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Results for “Vertical Dimension”

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At least 73 records · Page 4Linked to original sources
PubMed2005

Determination of the occlusal vertical dimension: use of maxillary and mandibular posterior teeth measurement in edentate subjects.

Determination of the occlusal vertical dimension (OVD) is one of the most important steps in making dentures. Various techniques have been used to make these measurements. Unfortunately, there is no universally accepted method available for clinical use. The aim of this study was, therefore, to develop a technique to determine OVD for complete dentures by using parameters obtained from natural posterior dentition. The silicon impressions were made from the posterior region of the mouth from dentate patients in maximum intercuspation. The measurements were made to determine the distance between the depth of maxillary and mandibular mucobuccal reflections and the relations of the posterior teeth to the mucobuccal reflections. The mean distance between the mucobuccal reflections was 36.14 mm. in the first premolar region, 35.57 mm. in the second premolar region and 32.44 mm. in the first molar region for the right side. The findings of this study can be used as a guide for the construction of record bases and occlusal rims and for establishing the occlusal vertical dimension in edentulous patients.

Adult↗
PubMed1996

Vertical dimension of hydrated biological samples in tapping mode scanning force microscopy.

The vertical dimensions of the well-characterized test samples tobacco mosaic virus, T4 bacteriophage polyhead, purple membrane, and hexagonally packed intermediate (HPI) layer were investigated by tapping mode scanning force microscopy (SFM) in solution. Purple membrane and HPI layer were imaged in both contact mode and tapping mode SFM for direct comparison. All vertical dimensions match the known heights. The practical implications of the absence of frictional forces in tapping mode are discussed.

Bacteriophage T4↗
PubMed2003

An involvement of trigeminal mesencephalic neurons in regulation of occlusal vertical dimension in the guinea pig.

Although the occlusal vertical dimension (OVD) is strictly controlled, the neuronal mechanism of its regulation is still unclear. We hypothesize that neurons in the trigeminal mesencephalic nucleus (MesV) play an important role in the regulation of the OVD, because the MesV receives the projection from jaw-closing muscle spindles and periodontal mechanoreceptors. We measured the temporal OVD change in the guinea pig to study the effects of MesV lesions on the OVD. OVD-raised animals without MesV lesions showed a rapid OVD decrease to the same level as that in naïve controls, followed by an OVD increase after the OVD-raising appliance was removed. In contrast, OVD-raised animals with MesV lesions showed only a slight decrease in the OVD for 15 days after removal of the appliance, and then the OVD increased. The time-course of OVD development in normal-bite animals with MesV lesions was similar to that of naïve controls. These results suggest that MesV neurons are involved in OVD regulation.

Animals↗
PubMed2004

Affecting upper extremity strength by changing maxillo-mandibular vertical dimension in deep bite subjects.

The effect of vertical dimension of occlusion (VDO) on maximizing isometric deltoid strength (IDS) was measured in subjects with deep overbite. Sixteen female dental students with deep dental overbite and no history of temporomandibular joint disorder (TMD) were used as their own control and tested for isometric strength of the deltoid muscles, using a hand held strain gauge. Measurements were taken under four mandibular conditions: 1. habitual occlusion; 2. mandibular rest position; 3. biting on a bite elevating appliance set to the functional criterion of peak IDS; and 4. biting on a placebo appliance. Results showed that in deep bite subjects, isometric deltoid strength in habitual occlusion was significantly less than in the mandibular rest position. Isometric deltoid strength with the bite elevating appliance was significantly greater than isometric deltoid strength in habitual occlusion, as well as in the mandibular rest position. Isometric deltoid strength achieved in habitual occlusion and placebo did not differ. Results of this study support previous findings indicating that a change in the VDO will affect isometric strength of the upper extremities.

Adult↗
PubMed2006

[A partially edentulous case, increased occlusal vertical dimension by prosthetic treatment].

PATIENT: A 53-year-old male presented with the chief complaint of masticatory disturbance caused by many teeth missing in the upper and lower jaws. There was extensive attrition on incisors and canines which only had occlusal contact, so the case was diagnosed as overclosure. To improve masticatory disturbance as the chief complaint, removable partial dentures were made after treating the abutment teeth. An adequate vertical dimension was planned in order to restore the worn teeth on the cast, and to arrange artificial teeth in the edentulous area. DISCUSSION: An anterior teeth core made as an inter-occlusal record was useful and the arrangement of artificial teeth in the edentulous area useful for estimating the adequate vertical dimension. CONCLUSION: It is important to diagnose an adequate vertical dimension by creating acast of the original tooth form in the case of prosthetic treatment of severely worn teeth.

Denture, Partial, Removable↗
PubMed1992

A new method for positioning the maxillary anterior arch, orienting the occlusal plane, and determining the vertical dimension of occlusion.

A new method for positioning the maxillary anterior arch, orienting the occlusal plane, and establishing the vertical dimension of occlusion in edentulous patients is described. The procedure uses a newly developed registration pin assembly that is fixed to the maxillary acrylic resin baseplate. The vertical dimension of occlusion is determined by having the patient swallow. This approach eliminates the tedious and time-consuming process of trimming the occlusion wax rims. The accuracy of the new method is currently being evaluated.

Deglutition↗
PubMed1990

[Influences of changing vertical dimension, occlusal contacts of bite plane and body position on masticatory muscle activities].

The Bite plane therapy has been accepted to be useful for treatment of the patients with the stomatognathic dysfunction. The purpose of this study is to make clear the influences of changing the vertical dimension and occlusal contacts of the bite plane on masticatory muscle activities in order to improve the bite plane therapy. The full arch bite plane with an interincisal distance of 5 mm was fabricated for each one of 30 subjects without stomatognathic dysfunction. The EMG activities were recorded from the anterior part of the temporal muscles, the masseter muscles and the anterior belly of the digastric muscles bilaterally while the subject exerted tapping and maximal voluntary clenching in a postural position. Four kinds of experiments were performed as follows. In Exp. 1, integrated EMG activities of each muscle were compared with and without the bite plane. In Exp. 2, the influences of changing the vertical dimension of the bite plane (2.5 mm, 5 mm and 7.5 mm) were tested in 17 subjects. In Exp. 3, the influences of changing the location of occlusal contacts of the bite plane were studied in 12 subjects. In Exp. 4, the influence of changing the body positions on EMG activities and mandibular positions was compared in 30 subjects between the sitting and supine positions. Furthermore, the influence of the same factor was compared with and without the bite plane which was adjusted in each position. The results were summarized as follows: 1. Wearing the bite plane mainly reduced activities of the temporal muscles. 2. The bite plane with an interincisal distance of 5 mm was most effective in reducing activities of the temporal muscles. 3. Wearing the bite plane with anterior occlusal contacts reduced activities of the elevator muscles significantly. 4. Significant differences in activities of the temporal and digastric muscles were recognized between the two body positions when the bite plane was not applied. However, no significant difference was recognized when the bite plane was inserted. Furthermore, those differences were correlated with the difference in the antero-posterior mandibular displacement between the two body positions while the subject tapped the teeth. These results suggest the possibility to control masticatory muscle activities by applying the bite plane with the proper vertical dimension and occlusal contacts. In addition, it is necessary to take a suitable body position for the patient who has a difference in the mandibular displacement between the sitting and supine positions when applying the bite plane.

Dental Occlusion↗
PubMed1989

[Vertical dimension in the Begg technic].

This data of 25 treated cases in BEGG technic show, with RICKETTS analysis, a small augmentation of vertical dimensions during treatment. During retention, four of five factors improved. No correlation have been found between increase rate of vertical dimensions, treatment duration, and initial typology.

Cephalometry↗
PubMedDate not supplied

Comparing vertical dimension changes with and without a face-bow transfer.

The purpose of this investigation was to identify any difference of vertical dimension change that could be attributed to not using a face-bow transfer. Both demonstrations resulted in occlusal changes in vertical dimension. In comparing the demonstrations, where a hinge axis transfer was not taken, a greater amount of change was recorded over that observer in the demonstration where the hinge axis transfer was made. More dedicated research is clearly warranted to establish how much of the change was due to normal technical error. The time spent taking a face-bow transfer (hinge axis) may represent a small portion of the time required to accomplish adjustments on a denture where no transfer was performed. This information will allow the clinician to decide on the time they are willing to dedicate to occlusal corrections at the chair.

Dental Articulators↗
PubMed1993

Histopathological and immunocytochemical studies of the effect of raised occlusal vertical dimension on the condylar cartilage of the rabbit.

The objective of this study was to evaluate the effect of raising the vertical dimension of occlusion on the condylar cartilage of young adult rabbits. Ten rabbits of approximately the same age were divided into two equal control and experimental groups. The vertical dimension of occlusion of the experimental group was raised bilaterally 1.5 mm using composite resin. No procedure was done for the control group. Animals were sacrificed during a six week period, and changes in condylar cartilage of experimental animals (compared to controls) were evaluated histomorphometrically. In addition, alterations of collagen type I and II were detected using immunohistochemical techniques. The results demonstrated an increase in the volume of the experimental condylar cartilage, which was attributed to an increase in the cartilage zone. Immunohistochemical examination of the hyperplastic cartilage showed no evidence for the production of type I collagen. These changes in condylar cartilage were considered adaptive and may lead to change in condylar shape. Further studies are needed to show if these adaptive changes would progress into osteoarthritis.

Adaptation, Physiological↗
PubMed1991

Changes in vertical dimension of occlusion in conventional and microwave processing of complete dentures.

An investigation was made to compare the increase in vertical dimension of occlusion in complete dentures after processing with conventional and microwave procedures. Lucitone-characterized denture base material was used for 15 sets of complete dentures cured conventionally. Justi-characterized acrylic resin and microliquid were used for 15 sets of complete dentures cured by the microwave procedure. The results of the study showed increases in vertical dimension of occlusion in both methods under 1 mm, which is considered technically acceptable. However, a statistically significant larger increase was present in the microwave technique.

Acrylic Resins↗
PubMed1987

Head angulation and variations in the maxillomandibular relationship. Part I: The effects on the vertical dimension of occlusion.

A study of a small patient sample sought to assess the effects of head angulation on the vertical dimension of occlusion. In some patients, increasing the head angulations showed a positive tendency of displacement, whereas in others the displacements were negative. Most displacements were mixed and irregular. A mathematical analysis revealed no correlation and no significance in the relationship of displacement versus the progressive changes in head angulation. The tested hypothesis was that the vertical dimension of occlusion would increase (or progressively alter) as the angulation of the head was progressively increased. Twelve attempts failed to produce a recognizable and mathematically acceptable pattern of distortion. This experiment failed to support the widely held hypothesis that the patient should be seated in an upright position to prevent distortion of the recording of VDO. It appears that the best recommendation for patient posture during the establishment of the maxillomandibular relationship is one that is comfortable for the patient and is easy for the dentist to obtain the recording.

Adult↗
PubMed1988

Determination of vertical dimension by hydraulic intraoral jack.

This paper describes the application of a hydraulic intraoral jig to the establishment of the vertical dimension of occlusion for full denture construction. The device enables the patient to establish an occlusal height which is most comfortable without the intervention or guidance of the dentist. Six patients for whom new dentures were to be constructed in the University of Otago School of Dentistry were invited to participate in the study. A conventional technique of denture construction was employed, but an additional stage was introduced after the jaw records had been taken and the casts mounted. Each patient was instructed in the use of the hydraulic jig and was asked to find a comfortable bite height in his own time. The results were compared with occlusal heights determined by conventional subjective methods. The former results proved to be more repeatable than those utilizing rest position and an average free-way space. The results are discussed and the implications outlined. Suggestions for further research using the hydraulic jig are made and the authors conclude that the hydraulic jig may be used to determine vertical dimension for full denture construction.

Adult↗
PubMed1992

Influence of lower lip support on recording of vertical dimension in edentulous patients.

The purpose of this investigation was to assess the influence of differences in design of the occlusion rim on recorded vertical dimension in complete denture therapy. Edentulous patients were studied with an opto-electronic method when the vertical dimension of rest was established with and without labial support of the occlusion rim. As no significant differences were found, the results did not support the hypothesis that the contour of the lip support will influence the recorded physiological rest position. However, a significant difference between intra and extraoral placement of the point of measurement was found.

Aged↗
PubMed1997

Occlusal vertical dimension: alteration concerns.

This article exposes common myths supported by restorative dentists that serve to limit our potential for achieving more favorable results. The need to alter occlusal vertical dimension (OVD) signifies a number of concerns that include: bite force measurements, rest vertical dimension, effect on temporomandibular joint loading, effect on tooth loading, and neuromuscular adaptation/stability. There appears to be sufficient scientific support to conclude that alteration of OVD can provide a biologically compatible adjunct to treatment. These alterations can improve dentofacial esthetics, create improved visual proportions in facial height, and provide an important treatment modality for force management of the masticatory system.

Bite Force↗
PubMed2006

Comparison of the occlusal vertical dimension after processing complete dentures made with lingualized balanced occlusion and conventional balanced occlusion.

STATEMENT OF PROBLEM: An increase in occlusal vertical dimension (OVD) may occur after processing complete dentures. Although many factors that generate this change are known, no information is available in the dental literature regarding the effect that the occlusal scheme may have on the change in OVD. PURPOSE: This in vitro study compared the increase in OVD, after processing, between complete dentures with teeth arranged in lingualized balanced occlusion and conventional balanced occlusion. MATERIAL AND METHODS: Thirty sets of complete dentures were evaluated as follows: 15 sets of complete dentures were arranged in conventional balanced occlusion (control) and 15 sets of complete dentures were arranged in lingualized balanced occlusion. All dentures were compression molded with a long polymerization cycle. The occlusal vertical dimension was measured with a micrometer (mm) before and after processing each set of dentures. Data were analyzed using an independent t test (alpha=.05). RESULTS: The mean increase in the OVD, after processing, was 0.87 +/- 0.21 mm for the control group and 0.90 +/- 0.27 mm for the experimental group. There was no significant difference between the groups. CONCLUSION: After processing, dentures set in lingualized balanced occlusion showed an increase in OVD similar to those set in conventional balanced occlusion. CLINICAL IMPLICATIONS: Although the 2 occlusal concepts resulted in similar increases in the OVD after processing, the lingualized balanced occlusion may result in easier occlusal adjustments, as the less complicated occlusal scheme uses a smaller number of centric occlusion contact points.

Acrylic Resins↗
PubMed2002

Changes in occlusal vertical dimension in microwave processing of complete dentures.

This study investigated the effect of different microwave curing cycles on the changes in occlusal vertical dimension of complete dentures. Four test groups with 12 maxillary dentures each were evaluated. Groups 1, 2 and 3 were polymerized with different cycles by microwave radiation and Group 4 was the control and cured by water bath. The average pin opening for all groups was less than 0.5 mm. There was no significant difference between the groups polymerized by the microwave method and the control group. However, analyses of the vertical dimension changes showed statistically significant differences between groups 2 (0.276 +/- 0.141 mm) and 3 (0.496 +/- 0.220 mm).

Acrylic Resins↗