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

Abstract

The objective of this study was to determine the size of the residual ridge in edentulous elderly Japanese persons for preparation of edentulous stock trays and clarify any correlations among the items measured. The participants comprised 74 patients requesting construction of a complete denture for the maxilla, mandible, or both. The length, width, and anterior and posterior height of the maxillary and mandibular residual ridge was measured on a prepared working model using a caliper. For each of the maxillary and mandibular edentulous residual ridges, correlations among measurement items were analyzed employing Pearson's correlation coefficient. In participants who were edentulous in both the maxilla and mandible, correlations between the maxillary and mandibular measurement items were analyzed employing Pearson's correlation coefficient. The results revealed that the mean maxillary length of the residual ridge was 55.21±4.07 mm, while mean mandibular length was 56.03±4.04 mm. The mean posterior width of the maxillary jaw was 48.79±4.14 mm, while that of the mandibular jaw was 57.33±3.24 mm. A strong correlation was found between the length and width of the residual ridge in both the maxilla and mandible, but no strong correlation was detected between the height in the anterior tooth region and any other item measured. These findings suggest that the size of any given item can be estimated by measuring either the length or width of the residual ridge when selecting a stock tray. We also propose that it is necessary to prepare stock trays with several different heights in the anterior tooth region, regardless of the length and width of the tray, or to adjust the length of the tray.

Accuracy and time efficiency of conventional and digital outlining of extensions of denture foundation on preliminary casts

“…The preliminary casts included were digitized using a laboratory scanner (Autoscan-DS-EX, Shining 3D Tech Co., Hangzhou, China) with no extension outline to verify the homogeneity in the ridge height ( Table 1 ), following the methodology of Ryu et al 27 The measurement points were set using the inspection software Geomagic Design X (3D Systems, Rock Hill, SC, USA). Posterior bilateral and anterior points were measured for maxillary and mandibular casts.…”

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

“…The term “morphology” used in this study was the collective term for the “form” and “height” of the residual ridge [ 33 ]. The term “form” was defined as the shape of the RR [ 34 ] or the cross-sectional evaluation of the RR [ 35 ], while “height” means the vertical evaluation of the RR [ 36 ].…”