The research team, based at the University of Magdeburg, set out to disentangle two dimensions of simulation design that are frequently bundled together under the vague umbrella term of “realism.” The first is visual fidelity, or VF, which encompasses the geometric detail, textures, lighting, and overall richness of what the user sees. The second is interaction fidelity, or IF, which concerns how closely the way a user acts within the simulation corresponds to the way they would act in the real procedure, including the physical instruments they hold and the tactile feedback those instruments provide. Drawing on Bonfert and colleagues’ Interaction Fidelity Model, the authors treat fidelity as a multidimensional design property rather than a single slider of realism, distinguishing what users perceive visually from how users can act within the simulation. This conceptual separation allowed them to design a controlled experiment in which each dimension could be switched independently between high and low settings, something rarely done in prior work that has tended to focus almost exclusively on visual factors.

The task at the heart of the study was a guided needle insertion, a procedure representative of image-guided, minimally invasive interventions such as biopsies and percutaneous therapies. Rather than reproducing an entire clinical workflow, the researchers distilled the scenario into three sequential sub-tasks of escalating precision: moving an instrument table into the interventional workspace, disinfecting a laser-marked puncture site on a patient model, and finally inserting a needle toward a predefined anatomical target at a specified angle and depth. Only the third sub-task, the needle insertion itself, was used for performance analysis, since the first two serve primarily as low-precision warm-up activities that familiarize participants with the environment and the tools. A laser-based navigation aid, inspired by commercial systems such as ATLAS, indicated the puncture site and insertion angle, while a stopper on the needle shaft enforced the target depth across all conditions.

The experimental environment was a hybrid one, blending virtual content rendered through a head-mounted display with real, physically tracked objects. Participants wore a Valve Index head-mounted display fitted with an Ultraleap Leap Motion Controller 2 for markerless hand tracking, and tangible instruments, including the needle and the instrument table, were tracked in six degrees of freedom using HTC Vive Trackers 3.0, spatially registered to their virtual counterparts. The physical centerpiece of the setup was an MRI scanner mock-up that anchored the virtual interventional room. In the tangible interaction conditions, a candle gel phantom was aligned with the virtual patient anatomy so that participants could feel the puncture surface as they worked. In the virtual interaction conditions, by contrast, everything was done mid-air: tissue resistance was approximated with a simplified physics-based model, depth was detected via raycasting, and beyond four centimeters of insertion, progressive constraints gently pulled the needle tip back toward its original trajectory, a so-called rubber band effect that mimicked the growing resistance of deeper tissue layers. The simulation was built in Unity using the High Definition Render Pipeline, running on a workstation equipped with an AMD Ryzen 9 5950X processor and an NVIDIA GeForce RTX 3090 graphics card.

The high visual fidelity condition featured high-polygon models, realistic textures, dynamic lighting, and a fully furnished environment, while the low fidelity condition reduced everything to simplified geometry, monochrome surfaces, minimal shading, and an absence of props, deliberately evoking the look of a low-effort prototype. A fifth condition, a non-immersive baseline in which participants performed the same tasks on the physical setup without a head-mounted display, served as a real-world reference point. Thirty-one medical students, aged 19 to 33, completed the study, recruited exclusively from the human medicine program to guarantee basic familiarity with clinical environments. The sample size yielded a statistical power of 0.91 for detecting medium effects. Each participant experienced every condition in a counterbalanced order determined by a double Latin square design, completing four repetitions of the task per condition, with the first serving as training and the remaining three feeding into the analysis.

Performance was measured with clinical precision. Task completion time ran from the moment the needle was picked up to an acoustic stop signal, at which point the final needle pose was recorded. Accuracy was decomposed into positioning error, alignment error, and depth error, capturing distinct stages of the insertion process. Subjective experience was assessed with standardized instruments: the raw NASA Task Load Index for workload, the short User Experience Questionnaire for overall experience, and the igroup Presence Questionnaire for presence and its sub-scales, including spatial presence, involvement, and perceived realism. The study received ethical approval from the university ethics board and adhered to the Declaration of Helsinki.

The results tell a clear story with a twist. On the performance side, interaction fidelity was the star. Tangible interaction produced significantly shorter task completion times than virtual interaction, with a robust statistical effect, and dramatically lower needle alignment errors, one of the strongest effects in the entire study. Depth control also improved with tangible tools. Visual fidelity, by contrast, showed no significant effect on any of these performance metrics, and Bayesian analyses provided moderate evidence in favor of the null hypothesis, suggesting that the lack of visual effects was not merely a failure to detect a small signal. Intriguingly, the researchers found small but significant interaction effects between the two fidelity dimensions on both task completion time and alignment error: the performance advantage of tangible interaction was larger when the visual environment was sparse. In other words, realistic physical tools can partially compensate for a visually barren simulation, particularly when it comes to how quickly and how accurately trainees work.

On the subjective side, the picture reversed. High visual fidelity did exactly what one would expect: it significantly increased spatial presence, involvement, and perceived realism, the psychological ingredients of the sensation of being there. Tangible interaction also boosted perceived realism, but its most consistent subjective benefits were elsewhere, reducing perceived workload and enhancing user experience. Participants overwhelmingly preferred the combination of high visual fidelity and tangible tools, and their intuitions aligned with the data in one respect: 90 percent reported that the interaction modality had a noticeable impact on task performance, compared to only 68 percent who said the same about visual fidelity. The non-immersive baseline, analyzed descriptively, reminded readers that real physical practice remains a reference point that immersive systems have yet to fully surpass.

The authors are careful to frame these findings not as a rejection of visual realism but as a call for purposeful design. If the goal of a simulation is to sharpen procedural accuracy and efficiency in a precision-critical task, their data suggest that investment in tangible, tracked instruments and genuine haptic surfaces will pay off more than investment in photorealistic rendering. If, however, the goal is to create a convincing, engaging experience that increases immersion and involvement, as might be desirable for orientation training or patient education, then visual fidelity is the lever that matters. The interaction effects add a further nuance: tangible tools appear to offer their greatest marginal benefit precisely when visual resources are limited, hinting that resource-constrained training programs, perhaps in settings where high-end graphics hardware is unavailable, can still deliver effective procedural practice by prioritizing physical interaction over visual polish.

The study also addresses a persistent methodological problem in the field. Fidelity-related design choices in medical MR research are often poorly documented, making studies difficult to compare or replicate. By explicitly operationalizing visual and interaction fidelity, reporting their implementation details, and publishing the work open access, the team has provided a template for how future fidelity research might be conducted. The limitations are acknowledged as well: participants were medical students rather than practicing clinicians, the needle path was predefined and guided rather than freely planned, and a single registration drift issue forced the exclusion of positioning error from the analysis. Whether the findings generalize to unguided insertions, to experienced interventionalists, or to entirely different procedural domains remains an open question.

Still, the central message is likely to resonate far beyond this single experiment. As virtual and mixed reality flood into surgical education, procurement decisions are often driven by demo-day impressions of visual spectacle. This study provides some of the strongest controlled evidence yet that the hand, not just the eye, is the critical pathway to procedural skill, and that the sense of realism a trainee feels and the skills a trainee acquires are governed by separable design choices. For a field that has spent years chasing photorealism, the most realistic thing a simulation can offer may simply be something real to hold.

The stakes are far from academic. Medication errors contribute to avoidable patient morbidity and mortality worldwide, and analyses suggest that up to 0.7 percent of global health expenditure could be saved if such errors were prevented. Studies of recently graduated doctors have repeatedly traced prescribing mistakes to a single root cause: gaps in pharmacological knowledge. The virtual journey was built to attack one particularly consequential misconception. When a drug is swallowed, it is absorbed from the gastrointestinal tract into the portal circulation and must pass through the liver before reaching the rest of the body — a phenomenon known as first-pass metabolism that can dramatically reduce the fraction of the administered dose that actually reaches the bloodstream, a quantity pharmacologists call bioavailability. Morphine is a classic example: extensive hepatic metabolism cuts its oral bioavailability to roughly 30 percent. A clinician who assumes that oral and intravenous doses are interchangeable might prescribe an oral dose far too low to control pain, or administer an unadjusted intravenous dose and push a patient into sedation and respiratory depression. Making that invisible chemistry visible, the team hypothesized, could close exactly this kind of gap.

The animation itself is a small marvel of educational engineering. Viewed through head-mounted displays such as the Meta Quest 2 and 3, or the Pico 2 used at the Norwegian site, the 360-degree video carries viewers through every anatomical checkpoint of oral drug delivery: dissolution in the gastrointestinal tract, absorption across the intestinal epithelium, transit through the portal vein, first-pass metabolism in the liver, and eventual arrival in systemic circulation. Unlike fully interactive VR games, the experience is deliberately cinematic. Students can pause and rewind the film, but they cannot manipulate objects inside it, and an English voice-over narrates the pharmacological events as they unfold. That restraint was a design choice: the team wanted to evaluate whether even a passive, non-interactive VR animation could add value to a subject traditionally taught through classroom lectures and textbook diagrams. Notably, preliminary testing showed that moving from Meta Quest 1 to Quest 3 headsets reduced dizziness and nausea — a sign that consumer VR hardware is maturing just as educators begin to lean on it.

To test the concept, the researchers ran a sequential mixed-methods study spanning the University of Bergen in Norway, the University of Leeds in the United Kingdom, the University of Turku in Finland, the University of Otago in New Zealand, and the University of New South Wales in Australia. Participants were students of medicine, biomedicine, and pharmaceutical sciences who had already completed a basic pharmacology course, ensuring the animation was probing perception rather than delivering wholly novel content. Immediately after each six-minute session, students completed an online questionnaire combining the ten-item System Usability Scale — a validated instrument scored out of 100 — with Likert-scale statements about motivation, engagement, and understanding, plus open-ended comments. At Bergen, the team dug deeper: thirteen third-year medical students from a cohort of 190 volunteered for focus group interviews lasting 60 to 90 minutes. The interviews were recorded, transcribed verbatim, and analyzed using Braun and Clarke’s reflexive thematic analysis, an inductive, interpretive approach in which researchers read and code transcripts repeatedly and refine candidate themes through collaborative discussion rather than chasing mechanical coder agreement.

The numbers told a consistent story. Of 132 respondents to the key item, 49 percent reported that the animation changed their understanding of drug absorption, and 62 percent agreed or strongly agreed that it made them think differently about the topic. Attitudes toward the technology itself were strikingly warm: 120 of 132 respondents agreed that VR can help them grasp complex pharmacological concepts more easily, and only three students declined to endorse the claim that VR can make learning more engaging. The mean System Usability Score landed at 80 — rated “good” on the scale’s published benchmarks — with every single study site clearing the threshold of 70 considered acceptable. Free-text comments captured the visceral quality of the experience: “It made me realize how connected the organs are,” one student wrote, while another praised “watching the drug move between different chambers of the body” and learning “the order of locations for the drug to travel to.” There was a physical cost, however: about a third of participants reported minor discomfort — a heavy headset, dizziness, or motion sickness, a phenomenon known as cybersickness — though almost none abandoned the session.

The focus groups revealed something the questionnaire could not. The first theme to emerge was integration: students described a curriculum that arrives “in chunks,” with anatomy, physiology, chemistry, and pathology delivered as disconnected silos, and pharmacology too often floating free of its foundations. Watching the tablet fragment into countless particles and traverse organ after organ gave many their first visceral sense of pharmacology as a bridge discipline. “You get a different perspective,” one student reflected. “You see things that you don’t necessarily think about happening.” The finding maps onto the cognitive-affective model of immersive learning, known as CAMIL, in which virtual reality offers two fundamental affordances: a sense of presence, the feeling of “being there” generated by immersion, and a sense of agency, the feeling of generating and controlling one’s own actions. Both feed into motivation, self-efficacy, self-regulation, and cognitive load. The animation scored high on presence but low on agency, because viewers were locked into a fixed, pre-scripted narrative. The authors argue that future versions should hand students the controls — letting them choose where to travel inside the body and what to inspect along the way.

The second theme was a tension every multimedia designer will recognize: engagement versus overload. Students loved the immersion but struggled to process the dense voice-over and the visuals simultaneously. “Goodness, is it me who can’t do two things at the same time; listen and see,” one wondered. Another admitted losing track of her location inside the body and wished for subtitles. According to Mayer’s cognitive theory of multimedia learning, verbal and visual information travel through separate but capacity-limited channels, and effective learning requires filtering, organizing, and integrating those inputs with prior knowledge — a budget that shrinks further when the narration arrives in a second language, as it did for a substantial share of these international students. Mayer’s coherence principle, which warns against superfluous information, may matter even more inside a headset than in a lecture hall. The students’ wishlist read like an applied multimedia textbook: optional subtitles and clickable text boxes, name tags on anatomical structures, embedded quizzes, gamification, a navigation indicator showing where in the body the viewer currently stands, and — overwhelmingly — less narration competing with the imagery for attention.

The third theme was the most sobering for educational reformers. Even students who found the animation transformative explained that their learning is governed by assessment. “It’s all about time; I’m aiming for the most efficient ways to learn,” one said, noting that a single textbook chapter consumes three hours that a packed curriculum cannot spare. With practical examinations such as the objective structured clinical examination looming, students consciously optimize for what will be tested, sometimes sacrificing the deep conceptual understanding they genuinely want. “I do want to become a good doctor,” one insisted. Educational research supports their dilemma: students predictably prioritize material they expect to be assessed on, formative assessments tend to promote deeper learning, and summative examinations tend to reinforce surface strategies such as memorization. The implication is uncomfortable — a dazzling VR module bolted onto an unchanged curriculum risks fading into a novelty. For immersive technology to earn a permanent place in pharmacology, the authors argue, it must be woven into teaching and assessment design, with formative, process-oriented tasks that channel the initial enthusiasm of a “wow factor” toward durable, applicable knowledge.

The team is candid about the limits of this pilot. Participation was voluntary, plausibly skewing the sample toward tech enthusiasts whose usability ratings may exceed the student average; the five sites differed in hardware, curricula, year of study, timing of prior pharmacology instruction, and language context; the qualitative strand drew from a single institution; and self-reports may carry social desirability bias, particularly at the home university of the developers. A novelty effect may also have inflated early enthusiasm. Nor did the study measure whether changed perceptions translated into better examination performance or, ultimately, safer prescribing — the outcome that matters most. What the research does establish is proof of concept with unusual breadth: a multi-institution, international evaluation showing that even a passive 360-degree animation moves the needle on perceived understanding of a concept known to trip up novices and professionals alike. The next generation of tools, the authors suggest, should be interactive, self-paced, and personalized — with artificial intelligence offering a route to adapt language, pacing, and content to individual learners in real time.

The broader vision is experiential pharmacology: a generation of clinicians who have, in effect, accompanied a drug through the body before they ever write a prescription. If conceptual misunderstandings about absorption and bioavailability underlie real medication errors — and the evidence says they do — then an educational tool that converts half a class of already-trained students from uncertainty to clarity in six minutes deserves serious attention. The message emerging from Bergen, Leeds, Turku, Otago, and Sydney is not that virtual reality will replace lectures and textbooks, but that seeing is a form of understanding, and some of medicine’s most consequential ideas are precisely the ones the naked eye can never see. The task ahead is to give students agency inside that microscopic world without drowning them in it. It is a design challenge — but one whose payoff could ultimately be measured not in questionnaire scores, but in prescriptions written correctly and patients kept safe.

The study, published in BMC Medical Education, documents the development and deployment of this VR platform aimed at inlay tooth preparation. It meticulously outlines how this pioneering technology integrates multiple educational facets, ensuring that students gain not just technical knowledge but also practical skills that are crucial for their future professional endeavors. With VR, students can manipulate virtual dental tools, visualize the anatomy of the tooth, and understand the implications of each movement and decision they make in a simulated setting.

Furthermore, the study presents comparative analyses between traditional teaching methods and the immersive experiences offered by VR. Traditional dental education often relies heavily on the use of models and simulation on patients, which can sometimes be limiting. In contrast, the VR platform enables students to repeat procedures without the constraints posed by raw materials or time. Imagine a classroom where students can spend hours perfecting their technique without the fear of wasting resources or making irreversible mistakes – this is the transformative promise of VR.

The platform not only fosters skill acquisition but also promotes a deeper understanding of the procedural steps involved in inlay preparation. Through gamification elements incorporated into the VR experience, students are engaged in a manner that is both educational and enjoyable. This dual approach enhances retention of knowledge and skills, as learners are more likely to remember experiences that they found stimulating and rewarding. This paradigm shift in learning encourages not just passive absorption of information but also active participation in the educational process.

In addition to its pedagogical benefits, the study indicates that the VR platform may also play a significant role in assessment and competency evaluation. In traditional settings, educators often face challenges in measuring the skill levels of students accurately. However, the VR platform allows for quantitative and qualitative assessments, capturing detailed metrics of student performance. This affords educators more precise insights into individual progress and skill mastery, making it easier to tailor educational approaches to the needs of each student.

Moreover, the incorporation of VR into dental curricula could lead to a significant reduction in educational costs over time. By minimizing dependence on physical models and materials, institutions may find that they can allocate resources more effectively. This potential for cost reduction, paired with the improved learning outcomes, positions the VR platform as a sustainable option in the future of dental education.

Importantly, as the study suggests, the use of VR in dental education aligns with the broader trends in medical training. The integration of simulation technology across various healthcare fields illustrates a commitment to improving patient safety and care. By better preparing future dentists through enhanced educational methodologies, the field is taking steps toward ensuring that practitioners are not only competent but also confident in their abilities to deliver high-quality care.

The results from this research will likely spark further interest and investment in VR technologies within educational institutions worldwide. As the technology becomes more accessible and refined, we may see a ripple effect as other disciplines within healthcare adopt similar platforms for training future professionals. The implications are vast; improved training methodologies could ultimately lead to better healthcare outcomes for patients.

However, the challenge lies in ensuring that all students have equal access to this advanced technology. Issues related to the cost of VR equipment and the need for adequate technical support remain critical barriers that must be addressed. Educational stakeholders must work collaboratively to ensure that VR tools are integrated across diverse learning environments, particularly in under-resourced areas.

In conclusion, the study conducted by Sun et al. paves the way for a revolution in dental education. The enhanced engagement, skills mastery, and potential cost benefits of a VR-based learning platform signify an important leap forward. As the field moves towards embracing these technological advancements, the future of dental education is set to be more dynamic, effective, and inclusive, redefining how aspiring dentists learn and prepare for their careers.

The research illustrates that VR in dental education is not just a passing trend; it is a genuine evolution that could reshape the landscape of training future dental practitioners. By harnessing the power of immersive technology, we can foster a new generation of healthcare professionals equipped with the skills, confidence, and competencies necessary to enhance patient care and ensure successful treatment outcomes.

Subject of Research: Enhancing preclinical dental education through VR-based digital platforms.

Article Title: Enhancing preclinical dental education through a VR-based digital platform for inlay tooth preparation.

Article References:
Sun, J., Zhang, X., Qin, Z. et al. Enhancing preclinical dental education through a VR-based digital platform for inlay tooth preparation. BMC Med Educ 25, 1630 (2025). https://doi.org/10.1186/s12909-025-08138-y

Image Credits: AI Generated

DOI: https://doi.org/10.1186/s12909-025-08138-y

Keywords: Virtual reality, dental education, preclinical training, inlay preparation, immersive technology.