AIM: This randomised clinical study aimed to detect whether CMLOC attachment could improve Oral Health-Related Quality of Life (OHRQOL) when compared to ball attachment. METHODS: Eighty edentulous patients were recruited to receive a single symphyseal implant for mandibular overdenture, after three months, randomisation was done to divide them into two groups; Dalbo ball (control group) and Cendres and Metaux locator (CM-LOC) (intervention) attachments respectively, oral health impact profile for edentulous patients (OHIP-EDENT)questionnaire was recorded before implant placement, two weeks after pick up, at 3, 6, 9, and 12 months. RESULTS: Results revealed a lack of statistical significance between the two groups except for psychological discomfort at 2 weeks after pick-up (p-value = 0.029) CONCLUSION: Single implant overdenture is a simple, reliable treatment modality for treating edentulous mandible and both CM LOC and Ball attachments are good alternatives for such treatment modality.

Various invasive and non-invasive methods have been used for measuring primary implant stability. Periotest damping device, and resonance frequency analysis (RFA) with the Osstell device have been classified as non-invasive methods.In this clinical randomized trial, a general correlation of primary implant stability was recorded using both the Osstell and Periotest device at the day of implant installation and 3 month after healing for the submerged and non submerged   loading protocols. The gender of included patients were investigated in the correlation of the two devices.Eighty completely edentulous patients were recruited, all patients were of age ranging from 50 to 69 years old. A single implant was installed in the midline of the completely edentulous mandible to improve retention of their lower denture. After implant installation, Implant Stability was recorded using the osstel and periotest device. Patients were then randomized into two groups using sealed envelopes; Submerged (S), and Non Submerged (NS). All ISQ and PTV were recorded at the day of implant installation, and 3 month after healing for both groups.When the ISQ was correlated to the (PTV), there was a moderate negative statistically significant correlation between the two readings, correlation coefficient= -0.466, p=0.000 . There tends to be a weak negative correlation between the two devices in the male group ,while there tends to be no correlation between the two devices in the female group After 3 month healing, there was no statistically significant correlation of the readings with in both groups ;NS and S ; Correlation coefficient =-0.014, -0.430, p=0.942, 0.052 respectively.   A strong negative statistically significant correlation between the two devices for the female group for both, NS and the S group. While there was no statistically significant correlation with in the male group for both groups.The present study concluded that there is a significant negative correlation between the two devices when recording primary implant stability, while this significance is lost after 3 month of loading when recording secondary implant stability. Gender would affect the implant stability recording, this would mainly due to the difference in bone density between the male and female group.

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Objective. The aim of this randomized clinical trial was to compare the masticatory ability subjectively between ball and Cendres+Métaux Locator (CM-LOC) attachment for a single implant retained mandibular overdenture throughout a 24-month follow-up period. Materials and Methods. Eighty completely edentulous patients were recruited. All patients received new complete dentures, and masticatory ability was recorded using a questionnaire (baseline record). All patients received a single implant in the midline of the completely edentulous mandible. After 3-month healing period, patients were randomized using sealed envelopes into two groups: ball or CM-LOC attachment. The same masticatory ability questionnaire was used to record masticatory ability for both groups after 2 weeks of pickup and 3-, 6-, 9-, 12-, and 24-month follow-up. Comparison between the study groups was done using Mann–Whitney U test for independent samples. Two-sided P values less than 0.05 were considered statistically significant. Results. The mean masticatory scores improved for both attachments, with no statistically significant difference between them throughout the 24-month follow-up. The CM-LOC attachment group showed a greater improvement change in masticatory ability after 6- and 12-month follow-up (−12.47 ± 12.006, −11.46 ± 14.625; P = 0.826 ), while the ball attachment group showed a slight improvement after the 24-month follow-up (−11.72 ± 12.368, −10.88 ± 11.963; P = 0.778 ). Conclusion. Single implant retained mandibular overdenture improved masticatory ability subjectively with no significant difference between both attachments used although the ball attachment showed better masticatory ability scores after 24-month follow-up.

Purpose: This in vitro study was conducted to evaluate the effect of Pekkton and zirconia primary crowns on the stresses induced on the supporting structures of Pekkton telescopic retained mandibular partial denture using strain gauge stress analysis method Material and methods: This study was applied on a mandibular Kennedy class I scanned educational model. The second premolars bilaterally were the last abutments. In Excad software, designing and preparing the four abutments (the first and second premolars bilaterally) was done to receive primary coping of telescopic partial denture. The modified virtual model was 3D printed using model resin to obtain two identical 3 D casts Thus, two groups were defined according to the material of primary coping: Group (1): (PEKK) -Pekkton® RPD frameworks were constructed on (PEKK) -Pekkton® primary crowns. Group (2): (PEKK) -Pekkton® RPD frameworks were constructed on Zirconia primary crowns. The STL file was imported into the 3D system. The STL file was sent to the milling machine. Eight primary crowns from Pekkton and zirconia were fabricated (Four for each group). Designing and milling of The telescopic Pekkton partial denture framework including secondary coping were done .For each cast, four strain gauge sensors were placed and a universal testing machine LD Series were used to apply a static load of 100N bilaterally at the second molar and distal the last abutment then unilaterally on the right side. The arithmetic mean and the standard deviation of the recorded readings (micro strain) of each loading point were calculated tabulated and statistically analyzed. Result:The result of this in-vitro study revealed that under bilateral loading, the mean values of the stresses found distally to the last abutment and in second molar area for group 1(Pekkton primary crown) were (124.70), (49.00) respectively while in group 2 (zirconia primary crown) the mean values were (347.10), (79.30) and the results showed statistically significance difference. During unilateral loading, the results showed higher strain values on the predetermined site in group 2 than group 1, and the calculated values were statistically significance. Conclusion:In telescopic RPDs, Zirconia induces higher strain values at the abutments and the distal aspect of the ridge than Pekkton during bilateral and unilateral loading.