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Designing and manufacturing of implantoprosthetic fixed suprastructures in edentulous patients on the basis of digital impressions

Malara P., Dobrzański L. B.

Archives of Materials Science and Engineering

2015

Vol. 76, nr 2

163--171

Purpose: The aim of the paper is to present the method of computer aided planning and manufacturing of a prosthetic suprastructure based on 6 implants in the totally edentulous mandible using digital intraoral scans. Design/methodology/approach: TThe method of computer aided planning and manufacturing of the implantoprosthetic restoration in the completely edentulous mandible using digital scans is presented on the example of a real clinical case of a patient with a significant deficit of alveolar bone qualified for the implant treatment. The abutments and the final fixed metal-ceramic bridge was designed and manufactured only on the basis of digital scanning of the intraoral supporting area instead of using traditional impression materials and trays. Findings: The method of computer-aided design and manufacturing of fixed restorations in the mandible using a digital scan of the supporting area is a powerful technique for improving the treatment process, through which the clinician and the patient may obtain satisfactory results in terms of functionality and aesthetics. Practical implications: The experience gained by the authors of the article in the technique of computer aided designing and manufacturing of fixed bridges on the basis of digital intraoral scans allows for the formulation of rules that must be followed at both clinical and laboratory stages. The properly performed scanning allows to obtain greater precision of the final restoration in terms of fit and occlusal accuracy. Originality/value: This paper presents an original methodology of obtaining information about intraoral configuration of the soft tissues and the position of the implants with the use of digital scanning. This method allows for designing and manufacturing of both the abutments and the final restoration without using impression materials which is especially useful in patients with significant bone loss and the gag reflex.

Badania doświadczalne oddziaływania protezy szkieletowej na zęby oporowe

Gralewski J., Grądzki R., Wojciechowski J., Bogusławski G.

Aktualne Problemy Biomechaniki

2010

z. 4

51--58

W pracy przedstawiono wyniki badań doświadczalnych pomiarów sił rekcji w zębach oporowych w odniesieniu do sił żucia działających na protezę. Na specjalnie skonstruowanym stanowisku badawczym złożonym z układu obciążającego tensometrycznego przetwornika siły poddano obciążeniu wybraną protezę i dokonano pomiaru sił przenoszonych przez zęby oporowe. Zastosowano dwa schematy obciążenia w dwóch wybranych miejscach na powierzchniach żujących uzupełnionych zębów w bliskim sąsiedztwie zęba oporowego. Analiza stanu obciążenia pozwoliła zmierzyć wartości sił reakcji pionowych oraz ocenić kierunki sił poziomych działających na zęby filarowe.

The experimental studies of measuring of reaction forces on abutment teeth relative to mastication forces acting on a removable partial denture were carried out. A specially constructed experimental system consists of stand and strain gauges equipment, In this system loading was applied to a selected denture and forces transmitted by abutment teeth were measured. Two loads were applied in two selected places on the masticatory surfaces of denture teeth adjacent to the abutment teeth. The results of the study are presented in a table. The analysis of the load allowed to measure values of vertical reaction forces and to make conclucion about directions of horizontal forces acting on abutment teeth.