How Safe Is Dental X-Ray During Pregnancy and Where Is the Line Between Justified Caution and Evidence-Free Refusal?

What Matters More: Actual Radiation Dose or Perceived Risk?

One of the most common questions patients ask about this topic concerns actual radiation dose vs. perceived risk. The answer is not as simple as one might hope — but research now provides clear guidance.

The systematic review by Gamba et al. (2024) analyzed seven studies, including three retrospective investigations of pregnant women and four phantom studies. None of the included studies measured a uterine dose exceeding 0.01 mGy for individual intraoral exposures. These values are several orders of magnitude below the teratogenic threshold of 50–100 mGy, which is considered the lower limit for deterministic harm in radiation biology.

Flagler et al. (2022) document in their narrative review the historical decline in radiation exposure over six decades. The transition from D-speed to F-speed films reduced exposure by approximately 60%, and the introduction of digital sensors further lowered the dose. A single digital periapical exposure currently delivers an effective dose of approximately 5 µSv — less than one day of natural background radiation.

The phantom studies in the review by Gamba et al. (2024) show that even panoramic radiographs result in fetal doses in the range of 0.001–0.01 mGy. For cone beam computed tomography (CBCT), estimated uterine doses are higher, but remain well below 0.1 mGy. These data support the position that no clinically used dental imaging modality comes anywhere near the teratogenic threshold.

The perceived risk is markedly disproportionate to the actual exposure. Flagler et al. (2022) report that fewer than half of all pregnant women in the United States seek dental care, with radiation anxiety cited as one of the central reasons. At the same time, epidemiological data show that untreated dental infections during pregnancy are associated with increased risk of preterm birth and low birth weight.

Methodologically, it should be noted that the included studies varied considerably in study design, follow-up period, and population selection. This heterogeneity limits the comparability of results and explains why pooled effect estimates must be interpreted with caution. Nevertheless, the direction of the effect is consistent across different study types.

For applicability to the German-speaking healthcare context, it is additionally relevant that a substantial portion of the scientific evidence comes from Anglo-American or Scandinavian healthcare systems. Differences in reimbursement structures, treatment culture, and patient access may influence effect sizes without invalidating the core conclusion.

For clinical practice, a clear course of action emerges: urgent diagnostic imaging can be performed at any stage of pregnancy with appropriate radiation protection. The absolute fetal dose from a single dental exposure is in the range of a few microsieverts — far below any clinically relevant threshold.

The distinction between elective and urgent imaging remains the operational core. Routine status radiographs or panoramic images without an acute clinical indication should preferably be taken after delivery. In cases of acute symptoms, suspected abscess, or necessary treatment planning, pregnancy must not be a barrier to diagnosis.

In everyday practice this means: the scientific evidence does not provide a one-size-fits-all answer, but rather a framework for individualized decisions. Patient-specific factors such as general health, compliance, individual risk profiles, and treatment preferences must be considered.

What does this mean for you? The article must make the dose reality transparent.

In everyday life, you may encounter this topic more often than you think. What is important to keep in mind: not every report you find in the media or on the internet accurately reflects the state of research. The studies present a more nuanced picture than broad headlines might suggest.

Science has investigated this topic intensively in recent years. Multiple scientific studies contribute to the current assessment. It is important to understand: not every study carries the same weight. Large, well-controlled studies deliver more reliable results than small observational studies. The overall picture from these various studies is what we present to you here.

What Does "Indication-Setting During Pregnancy" Mean for Me as a Patient?

When it comes to indication-setting during pregnancy, the research picture is clearer than many people think. Here you will learn what current studies actually show.

Brouwer et al. (2016) conducted a systematic review summarizing multiple studies on the accuracy of various detection methods for secondary caries. From 1,179 screened studies, 23 were included. Visual inspection (n = 11 studies), radiography (n = 13), and laser fluorescence (n = 8) showed comparable sensitivities in the range of 0.50 to 0.59 and specificities of 0.78 to 0.83.

Tactile examination (n = 7 studies) proved to be unreliable. Quantitative light-induced fluorescence (n = 3) showed higher sensitivity on non-proximal surfaces but low specificities. The findings suggest that no single method is sufficient as the sole diagnostic standard and that combining multiple methods increases diagnostic accuracy.

Gamba et al. (2024) emphasize in their review that the decision to use imaging during pregnancy should not be based solely on radiation dose, but rather on the diagnostic benefit. Radiographic diagnosis remains an indispensable component of dental assessment, whose benefit in cases of acute symptoms outweighs the marginal risk.

The body of evidence consistently shows that radiography is the most reliable complement to visual inspection for proximal surfaces. Brouwer et al. (2016) found that visual and laser fluorescence methods offer advantages on non-proximal surfaces and with composite restorations, while radiography makes its strongest diagnostic contribution for approximal caries adjacent to amalgam restorations.

Methodologically, it should be noted that the included studies varied considerably in study design, follow-up period, and population selection. This heterogeneity limits the comparability of results and explains why pooled effect estimates must be interpreted with caution. Nevertheless, the direction of the effect is consistent across different study types.

For applicability to the German-speaking healthcare context, it is additionally relevant that a substantial portion of the scientific evidence comes from Anglo-American or Scandinavian healthcare systems. Differences in reimbursement structures, treatment culture, and patient access may influence effect sizes without invalidating the core conclusion.

In practice, this means: when radiographic diagnosis is clinically indicated, it should also be performed during pregnancy. The diagnostic quality of the image is not affected by pregnancy, and the information gained can be decisive for treatment planning.

The combination of visual inspection and targeted radiography remains the pragmatic gold standard. During pregnancy, indications should be assessed particularly carefully — which means focused application, not abstention.

In everyday practice this means: the scientific evidence does not provide a one-size-fits-all answer, but rather a framework for individualized decisions. Patient-specific factors such as general health, compliance, individual risk profiles, and treatment preferences must be considered.

What does this mean for you? The decision must differentiate between elective and urgent imaging.

In everyday life, you may encounter this topic more often than you think. What is important to keep in mind: not every report you find in the media or on the internet accurately reflects the state of research. The studies present a more nuanced picture than broad headlines might suggest.

How do scientists arrive at these conclusions? They do not evaluate just a single study, but look at many investigations simultaneously. This allows them to determine whether a result was coincidental or whether it is consistently confirmed. In this case, the findings are based on 4 scientific studies from different countries and research groups.

What Does "Patient Communication and Anxiety Management" Mean for Me as a Patient?

One point that often causes uncertainty is patient communication and anxiety management. But science has made important advances in recent years.

What does research say? Good education about the actual dose magnitude reduces anxiety and prevents diagnostic delays.

Where are there still open questions? The ideal communication strategy has not been systematically investigated.

In everyday life, you may encounter this topic more often than you think. What is important to keep in mind: not every report you find in the media or on the internet accurately reflects the state of research. The studies present a more nuanced picture than broad headlines might suggest.

What makes these findings reliable? In medical research, the rule is: the more independent studies arrive at the same conclusion, the more certain the statement. The type of study and the number of participants also play an important role. Large controlled studies with many participants deliver more reliable results than small surveys.