A diagnostic craniometric method for determining occlusal vertical dimension
TL;DR: The results revealed that left ear-eye distance can be used to predict chin-nose distance with reasonable accuracy, however, the algorithm for making this prediction is not the same for combinations of sex and ethnic origin.
Abstract: There is no precise scientific method for determining the correct edentulous occlusal vertical dimension. This study established the proportion between the ear-eye to chin-nose distance for determining reasonable occlusal vertical dimension. Two hundred white and 400 Asian men and women participated in this study. The ear-eye and chin-nose distances were measured with a modified craniometer. The results revealed that left ear-eye distance can be used to predict chin-nose distance with reasonable accuracy. However, the algorithm for making this prediction is not the same for combinations of sex and ethnic origin.
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TL;DR: The habitual mandibular position is constantly variable and so cannot be considered as a craniomandibular reference point, and neither the vertical dimension at rest nor the centric relation can be determined by means of existing instrument-based clinical methods.
Abstract: This review argues that (1) the habitual mandibular position is constantly variable and so cannot be considered as a craniomandibular reference point, (2) there is no unique centric relation, (3) mandibular posture greatly depends on head posture, (4) clinical evaluation of the occlusal vertical dimension is mostly empirical, and (5) neither the vertical dimension at rest nor the centric relation can be determined by means of existing instrument-based clinical methods. However, some physiological conditions exist that facilitate the recording of craniomandibular position.
67 citations
TL;DR: This study showed that the use of the caliper method by predoctoral students was a significantly more reliable method of measuring the OVD for the patient evaluated.
Abstract: Statement of problem Measuring vertical dimension is a soft-tissue measurement. Therefore, inaccuracy may occur. Purpose The purpose of this study is to compare the accuracy of the Willis gauge method with the caliper method. Material and methods The Willis gauge measures the distance between the septum of the nose and the chin. The caliper method measures the distance between reference points on the tip of the nose and the chin. Twenty predoctoral students applied both methods 10 times in measuring the rest vertical dimension (RVD) and the occlusal vertical dimension (OVD) of a single edentulous patient. The measurements obtained from one experienced clinician were selected as controls for the interocclusal distances (IOD) for the Willis and the caliper methods, respectively. One-sided t tests and a 1-sided nonparametric test were used to determine significant differences between the 2 methods (α=.05). Results The variances in the RVD values for the Willis gauge method were higher than for the caliper method for most students. A Wilcoxon signed rank test showed that the accuracy of the OVD measurements for the caliper method was significantly better than for the Willis gauge method ( P =.001). This was not the case for the RVD measurements ( P =.073).The average IOD for the Willis method was significantly higher than the control IOD ( P =.026). The average IOD for the caliper method was not significantly larger than the control ( P =.1303). Conclusion This study showed that the use of the caliper method by predoctoral students was a significantly more reliable method of measuring the OVD for the patient evaluated.
63 citations
TL;DR: There is no single accurate method for OVD determination and to overcome the limitations of the techniques, the clinician will benefit from applying combination of techniques to approximate the OVD.
Abstract: Determination of the occlusal vertical dimension (OVD) is an integral part of complete dentures fabrication Due to the lack of teeth, the clinician faces the challenge of how to accurately establish the OVD of the new denture Therefore, the purpose of this review article was to present, discuss and critique the available methods used in determining the OVD for complete dentures patients This review identified two main streams to determine the OVD: (i) pre-extraction methods and (ii) post-extraction methods For the pre-extraction methods, the OVD of the natural dentition is transferred to the new dentures mainly by intra-oral measurements, profile tracing and cephalometric analysis The post-extraction methods rely on mandibular rest position, facial aesthetic appearance, swallowing pattern, craniofacial landmarks measurements, cephalometric analysis, phonetics and existing dentures In general, all the available techniques have merits and are helpful for routine clinical use However, they are empirical in nature, controversial and lack the scientific support Further, there is no single accurate method for OVD determination To overcome the limitations of the techniques, the clinician will benefit from applying combination of techniques to approximate the OVD
46 citations
Cites background from "A diagnostic craniometric method fo..."
...In a study by Chou et al.(90), it was concluded that the eye–ear distance is reliable in predicting OVD measured from the SnMe distance....
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TL;DR: A diagnostic treatment prosthesis at a vertical dimension 5 mm greater than what the patient presented with was determined to not cause discomfort over a 2-month period and a conventional complete denture was fabricated based on the patient's ability to handle the increase during the trial period.
Abstract: To maintain a harmonious craniofacial system, the dental practitioner must establish an appropriate occlusal vertical dimension (OVD). Several methods can be used to determine an appropriate OVD. The patient presenting with decreased OVD represents a particular challenge for the dental practitioner in fabricating conventional dentures. This clinical report describes the use of a diagnostic treatment prosthesis to evaluate the patient's ability to manage such an increase in vertical dimension and to reestablish an appropriate occlusal vertical dimension. The use of a diagnostic treatment prosthesis at a vertical dimension 5 mm greater than what the patient presented with was determined to not cause discomfort over a 2-month period. A conventional complete denture was fabricated based on the patient's ability to handle the increase during the trial period. This report reviews the literature on this topic and describes a clinical technique for reestablishing the OVD in edentulous patients.
29 citations
TL;DR: This study proposed to develop a methodology based on cephalometric analysis by studying the 31 lateral teleradiographs of adult, dentate individuals to determine the vertical dimension of occlusion, based on bone structures that are not dependent on the presence or absence of posterior teeth.
Abstract: doi: 101111/j1741-2358201100469x Determination of vertical dimension of occlusion in dentate patients by cephalometric analysis – pilot study
Objectives: The concept of vertical dimension of occlusion (VDO) refers to a measure in the vertical plane that establishes the relation between the maxilla and the mandible when the posterior teeth, both from the maxillary and from the mandibular arches, are occluded, regardless of whether they are natural or prosthetic, healthy or restored This measure is subject to change, and when this occurs, it can compromise both the function and the facial aesthetics This study proposed to develop a methodology based on cephalometric analysis by studying the 31 lateral teleradiographs of adult, dentate individuals to determine the VDO, based on bone structures that are not dependent on the presence or absence of posterior teeth The final goal was to make this application accessible to individuals who have undergone alterations of the lower portion of the face
Materials and methods: The cephalometric analysis of this study, called Seraidarian-Tavano, was verified through facial angles (upper and middle angles) that, when correlated, determine the lower position of the face
Results: The analysis of results showed that no statistically significant difference between the angles studied could be observed (superior angle 5029 ± 335 e median angle 4995 ± 337) In the same manner, no variation in the results regarding gender in the measure of these angles could be observed
Conclusion: This cephalometric analysis can be applied to determine the VDO, regardless of the presence or absence of posterior teeth
25 citations
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TL;DR: Almost inevitable degenerative changes develop in the edentulous regions of wearers of complete upper and partial lower dentures, and following six patients over a three-year period with cephalometric radiographs to determine if these changes could be detected.
Abstract: Almost inevitable degenerative changes develop in the edentulous regions of wearers of complete upper and partial lower dentures. We have followed six patients over a three-year period with cephalometric radiographs to determine if these changes could be detected. In all six subjects, early changes that could become gross changes were apparent. In one of them degenerative clinical change is beginning to appear. This problem might be solved with treatment planning to avoid the combination of complete upper dentures against distal-extension partial lower dentures. The alternative of complete maxillary and mandibular dentures is not attractive to patients. Preserving posterior teeth to serve as abutments to support lower partial dentures and to provide a more stable occlusion is a better alternative. Ill-fitting dentures have been blamed for all of the lesions of the edentulous tissues, yet the most perfect denture will be ill-fitting after bone is lost from the anterior part of the ridge. Removable dentures need periodic attention at least as often as the natural teeth.
243 citations
235 citations
Book•
01 Aug 1994
TL;DR: The basic principles of denture prosthodontics, as well as practical applications, can be found in textbooks, manuals, and computer manuals.
Abstract: Essentials of complete denture prosthodontics , Essentials of complete denture prosthodontics , کتابخانه دیجیتال جندی شاپور اهواز
209 citations
TL;DR: Much of the controversy over the significance of clinical rest position stems from imprecise and inadequate definitions.
Abstract: A n understanding of factors which determine the position of the mandible with respect to the maxillae is critical for clinical dentistry. One of the more controversial aspects of jaw relation involves vertical rest position. Establishment of a correct vertical dimension of occlusion is of concern in several dental specialties. In the prosthodontic treatment of the edentulous patient, establishment of a correct vertical rest position is considered essential.” ’ Boucher et al.’ noted that if the vertical dimension is too great the patient may complain of soreness of the residual ridges, tightness of facial muscles, and clicking of the dentures during speech. If the vertical dimension is too small, the patient will look older as the lower half of the face is compressed, the cheeks and lips are slack, and the chin protrudes.’ For dentulous patients, Ramfjord and Ash’ have claimed that altering the vertical dimension of occlusion may result in traumatic occlusion. They also warn that altering the vertical dimension of occlusion can be a contributing factor in the progress of periodontal disease.’ Intruding upon the freeway space (interocclusal distance) is also believed to result in continuous hyperactivity of the masticatory muscles..’ Much of the controversy over the significance of clinical rest position stems from imprecise and inadequate definitions. Rest position, defined according to the Glossary of Prosthodontic Terms, is “the postural relation of the mandible to the maxillae when the patient is resting comfortably in the upright position and the condyles are in a neutral unstrained position in the glenoid fossae.“” One can easily see that this definition is inadequate. How is “postural position”
168 citations