Maxillary complete denture movement during chewing in mandibular removable partial denture wearers
Department of Dental Materials and Prosthodontics, Ribeirão Preto Dental School, University of São Paulo, SP, Brazil. Gerodontology
(Impact Factor: 1.09).
09/2008; 26(1):19-25. DOI: 10.1111/j.1741-2358.2008.00248.x
To evaluate the pattern of maxillary complete denture movement during chewing for free-end removable partial dentures (RPD) wearers, compared to maxillary and mandibular complete denture wearers.
Eighteen edentulous participants (group I) and 10 volunteers with bilateral posterior edentulous mandibles (group II) comprised the sample. Measures of mean denture movement and its variability were obtained by a kinesiographic instrument K6-I Diagnostic System, during the mastication of bread and a polysulphide block. Data were analysed using two-way ANOVA (alpha = 0.05).
Upper movement during chewing was significantly lower for group II, regardless of the test food. The test food did not influence the vertical or lateral position of the denture bases, but more anterior dislocation was found when polysulphide blocks were chewed. Group II presented lower intra-individual variability for the vertical axis. Vertical displacement was also more precise with bread as a test food.
It can be concluded that mandibular free-end RPD wearers show smaller and more precise movements than mandibular complete denture wearers.
Figures in this publication
Available from: André Gustavo Paleari
- "Such errors, however, were low in this study and equally distributed between the assessment periods. As related by Balkhi et al. (11) and advocated by Souza et al. 2009 (12), a mandibular kinesiograph is accurate for a vertical range of motion lower than 40 mm provided that the magnet is correctly positioned. These results could be valid for edentulous individuals of both genders and all ages who underwent the treatment with complete dentures. "
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ABSTRACT: Objectives: This study aimed to compare the effects of canine guidance and bilateral balanced occlusion on satisfaction and kinesiographic parameters of edentulous patients wearing complete dentures. Methods: Sixty-nine edentulous patients received one set of new complete dentures with bilateral balanced occlusion. After intraoral adjustments and adaptation period, the patients were randomly divided in two groups: canine guidance (CG) and bilateral balanced occlusion (BBO). After 30 days, the kinesiograph instrument K6-I (Myotronics Research Inc., Seattle, WA) was used to record opening and closure movement limits, postural rest position, chewing cycle and pattern of maxillary complete denture movement during chewing a test food (a piece of sandwich loaf) for 20 seconds. They also answered a denture satisfaction questionnaire. Immediately after that, the patients had their occlusal scheme changed and a new evaluation was performed 30 days after. Kinesiographic data were analyzed using t test (a=.05) and the denture satisfaction questionnaire using Wilcoxon test (a=.05). Results: The results showed no differences (P>.05) between the occlusal schemes in any of the kinesiographic parameters studied. Moreover, no differences (P>.05) were found for any answer from the denture satisfaction questionnaire. Conclusions: It can be concluded that mandibular physiologic movements, maxillary complete denture movement during chewing and patient satisfaction were not influenced by the occlusal scheme used in conventional complete dentures.
Available from: Yong Bai
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ABSTRACT: A common and extended Petri net simulation framework for virtual construction of earthmoving operations is developed to simulate dynamic changes of workflow and information flow in the earthmoving construction process and illustrate the constraint relationship between various operational equipment and construction restrictions. The proposed framework considers factors that influence earthmoving operations including randomness of construction activities, individual preference of equipment scheduling, and constraint relationship between equipment and construction environment. With the given equipment availability and project indirect cost, the framework can predict construction situation, equipment utilization rate, estimated duration and cost to achieve visualized and intelligent scheduling of virtual construction process in earthmoving operations. The simulation process is conducted on the CPNTools platform. The data required by the research were collected on-site in an actual case. The randomness of construction activities in earthmoving operations and main factors influencing construction are simulated. The sensitivity analysis for the model is carried out. The study will provide technical support and a management basis for equipment scheduling of earthmoving operations.
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ABSTRACT: The absence of posterior occlusal contacts may result in increased anterior occlusal contacts and forces between natural mandibular dentition and artificial maxillary dentition. The impact of natural mandibular anterior teeth on the development of hypermobile tissues in the anterior part of the edentulous maxillary alveolar ridge was investigated in this study. The study group consisted of 410 patients with maxillary complete dentures and various mandibular dentitions from seven rest homes in Istanbul. The data; including hypermobile tissue in the anterior part of the maxilla, occlusal relationship, nocturnal wear, denture age, and duration of the maxillary full edentulism period were recorded. A chi-square test was performed to analyze the effects of following data: Existence of mandibular anterior teeth, poor adaptation of the dentures, nocturnal wear, types of occlusal contacts, and gender, on the resorption of the anterior part of the maxilla. To examine the effects of the presence of anterior mandibular teeth and early maxillary edentulism on bone resorption in the anterior part of the maxilla, a logistic regression analysis was performed. The results reveal that patients with edentulous maxilla and natural mandibular anterior teeth are approximately twice more likely to show risk of hypermobile tissue in the anterior part of the maxilla than are full edentulous patients. Further, edentulous periods exceeding 30 years in maxilla seem to increase this risk approximately 4 times.
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