For veterinary professionals
November 4, 2026
Guinea pig cheek teeth are hard to image well. The skull is small, the arcades overlap, and the teeth curve in ways that make a lateral radiograph look tidier than the mouth really is. Most of us have trimmed a guinea pig's cheek teeth, sent them home eating, and seen them back a few weeks later with the same problem.
Macrodontia is one of the reasons. The affected tooth is enlarged and structurally abnormal, and it is a common driver of malocclusion. Ignaszak-Dziech and Piasecki used cone-beam CT (CBCT) to describe what these teeth look like in three dimensions.
This was a retrospective review of CBCT datasets from 62 guinea pigs imaged for clinical reasons. Forty-two had at least one macrodontic cheek tooth and were included. In total, 666 premolars and molars were evaluated, and 104 of those had structural changes typical of macrodontia.
The authors measured tooth circumference, scored premolar and molar alveoli on a four-grade scale, and classified structural changes as isodense or heterodense.
The authors conclude that CBCT shows tooth structure, size, and periapical change in a way conventional radiography cannot.
The number I would pay attention to is the remodeling. Most macrodontic teeth sat in bone that was already significantly changed. That fits with what we see clinically: these are not just crowns that need shortening. They are teeth with apical and alveolar disease underneath, and the occlusal problem is only the visible part.
It also explains some of the frustration. Widened periodontal and interdental spaces give food a place to pack, and a tooth losing substance at the occlusal margin does not wear evenly against its partner. Trimming the crown treats the symptom.
The dataset is a reasonable size for guinea pig dentistry, and tooth-level analysis across 666 teeth gives the comparisons some weight. Having a scoring system for alveolar change is useful for anyone trying to stage cases consistently.
It is retrospective and based only on animals that were scanned for a clinical reason, so it tells us about guinea pigs already sick enough to image. There is no histology or outcome data, so we can't say which CBCT features predict treatment failure or extraction need. It also doesn't compare CBCT directly with radiographs in the same animals.
Radiographs still have a place. In my practice we take skull and dental radiographs in house when cheek tooth disease is suspected, and they answer a lot of questions. But a guinea pig that keeps coming back, has a swelling or ocular change, or is being considered for extraction deserves a better look at the apices and alveolar bone. That is where CT earns its cost. When a guinea pig needs that imaging, CT is arranged with Nashville Veterinary Specialists.
Some practical points I would take from this paper:
Ignaszak-Dziech J, Piasecki T. Cone-beam computed tomographic features of macrodontic cheek teeth (premolars and molars) in guinea pigs. J Small Anim Pract. 2026 (epub ahead of print). doi:10.1111/jsap.70217
If you have a guinea pig that keeps relapsing after cheek tooth trims, or one you think may need extraction or CT, reach out to Dr. Kopp personally. Dr. Kopp is Nashville's exotic companion mammal specialist and takes guinea pig dental referrals. The guide to referring dental cases lists what to send, and the referral information for veterinarians covers the rest. Or call Dr. Logan Kopp at Priest Lake Veterinary Hospital, (615) 361-4646.
This content is for educational purposes for veterinary professionals. It doesn't establish a VCPR or replace clinical judgment for an individual patient. Drug use and doses should be checked against current references and adjusted for each case.