Objective: This study was conducted to compare the retention of the mandibular implant-supported overdenture with OT Equator and mini ball and socket attachments (nucleoss, menderes ,izmir , Turkiye ). Subjects and Methods: From the removable prosthodontics department clinic, Faculty of Dental Medicine, (Boys, Cairo), Al-Azhar University, ten completely edentulous patients were randomly chosen. The patients were divided into two groups, group I received two implant-supported overdenture with OT Equator attachment while group II received two implant-supported overdenture with mini ball and socket attachment. The retention was measured using a digital force gauge at the time of attachment connection(T1), after six months(T2), and after twelve months(T3). Statistical analysis was done using SPSS software version 20.0. Data distribution of normality was done by using the shapiro-wilk test. Student t-test was used for comparing the means of two groups. Paired t-test was used for comparison between T1, T2, and T3. Results: It was found that group I recorded significantly higher values of retention than group II and there was a gradual loss of retention values in the two groups. Conclusion: OT Equator attachment is significantly more retentive than mini ball attachment.
Aim: This clinical study was conducted to evaluate the effect of using different denture base material on masticatory efficiency in implant supported complete mandibular overdenture. Subjects and methods: Twelve completely edentulous patients were selected for this study according to inclusion and exclusion criteria that affect implant success or masticatory system. History taking, clinical, and radiographic evaluation were done for each patient. Preoperative cone beam computerized tomography (CBCT) was done for each to determine bone height and width. Each patient received two implants in the inter-foraminal area of mandible, three months later lower denture was converted into mandibular overdenture. Patients were grouped in two groups Group I: patients were received a complete mandibular overdenture constructed of conventional heat cured acrylic resin denture base. Group II: patients were received a complete mandibular overdenture constructed of flexible denture base material (polyamide). Evaluation of masticatory efficiency were done for each group by calculating chewing numbers and times. All evaluations were done at the time of implant placement, three months, six months, twelve, eighteen and twenty-four months of implant placement. One-way ANOVA with post hoc turkey test was used for multiple time comparison. Results: The chewing number and times was non-significant between the two groups. Conclusion: The denture base has no effect on masticatory efficiency of mandibular implant supported overdentures.
Objective:The object of this in vitro study was to evaluate retention and stress distribution of implant retained mandibular complete overdenture with locator versus ball and socket attachments. Materials and Methods: Mandibular experimental acrylic model and dentures were constructed in the laboratory of removable prosthodontic department, faculty of dental medicine, Cairo, boys, Al-Azhar University. Two implants were placed in the corresponding canine areas of the models then dentures were attached to the implants by one of the studied attachment systems (Locator and Ball and socket). Models with dentures were divided in to two groups according to the attachment system; (group I) overdenture with ball/socket attachment, and (group II) overdenture with locator attachment. Retention was evaluated using universal testing machine and stress distribution was evaluated using strain gauge. Results: The results of the present study revealed that (group II) exhibited a statistically significant higher retention when compared with (group I). While (group II) exhibited better but non-significant stress distribution when compared to (group I) bilaterally and unilaterally. Conclusion: Locator attachment system could provide better retention and stress distribution for implant retained mandibular complete overdenture.
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