Use of anterior teeth measurements in determining occlusal vertical dimension

Impressions were made from the anterior segment of the mouth in 25 subjects with their teeth in centric occlusion. Measurements were made on each impression to determine the relation of the maxillary and mandibular vestibular folds and of the anterior teeth to the maxillary and mandibular mucolabial reflections. The mean distance between the depth of the mucolabial reflections in the canine region was 36.70 mm for the right side and 36.94 mm for the left side. The mean distances for the right and left central incisor regions were 34.20 mm and 34.06 mm. The variations in the measurements of different teeth confirmed the anatomic individuality of each patient. Nevertheless, the findings of this study will be helpful as guides in the initial placement of the maxillary and mandibular anterior teeth and in the initial determination of the vertical dimension of occlusion.     

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.     

A simple technique for increasing the occlusal vertical dimension of removable denture wearers

This article describes a simple and efficient technique for increasing the occlusal vertical dimension of removable denture wearers. Functionally generated path technique is carried out by using gothic arch tracing, and the existing mandibular overdenture is modified for interim use.     

Magnetic determination of occlusal vertical dimension.

The determination of the edentulous interridge dimension is at best an inexact process. During the past seven years, the use of 1 mm thick minimagnets has been a simple, rapid, and accurate method of verifying or ascertaining interridge dimension.     

咬合垂直距离升高后咬合重建修复患者的头影测量分析

目的 采用X线头影测量方法研究咬合垂直距离(occlusal vertical dimension,OVD)升高后咬合重建修复患者的软硬组织变化情况.方法 咬合升高重建修复患者15例,分别于修复前后拍摄X线头颅侧位片进行头影测量分析,对结果进行配对t检验.结果 修复后,反映颅部骨性结构及上颌骨相对颅部的各测量项目与升高前相比,差异均无统计学意义(P＞0.05);描述颌骨矢状向关系的测量项目中,SNB角、SND角、SNPog角、颌凸角及SN-Y轴角修复前后的差异均具有统计学意义(P＜0.05);描述颌骨垂直向关系的各测量项目除ANS-FH外,修复前后的差异均具有统计学意义(P＜0.05).描述下颌骨形态的SL、SE,描述(牙合)的覆验、IMPA及FMIA,描述软组织侧貌的Z角及Sn、TUL、TLL、SB分别到McNamara线距,修复前后的差异均具有统计学意义(P＜0.05).其中SNB角减小1.13°(P＜0.05),SND角减小2.27°(P ＜0.05);SE减少1.02 mm(P ＜0.05),SL减少3.07 mm(P＜0.05).结论 OVD升高后的咬合重建修复使患者下颌骨向下向后旋转,双唇突点内收,面部比例及软组织侧貌得到改善.     

Clinical considerations for increasing occlusal vertical dimension: a review

The purpose of this article is to discuss the clinical considerations related to increasing the occlusal vertical dimension (OVD) when restoring a patient's dentition. Thorough extraoral and intraoral evaluations are mandatory to assess the suitability of increasing OVD. In the literature, multiple techniques have been proposed to quantify OVD loss. However, the techniques lack consistency and reliability, which in turn affects the decision of whether to increase the OVD. Therefore, increasing OVD should be determined on the basis of the dental restorative needs and aesthetic demands. In general, a minimal increase in OVD should be applied, though a 5 mm maximum increase in OVD can be justified to provide adequate occlusal space for the restorative material and to improve anterior teeth aesthetics. The literature reflects the safety of increasing the OVD permanently, and although signs and symptoms may develop, these are usually of an interim nature. Whenever indicated, the increase in OVD should be achieved with fixed restorations rather than a removable appliance, due to the predictable patient adaptation. The exception to this is for patients with TMD, where increasing the OVD should still be achieved using removable appliances to control TMD-associated symptoms before considering any form of irreversible procedure.     

Role of occlusal vertical dimension in spindle function

Several studies have suggested the jaw-muscle spindle as the receptor responsible for regulating and maintaining the occlusal vertical dimension (OVD). However, to challenge this assumption, we hypothesized that long-term changes in OVD could affect the sensory inputs from jaw-muscle spindles. In this study, we investigated changes in masseter muscle spindle function under an increased OVD (iOVD) condition. Responses of primary and secondary endings of masseter muscle spindles to cyclic sinusoidal stretches were investigated. Twenty barbiturate-anesthetized female Wistar rats were divided into control and iOVD groups. Rats in the iOVD group received a 2.0-mm composite resin build-up to the maxillary molars. After iOVD, masseter muscle spindle sensitivity gradually decreased. Primary and secondary spindle endings were affected differently. We conclude that iOVD caused reduction in masseter muscle spindle sensitivity. This result suggests that peripheral sensory plasticity may occur following changes in OVD. Such changes may provide a basis for physiological adaptation to clinical occlusal adjustments.     

Preservation of occlusal vertical dimension in overdentures.

The preextraction record is used to reestablish the occlusal vertical dimension in immediate and in later overdentures. A colored dot on the denture can be used to verify the occlusal vertical dimension after the dentures have been inserted.