A scoping review was opted for instead of a systematic review, as the aim of this study was to identify knowledge gaps, map out a body of literature, clarify concepts, or explore research methodologies.(32, 33) Unlike systematic reviews, which typically synthesize existing evidence on relationships between exposure and outcome variables, scoping reviews are designed to map the breadth and depth of research activity on complex topics and identify gaps in the relevant literature.(34) In this scoping review, we employed the five-stage framework proposed by Arksey and O’Malley (34), which includes (1) identifying the research questions, (2) identifying relevant studies, (3) selecting the relevant studies, (4) charting the data, and (5) collating, summarizing, and reporting the results. This approach enabled our study to make significant contributions by providing a comprehensive and explicit summary of the available evidence on LA, SRL and SDL among undergraduate dental students.
2.3.1 Study Selection
The results of the literature search and study selection are depicted in the flowchart (Fig. 2). The selection process followed the methods of identification, screening, eligibility, and inclusion as described by Liberati et al.(38) Initially, the review focused on titles and keywords or topics retrieved from the five databases to keep the results manageable. The initial search yielded 1,064 articles. After 259 duplicates were eliminated, 805 articles were further screened. The following criteria were used for the review and selection of studies: availability in English and focus on SRL, SDL, and LA in undergraduate dental education. Articles that reported undergraduate dental student data when students from other programs (e.g., medical students, nursing, pharmacy, postgraduate students) were also involved in the study were included (39–45). Other scoping and systematic review papers on SRL and SDL in medical education were not further analyzed because of their limited information on dental education. Therefore, these literature review papers served solely as tools for reference list checking. The first author (NG) screened the titles and abstracts for relevance to the research questions, leading to the exclusion of 690 articles that did not meet the inclusion criteria. This included studies with irrelevant titles, keywords, and abstracts from other health professional fields not related to dental education, as well as systematic reviews and conceptual papers. The selection process was conducted twice to ensure that no relevant publications were mistakenly excluded. A full-text screening was subsequently conducted for 115 articles, and a total of 45 studies were selected for further open-coding analysis. This was followed by a full-text analysis in which another 21 articles were removed specifically for not identifying the components of LA. Given that electronic searches may miss significant published studies due to indexing limitations, errors, inaccuracies, or concepts lacking appropriate subject headings, we supplemented our search by manually (36)examining the reference lists of the remaining 24 studies and relevant systematic/scoping reviews, and an additional 9 relevant journal articles were added. Finally, 33 articles were included in the qualitative analysis. Consensus was maintained throughout the article selection process, ensuring consistency in the identification of LA themes. A codebook encompassing LA themes and references was established, and participant information was extracted by the first author.
2.4. Step 4: Data Charting and Coding Process
Data charting was carried out via Microsoft Excel, and a codebook was developed to ensure consistency in data extraction. This enabled the capture of essential data items, as outlined in Table 2. The data items extracted during charting included the author’s name, year of publication, source, type, country, research method, theories and analytical framework, participants, context, and LA themes. The extraction was performed by the first author, NG.
The auditing process involved a second reviewer (DJ), applying a thematic approach combined with open coding and referring to the provided codebook for extraction. This step was undertaken to ensure validity. Interrater reliability (IRR) was also assessed on a subset of 10% of the studies in this phase, with the IRR results showing an acceptance rate of over 0.85 for each theme. Each coder independently extracted data to a codebook using the same criteria. The second coder was blinded to the data provided by the first author. The results were based on LA themes extracted from the data. The characteristics of the included studies are as follows:
2.4.1. Sources of publication
The review encompassed various journals, with the European Journal of Dental Education being the most frequently cited, contributing eight articles. The Journal of Dental Education followed with five articles, whereas BMC Medical Education provided three. Other journals included the Journal of Clinical and Experimental Dentistry, the Journal of Education and Health Promotion, and Acta Odontológica Latinoamericana, each with two articles. Several journals were represented by a single article each: Medical Education, Pakistan Orthodontic Journal, Canadian Medical Education Journal, African Journal of Health Professions Education, Professional Medical Journal, Journal of Medical Education and Curricular Development, Academic Bulletin of Mental Health, Journal of Medical internet Research, Tidsskriftet Læring og Medier and Frontiers in Psychology. This wide range of sources reflects the interdisciplinary interest and comprehensive examination of the topic across different fields and regions.
2.4.2. Country
Given the diverse educational contexts across various countries, contextual factors, such as the study setting, were considered crucial aspects in reporting the findings (46). All the studies provided information on their respective study settings, which were distributed as follows: 9.3% in the U.S. and Korea; 12.5% in Pakistan; and 6.25% each in Australia, Syria, Chile, Qatar, and Saudi Arabia. The remaining studies were conducted in India, Belgium, Brazil, the UK, the Philippines, Denmark, Canada, Malaysia, Argentina, Turkey and Finland.
2.4.3. Year of publication
Although the search for articles spanned from 1994–2024 (Fig. 3), the first paper related to SRL/SDL/LA in undergraduate dental education appeared in 2003, indicating that these topics have gained popularity only in the last two decades. Interest in the subject grew significantly after 2016, reaching its peak in 2022.
2.4.4. Theories and analytical framework
The theories and analytical framework were specified in 26 out of 33 articles. Several studies have used multiple theories or models in their study design and analyses and can be categorized as follows: (1) active learning theories (e.g., problem-based learning (PBL), experiential learning) (n = 6); (2) theories related to SRL (n = 10); (3) self-directed learning (SDL) (n = 4); (4) theoretical models (e.g., theories on transitional psychology or organizational socialization theory, self-determination theory, assimilation theory of meaningful learning, sense of coherence) (n = 4); and (6) other theories (e.g., facets of reflective thinking, transaction distance theory) (n = 2). SRL was the most frequently employed, indicating that in discussions about learner agency, the behavioral dimensions in dental education are the most explored.
2.4.5. Research methods
Across the 33 studies investigating LA, SRL, and SDL, a wide array of research methodologies is apparent, showcasing diverse approaches to comprehending these concepts. Quantitative methods predominated, with 20 studies employing numerical data and statistical analysis to explore these educational phenomena. These studies used various approaches, including self-reported and self-evaluated questionnaires(42, 47–50), pre- and post-course questionnaires (20), and cross-sectional surveys/studies(44, 51–53). Some studies have employed descriptive statistics (40, 54–57). For example, Loka SR et al. (49) used a reflection questionnaire to assess habitual action, understanding, reflection, and critical reflection on a 5-point Likert scale. Orsini C et al. (58) conducted a longitudinal study collecting data on demographics and students’ motivation for attending university, measured through the 28-item Academic Motivation Scale (AMS). Lan M et al. (43) utilized a massive open online course (MOOC) and quantitatively analyzed data via k-means clustering to identify five SRL behavioral indicators of student activity. Notably, Alfakhry G et al. conducted quantitative studies via a quasi-experimental study design.(59, 60)
In contrast, six qualitative studies focused on in-depth exploration of SRL via focus group discussions and semi structured interviews. These include studies by Ali K et al.(61), Bowman (62), Orsini C et al. (63), Postma TC. (64), Farrukh et al. (45), and Varthis S et al. (65). For example, in the qualitative study by Varthis et al.,(65) students responded to an online questionnaire followed by a group discussion aimed at problem solving before and after the blended learning experience.
Furthermore, mixed-methods studies, numbering six, combined qualitative approaches such as interviews and focus group discussions with quantitative approaches such as surveys, questionnaires, and pre- and posttests. These studies include those of Malau-Aduli BS et al. (66), Mehboob et al. (41), Premkumar K et al. (67), Rung et al. (68), Alvarez S et al. (69), and Lee M et al. (70). For example, Lee M et al. (70) utilized qualitative analysis alongside a cross-sectional web-based survey, whereas Malau-Aduli (66) employed quantitative analysis of survey data via descriptive statistics and thematic analysis guided by the conceptual framework of organizational socialization theory (OST).
2.5. Step 5: Collating, summarizing, and reporting the results
The mapping results and information were gathered, summarized, and reported. Key themes were identified and consolidated to integrate and synthesize the literature, facilitating a clear and concise interpretation of the findings.