Bitewing and periapical radiographs answer different questions, and current ADA/AAOMR recommendations say the choice between them should be guided by clinical judgment, the lesion's location and anatomical factors rather than by a fixed rule. No retrieved study compares the two views head-to-head on caries yield, and the only side-by-side comparison retrieved is from 1985, on film. The question is still live.
What the question actually is
Textbooks describe the two views one at a time, so the comparison never gets made. Turn it around. You don't choose a view. You choose a question, and the view follows from it.
For caries, the 2026 ADA/AAOMR recommendations are organised by surface — anterior proximal, posterior proximal, occlusal, root and smooth. The panel says decisions about which radiograph to use, including choosing between a bitewing and a periapical view, should be guided by clinical judgment and take into account the lesion's location and anatomical factors, including whether the anterior or posterior proximal spaces are closed [2]. Read that carefully: it is a decision rule about the lesion, not about the view.
For an initial endodontic assessment, the same panel recommends intraoral 2D radiographs as the primary imaging modality, and says CBCT may be indicated after an initial clinical examination and assessment using 2D imaging [2].
For periodontal disease, it states that current evidence supports a 2D full-mouth radiographic series alongside a clinical examination as the gold standard for evaluation [2].
| The question you're asking | What current guidance and evidence say |
|---|---|
| Is there a proximal lesion, and how deep? | The choice of view is left to clinical judgment, the lesion's location and anatomical factors including whether the proximal spaces are closed [2] |
| How much crestal bone is there? | A 2D full-mouth series plus clinical examination is the stated gold standard for periodontal evaluation [2]; in a 1985 study of standardised film radiographs the two intraoral views gave identical bone-level readings at 82% of 10,016 sites, a conclusion its authors scoped to epidemiologic studies [3] |
| What is happening at the apex? | Intraoral 2D radiographs are the primary modality for initial endodontic evaluation; CBCT may be indicated after an initial clinical examination and 2D assessment [2] |
| Which view is more accurate overall? | No retrieved study compares the two head-to-head on caries yield; the only side-by-side comparison retrieved is from 1985, on film [3] |
Where the two views overlap
The overlap is bone.
A 1985 comparison of 455 sets of standardised radiographs, four periapicals and two bitewings per set, found alveolar bone level assessable at 10,016 sites, and the two views gave identical readings at 82% of them. The authors concluded that the two radiographic techniques may be used interchangeably in epidemiologic studies [3]. That last clause is doing a lot of work. It is a statement about population surveys, not about the patient in front of you.
Agreement wasn't uniform round the arch either. In the same study, bitewings had significantly higher proportions of unreadable sites at the canines and the mesial surface of first premolars, while periapicals had significantly higher proportions of unreadable sites at the distal surface of second molars (P < 0.0001 for both) [3].
So the overlap matters, but it is regional, it is old, and it was measured on film.
What the evidence shows
There is no retrieved head-to-head trial of bitewing against periapical for caries yield. What the literature gives you instead is yield per question.
For caries, a 2015 meta-analysis of 117 studies covering 13,375 teeth and 19,108 surfaces reported pooled sensitivity for dentine lesions running from 0.36 (0.24/0.49) for proximal lesions to 0.56 (0.53/0.59) for occlusal lesions, with specificities between 0.87 (0.85/0.89) and 0.95 (0.94/0.96). The majority of the included studies were at high risk of bias, and the pool mixes in vitro with clinical conditions [4]. The review's own conclusion was that radiographic caries detection is highly accurate for cavitated proximal lesions and appears suitable for detecting dentine lesions, and that for initial lesions more sensitive methods could be considered in populations with high caries risk and prevalence [4]. If you want the detection threshold on its own, that's a separate question: how early proximal caries can be seen on a bitewing. So is how the depth bands are classified once you have found something.
For periodontitis, a 2025 systematic review pooled three studies of standard 2D radiographs: periapical, bitewing or panoramic. It reported sensitivity 0.77 (95% CI 0.66–0.85), specificity 0.76 (95% CI 0.64–0.84) and accuracy 0.82, concluding that standard 2D radiographs appear to have adequate diagnostic accuracy for periodontitis [5].
Before that number goes anywhere, note what it covers. The three views were pooled together, so the figure belongs to none of them on its own.
Where it's unsettled
Three separate gaps, and they compound.
No modern head-to-head comparison was retrieved here. The study that does put the two views side by side is from 1985, on film, and its authors scoped their own conclusion to epidemiologic studies [3].
The yield evidence doesn't separate the views. Both syntheses above answer "how well do radiographs find this", not "which radiograph finds it better" [4][5].
And the guidance names the decision without resolving it. The 2026 statement is explicit about its own footing: because of limitations in the available evidence, its authors developed consensus recommendations rather than formal guidelines [1]. It updates and supersedes the 2012 ADA/FDA patient-selection document [1].
It also isn't the only document in play. In the UK, Selection Criteria for Dental Radiography, first published in 1998, now in its third edition, covers caries diagnosis, periodontal assessment, endodontic assessment, the developing dentition and implantology, and the Care Quality Commission expects practices in England to comply with its recommendations [6]. Two bodies, two documents, separate revision cycles. Where you practise decides which one you are held to.
What this means at the chairside
Ask what you need to see, then pick.
If the question is a proximal surface, the recommendations point you at the lesion's location and the anatomy, including whether the proximal spaces are closed, rather than at a default view [2].
If the question is the apex, intraoral 2D imaging comes first, and CBCT may be indicated after an initial clinical examination and that 2D assessment [2].
If the question is a periodontal baseline, the stated gold standard is a 2D full-mouth series together with a clinical examination [2].
If the question is crestal bone at one site, know what you are leaning on: the only side-by-side comparison retrieved here is from 1985, on standardised film-era radiographs, with an interchangeability conclusion its authors limited to epidemiologic studies [3].
And before any of it, the clinical examination. The 2026 statement says a thorough evaluation of patient history and clinical findings should precede radiographic examination, and that imaging decisions should rest on the patient's medical and dental histories, clinical examination findings, disease risk assessment and the presence of specific clinical conditions [1].
None of which helps once the image is on the screen. Whichever view you took, you still have to read it — and the reading is where overlapped contacts, cervical burnout, secondary caries under an existing filling, a restoration overhang and plain occlusal lesions all start to look like each other.
References
- Benavides E, Krecioch JR, Allareddy T, Buchanan A, Keels MA, Mascarenhas AK, et al. American Dental Association and American Academy of Oral and Maxillofacial Radiology patient selection for dental radiography and cone-beam computed tomography: Clinical recommendations. J Am Dent Assoc. 2026 Jan;157(1):20–35.e5. PMID 41500761. DOI 10.1016/j.adaj.2025.10.013
- Versaci MB. New ADA recommendations confirm dental imaging most effectively used in moderation. ADA News, American Dental Association, 5 January 2026. adanews.ada.org
- Albandar JM, Abbas DK, Waerhaug M, Gjermo P. Comparison between standardized periapical and bitewing radiographs in assessing alveolar bone loss. Community Dent Oral Epidemiol. 1985 Aug;13(4):222–5. PMID 3862504. DOI 10.1111/j.1600-0528.1985.tb01908.x
- Schwendicke F, Tzschoppe M, Paris S. Radiographic caries detection: A systematic review and meta-analysis. J Dent. 2015;43(8):924–33. PMID 25724114. DOI 10.1016/j.jdent.2015.02.009
- Discepoli N, De Rubertis I, Wasielewski C, Troiano G, Carra MC. Accuracy of ionizing-radiation-based and non-ionizing imaging assessments for the diagnosis of periodontitis: systematic review and meta-analysis. J Clin Periodontol. 2025 Feb;52 Suppl 29:74–124. PMID 39939533. DOI 10.1111/jcpe.14137
- College of General Dentistry. Selection Criteria for Dental Radiography, 3rd edition. cgdent.uk
Dr. Wael Mansour
Papilla helps dental students, dentists, and dental hygienists learn to read radiographs, one real case at a time, against outlines drawn by expert annotators.