effect of RPI and RPA retainers with long guiding planes on the gingival health of the abutment teeth

The gingival health of 36 abutment teeth in 12 RPD cases having RPI and RPAretainers with long guiding planes covering the gum margin was compared withthat of 36 abutment teeth in 12 RPD cases having design of 3 mm away from thegum margin. The GCF of the abutment teeth was collected using standardizedfilter paper placed in the gingival crevice for 30 seconds. A gingival fluidmeter was used to quantitated the gingival fluid flow. The amount of GCF flowwas used as indicator for the degree of gingival inflammation. Data werestatistically analyzed. The results indicated that the long guiding planescovering the gum margin adversely affects the gingival health of the abutmentteeth

Effect of three types of denture cleansers on the streptococcus mutans count in saliva

This study was conducted to detect the effect of three types of commercially available denture cleansers clinically on the oral mucosa and bacteriologically on saliva. Forty edentulous patients free from any oral or systemic diseases were selected in this study. Conventionally constructed dentures were delivered. At the beginning of the study the clinical condition of the mucosa was recorded. Also samples of saliva were taken, diluted and cultured on blood agar medium to count the total colony forming units, and on mitis sucrose bacitracin to count the streptococcus mutans in the samples. The patients were divided into four groups each of ten patients. For every group denture cleanser is prescribed and patients are advised to use it according to manufacturer's instructions, any other method of cleansing was prohibited. The fourth group is a control group without use of any cleanser. Patients were recalled every month for checkup of the oral mucosa and inspection of the dentures. Samples of saliva were taken before denture insertion, one month after denture insertion, [before denture cleanser use], end of the second, fourth and seventh month, these samples were diluted, and cultured, also the clinical condition of the mucosa was recorded and statistically analysed. The results indicated that chemical cleansing of dentures decreased the total number of colony forming of microorganisms and the number of streptococcus mutans. The condition of the mucosa was improved with the decrease of the oral microorganisms. Chemical cleansers containing peroxide are better than those containing sodium hypochlorite. No difference between effervescent tablets and non effervescent powder of the peroxide type was found

Studying the effect of recording the neutral zone on the residual alveolar ridge height

Forty completely edentulous patients seeking complete denture prosthesis were selected. Conventional complete denture prosthesis was made for twenty patients considering them as group one. For other twenty patients recording the neutral zone was done using self curing acrylic template consisted of upper and lower bases attached together at tuberosity - retromolar pad areas following the technique done by Neill and Glaysher 1962. Then pouring plaster indecies to surround the moulded alginate impression material which was used as recording medium. Removal of the alginate material was done leaning a space bounded by outer buccal and labial indecies and tongue imprint from inner side. Setting up the artificial teeth in the neutral zone space was done. Contouring the polished surface by zinc oxide and eugenol paste was made according to the technique of Schiesner and Beresin 1978. Then finishing and polishing was made and delivery to premolar and second molar planes]. Six measurements were from the midline of the cast to the crest of the ridge and the other six measurements were from the midline to the neutral zone points [represent the position of the teeth placed according to the neutral zone space]. In the lower casts the neutral zone points showed significant buccal position in relation to the crest of the ridge in the canine plane and very slight non significant buccal position in the second premolar plane. The second molar plane showed the neutral zinc points to the lingual side of the crest of the ridge in the lower casts. In the upper casts in the three planes the neutral zone points were buccal to the crest of the ridge. The results denote the forward position of the upper and lower anteriors in relation to the crest of the ridge. The lower premolars and molars must be on the crest of the ridge. According to this study upper molars and premolars could be placed buccal to the crest of the ridge, following the lower set up

Exfoliative cytology of the oral mucosa under free end saddles recorded by two different impression techniques, muco-static and muco-compressive

Exfoliative cytology of the oral mucosa under distal- extension bases recorded by two different impression techniques: mucostatic and mucocompressive was investigated in this study. Eleven, patients were selected and divided into two groups [five in each group as one did not continue to the end of the study]. Each patient in the two groups received a mandibular distal-extension removable partial denture with an opposing complete maxillary denture. The mandibular partial dentures in the first group were constructed from mucostatic impressions, while, in the second group from mucocompressive impressions. All other steps of denture construction were made in a standard manner for all patients. Cytologic smears of oral mucosa under distal-extension bases were collected, fixed, stained with Papanicolaou's stain and then examined microscopically to calculate the Keratinization index. This cytologic examination was done : at the time of delivery and after : one mouth, two months and three months of denture wear. At each time interval, buccal, crestal and lingual smears were collected at the first molar region of the right side. The three smears were examined and then a mean Keratinization was calculated. Data of the cytologic examination of all patients were collected and statistically analyzed. It was found that Keratinization Index of the oral mucosa was significantly reduced under lower distal-extension bases recorded by either: mucostatic or mucocompressive technique. Maximum reduction was detected after one month of denture wear. The reduction in keratinization Index was significantly more under dentures constructed with mucocompressive impression technique than with mucostatic impression technique

Oral mucosal condition under polished and unpolished acrylic complete denture

20 patients seeking complete denture were divided into two groups. Group I patients had their dentures done in conventional Way. Group II had dentures with polished fitting surface in the maxilla. Cytologic smears were taken from the mucosa of maxillary arches, fixed and dyed with Papanicolaou's stain. The calculated K1 and the leukocytic count were done before denture insersion and 1 week; 1 month and 3 months after. Data were statistically analyzed and the results indicated that the complete denture reduces the K1 in general and increases the leukocytic count. Polishing the fitting surface of complete denture affects less degree of reduction in K1 and reduces the leukocytic count of the oral mucosa under it