A-12 Racial Differences in Performance Validity Test Failure Rates

Objective Embedded performance validity tests (PVTs) may show increased false positive rates in racially diverse examinees. This study examined false positive rates by race in an older adult sample. Method The project involved secondary analysis of a deidentified dataset (N = 22,688) from the National Alzheimer’s Coordinating Center (NACC). Participants were included if their identified race was African American or white. Exclusion criteria included diagnosis of mild cognitive impairment (MCI; n = 5160) or dementia (n = 5550). The initial sample included 11,114 participants grouped as cognitively normal (89.9%) or impaired but not MCI of whom 16.4% identified as African American. Propensity score matching was conducted by diagnostic group to match African American and white participants on age, education, gender, and MMSE score. The final sample included 3024 and 482 participants in normal and impaired groups, respectively, with 50% of participants identifying as African American in each group. Failure rates on five embedded PVTs in the NACC cognitive test battery were examined by race and by diagnosis. Results Age, education, gender, and MMSE score were not significantly different by race in either diagnostic group. In the normal group, 4.7% of African American and 1.9% of white participants failed two or more PVTs (p < 0.001). In the impaired group, 9.5% of African American and 5.8% of white participants failed two or more PVTs (n.s.). Conclusions PVT failure rates were significantly higher among African American participants in the normal group but not in the impaired group. Failure rates remained below a common false positive threshold of 10%.

Maxillary Implant-Supported Overdentures: Mechanical Behavior Comparing Individual Axial and Bar Retention Systems. A Cohort Study of Edentulous Patients

Background and objectives: To compare the medium- to long-term mechanical behavior of overdentures with two different retention systems: overdentures with Locator® axial retention, and vertical insertion overdentures with bar retention, used to rehabilitate edentulous maxillar. Material and Methods: This prospective study assessed patients presenting complete maxillary edentulism, rehabilitated by means of implant-supported overdentures (n = 20), 10 with Locator® axial retention (ODA group) and 10 with overdentures on bars (ODB group). Patients also completed a questionnaire to determine their satisfaction with treatment. Results: The mean follow-up time in both groups was 11.4 years, with follow-up times in both groups ranging from 5 to 14 years. The ODA group suffered mechanical complications such as retention loss, need for nylon retention insert changes, resin fracture, and need for relining. In the ODB group, prosthetic dental wear, screw loosening, and complete prosthetic failure were more common. A total of 19 implants failed (23.8%); of these, 11 were in the ODA group (failure rate = 27.5%) and eight in the ODB group (failure rate = 20%). The patient satisfaction questionnaire obtained a mean score of 7.9 out of 10 in the ODA group, and 9.75 in the ODB group. Conclusions: in rehabilitations of edentulous maxillar by means of implant-supported overdentures, both the systems assessed were shown to be effective in the medium to long term. Patients expressed a high level of satisfaction with the treatments received.