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At least 595 records · Page 33Linked to original sources
PubMed1990

[Mastication rehabilitation via dysgnathia surgery and simultaneous implantation].

Within the last 2 years 26 endosseous implants have been used in combination with orthognathic surgery in the maxilla and mandible. The results show, that endosseous implants can be used simultaneously with orthognathic surgery. This helps to treat dysfunctions often seen in partially edentulous patients that undergo orthognathic surgery and at the same time reduce the risk of relapse by achieving stable occlusion.

Dental Implantation, Endosseous↗
PubMed1990

Force-time breakage characteristics of food during simulated initial phase of mastication.

With the long range goal of gaining an insight into force control and muscle recruitment, it seems necessary to understand the task given to the masticatory apparatus. The purpose of this study was to characterize food breakage properties, and to study the influence of different compression speeds and occlusal morphologies on the categorized food properties. Experiments were carried out by means of a standard Instron instrument, modified with a switching relay. A stylus with 45 degree angulation and an opposing copperplated lower arch of either human or Macaca fascicularis were used for approximation of the natural situation. Crosshead speeds of 2 and 5 cm/min were selected. For future application, monkey chow was chosen as the testfood. Six parameters were defined to categorize food properties, which were initial breakage force (IBF), initial force buildup (IFB), maximum breakage force (MBF), breakage point (BP), temporal location of MBF (TL), and total compression time (TCT). The results showed that the force-time breakage characteristics of monkey chow were affected by different compression speeds in some aspects. However, this was not the case for the alteration of occlusal morphology.

Animal Feed↗
PubMed1990

[A study of occlusion phase during mastication in complete denture patients].

Author examined the chewing patterns of 10 complete denture wearers with LED mandibular tracking device, and analyzed the average cycle time, average occlusion time and the ratio of average time/average cycle time during chewing occlusion various test foods-standardized carrot and ham, the results were as follow: 1. The average cycle time of chewing carrot was longer than that of chewing ham. 2. The average occlusion time of chewing carrot was longer than that of chewing ham. 3. The ratio of average occlusion time/average cycle time of chewing ham was greater than that of chewing carrot. 4. During chewing carrot or ham, there was an increasing tendency in occlusion time and ratio of occlusion time/cycle time.

Dental Occlusion↗
PubMed1990

[The wear on enamel, amalgam and their enamel antagonists in a computer-controlled mastication simulator].

In a long-term in-vitro test the wear of enamel fossae, amalgam restorations and their opposing enamel cusps in the occlusal contact area was evaluated, qualitatively and quantitatively. The wear of enamel cusps differed from the wear of enamel fossae. The amalgam restorations wore down more rapidly than enamel fossae, but they were less destructive against their opposing enamel cusps. The wear of all tested materials was not linear. The results will serve as reference data for future long-term in-vitro tests of posterior restorative materials.

Computer Simulation↗
PubMed1990

[An in vitro test procedure for evaluating dental restoration systems. 1. A computer-controlled mastication simulator].

This article describes the development and testing of a computer-controlled chewing simulator which is able to simulate the wear mechanisms and temperature changes that can occur in the mouth. It was further evaluated if the opposing cusps used in this chewing simulator should be metallic or if natural enamel was preferential. The results indicated that the machine fulfilled the parameters concerning chewing motion and thermal changes reported in the literature. Furthermore it was shown that natural enamel cusps must be used as the opposing dentition. The chewing simulator will form a part of an in-vitro test, which will allow the evaluation of dental restorative systems under clinically relevant conditions.

Computer Simulation↗
PubMed1977

[Surgical treatment of old alveolar process fractures for the rehabilitation of mastication].

Surgical therapy of old fractures of the alveolar ridge is indicated if masticatory disturbances exist or are expected. Bony fragments of the alveolar ridge which carry teeth and are consolidated in dislocation are osteotomized, repositioned and fixed by dental splints for more than eight weeks. The guidelines for segmental and en bloc osteotomy in orthodontic surgery are applicable. Defects of the alveolar ridge are treated by vestibuloplasty or reconstructive surgery. It is also possible to combine the two methods. For the reconstruction of the alveolus, recently almost exclusively homologous transplants preserved in Cialit are used. Following reconstruction, additional vestibuloplasty may be carried out three months after the transplantation of bone or cartilage.

Alveolar Process↗