The temporomandibular joint (TMJ) is one of the most heavily used and most intricate joints in the body — the hinge that connects your lower jaw to the skull, working every time you speak, chew or yawn. When it stops moving smoothly, the result is a cluster of symptoms known collectively as temporomandibular disorder (TMD). As a prosthodontist, I see TMJ problems regularly, because the way the teeth meet and the way the joint sits are closely linked. Research I co-authored investigating condyle positions in patients with temporomandibular joint disorder using cone-beam computed tomography, in the Kocaeli Üniversitesi Sağlık Bilimleri Dergisi (2023), reflects a long-standing clinical interest in reading this joint accurately. You can review this and other research by Dr. Sadık Taki on the publications page. At Taki Dent, the joint is always assessed before any extensive restorative work begins.
What a TMJ Disorder Actually Is
"TMD" is an umbrella term rather than a single disease. It covers problems arising from the joint itself, from the chewing muscles around it, or from a combination of both. The condition is common, often fluctuates over time, and frequently resolves with conservative care. The signs patients notice most often include:
Joint sounds and locking
Clicking or grating when opening, and occasionally a jaw that catches or locks. Painless clicking on its own is common and not always a sign that treatment is needed.
Pain and restricted opening
Tenderness around the joint or cheek muscles, headaches, and difficulty opening wide. Pain that limits eating or sleep is the symptom most worth investigating.
Why It Matters to a Prosthodontist
Prosthodontics is the discipline that rebuilds worn, broken or missing teeth — and the joint sits at the centre of that work. If a patient has lost occlusal vertical dimension through heavy wear, or grinds their teeth (bruxism), both the joint and the chewing muscles can be affected. My case-report research on occlusal vertical dimension loss in worn dentition (2020) examined exactly this overlap between tooth wear and jaw function. Before placing crowns, veneers or a full-mouth reconstruction, I need to know that the joint is stable, because a healthy bite cannot be built on an unstable foundation.
- Bite and joint are connected: How the teeth meet influences muscle activity and condyle loading. A new restoration changes the bite, so the joint must be understood first.
- Wear is a warning sign: Flattened, chipped or shortened teeth often signal clenching or grinding — habits that load the joint and may accompany TMD symptoms.
- Stability before reconstruction: Extensive restorative work is planned around a stable, comfortable joint position, not imposed on a joint that is still symptomatic.
Where CBCT Fits In
Diagnosis of TMD begins with the patient's history and a hands-on clinical examination — listening to the joint, measuring how far the jaw opens, and palpating the muscles. Imaging is then used selectively to answer specific questions. Cone-beam computed tomography (CBCT) is particularly useful for the bony components of the joint, because it produces a three-dimensional view of the condyle (the rounded head of the lower jaw) and the socket it sits in, at a far lower radiation dose than conventional medical CT.
What CBCT shows well, and what it does not, is worth being clear about:
What CBCT is good for
Assessing the shape and surface of the bony condyle, measuring the joint spaces around it, and detecting degenerative bony changes such as flattening or erosion. It allows the condyle's position within the socket to be measured consistently in three dimensions.
What it does not replace
CBCT images bone, not soft tissue. It does not show the articular disc, which is best assessed with MRI when a disc problem is suspected. Imaging always supports the clinical picture — it is not a substitute for examination, and findings are interpreted alongside symptoms.
What Condyle Position Can Tell Us
One question researchers have long debated is whether the position of the condyle within its socket relates to the presence of TMD. In our 2023 CBCT study, my co-authors and I compared condyle positions and the surrounding joint spaces between people with TMD symptoms and an asymptomatic group. The broad takeaway — and the reason the work matters clinically — is that three-dimensional imaging has a meaningful role in detecting differences in condyle position between symptomatic and asymptomatic joints, while individual variation remains wide. As with much TMD research, the study also underlined that larger investigations are needed to confirm and extend such findings.
The practical message for patients is one of caution rather than certainty: an imaging finding on its own does not diagnose a disorder. Many people with a slightly off-centre condyle have no symptoms at all, and some with significant symptoms show unremarkable bone. This is precisely why I read the scan in the context of the clinical examination, never in isolation.
How TMD Is Usually Managed
Most TMD is managed conservatively and reversibly, and many cases improve with simple measures. Evidence-based first steps typically include reassurance and education, jaw-rest advice, soft diet during flare-ups, heat or cold, gentle jaw exercises, and short-term anti-inflammatory medication where appropriate. A custom occlusal splint (night guard) is often used to reduce the load on the joint and protect the teeth in people who clench or grind.
Irreversible treatment — adjusting the bite, orthodontics or restorative reconstruction — is considered only once symptoms are stable and the diagnosis is clear, and even then with restraint. There are no guaranteed outcomes in TMD, and the goal is to manage symptoms and protect function rather than to promise a permanent cure. Where extensive restorative work is genuinely indicated, the same joint-first principle applies that underpins our approach to full-mouth reconstruction planning. Patients whose worn teeth need rebuilding may also find the discussion of material choice in our zirconia versus E-max comparison useful background.
If you are experiencing persistent jaw pain, locking or noticeable tooth wear, the most useful first step is a thorough clinical assessment — with imaging used only where it will change the plan. You can read more about the research behind this approach on the publications page.