Comparison of mandibular bone density and radiomorphometric indices in wearers of complete or removable partial dentures |
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Authors: | Email author" target="_blank">Dubravka?Knezovi?-Zlatari?Email author Asja??elebi? |
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Institution: | (1) Department of Prosthodontics, School of Dental Medicine, University of Zagreb, Gunduliceva 5, 10000 Zagreb, Croatia |
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Abstract: | Objectives To examine bone mineral density (BMD) and linear radiomorphometric parameters of the mandible in elderly patients with different
types of dentures.
Methods Patients had mandibular complete dentures (CDs) or Kennedy Class I removable partial dentures (RPDs) in the mandible; all
patients had CDs in the maxilla. The age and sex distributions of patients with CDs and of those with RPDs were not significantly
different. Three parameters were measured in dental panoramic radiographs (DPRs) from a total of 136 patients: thicknesses
of the mandibular cortex below the mental foramen, the antegonion, and the gonion. Mandibular BMD was measured densitometrically
using DPRs and a copper step wedge. All BMD values were expressed relative to the step wedge thickness.
Results There was a significant difference between patients with CDs and those with RPDs for all the radiomorphometric indices measured
(P < 0.001); specifically, radiomorphometric indices were higher in RPD wearers. Mandibular BMD values in RPD wearers were higher
than those of patients with CDs, and BMD was significantly higher under the saddle in RPD wearers (P < 0.05).
Conclusions These results support the hypothesis that occlusal forces that are transmitted directly to the mucosa beneath mucosa-borne
dentures may cause overloading, which may cause bone resorption; by contrast, under tooth and mucosa-borne dentures, occlusal
forces are transmitted not only to mucosa but also to the periodontal ligament of the abutment teeth, thereby reducing the
transmission of force to the mucosa, which prevents overload. Greater chewing forces might thus be achieved with tooth and
mucosa-borne dentures, which may stimulate bone growth at the mandibular cortex. |
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Keywords: | Mandible Residual ridge resorption Linear radiomorphometric index Bone mineral density |
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