CD: RECORD BASE, OCCLUSAL RIM, & TMJ

RECORD BASES

• Generally a temporary form that closely resembles the final base of the denture under construction.

RECORD BASES

• It is used for recording maxillomandibular jaw relationships and for setting artificial teeth.

RECORD BASES

• Part of CD that rests on ridges or denture areas which supports the teeth or where the teeth are arranged.

Temporary Base

should be reinforced and stabilized

• Shellac
• Self Curing acrylic
• Vacuum formed vinyl or polystyrene
• Baseplate wax

4 Types of Temporary Base

Permanent Bases

– serves like temporary baseplate in registering jaw relations but during processing it’s not discarded anymore

• Processed acrylic resin
• Gold
• Chromium Cobalt alloy
• Chromium nickel alloy

4 Types of Permanent Base

• 1. shellac
• 2. self cure
• 3. Permanent base

3 FABRICATION OF DENTURE BASES

1. Investing
2. Wax Elimination and Mold Space Preparation

2 Processing of Denture Base

anterior to the tragus of the ear

-the temporomandibular joint is Located where?

TMJ

-Considered an articulation between the base of the skull
and the condyle of the mandible.

squamous part of the temporal bone

-The articular surface of TMJ is the?

TMJ

They play a critical role in giving you the ability to eat, speak, and make facial expressions.

TMJ

is one of the most frequently used and complex joints in your body.

Ginglymoid joint

joint for hinging movement in one plane

Arthrodial joint

Gliding movements, which classifies it as an?

Ginglymoarthrodial joint

• the hinging and gliding movement has been technically considered a?

T

T/F
When the mouth opens there is a combination of
rotational movement of the discomandibular space and action of the translational discotemporal space;

F, the rotation occurs before the
translation.

T/F
the translation occurs before the rotation

T

T/F
The condyle can move backward, while the opposite condyle slides forward.

anterior sliding

• The bilateral or ipsilateral TMJ protrusion occurs by?

• Chewing
• Sucking
• Swallowing
• Phonation
• Facial expressions
• Breathing
• Protrusion
• Retrusion
• Lateralization of the jaw
• Opening the mouth
• Maintain the correct pressure of the middle ear

THE COMPLEX MOVEMENTS OF TMJ ALLOW MULTIPLE
FUNCTIONS:

F, Overloaded not underloaded.

T/F
When the masticatory system is Underloaded, a variety of structures can reveal breakdown, leading to symptoms

• tooth wear
• pulpitis
• tooth mobility
• muscle pain
• TMJ pain
• ear pain
• headache pain

Give Some of the more common symptoms TMD

• Medications
• Tricyclic Antidepressant
• Muscle Relaxant
• Oral Splints or Mouth Guard
• Physical Therapy
• Counseling
• Arthrocentesis
• Injections
• TMJ Arthroscopy
• Modified Condylotomy
• Open-Joint Surgery

TREATMENT FOR VARIOUS TMJ

Tricyclic antidepressants

These medications, such as amitriptyline, are used mostly for depression, but in low doses, they're sometimes used for pain relief, bruxism control and sleeplessness.

• Muscle relaxants

These types of drugs are sometimes used for a few days or weeks to help relieve pain caused by TMJ Disorder created by muscle spasms

Arthrocentesis

a minimally invasive procedure that involves the insertion of small needles into the joint so that fluid can be irrigated through the joint to remove debris and inflammatory byproducts.

Modified condylotomy

This addresses the TMJ indirectly, with surgery on the mandible, but not in the joint itself. It may be helpful for treatment of pain and if locking is experienced.

Open-joint surgery

If your jaw pain does not resolve with more-conservative treatments and it appears to be caused by a structural problem in the joint, your doctor or dentist
may suggest this surgical procedure to repair or replace the joint

Open-Joint Surgery

This treatment involves more risks than other procedures.

OCCLUSAL RIM

A wax form used to establish accurate
maxillomandibular jaw relations and for
arranging the artificial teeth to form trial
denture.

OCCLUSAL RIM

• Tentative blue prints that assist the dentist and
the dental laboratory technician throughout
the many phases of denture construction

OCCLUSAL RIM

• They also help determine the length and the
width of the artificial teeth, proper lip
support, the midline of the arch.

High Lip line

highest position a lip can assume when smiling, basis of length of incisor

• Midline

where central incisors will meet

Wilfred Fish

concept of neutral zone in complete denture construction

pattern of bone resorption

The best guide for determining the arch form is to consider the _ where the teeth are lost and the use of anatomical landmarks that are relatively stable in position

Bone loss

tends to occur on the labial side of the anterior residual ridge of the Mandibular Arch

Buccal & Lingual sides of Residual Ridge

Bone loss in premolar region of the Mandibular Arch

Lingual side of Residual Ridge

Bone loss in molar region of the Mandibular Arch

Bone reduction

usually occurs on the
labial and buccal areas of the maxillary
residual ridge.

interpupillary line; camper’s line

In Maxillary Arch, Rim is usually parallel to the 6 anteriorly and _ posteriorly

Vernier Caliper

Instrument used to measure the length or width of the Occlusal Rim

20 - 22mm

Anterior wax rim height is?

16-18mm

Posterior wax rim height is?

3-5mm

Anterior wax rim width is?

8-10

Posterior wax rim width is?

Occlusal Table

food is triturated in the mandibular occlusal surfaces

• Modiolus

“meeting place” of eight muscles

• Becomes fixed everytime the buccinator muscle contracts which is a natural accompaniment of all chewing efforts.

• Bell’s Palsy (cranial nerve 7)

Inc. Salivation after an IAN block

The Corners of the Mouth

they are marked on the occlusion rims to provide the dentist and technician with anterior landmarks for the height of the 1st premolars

2/3rds of Retromolar Pad

The Mandibular molars it is usually at level corresponding the

T

T/F
• The Maxillary Occlusion Rim is next adjusted to meet evenly with the Mandibular Rim.

VDO

established in the presence of a healthy natural dentition as part of the process of jaw development and maturation.

T

T/F
In people who have lost their natural teeth and must wear dentures it is established by the vertical height of the two dentures when the artificial teeth are in contact.

Vertical Dimension of Rest (VDR)

physiologic rest position of the mandible (established by muscles and gravity). It is postural relationship of the mandible to the maxillae and the teeth do not determine it.

LOST VERTICAL DIMENSION.

The difference between your VDR and VDO will determine the amount of

2 TO 4 mm

INTEROCCLUSAL DISTANCE/ FREEWAY SPACE should be ?

1. Swallow Test
2. Phonetics Test

Methods In Determining VDO