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At least 37 records · Page 2Linked to original sources
PubMed2000

Periodic evaluation of the occlusal vertical dimension of maxillary dentures from the wax trial denture through 48 hours after polymerization.

PURPOSE: This study measured the effects of commercial resin type on maxillary complete dentures with monoplane teeth by periodically comparing the occlusal vertical dimension of the polymerized dentures with the baseline, wax trial denture fiducial measurements. MATERIALS AND METHODS: Commercially available compression-molded, injection-molded, and fluid poly(methyl methacrylate) resins, as well as one compression-molded methyl acrylate ester copolymer, were evaluated. Ten dentures were fabricated from each resin using monoplane teeth. The occlusal vertical dimension at the articulator pin was measured at the wax denture stage for each specimen, and changes in occlusal vertical dimension for each denture were evaluated at a simulated laboratory remount, and at 0, 3, 6, 24, and 48 hours after a simulated clinical remount. Repeated measures analysis of variance (alpha = 0.05) and post hoc one-way factorial analysis of variance and Scheffe's F-Tests for each resin group were performed using ranks of raw data. RESULTS: Changes in the maxillary denture mean occlusal vertical dimensions were recognized throughout the evaluation periods compared with the wax-denture baseline, and time was a significant influence on displacement (p = .0001). Only the compression-molded poly(methyl methacrylate) dentures exhibited a mean laboratory remount occlusal vertical dimension that was significantly greater than the mean wax denture measurement, and all resin systems exhibited occlusal error that was significantly less than the laboratory remount measurements at 48 hours. At 48 hours, all resin groups exhibited mean occlusal vertical dimension changes that were less than 1 mm compared with the wax denture. Only compression-molded poly(methyl methacrylate) dentures exhibited a mean 48-hour clinical remount measurement that was statistically similar to the mean wax denture occlusal vertical dimension. CONCLUSIONS: Individual maxillary dentures from all resin types and at all intervals exhibited dimensional change. At the last evaluation period, the compression-molded poly(methyl methacrylate) showed no change in mean occlusal vertical dimension from baseline, whereas remaining groups exhibited occlusal vertical dimensions significantly less than baseline.

Acrylates↗
PubMed1997

[Analysis of the measurement on of the maxillofacial soft tissue's parameters association with vertical dimension]

The rehabilitation of vertical dimension of occlusion(VDO) exactly is one of the most important procedure for dental prosthesis in the field of prosthodontics.In this study,total of 19 subjects with normal range occlusion were selected.We measured 33 parameters relating to VDO of their facial soft tissue at intercusping position,with the technique of digital imaging analysis.The results as follows:we established a set of normal values of facial soft tissue parameters,which is suitable for the age group of 21-24 years old.It would provide an objective criterion for the rehabilitation of VDO.Also the normal values in this studies had been compared with other other studies,and it showed that the values of some parameters in our study,such as CH-CH',nasolabial angle were very close to oter data.Furthermore,it was found that both the position of the upper lip and the lower lip of the subjects were more anterior to that of white men,while the degrees of nasolabial and labiomental convexity were less obvious.

Journal Article↗
PubMed1995

Vertical dimension and therapeutic choices.

The vertical skeletal pattern is a factor that makes malocclusions with the same tooth arrangement very different. A sample of 323 patient records was examined to observe variations in vertical dimension. The sample was divided into essentially three groups. The differences most commonly encountered during the treatment of the three groups are described and illustrated with brief case reports of patients representative of each of the three groups.

Adolescent↗
PubMedDate not supplied

[Comparison of physiologic methods of determination of occlusal vertical dimension in edentulous persons].

Occlusal vertical dimension (OVD) is the distance of the mandible from the maxilla determined by the length and position of teeth in central occlusion. In edentulous mouth OVD is not preserved. Tooth loss causes the loss of OVD, so that it must be determined in the appropriate way. In clinical practice, several methods and indicators are used, in making of full dentures that represents a dilemma for dentist practitian which methods to use for the establishment of appropriate OVD. The aim of this investigation was to compare the obtained results in application of physiological methods of phonation, deglutition and electromyography that were used for the determination of OVD. Investigation comprised 18 edentulous patients, of skeletal class I by Angle with healthy stomatognathic system. Estimation of results value of the applied methods was done electromyographically. Upon the obtained results of the investigation, it was concluded that the optimal accuracy was obtained by the method of electromyography, which was also confirmed by the measured OVD that was in average higher for 1.50-2.00 mm compared to OVD determined by the methods of phonation and deglutition. In the clinical practice, where possible, we recommend the method of electromyography in determination of OVD in edentulous patients, and subsequently the method of phonation and method of deglutition, respectively.

Action Potentials↗
PubMed2003

Enamel loss and occlusal vertical dimension. Causes and considerations for treatment.

Much of the accelerated or premature loss of vertical dimension experienced by patients is certainly preventable, and prevention should be emphasized. Recommendations on limiting any nicotine and caffeine use, supporting needs for fitness efforts, and assisted or self-management of damaging habits from stress are vital Restoratively along with aesthetics, substantial, functional vertical dimension changes may now be addressed conservatively, using a range of strategies and current state-of-the art materials. Patients should become better informed about the importance of a good dentition for their better general health. Restorative alteration of vertical dimension may not be universally essential. Nevertheless, the profession, patients, and the third-party payment community must unequivocally recognize the physiologic advantage of restoring lost FOVD. The simple replacement of missing or damaged teeth without also reviewing and often addressing related facial proportions, occlusion, and vertical dimension concerns can be too limited a treatment option. Treatment of this current and ever-increasing condition cannot be sparingly restricted to the realm of specialists. In light of current population demographics, general dentists must inform themselves of extensive, currently available information in order to improve their proficiency and gain more confidence in addressing these multifaceted, ever more common problems. Examining all treatment variables in conjunction with the proficient determination for improved masticatory function and durability will increase our potential for achieving more favorable outcomes. New research in these areas will continue to be applied in order to optimally compose and implement modern comprehensive treatment plans and better evaluate post-treatment success. Not taking the interrelated issues discussed in this article into consideration, or a failure to assess and better engage these increasingly widespread needs of our population, could severely compromise the dental health of an increasing number of current and future patients.

Crowns↗
PubMed1990

An acoustically investigated case of phonetic change in higher vertical dimension.

This report presents the phonetic changes of a patient whose occlusal vertical dimension is extended. His chief complaint is esthetic restoration of his anterior teeth, but his occlusal vertical dimension is abnormally shortened by long-time attrition. Therefore we extended his occlusal vertical dimension, and reconstructed his occlusion, and carried out acoustic observations.

Aged↗
PubMedDate not supplied

Using computerized cephalometrics to analyze the vertical dimension of occlusion.

A computer program that uses cephalometric analyses for determining the patient's occlusal vertical dimension has recently been introduced. Data generated from this computer implies changes in incisal-pin position for articulated casts. This study evaluated the accuracy of this vertical-dimension program using 24 completely dentate, white male subjects with clinically acceptable occlusal vertical dimensions. A cephalometric radiograph was made, and measurements from the tracing were entered into the computer for analysis. Recommended incisal-pin changes ranged from -11 to +25.3 mm, with a mean change of 8.4 mm for all methods tested. These results showed a low correlation with each subject's clinically determined occlusal vertical dimension.

Adult↗
PubMed1991

Relationship of occlusal vertical dimension to the health of the masticatory system.

Changes in occlusal vertical dimension have been claimed to cause masticatory system disorders. Early articles on this subject were mainly limited to clinical case reports, and the more recent clinical studies have been flawed by the lack of control groups, blind evaluation, and by poor definition of criteria for evaluating the health of the masticatory system. Research with humans and animals has shown that if increases in occlusal vertical dimension are not extreme and the appliance used covers most of the dentition, there is a good possibility of adaptation. Current scientific knowledge does not support the hypothesis that moderate changes in occlusal vertical dimension are detrimental to the masticatory system.

Animals↗
PubMed1992

A preliminary investigation into the effect of increased occlusal vertical dimension on mandibular movement during speech.

Current methods of determining whether a patient will accommodate to an increased occlusal vertical dimension rely on a largely subjective assessment of the mandibular rest position and capacity to adapt whilst wearing a temporary appliance. The purpose of this preliminary study was to establish if mandibular movement during speech may provide an objective criterion in the assessment of adaptation to increases in occlusal vertical dimension. The closest speaking space, measured as the vertical distance between an incisor point and centric occlusion, as determined during pronunciation of sibilant speech sounds was chosen to depict mandibular movement. The closest speaking space was determined using a Sirognathograph for six young adult subjects and varied from a mean of 1.0 to 3.3 mm. An acrylic splint covering the entire occlusal surface of the lower arch, designed to increase the occlusal vertical dimension by 4 mm in the incisor region, was then cemented on each subject's mandibular arch. The closest speaking space was again determined after 5 days continuous wear of the splint and the mean values found to have decreased to a range of 0.0-1.0 mm. The differences between the mean values for the closest speaking space for each subject before and after splint wear were statistically significant. It was postulated that this method may lead towards an objective basis for deciding if patients will adapt to an increase in occlusal vertical dimension.

Adaptation, Physiological↗
PubMed1991

Measuring pressures under maxillary complete dentures during swallowing at various occlusal vertical dimensions. Part II: Swallowing pressures.

The swallowing pressures of seven edentulous patients were measured at seven different occlusal vertical dimensions. In addition, the projection surfaces of the maxillary dentures were measured and the forces on the maxillary denture-bearing surfaces were calculated. The swallowing pressures were measured from the maxillary denture base-mucosal surface interface by means of a "closed" hydraulic system described in Part I. The mean values of swallowing pressures increased from 7.95 +/- 2.25 to 10.18 +/- 3.42 kPa as the occlusal vertical dimension increased, and then decreased to 8.38 +/- 3.55 kPa at the highest occlusal vertical dimension. The results of a two-way analysis of variance showed significant differences of swallowing pressures between patients (p less than 0.001) and between different occlusal vertical dimensions (p less than 0.001). The projection surfaces of maxillary denture bases were measured and ranged from 21.65 to 27.78 cm2. The forces exerted on these surfaces during swallowing were also calculated and ranged from 12.5 to 47.7 N.

Adult↗
PubMedDate not supplied

A preliminary study on the effect of occlusal vertical dimension increase on mandibular postural rest position.

The effect of increasing the occlusal vertical dimension on the mandibular postural relation was studied for eight subjects. Interocclusal rest space measurements were made weekly for 1 month prior and subsequent to increasing the occlusal vertical dimension by 3.5 to 4.5 mm interincisally using luted acrylic resin, complete-arch, fixed partial dentures. Interocclusal rest space measurements were made at the clinical rest position, which was established by requesting the subjects to close in maximum intercuspation and immediately relax their mandible. Interocclusal rest space measurements were also made at the more open resting position when the subjects were repeatedly instructed to relax and lapse into a semi-hypnotic condition termed "relaxed resting posture." Initial speech difficulties and muscle discomfort subsided after 1 to 2 weeks. Analysis of variance using repeated measures showed no significant difference in interocclusal rest space after increasing the occlusal vertical dimension for both clinical rest position and relaxed resting posture. A significant difference was found between clinical rest position and relaxed resting posture (P = .001), and no interaction was determined between clinical rest position, relaxed resting posture, and time.

Adaptation, Physiological↗
PubMed1992

Occlusal vertical dimension changes in visible light-cured resin.

On a twenty standard, identical edentulous upper and lower casts, an identical upper and lower waxed-up sets of dentures were constructed with same vertical dimension of occlusion. These waxed up dentures were divided into two equal groups. For group I, the dentures sets were processed in compression molding heat-cured acrylic resin denture base material. For group II, the denture sets were processed in visible light-cured denture base material. After processing the vertical dimension of occlusion was measured for every denture set in both groups. It was found that there was an increase in the vertical dimension of occlusion on group I and a decrease in the vertical dimension of occlusion in group II. Regardless of the direction of the changes in the vertical dimension of occlusion, it was found that there was a significant difference between the dimensional changes in both groups and the dimensional changes in the denture bases of group I was more than group II by 54.5%.

Acrylic Resins↗
PubMed1977

The relationship of vertical dimension of atypical swallowing with complete dentures.

A number of subjects were studied cineflourographically during swallowing, and their vertical dimensions of occlusion were clinically evaluated. The subjects who had reduced vertical dimensions of occlusion were older than those with normal vertical dimensions, their dentures were older, their total years with complete dentures were more, and the tendency to swallow without opposing tooth contact was greater. The cumulative evidence indicates that such aberrant muscle activity might contribute to the regressive changes found in complete denture wearers.

Aged↗
PubMed2003

Reestablishing occlusal vertical dimension using a diagnostic treatment prosthesis in the edentulous patient: a clinical report.

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.

Dental Occlusion↗
PubMed2002

The effect of increasing vertical dimension of occlusion on facial aesthetics.

AIM: To investigate the effect of increasing the vertical dimension of occlusion on facial aesthetics. SETTING: General practice. METHOD: Questionnaires were sent to 96 patients who had been treated in the practice during the period of July 1998 to December 2000, resulting in an overall 72% response rate. All these patients had had their occlusal vertical dimension increased. Photographs of patients were taken before, during and after treatment. The questionnaire asked their opinion on the effects of the treatment on their facial features. To obtain an objective view to substantiate the opinions of the patients, a panel of five judges reviewed the before and after photographs and filled in their own questionnaires. RESULTS: Of the patients who responded to the questionnaire, 79.7% said they looked younger after the treatment. The panel thought 81.2% of the patients treated whose photographs they reviewed looked younger. CONCLUSION: Increasing the vertical dimension of occlusion can have far reaching effects on facial aesthetics, not just on the peri-oral areas but on the whole face.

Adult↗
PubMed1989

[The therapeutic impact of the Begg technic on vertical dimension].

In order to check the vertical dimension of children treated with the BEGG technique, 138 children aged 11 or 12 have been compared to the untreated children of the RIOLO, MOYERS, MAC NAMARA, HUNTER Atlas. 1. With the mesofacial children the vertical measurements increase very little under the treatment (SWAIN, ACKERMANN). 2. With half of the brachyfacial children--whose vertical measurements at the end of the traitment are lower than those of their group--the vertical measurements increase much above the average brachyfacial group. With the other half of the brachyfacial children--whose vertical measurements at the end of treatment are the highest in their group--the vertical measurements don't increase much. 3. With some of the dolichofacial children--whose vertical measurement at the end of treatment are high compared to the average dolichofacial group--the vertical measurements increase very little With other dolichofacial children--whose vertical measurements at the end of treatment are low compared to the average dolichofacial group--the vertical measurements increase with the treatment.

Cephalometry↗
PubMed1978

Rest vertical dimension determined by electromyography with biofeedback as compared to conventional methods.

This study was undertaken to determine if electromyography with biofeedback can be utilized to produce a more reliable determination of rest vertical dimension than conventional methods such as phonetics and swallowing. It was found that: 1. Electromyography with biofeedback appeared to produce a more consistently reliable determination of rest vertical dimension than conventional methods when used with edentulous subjects. 2. Determinations of rest vertical dimension by individual dentists using phonetics and swallowing had wide variations in two of the five patients in a range of up to 6 mm. An error of this magnitude could easily cause an intrusion upon the interocclusal distance and resultant failure of treatment. Since this study was limited to five patients, a more expanded study is necessary to determine the validity of electromyography vs. conventional methods for determining rest vertical dimension. Both methods have questionable aspects in relation to the time of day, patient's understanding of each technique, and past dental history. However, the most critical problem of the electromyographic technique is the feasibility of its use in a private practice in light of the excessive cost of the required equipment.

Biofeedback, Psychology↗
PubMed1983

Histologic changes in rat masticatory muscles subsequent to experimental increase of the occlusal vertical dimension.

Histologic changes in various masticatory muscles were studied in Wistar rats from 12 hours to 84 days after an experimental increase of the occlusal vertical dimension. The increases applied (1 to 2 mm) were based on the amount of interocclusal space (1 mm) in the rat. A sequence of tissue reaction from early acute inflammatory destruction of myofibers to healing with myofiber regeneration was most pronounced in the deep masseter muscle of the 2 mm group (12 hours to 21 days). A similar sequence was also observed to a lesser degree in the superficial masseter and anterior temporal muscles, while no changes were detectable in the posterior temporal, medial pterygoid, and anterior digastric muscles of this group. Variable severity of tissue response in different masticatory muscles might be attributable to the amount of stretching of myofibers as a result of an increased occlusal vertical dimension. On the other hand, degenerative atrophy of myofibers in the lateral pterygoid muscle occurred within 2 days with no sign of inflammation, and these condensed myofibers persisted as late as 84 days. Based on these findings, it was suggested that displacement of the mandibular condyle would exert an important influence on the prognosis after an increase in the occlusal vertical dimension. Only a transient acute inflammation occurred in the deep and superficial masseter muscles in the 1 mm group. Except for a small number of condensed myofibers in the lateral pterygoid muscle, degenerative changes of myofibers were not revealed. Therefore, increasing the occlusal vertical dimension within the extent of the interocclusal space might be regarded as appropriate for prosthodontic practices.

Animals↗