Aim: The aim of this study was to measure the effect of different attachments: telescopic crown, double Akers' (DA) clasp, distal clasp (DC)-retained removable partial dentures (RPDs), and cantilever bridge on the intrusive movement of the abutment teeth. Materials and methods:A model imitating mandibular ridge of Kennedy Class I was fabricated with first and second premolar as abutments. A telescopic crown, DA, DC-retained RPDs, and cantilever bridge were fabricated. Each partial denture was placed at a time on the model; 50 N force was applied on each partial denture using ZWICK universal testing machine. The intrusion of the abutments was recorded using SOLARTON device. Data were collected and tabulated. Results:The mean values of the intrusive movement in telescopic separated (TS) RPD, telescopic joined (TJ) RPD, DA RPD, DC RPD, and cantilever bridge in tooth 35 were 147, 75, 57, 334, and 307 µm respectively, and in tooth 45 were 136, 81, 65, 435, and 335 µm respectively. Conclusion:It can be concluded from the retrieved data that DA clasp-retained RPD caused less intrusion of the abutments than telescopic crown-retained RPD, followed by the DC than cantilever bridge. Clinical significance:The DA clasp is most favorable in the utilization in mandibular Kennedy Class I situation followed by telescopic crowns.

Aim: This study aimed to investigate the correlation between chewing efficiency and muscle kinetics using balanced occlusion and group function occlusion. Methodology 20 edentulous patients were selected and given a complete denture with balanced occlusion( Group A) for one month, and then they were recalled the first denture collected and a new denture using group function ( Group B) was given for one month. Chewing efficiency was measured using the standardized chewing test units (SCT) and muscle kinetics was measured using Electromygraphy (EMG). After both follow up periods, patients were asked about their satisfaction with both groups using the visual analog system (VAS). Results In Balanced occlusion there was a negative correlation of -0.594 between chewing efficiency and muscle kinetics, which means they are directly proportion to each other.. However, in group function occlusion; there was a positive correlation of 0.463, which means are inversely proportion. On the VAS scale patient satisfaction recorded 9 (highly satisfied) with the group A and 5 (Neutral) with group B. Conclusions It can be concluded from this study that the balanced occlusion scheme allowed better chewing efficiency, with lower muscle kinetics, and higher patients' satisfaction.

Aim: Evaluation of stresses induced on over-denture abutments endodonticaly treated with two different obturation techniques.Materials and methods: eight mandibular permanent canines were inserted in four pesudo-realistic models.  In each model two canines were placed in it. One canine was treated with lateral obturation technique and the other canine with vertical obturation technique. Four over-denture prostheses were fabricated on the four models. Then strain gauges were attached on the coronal one third of the root buccally and lingually for all eight canines. A metal rod was placed occlusally on the premolar –molar area, and a 50 N load was applied on the middle of the rod using the universal testing machine. Readings were collected. Results: from the collected data the lateral obturation showed 85.25±104.901 µε and the vertical obturation showed 4.875±3.555 µε with significance difference of P<0.05 between the groups.Conclusion: it can be concluded that the abutments treated with vertical obturation techniques reduced the stresses induced to the supporting structures when compared with the lateral condensation technique.

Aim: Comparing the bacterial adherence and count on denture bases and underlying mucosa when using chrome-cobalt Co-Cr (Metal), Acetal and Polyether ether keton (PEEK) as denture base materials.Materials and Methods: 20 patients with mandibular Kennedy class III Mod. 1, opposing maxillary fully dentulous ridge were selected. Patients were divided into two groups 10 each. Group I: In a split mouth, patients received removable partial denture with chrome cobalt (Metal) denture base on one side and Acetal denture base on the other side. Group II: In a split mouth patients received chrome cobalt (Metal) denture base on one side and PEEK denture base on the other side. Swabs were taken from the fitting surface of dentures and the mucosa underlying the denture at 1 week, 2 weeks and 3 weeks after insertion. Incubation on blood agar for 24 hours at 37 degrees was done.

Aim: Aim of this study was the evaluate the retention and biting force of conventional complete denture and after placement of a single implant in the mandible for an implant retained over-denture Material and methods Eight completely edentulous patients were selected. A single implant was inserted at the symphysis of the mandible and left to osseointergrate. During the osseointegration period a conventional complete denture was fabricated and inserted. Retention and biting force was measured at insertion and after 3 months of service. After osseointegration attachment was connected, space was formed in the fitting surface of the existing mandibular denture and retention silicon was placed. Retention and biting force were measured at insertion and after 3 months follow-up. Data were collected and statistically analyzed. Results: The retention mean values for the complete denture was 2.420±0.360, however the retention mean values for the single implant over-denture was 6.395±0.289.  F=3.80 with statically significance difference between the groups of P <0.01. The biting force mean values for the complete denture was 52.62±2.71, however the biting force mean values for single implant over-denture was 71.45±2.73. F= 1.790 with statically insignificance difference between the groups of P >0.01 Conclusion: Single implant overdenture improved the retention and the biting force when compared with the complete denture, this has improved the quality of life and happiness.