ObjectivesThe aim of this study was to analyse the course of the canalis sinuosus (CS) until its termination in the anterior maxilla and chart its anatomical relationship with surrounding structures using cone beam computed tomography (CBCT).MethodsThis study retrospectively analysed 100 CBCT scans (Accuitomo 170, Morita Corp., Kyoto, Japan) of the maxillary sinuses of patients at the Department of Oral Surgery and Stomatology, School of Dental Medicine, University of Bern. Vertical and horizontal distances between various anatomical structures and the CS were recorded.ResultsThe study included 62 females and 38 males with 45 right‐ and 55 left‐sided CBCTs selected by randomization. The mean age was 55.9 years (range 21–82 years). When comparing right‐ and left‐sided scans, there were statistically significant differences between a number of measurements. These included the most inferior point of the orbital rim and the floor of the nasal cavity (P = 0.04), the origin of the CS and the anterior loop of the descending CS (P = 0.034), and the origin of the CS and floor of the nasal cavity (P = 0.025).ConclusionsThe use of CBCT allowed investigation of the course of the CS as it progresses across the anterolateral wall of the maxillary sinus to be more accurately defined radiographically than has been previously described. There were some statistically significant differences between vertical measurements comparing left and right side, but none for age or gender. The rate of the identification of the CS using CBCT was 100%.

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Objective To assess the clinical performance of tooth implant–supported removable partial dentures in terms of abutment survival in relation to the attachment system used. Methods An electronic search in MEDLINE/PubMed Web of Science and Cochrane Central Register of Controlled Trials databases was performed. The methodological quality of the studies was assessed using the Newcastle–Ottawa Scale. Survival rates after 3 years and 5 years, loss, and complication rates per 100 years were estimated by Poisson regression. Results A total of twelve studies were included; eleven studies were used for the meta-analysis. Survival analysis for mixed attachments showed an estimated survival rate of 100% after 3 years and 5 years. For uniform attachments, the estimated survival rate was 99.3% after 3 years and 98.8% after 5 years. Tooth abutment survival analysis for mixed attachments estimated a survival rate of 95% after 3 years and 91.7% after 5 years: Uniform attachments reached a survival rate of 97.2% after 3 years and 95.4% after 5 years. The prosthetic survival rate was 100% for mixed and uniform abutments after 3 years and 5 years of function. Conclusions Tooth implant–supported removable partial dentures can be considered as a reliable option with excellent prosthetic and implant survival rates and favorable rates for the abutments after 3-year and 5-year follow-ups. Complications may be reduced when 5 or more abutments are used. Clinical relevance Tooth implant–supported removable partial dentures are a favorable and potential alternative to restore a partially edentulous arch by optimizing the number and distribution of abutments.

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