Morphological characteristics of the alveolar ridge of edentulous jaws.

Abstract

Impression taking is essential step in prosthetic clinical work and a tray of an appropriate size and form must be selected to obtain accurate impressions. In taking impressions of edentulous jaws, in particular, the morphology of the alveolar ridge must be grasped precisely. Length and width of the alveolar crest therefore were measured and their correlation was examined.1. The coefficients of correlation of the maximal length of the alveolar crest with width between the posterior margins of the alveolar crest, with the width between the alveolar crest at the first molars, and with the width between alveolar crest at the canines were r=0.20, 0.43, 0.38, respectively, for the upper jaws, and r=0.14, 0.01, 0.02, respectively, for the lower jaws. No significant correlation was found.2. Significant correlation was found between the posterior margins of the alveolar crest and the width between the alveolar crest at the first molars and the width between the alveolar crest at the canines (r=0.66, 0.70) for the upper jaws.3. Significant correlation was found between the posterior margins of the alveolar crest with the width between the alveolar crest at the first molars (r=0.76) for the lower jaws.

Morphological Investigation of Residual Ridge in Japanese Edentulous Elderly for Fabrication of Edentulous Stock Tray

“…Border molding on the mandibular lingual side was performed in reference to the mylohyoid line. Mostly the same measurement points have been used to establish the width of the residual ridge in many previous studies, whereas the length of the median line has been used to measure the major axis 9,10,14,15) . However, the major axis is measured along the alveolar crest when a stock tray is selected in many cases.…”

“…Therefore, application of foreign-made stock trays in Japanese patients was shown to be inappropriate in some cases 15) . Some studies therefore investigated the morphology of the residual ridge in Japanese patients at that time [9][10][11]15) , which led to the development of stock trays suitable for this particular population.…”

The impact of residual ridge morphology on the masticatory performance of complete denture wearers

“…Among those factors, poor residual ridge (RR) morphology has always been a primary concern for clinicians hoping to achieve successful treatment because RR height and form are essential to support the denture and prevent dislodgment [ 21 ]. RR resorption leads to a decrease in the RR height [ 1 , 29 ], and the result is not only a decrease in the denture supporting areas but also a decrease in bracing and salivary retention [ 19 ]. In addition, the morphology of the RR is complex [ 1 ], and it has been pointed out that the morphology has a significant influence on the functional performance of dentures because the morphology of the RR is related to the stress distribution at the denture bearing areas [ 30 ].…”