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PubMed1996

The acquisition and validation of removable partial denture design knowledge. I. Methodology and overview.

The authors report on the eliciting of the partial denture design expertise of teachers of prosthetic dentistry. Their approach was to identify 125 design rules and then to sample expert reaction by surveying 10 experts individually and by surveying the prosthetic departments in all 17 dental schools in the British Isles. The surveys achieved a return of 100% and revealed an unsuspected consensus concerning the rules. A majority of schools were in agreement on whether or not 111 (89%) of the rules could be supported. This design expertise will be disseminated through RaPiD, a knowledge-based assistant for the design of removable partial dentures. It is expected that by incorporating into this design assistant rules which have been shown to be widely supported, the acceptability and usefulness of RaPiD for clinical education and practice will be increased.

Artificial Intelligence↗
PubMed2001

[Development and applications of a computer aided complete denture design system].

OBJECTIVE: The purpose of this study was to develop a practical CAD/CAM system with knowledge databases for complete denture. METHODS: A three-dimensional coordinate measuring machine (3DCMM) was used to collect three-dimensional information of edentulous models and bite plates and the mathematics model of complete denture was established using B-Spline method. This system was established by seting eight functional models: the measuring model, the converting data model, the constructing curve-surface model, the producing base and the editing model, the arranging artificial and the editing model, the outputting income model, the imitating dynamic model and the managing model. RESULTS: (1) The soft and hard system of a computer aided complete denture design (CACDD) was established, including 3DCMM, 8 functional models and databases. (2) A CACDD system and the three-dimensional demonstration were completed. CONCLUSION: This system lay down the foundation for setting up the computer aided complete denture design/manufacturing system.

Computer-Aided Design↗
PubMed1994

Evolution of removable partial denture design.

This is a brief overview of the progress of design philosophies of removable partial dentures. It begins in 1711 with the first published description of a removable partial denture prosthesis and continues, with discussion of the most significant discoveries, through 1990.

Dental Clasps↗
PubMed1995

A study of partial denture designs produced by an alumni group of dentists in health service practice.

Seventy-three dental surgeons working in general dental practice, all members of an alumni group, were given identical casts and produced designs for a mandibular partial denture. The designs were subsequently analysed and the dentists' skills in communicating their design intentions to technicians were also assessed. In this instance a preference for simple straightforward designs was demonstrated with a tendency to favour stereotype responses to detailed design challenges, which were not necessarily apposite. More recent graduates produced designs which were more likely to be understood by the technician.

Communication↗
PubMed1978

A survey of partial denture design in general dental practice.

The objects of this investigation were to discover the methods by which general dental practitioners communicated partial denture designs to dental laboratories and to ascertain the extent to which certain design criteria were being followed. The results of the survey showed that the responsibility for design appeared to be largely delegated to the technician. In most instances cobalt-chromium dentures were produced which would assist in maintaining oral health; however, this was not the case with acrylic dentures.

Acrylic Resins↗
PubMed1994

Rotational path partial denture design: a 10-year clinical follow-up--Part II.

A review of the rotational path removable partial denture design concept has been presented. The rigid direct retainers used in these designs satisfy the basic requirements of clasp designs. The reported results of a survey of the members of The Academy of Prosthodontics may provide insight into the reasons for reluctance on the part of some practitioners to use the concept more often when indicated. Possible reasons include the following: lack of sufficient understanding of the concept, difficulty in obtaining knowledgeable laboratory support, absence of documented evidence of long-term clinical success, and a general lack of confidence in the efficacy of the procedure as described in the literature. This article presents references that are available to improve the understanding of technicians and dentists with regard to the rotational path concept. In addition, several patients followed up for 10 or more years demonstrated long-term clinical success.

Attitude of Health Personnel↗
PubMed1989

Microcomputer-aided removable partial denture design: the next evolution.

A microcomputer-based program for the design of removable partial dentures has applications in dental education and the clinical practice of dentistry. The program requires a Macintosh computer with a minimum configuration of one megabyte of random access memory and a hard disk drive with a HyperCard program. The instructional design uses an interactive, branching user interface to conduct a search of removable partial design data. The screen design is based on a dental laboratory work authorization, with graphic representations of partially edentulous dental arches and textual information that can be browsed in a nonlinear manner by the user. Approximately 160 removable partial denture designs are provided in the program, as well as the ability to modify the drawings and text to reflect various other clinical situations and to print the work authorization for submission to the dental laboratory.

Computer Systems↗
PubMed1989

Removable partial denture design and fabrication survey of the prosthodontic specialist.

In an effort to better understand and define the present standard of practice for removable partial denture design and fabrication, a questionnaire was prepared and distributed to prosthodontic specialists and graduate students or residents attending the American College of Prosthodontists annual meeting in 1987. The survey was designed to determine the philosophies and techniques used by prosthodontic specialists in treatment involving the removable partial denture. There were 195 questionnaires completed and used in determining the results. The results indicate areas of general agreement. Comparison with other data shows areas of controversy, but prosthodontists tend to follow techniques and philosophies similar to what is taught in most U.S. dental schools and what is recommended by the Academy of Denture Prosthetics.

Adult↗
PubMed1995

Removable partial denture design habits in general dental practice in Sweden.

An investigation was made concerning Swedish general dental practitioners' habits in removable partial denture design and their opinion of the undergraduate training programme in this matter. The investigation showed that many dentists failed to provide adequate prescriptions and that they relied heavily on the dental technician for partial dental design. A clear majority of the participants, educated at Umea dental school, considered the undergraduate training programme to be adequate, whilst a similar percentage educated at Gothenburg dental school was dissatisfied. The faculties in Stockholm and Malmo were placed between Umea and Gothenburg in this respect. The majority of the participants in this survey declared that the opportunity to attend small group postgraduate courses in the subject was desirable. A prerequisite for dentists to have control of the treatment they are responsible for, is that they at least have the necessary knowledge. This knowledge may have to be achieved after qualification instead of during their undergraduate training.

Attitude of Health Personnel↗
PubMed1991

A two part hinged partial denture design for lower Kennedy Class 4 cases.

It is often difficult to provide patients who have lost lower anterior teeth with a retentive and aesthetic restoration, particularly if the molar and premolar teeth are lingually tilted. A two part hinged denture fully engaging all lingual undercuts for retention provides a useful extension to recognised partial denture design practice.

Denture Design↗
PubMed1984

Studies of biologic parameters for denture design. Part II: Comparison of masseter muscle activity, masticatory performance, and salivary secretion rates between denture and natural dentition groups.

Bilateral masseter muscle activities exerted during masticatory and salivary secretion rate tests of a group of 18 denture wearers were compared with a group of eight persons with 26 or more natural teeth. Denture wearers applied 22% to 39% of the muscle force applied by the ND group to chew peanuts or carrots and showed markedly lower masticatory performances. The average muscle activity was higher for chewing peanuts than carrots in the ND group but was similar for both test foods in the AD group. Motor discrimination seems to be intact in denture wearers, but their inability to tolerate high masticatory pressures may prevent them from exerting discriminatory forces comparable to those applied by persons with natural dentition when chewing relatively tough foods of varying hardness. The results indicate that the reduced muscle force applied by denture wearers is another important factor that contributes to their diminished chewing ability. Even though the denture wearers were older and applied less muscle activity during chewing, they produced slightly higher rates of stimulated parotid saliva than the ND group. This supports our previous findings and further indicates that the mucosal stimulation of dentures compensates for decreased muscle activity and absence of periodontal receptor stimulation for producing saliva in healthy denture wearers.

Adult↗