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Stress distribution in anchoring regions of posts cooperating with overdentures

100%

Chladek W. , Chladek G. , Krukowska J. , Lipski T.

Acta of Bioengineering and Biomechanics

2005

tom Vol. 7, no. 1

35-45

The paper presents the results of model research of mechanical compatibility of selected overdenture structures. The tests based on finite elements method were conducted on flat models reflecting the areas of posts anchoring m a sagittal piane. The reference point was the structure of a prosthesis seated on ball-and-socket joints secured in tooth roots. As altemative solutions, dentures placed on two cylindrical implants supporting ball-and-socket joints were compared with a denture attached to a joint which consisted of a straight axis bar and an elastic clip as well as with a denture supported by a joint of elevated retention, built of a doubly bent axis bar and three elastic bar clips. Taking advantage of the MES Algor program functions, the diverse materiał structures of the systems investigated were modelled. Next. the reduced stresses and principal maximum stresses generated m osseous tissues, in the implants anchoring area. were determined. The value of the mechamcal stimulator decisive to the osseous tissue remodelling was assumed as au evaluatiou criterion. It was assumed that making use of patient's own tooth roots to attach implants IS an optimal solution which, in terms of mechanics, IS practically identical to the alveolodental ligament of a healthy tooth. The application of the other methods of implanted prosthesis attachment always creates a risk of undesirable changes, mostly in the upper area of post insertion into the osseous tissue. The least favourably, in the light of stresses comparison, looks the joint of a doubly refracted axis, where the probability of adverse changes of the osseous tissue in a short time is high. This indicates the necessity to carry on words in order to improve this solution characterized by good retention.

Precyzyjne elementy retencyjne stosowane w protezach overdentures w żuchwie wspartych na śródkostnych wszczepach dentystycznych

67%

Błądek–Grzelczak K. , Sporny S.

Folia Medica Lodziensia

2012

tom 39

nr 1

51-69

Many years of research on implants, safer surgical procedures and modern laboratory techniques have resulted in recent years, in the widespread use of overdentures supported by endosteal implants. The aim of this study is to review the retention elements available for use in mandibular overdentures supported by implants. The paper presents a brief description of the most popular precision retentive elements, such as: ball attachments, bars, magnets, telescopic crowns. The advantages and disadvantages of different prosthetic solutions have been examined. High wearing comfort of overdentures prostheses supported on implants and a significant improvement of quality of life for patients using this type of prosthesis have been highlighted.

Wieloletnie badania nad wszczepami, coraz bezpieczniejsze procedury chirurgiczne i nowoczesne techniki laboratoryjne spowodowały w ostatnich latach upowszechnienie się protez nakładkowych wspartych na wszczepach śródkostnych. Celem pracy jest przegląd typów precyzyjnych elementów retencyjnych stosowanych w protezach overdentures wspartych na śródkostnych wszczepach dentystycznych. Przedstawiono krótką charakterystykę najczęściej stosowanych elementów retencyjnych, takich jak: zaczepy kulkowe, belki, magnesy i korony teleskopowe. Omówiono wady i zalety poszczególnych rozwiązań protetycznych. Zwrócono uwagę na wysoki komfort noszenia protez overdentures wspartych na wszczepach i znaczną poprawę jakości życia pacjentów użytkujących ten typ protez.