Comparative evaluation of vertical dimension at rest before extraction, after extraction and after rehabilitation with complete denture – A Cephalometric study

Abstract

Vertical dimension at rest a b s t r a c tIntroduction: The determination of physiologic rest position of the mandible to the maxillae is of paramount importance in almost all fields of dentistry. The stability of vertical dimension at rest has been controversial if the rest position of mandible remains constant throughout life or not. Despite of several studies on the rest position of the mandible and facial vertical dimension, certain fundamental disagreements remain unresolved. The present study aims to compare the vertical dimension at rest, before and after extraction and after rehabilitation with complete denture. Material & methods:This study was conducted in a total of ten randomly selected patients, who had some natural teeth present with one or more opposing posterior teeth with vertical occlusal stops but were advised for extraction because of poor prognosis. Digital lateral cephalograms were done and measurements recorded at three stages: prior to extraction of remaining natural teeth, post extraction and after complete denture rehabilitation.Results: Vertical dimension at rest was found to be greatest in post rehabilitation followed by pre-extraction than post extraction state. The differences in changes were found to be statistically significant. Conclusion: Vertical dimension at rest shows a decrease following extraction of natural teeth, the occlusal stops, and an increase on rehabilitation. It can be stated that vertical dimension at rest is not stable position and varies following extraction of natural teeth and rehabilitation.

Correlation between Finger Length and Occlusal Vertical Dimension in Adult Sudanese Women

“…However, the position of the mandible at rest is not constant and changes throughout life. Moreover, it may differ in the same individual at the same sitting or between sittings 6,15,16,33) . Despite advancements and improvements in technology and innovations in prosthetic dentistry, however, a consensus remains to be reached on how best to accurately establish the OVD.…”

Concept of rest position of mandible: An overview

“…This suggested a variability in rest position of the mandible. The presence of dentures provides artificial tooth contacts and pressure to the exteroceptors in the mucosa of the denture supporting area, mechano-receptors of temporomandibular joint and muscle which contribute to the regulating mechanism of mandibular posture [18] . In the edentulous mouth, pressure or tactile receptors in the mucous membrane investing the tongue, the residual ridges, and the lining of the lips and cheeks may be stimulated by dentures.…”

“…The most common major sudden pathologic event which might affect the rest position is the extraction of the remaining occluding teeth. Vertical dimension at rest shows a decrease following extraction of natural teeth, the occlusal stops, and an increase on rehabilitation [18] .…”

A Simplified Method to Identify Patient Face Type for a Prosthodontic Treatment Plan

“…As mentioned previously, the edentulous individual with a brachyfacial musculoskeletal type is difficult to recognize and the dentist only has the cephalometric parameter available to identify it. In edentulous patients the diagnostic method to implement is that of measuring the gonial angle on the latero-lateral X-ray, since the value of the angle is independent of the presence or absence of teeth and other anatomical parameters such as: vertical dimension, mandibular position, mandible/ cranial ratio and skeletal class (Figure 8) [22]. …”