پروتز پارسیل متحرک

Removable partial denture (RPD) is a common treatment to restore partially edentulous areas; however, a limited number of studies have been made on oral hygiene habits among patients with RPD. The aim of this study was to evaluate the patients’ knowledge about various cleaning methods of RPD to consciously improve hygienic habits of the patients.

This study was a cross-sectional study performed on 96 RPD patients referred to Jundishapur faculty of dentistry from 1395 to 1396. Demographic data namely age, sex, level of education, and other information about general health status, duration of dentures usage, and denture cleaning frequency were taken by the census through questionnaires. The descriptive statistics, chi-square, and T-test were used for statistical analysisof data (P<0.05).

The patient age, sex, and smoking habits had significant effects on the prosthesis maintenance habits (P<0.05). The patients over 50 years of age, females, and nonsmokers significantly preferred dipping method over other RPD storage methods (P<0.05). The frequency of denture cleaning was significantly greater in males (53.3%) compared to females (23.9%) (P<0.05).

According to the results of this study, most RPD patients did not clean their dentures appropriately and have little knowledge on how to maintain and clean them. Regular and periodic recall and written instructions might be helpful to improve patientschr('39') awareness on proper cleaning and maintenance of partial dentures.

Removable partial denture (RPDs) is a common therapy for rehabilitation of partialy edentulous patients while RPD causes a lot of periodontal problems. The purpose of this study was to investigate the effect of RPDs made in Babol dental school on the periodontal health of abutment and non-abutment teeth. In this cross sectional study, 70 patients who were candidates for RPDs divided into four groups according to Kennedy classification. The following periodontal parameters were evaluated for abutment and non-abutment teeth, plaque index (PI), calculus index (CI), width of keratinized gingiva, bleeding on probing (BOP), periodontal pocket depth (PPD), tooth mobility (TM) and gingival recession. This clinical measurement was taken immediately before insertion of the RPD, then one, three, and six months later. These parameters were then analyzed using Mann-Whitney, Independent sample t-test, Covariance, Chi-square statistical tests. In Class I; the mean score for the width of keratnized gingiva (P<0.001), PPD (P=0.002), and BOP (P<0.001) of the abutment and non-abutment teeth were significantly different after 1 month. After 3 months there were significant differences with regard to the PI (P=0.01), width of keratnized gingiva (P<0.001), BOP (P<0.001) and PPD (P<0.001). After 6 months, only the PI, CI, and TM parameters were not statistically significant. In Class II; the mean score for width of keratnized gingiva (P<0.001) and PI (P=0.002) after 1 month, width of keratnized gingiva (P<0.001), BOP (P=0.02), PPD (P=0.05) and TM (P=0.03) after 3 months and width of keratnized gingiva (P<0.001), PI (P=0.04), BOP (P<0.001) and TM (P=0.03) after six months were statistically significant. In Class III; only gingival recession did not show any significant difference at 1 and 3 months later. The width of keratnized gingiva (P<0.001), PI (P=0.001), BOP (P<0.001) and TM (P=0.03) after 6 months were statistically significant. This study showed that RPDs affect the periodontal condition of both abutment and non-abutment teeth, which can be reduced by more precise design of the prosthesis, periodontal follow ups and good oral hygiene.

A large number of software programs have been used in dentistry for diagnosis and treatment planning to date. However, due to promotion of programming languages and developments in dental sciences, it is necessary to develop and update these softwares. Use of softwares for treatment planning for removable partial dentures has been popular for some time and always new softwares have been introduced to solve the problems of previous softwares. The aim of this project was to develop, optimize and update a software program for treatment planning with an easy and user-friendly appearance to solve the problems of previous softwares based on opinion polls.
In this applied study, carried out in 2014, the basic principles of designing removable partial based on the latest edition of McCracken's Removable Partial Prosthodontics textbook (2011) as a reference as well as the opinions of prosthodontics professors of Medical Sciences Universities in Iran and an algorithm was prepared to achieve the best treatment plan. The software program was produced using Basic programming language in Microsoft Visual Studio 2010 environment. For assessment of the software, 40 cases of the most common partial edentulous cases were tested with the software and the results were compared with the reference textbook and the opinion of the university professors.
Of 40 cases tested by the software, 36 treatment plans conformed to the principles suggested by the reference textbook and the opinions of university professors.
Based on the results of this study, the accuracy of 90% of the treatment plans were confirmed, indicating the efficacy of this software. However, the remaining 10% show the need for optimizing the software in future, which can be implemented by revising the software to achieve higher efficacy.

The use of the resin composite to alter the contour of the tooth has been recognized as a reasonable and non-aggressive method for improving the amount of stoppage for improving the retention of the removable partial prostheses. The aim of this study was to determine the amount of the required force to overcome the retention of undercuts created with resin composite on the abutment teeth
In this experimental trial, 20 first premolars were assigned into 2 groups. The resin composite for recontouring the abutment teeth in the buccal surfaces was applied to create the 0.25-mm undercuts. The control teeth with the untouched enamel surfaces were mounted at an angle to form the 0.25 mm undercut on the buccal surfaces. Both groups were encountered by a Zwick/Roelts apparatus under a repetitive force of 4500 cycles. The off-take forces measured before implying the enforce and off-take movements (T0) and after the frequencies mounting500, 1000 and 1500 Hz. The mean amount of the force in every phase of the experiment was compared by Mann-Whitney U test between two groups
Loss of composite bond was not observed. The maximum and minimum of the forces were detected in T0 phase by the resin composite (17.5 and 3.75 N). Also, significant differences were observed in the off-take force between two groups after applying 500 cycles and after implementing the test (p The force required to off-take the framework after implanting for 4 years usage of removal partial prostheses in the teeth with natural enamel coverage was three times more than the contoured group with the composite resin.

Regarding the serious problems of RPDs(removable partiale denture) on oral soft and hard tissues and the importance of preventing them, this study was aimed to evaluate the Effect of verbal and pamphlet technique instructions in oral hygiene education on periodontal status of removable partiale denture wearers.

In this study, 30 subjects with removable partial dentures were evaluated. The patients were divided into 3 groups; Group 1: patients that are hygiene Educated by student. Group 2: the patients that learning oral brushing, flossing and administration of chlorhexidine in addition to group 1 educations and group 3 recieved educational pamphlet. The patients were examined after 3 months to assess the impact of hygiene education on clinical GI, PD, PI, CAL, GBI. The Repeated Measure ANOVA, Kruskal-Wallis and Wilcoxone test used to comparing periodontal status.

After the 3-mounth follow-up periods, the Significant differences in PI, GBI, PD and GI were observed in groups of 2 and 3versus group1 (P<0.005). There were no significant differences between group 2 and 3.(P>0.05)

Considering to the results of this study, it seems that verbal and pamphlet technique instructions are effective methods to reduce periodontal disease in partiale denture wearers.

One of the complications of removable partial dentures is debonding of the acrylic resin from the cobalt-chromium framework. Several factors are involved in this chemical and physical bond. The aim of this study was to investigate the effect of applying primers and sandblasting on bond strength between the metal and the acrylic resin in mesh and ladder-like frameworks. In this in vitro study، 30 frameworks with ladder-like design (A) and 30 frameworks with mesh-like design (B) were fabricated. The mesh-like and ladder-like frameworks were each subdivided into three subgroups: 10 specimens in each subgroup were un-treated as the control group (A1 and B1); 10 specimens were sandblasted (A2 and B2)، and 10 were both primed and sandblasted (A3 and B3). Then the acrylic resin base was bonded to metal surfaces and the metal‒resin bond strength was examined by an Instron testing machine and recorded in Newton. Data were analyzed using two-way ANOVA and Tukey test (α = 0. 05). There were significant differences between the three preparation techniques (p value < 0. 001). There were no significant differences between the mean bond strength values of ladder (785. 90 ± 207. 24N) and mesh type (718. 60 ± 216. 83N) frameworks (p value = 0. 133). Mean bond strength values of sandblasting and primer (947. 38 ± 86. 18 N) were significantly higher than those of sandblasting (749. 5 ± 142. 11 N) (p value < 0. 001). Sandblasting resulted in a significantly higher bond strength values compared to the control group (539. 47 ± 164. 09 N) (p value < 0. 001). Sandblasting alone resulted in a 38% increase in bond strength whereas applying primers with sandblasting increased bond strength by 75%. Sandblasting and primer significantly influence resin‒metal bond strength. Subjecting frameworks to a combination of priming and sandblasting produces the highest bond strength.

A removable partial denture (RPD) is a common treatment modality for restoration of partially edentulous ridges. How ever this type of treatment may produce serious periodontal problems for remaining teeth.The aim of this study was to determine the effects of RPDs with RPI design on the periodontal indices of abutment and non abutment teeth.For this interventional and prospective study, 22 patients (30-68 years old; mean age of 48 years) were selected. All patiets has Kennedy class I partial edentulous areas and were supposed to use removable partial dentures. Forty eight abutment and 48 non abutment teeth were assigned for this study. Clinical parameters including clinical probing depth (CPD), clinical attachment level (CAL), keratinized gingival width (KG), gingival index (GI) were measured in abutment and non-abutment teeth at baseline,1,4 and 12 months after delivery of RPDs. Data were analyzed using wilcoxon test.All clinical indices with the exception of gingival index, at the time of baseline to 12 months, showed significant differences between abutment and non-abutment teeth (p<0.001). Significant differences were also noted for all indices between abutment and non-abutment teeth after 12 months.The results of this study indicated that removable partial denture with RPI design plays an important role in producing and intensifying the periodontal diseases in both abutment and non abutment teeth. It seems that this effect is due to the accumulation of more bacterial plaque. So, use of appropriate design and recommendation of good oral hygiene may decrease the severity of side effects.

As conventional prosthesises are still the most common prosthetic treatment for public, this study has been conducted to assess the communication between the dentist and dental laboratories and find the supervision of the dentists on lab works. In this descriptive, cross- sectional study, by referring to ten dental laboratories, seven basic steps of the construction of PDRs have been considered and all the necessary information was recorded in a questionnaire. In %83 of the cases, RPDs were constructed on the study diagnostic casts and for %100 of the cases no border molding had been done. %83.7 of the retentive clasps were not actually retentive, but again in %83.7 of them there was some form of reciprocal component. In %96.7 of the cases, the clasp arms were fabricated on unprepared tooth surfaces. All major connectors were rigid and in %42.9 of the cases they had enough distances to gingival margins. In most cases, indirect retainers were absent or were made in wrong places. Only in 10 out of 35 distal extension cases, RPD design was considered and for the rest, no special design was observed. In only %5, guiding planes were made on prepared tooth surfaces and finally it appeared that the majority of RPDs were designed by dental technicians rather than by dentists. The results indicate that dentists frequently use techniques that require a minimum of appointment time. Therefore, a greater emphasis is required to be put on continuation of education for dentist, along with better and more detailed communication between the dentists and dental laboratories.

This research was conducted in the academic year 2002-2003 in the Department of Prosthodontics of School of Dentistry, Shiraz University of Medical Sciences to investigate patients post complications after delivery of R.P.D.

50 Patients who were psychologically healthy and withoutsystemic diseases were selected. The dentures were made and delivered by sixth yeardental students. They were evaluated twice using questionaires one day and one weekafter the delivery of their dentures. Responses of patients to the proposed questions were evaluated.

Statistical analysis of the data showed that denture soreness on residual ridge and vestibule was maximum (72%), which was reduced to 12% after one week. Lack of retention in centric and eccentric was 44%, which was reduced to 15% one week later. Gag reflex and speaking inability was reduced from 44% to 4% in one week. Herpis and apthus lesion were low.

It is recommended that more precise attention be given to impression stages and occlusion adjustment while making R.P.D.