We in Chinthamani Laser Dental Clinic & Implant Centre ,cover every speciality and subspeciality in dentistry so that all kind of your dental problems can be treated efficiently and effectively. Contact us: Chinthamani Laser Dental Clinic & Implant Centre 1/464,Mount Poonamallee High Road, Iyyapanthangal, Chennai-56 Phone no.044-43800059 , 92 83 786776 Email: chinthamanidental@gmail.com, dr_mrgvl@gmail.com Website: www.chinthamanilaserdentalclinic.com

1. Chinthamani Laser Dental Clinic

2. Temporomandibular Joint
Temporomandibular Joint consists of
mandible suspended from temporal
bone via ligaments and muscules,
including stylomandibular and
sphenomandibular ligaments,
A true synovial joint, capable of gliding,
hinging, sliding and slight rotation
mandible and temporal bone
separated by meniscus (disc).
A Fibrous capsule is attached
arround the articular surface of the
mandible and neck of the mandible.
Laterally it is thichkened to form a
triangular band of lateral ligament.
The braod base is attached above to
zygomatic process of temporal bone
and tubercle. Its apex is attached to
lateral side of the neck of the
mandible.

3. • TMJ Anatomy
• The temporomandibular joint,
or TMJ, is the articulation
between the condyle of the
mandible and the squamous
portion of the temporal bone.
• The condyle is elliptically
shaped with its long axis
oriented mediolaterally.
•

4. • The articular surface
of the temporal bone
is composed of the
concave articular
fossa and the convex
articular eminence.

5. The MENISCUS is a oval in outlineand made of fibrous tissue.It is saddle shaped
structure that separates the condyle and the temporal bone. The meniscus varies in
thickness: the thinner, central intermediate zone separates thicker portions called
the anterior band and the posterior band.The upper surface of the disc is concavo
convex to fit the articular tubercleand the manduibhular fossa.Its concave inferior
surface limits the smaller of the two cavities of the joint and fits to the head of the
mandible.
Posteriorly, the meniscus is contiguous with the posterior attachment tissues called
the bilaminar zone. The bilaminar zone is a vascular, innervated tissue that plays an
important role in allowing the condyle to move foreward. The meniscus and its
attachments divide the joint into superior and inferior spaces. The superior joint
space is bounded above by the articular fossa and the articular eminence. The
inferior joint space is bounded below by the condyle. Both joint spaces have small
capacities, generally 1cc or less.

6. • Coronoid process
– insertion for portions of temporalis and
masseter
– incisura mandibularis, or sigmoid notch
• Meniscus (disc)
– synovial fluid above and below disc
– “shock absorber”
– internal derangement in 50% of all people
• anteriorly and medially most common
• jaw “pops”
– held in place by medial and lateral capsular
ligaments and retrodisc pad

7. • Normal TMJ Function
• When the mouth opens, two distinct motions occur at the
joint.
• The first motion is rotation around a horizontal axis
through the condylar heads.
• The second motion is translation. The condyle and
meniscus move together anteriorly beneath the articular
eminence.
• In the closed mouth position, the thick posterior band of
the meniscus lies immediately above the condyle. As the
condyle translates forward, the thinner intermediate zone
of the meniscus becomes the articulating surface
between the condyle and the articular eminence. When
the mouth is fully open, the condyle may lie beneath the
anterior band of the meniscus

8. • TMJ Dysfunction
• Internal derangement of the TMJ is present when the
posterior band of the meniscus is anteriorly displaced in
front of the condyle. As the meniscus translates
anteriorly, the posterior band remains in front of the
condyle and the bilaminar zone becomes abnormally
stretched and attenuated. Often the displaced posterior
band will return to its normal position when the condyle
reaches a certain point. This is termed anterior
displacement with reduction.
• When the meniscus reduces the patient often feels a pop
or click in the joint. In some patients the meniscus
remains anteriorly displaced at full mouth opening. This
is termed anterior displacement without reduction.
Patients with anterior displacement without reduction
often cannot fully open their mouths'. Sometimes there is
a tear or perforation of the meniscus. Grinding noises in
the joint are often present.

9. Email.id:chinthamanidental@gmail.com
044-43800059 , 92 83 786 776
www.chinthamanilaserdentalclinic.com

10. Email.id:chinthamanidental@gmail.com
044-43800059 , 92 83 786 776
www.chinthamanilaserdentalclinic.com