Table 2. Study characteristics. Reference Study design Sample characteristics Age range (y); mean (y) Data collection period Country Patients (n) m/f (%) Extractions (n) Risk of bias* Chrysanthakopoulos, 2011a Prospective, cross-sectional (questionnaires and clinical examination) Mean number of 20 natural teeth, with good general health, who attended a private ...

Results In the beginning, 9982 studies were located: 96 in APA PsycINFO, 5208 in Embase, and 4678 in PubMed. 6038 studies were left after duplicates (3944) were eliminated. After screening titles and abstracts, 5916 research were eliminated, leaving 122 papers. These studies' reference lists were also examined for pertinent publications and unpublished papers. No other research was discovered. Fo...

Extracting and synthesizing data A narrative synthesis was carried out after taking into account the risk of bias of the included studies (e.g., how well the included studies addressed the review objectives and allowed for a quality assessment in terms of the quantity and kind of teeth extractions). This included examining the similarities and differences between the findings of t...

Selection and retrieval The flow diagram for the screening and selection technique is depicted in the figure. Two reviewers (DLMB, AdJ) and a librarian created the search keywords (Table 1). After duplicates were eliminated, two independent reviewers (DLMB, AdJ) conducted a preliminary assessment of the abstract and title. Until complete consensus was achieved, all variances were discussed. The t...