TMD is short for *temporomandibular disorders*, a group of conditions involving the jaw joint, chewing muscles, and related structures. It is commonly used in dentistry and medicine to describe jaw pain, joint noises, and limits in jaw movement. TMD is a clinical umbrella term, not a single disease and not a dental material. Clinicians use it to organize diagnosis, documentation, and treatment planning for jaw-related symptoms.
temporomandibular disorder is a group of conditions that affect the jaw joint (the temporomandibular joint, or TMJ) and the muscles that move the jaw. It is commonly discussed when people have jaw pain, jaw clicking, or trouble opening or closing the mouth. Dentists, oral medicine clinicians, and other healthcare professionals use the term to describe a pattern of symptoms rather than a single disease. It is used in dental clinics, pain clinics, and sometimes physical therapy settings when evaluating jaw-related discomfort and function.
kinesiography is a method for recording and analyzing how the lower jaw (mandible) moves. It is commonly used in dentistry to evaluate jaw function, bite dynamics, and related muscle and joint patterns. The goal is to turn jaw movement into measurable data that can be reviewed clinically. It may be used in assessments for temporomandibular disorders (TMD), occlusion (bite), orthodontics, and prosthodontics.
A facebow is a dental measuring device used to record how the upper jaw relates to the skull. It helps transfer that relationship to a dental articulator (a mechanical “jaw simulator”). Dentists and dental laboratories most often use it in prosthodontics, such as denture and crown/bridge planning. Its goal is to help restorations fit the patient’s bite more predictably, especially in complex cases.
A centric relation record is a bite registration used to capture how the upper and lower jaws relate in a specific, repeatable jaw position called centric relation. In plain terms, it is a “reference bite” that helps a dental team reproduce your jaw relationship outside the mouth. It is commonly used when making crowns, bridges, dentures, occlusal splints (night guards), or planning more complex occlusion (bite) changes. It can be taken with different materials (such as waxes or elastomeric bite registration materials) and is often used to mount models on an articulator.
maxillomandibular relation describes how the upper jaw (maxilla) and lower jaw (mandible) relate to each other in position and function. It is recorded so dental teams can reproduce a patient’s bite and jaw position outside the mouth. It is commonly used in dentures, crowns/bridges, implant restorations, and full-mouth treatment planning. In plain terms, it helps clinicians answer: “Where does the lower jaw sit relative to the upper jaw, and how do the teeth meet?”
The S sound test is a simple speech-based check used in dentistry to evaluate how the teeth, tongue, and palate work together during normal speaking. It focuses on the “s” sound (a sibilant fricative), which is sensitive to small changes in tooth position and vertical dimension. It is commonly used during denture try-ins, bite adjustments, and smile or restorative planning to screen for lisping or whistling. Clinicians may use it alongside other phonetic and bite records to refine comfort, function, and speech clarity.
F and V sounds are speech sounds made by lightly contacting the lower lip with the upper front teeth. They are used in dentistry as a simple phonetic check during restorative and prosthodontic care. They help clinicians evaluate how tooth position and lip support affect speech. They are commonly assessed during denture try-ins, cosmetic mock-ups, and after changes to front teeth.
phonetics is the study of speech sounds and how they are produced and heard. In dentistry, phonetics refers to using speech sounds to evaluate tooth position, bite relationships, and oral appliance design. It is commonly used when planning or adjusting dentures, crowns, veneers, and other restorations that affect the front teeth and palate. Clinicians also use phonetics as a practical “real-world” check of comfort and function during try-ins and follow-up visits.
incisal edge position describes where the biting edge of a front tooth sits in space. It is assessed relative to the lips, face, and opposing teeth when the mouth is at rest, speaking, and smiling. It is commonly used in cosmetic dentistry, orthodontics, and prosthodontics (crowns, veneers, dentures). It helps clinicians plan tooth length, appearance, and how the front teeth guide the bite.