effect of misuse of denture adhesive on mucosa supporting complete denture in diabetic patients; histological and histochemical study

Ten diabetic patients, old denture wearers, have been selected from the ten diabetes institute, Cairo. The patients were divided into two groups [5 patients each]. The first group used denture adhesive continuously without any instructions, while the second group, the patients did not use denture adhesive at all. Biopsy was taken from each patient of the two groups, from the mucosa covering the lower ridge at the premolar region. The results obtained from this study showed that there were pathological changes in the mucosa supporting the denture in both epithelium and lamina propria, together with decrease in mucopolysaccharides and proteins, in the first group of patients who misused the denture adhesive, while in the second group of patients who did not use adhesive at all there were no marked pathological changes

Effect of span length on the stresses induced in denture supporting structures [Finite element analysis]

When forces are applied on the midpoint of bounded saddle RPD case, whether the case in short or long span case, these force induces stress in the abutment teeth, its periodontal ligament, and the supporting bone. The induced stress showed maximum equivalent stress in certain area in the above mentioned structures. These areas seen very logic to get these greatest values. These areas are the cervical margin of the abutment tooth towards the residual ridge, the bone and mucosa close to the cervical margins, the periodontal ligament at apex of the root towards the residual ridge, also area at the midpoint of the pontic [RPD], and the metal just below this area, where the forces is applied. Maximum equivalent stress are higher in the abutment teeth of long span than of short span case, while they are lower in both the periodontal ligament and the supporting bone of the long span than of the short span cases