reduced Fee Denture Techniques. In the first, 45 minute appointment, the dentist conducts an examination of the patient which involves examining the tissue and structures, taking a panoramic radiograph, discussing patient history, selecting impression trays, taking facial measurements, determining the tentative vertical and centric relationship, and selecting the teeth and teeth shades. Stabilized base plates should then be received from the lab so that a wax-up can occur. During the second, 20 minute appointment, a preliminary fit analysis of the wax setup occurs and necessary adjustments are made. Between the second and third appointments, the lab must complete the final set of dentures. The third, 20 minute appointment, involves checking the final set of dentures and instructing the patient on how to use the dentures.

"Most notably, the proposed three visit procedure only results in a cost saving when the dentist office is able to work closely with the dental laboratory. Additionally, the procedure still requires making a wax model for the first try-in. Making a wax setup requires a significant amount of time and expense.

"Sekendur, U.S. Pat. No. 6,079,981, discloses a method for making a customized denture from standard sized segments of prefabricated prosthetic teeth which may be joined and adjusted to fit an individual's mouth. Each prosthetic tooth is bonded to a prosthetic gum segment. The gum segments of each prosthetic tooth are joined to form the gum line. The prosthetic teeth are first selected and then evaluated in the patient's mouth by the dentist, conformed in the mouth or on a model of the mouth to form the denture, and finally cured to form the finished denture.

"Saitoh, et. al., U.S. Pat. No. 5,304,062, discloses a prosthetic denture precursor and a method for making the same. The prosthetic denture precursor comprises at least one artificial tooth and a photopolymerizable denture base material which holds the root portion of the artificial tooth. The method of making the prosthetic denture precursor does not require making a wax denture, as the photopolymerizable denture base can be deformed prior to exposure to light. After the tooth is adjusted to a dentally operative position, the base is irreversibly hardened by exposure to light.

"Hazar, et al., U.S. Pat. No. 4,583,947, discloses a custom denture and method for making the same. A standard-sized base is selected and fitted with artificial teeth. The teeth are fit into the base and secured by a U-shaped appliance which stabilizes the teeth in their relative positions in the sockets. To determine the appropriate standard base size to select, the dentist takes an impression of the patient's oral cavity. From the impression, upper and lower models are cast, allowing the dentist to select the most appropriate standard-sized base. The bases are then conformed to the surface contours using the casted models and finally, the artificial teeth are secured.

"Other methods of making custom dentures have failed to fully address the issue of being able to produce the dental device in a single visit and doing so at a reduced cost, such as may be at the level of Medicaid reimbursement. Thus, patients who do not have easy access to a dental office and those who cannot afford the procedure are precluded from dental treatment which is necessary for physical and emotional health. Furthermore, many dentists choose not to make dentures because the process requiring multiple visits is not profitable. Other methods also require the use of an off-site dental laboratory, adding to time and cost.

"It would therefore be desirable to provide a custom denture that overcomes the shortcomings and limitations of conventional dentures and the conventional methods for making dentures"

As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventor's summary information for this patent application: "To address these and other needs, and in view of its purposes, one aspect of the present invention provides a pre-formed denture template with teeth in place, and which requires only one step and only one sitting, to be made into a finalized, customized denture. The sitting may be a visit to a dental office according to one exemplary embodiment.

"According to one aspect, the invention provides a method for forming a denture for a patient in a single dental office visit. The method comprises providing a plurality of denture templates having different sizes, each having been pre-formed to a pre-formed shape and comprising a base acrylic portion with prosthetic teeth adjoined thereto, selecting a first dental template of the plurality of dental templates that has a size generally corresponding to a size of the patient's edentulous alveolar ridge but does not fit conformably, i.e., exactly thereto. The method further comprises adding an impression material which may be a reline or other viscous material, to the first dental template and positioning the first dental template on the patient's edentulous alveolar ridge to mold the impression material to conform to the contours of the patient's edentulous alveolar ridge and vestibule. The method further comprises allowing the impression material to solidify to produce a customized, rigid or semi-rigid molded portion thereby forming a denture comprised of the prosthetic teeth, the base acrylic portion and the solidified molded portion which includes a custom lining. The steps of selecting, adding, positioning and allowing may advantageously take place in one visit.

"According to another aspect, the present invention provides a denture formed according to such method and including two acrylic sections. A template is formed of a first acrylic portion and includes teeth coupled directly to the first acrylic portion. A second acrylic portion is conterminous with the first acrylic portion and conforms to a patient's edentulous alveolar ridge and may be rigid or semi-rigid.

"According to another aspect, the invention provides a denture comprising teeth and a denture base consisting of two acrylic portions including a template formed of a first acrylic portion and coupled directly to the teeth and a second acrylic portion adjacent and conterminous with the first acrylic portion and being conformed to a patient's edentulous alveolar ridge.

BRIEF DESCRIPTION OF THE DRAWINGS

"The present invention is best understood from the following detailed description when read in conjunction with the accompanying drawings. It is emphasized that, according to common practice, the various features of the drawings are not necessarily to scale. On the contrary, the dimensions of the various features may be arbitrarily expanded or reduced for clarity. Like numerals denote like features throughout the specification and drawings.

"FIG. 1 is a flowchart illustrating the process for producing a denture in one office visit in accordance with the invention.

"FIGS. 2A-2D illustrate an exemplary maxillary denture template in accordance with the present invention. FIG. 2A is a perspective view of the exemplary maxillary denture template. FIG. 2B is a side view of the exemplary maxillary denture template. FIG. 2C is a front view of the exemplary maxillary denture template. FIG. 2D is a cross-sectional view of the exemplary maxillary denture template.

"FIG. 3 is a perspective view of an exemplary mandibular denture template in accordance with the present invention.

"FIG. 4 is a perspective view illustrating a viscous material added to the mandibular denture template shown in FIG. 3.

"FIGS. 5A to 5D correspond to FIGS. 2A-2D and illustrate an exemplary maxillary denture formed from the exemplary maxillary denture template of FIGS. 2A-2D in accordance with the present invention. FIG. 5A is a perspective view of the exemplary maxillary denture formed in accordance with the present invention. FIG. 5B is a side view of the exemplary maxillary denture formed in accordance with the present invention. FIG. 5C is a front view of the exemplary maxillary denture and FIG. 5D is a cross-sectional view of the exemplary maxillary denture formed in accordance with the present invention.

"FIG. 6 illustrates a set of exemplary maxillary-mandibular dentures being worn by a patient."

For additional information on this patent application, see: WALLACE, Lawrence Norman. One Visit Denture. Filed November 26, 2014 and posted June 4, 2015. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=2463&p=50&f=G&l=50&d=PG01&S1=20150528.PD.&OS=PD/20150528&RS=PD/20150528

Keywords for this news article include: Patents, Dentistry, Legal Issues.

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