Objectives:The objective of this study was to make a radiographic and bite force comparison between stud and double telescopic crowns using two different attachment systems for two interforaminal mini implants retaining mandibular complete overdenture. Subjects and Materials: Randomized, controlled, clinical study was done on 20 completely edentulous patients, divided into 2 equal groups. The first group (study group), patients were treated by two mini-implants (with ball abutments) of 2.4mm diameters and 13mm lengths (in the canine regions) retaining mandibular overdentures and by conventional maxillary complete dentures. The second group (control group), patients were treated by two mini-implants (with square head abutments) of 2.4mm diameters and 13mm lengths (in the canine regions) retaining mandibular overdentures and by conventional maxillary complete dentures. Results: At the end of the 12 months, a total bone loss of 0.69 mm for group I (with ball abutments), and 1.64 mm for group II (with square head abutments) was detected. For Maximum Bite Force, there was no significant difference between the two groups at all follow-up periods. Conclusion: Mandibular overdentures retained by two mini implants is considered as an acceptable treatment modality over the one-year observation period. Ball attachments are more favorable than telescopic attachments, in regard to the reduction of the peri-implant bone loss, while, the type of the attachment has less effect on the maximum bite force.

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.

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