CENTRIC RELATION RECORD
There are 3 techniques that are frequently used.
a) Chinpoint guidance.
b) Bilateral manipulation....
- Hanau spring bow (Teledyne)
- Hanau series 184 wide-vue, arcon, semiadjustable
The Hanau spring-bow is an ear-piece face...
Face bow record
- Soften a sheet of baseplate wax in hot water and completely cover
the bitefork with it.
- Position the w...
fork shaft. The face bow should be pointed upward during this
action.
- Open the bow by pulling outward on the arms and sw...
- Use petrolatum to lubricate the surfaces of the upper and lower
members of the articulator around the threaded mounting ...
Mounting the mandibular cast
- Extend the incisal guide pin 1 to 2mm to compensate for the
thickness of the interocclusal ...
- The incisal guide pin should be resting firmly against the incisal
guide table. The hand should be used to steady the ma...
- If a protrusive interocclusal wax record is used to establish the
condylar inclination, both condylar mechanisms are rot...
the guide pin in the acrylic resin as a permanent record. Continue moving the casts until
polymerization is complete. Remo...
the guide pin in the acrylic resin as a permanent record. Continue moving the casts until
polymerization is complete. Remo...
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Centric relation record delete

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Centric relation record delete

  1. 1. CENTRIC RELATION RECORD There are 3 techniques that are frequently used. a) Chinpoint guidance. b) Bilateral manipulation. c) Unguided method. Chinpoint guidance puts the condyles in the most posterior and superior position and is not muscle guided. The unguided method produces a “physiologic muscle” position (condyles placed anterosuperiorly on the articulator disc along the articulator eminence). It is difficult to achieve consistent results with this method because of the patient’s muscle activity. The most consistent, repeatable results can be accomplished by utilizing the technique of Dawson. It was his opinion that the neuromuscular system monitors all sensory impulses from the teeth and jaws and programs occlusal contact to occur where the protective stimuli are minimal. This position, through repeated closures, become habitual and is maintained at the expense of normal muscle function. To enable the condyles to be placed in an unstrained position, the musculature must first be deprogrammed from its habitual closing pattern. ARTICULATION OF CASTS Hanau Facebow and Articulator:
  2. 2. - Hanau spring bow (Teledyne) - Hanau series 184 wide-vue, arcon, semiadjustable The Hanau spring-bow is an ear-piece facebow that utilizes a one-piece spring steel bow. It is simple in design and can be used with the removable bite fork assembly and mounting platform.
  3. 3. Face bow record - Soften a sheet of baseplate wax in hot water and completely cover the bitefork with it. - Position the wax-covered bitefork against the maxillary teeth and have the patient close until the mandibular teeth contact the wax on the underside of the fork. - Cool the wax in the mouth with an air syringe. Remove the fork from the mouth and finish coding it in a bowl of cold tap water. Trim off excess and any areas imprinted by soft tissue. - Seat the maxillary cast in the wax record to be sure that it is stable. If there is any rocking of the cast, cheek the occlusal surfaces of the cast for any nodules of stone. If there are none, either the cast or record is distorted and must be remade. - Insert the transfer rod of the assembly into the bow socket on the underside of the black centerpiece on the front of the face bow. It is made sure that the flat surface on the front of the rod faces the operator as it is placed in the socket. - While the patient grips the bite fork between the maxillary and mandibular teeth, position the loosened bite fork clamp over the bite
  4. 4. fork shaft. The face bow should be pointed upward during this action. - Open the bow by pulling outward on the arms and swing it down into position, placing on earpiece gently into each external auditory meatus. Have the patient adjust the earpieces to the most comfortable seated position. - Mark the orbitale on the patient’s face to provide on anterior reference point. Gently swing the orbitale pointer towards the reference mark. - Elevate the front of the face bow along the transfer rod of the bite fork assembly until the pointer is at the plane of the anterior reference point. - Grasp the bow to resist torquing and tighten the three thumb screws in order from left to right. Mounting the maxillary cast - Prepare the articulator to accept the casts by setting the inclination of the enclosed condylar track mechanisms at 30 degrees on each side. “Bennet angle” ring for the progressive mandibular lateral translation should be set at 30 degrees.
  5. 5. - Use petrolatum to lubricate the surfaces of the upper and lower members of the articulator around the threaded mounting studs. - Firmly secure a clean mounting plate to the mounting stud on the upper member of the articulator. Attach a mounting guide or platform to the lower member of the articulator. - Loosen the thumbscrew on the front of the facebow and remove the bitefork assembly. Place the vertical transfer rod of the assembly into the hole at the front of the mounting guide and secure it by tightening the screw. Adjust the cast support to touch the underside of the wax on the bitefork. - Soak the maxillary cast in a bowl of water, but do not cover the teeth with water. Carefully seat the maxillary cast into the imprints in the baseplate wax on the bite fork. - Raise the upper-member of the articulator and place a golf-ball sized mould of thick, creamy stone on the base of the cast. Swing the upper member of the cast down until the incisal pin is resting on the mounting guide or anterior table. Add more stone if necessary and smooth off the top with a spatula. - When the stone has set, remove the bitefork assembly and mounting guide from the articulator. Attach a clean mounting plate to the lower member of the articulator.
  6. 6. Mounting the mandibular cast - Extend the incisal guide pin 1 to 2mm to compensate for the thickness of the interocclusal wax record. - Tighten the centric lock on each enclosed condylar track mechanism to insure that the articulator is capable of nothing but hinge movement. - Invert the articulator on the bench top, resting it on the three thumb nuts protruding from the upper member of the articulator. - Place the centric relation wax interocclusal record on the teeth of the maxillary cast. - Place the mandibular cast into the interocclusal record and again confirm complete seating. There should be no contact between the maxillary and mandibular casts. - Remove the mandibular cast and soak it in water for about 2 minutes making sure that the teeth are not covered with water. - Reseat the soaked mandibular cast into the record, swing the lower member of the articulator up and back. Place a mound of thick, creamy mounting stone on the bottom of the cast. Hinge the lower member of the articulator back over into the soft mounting stone.
  7. 7. - The incisal guide pin should be resting firmly against the incisal guide table. The hand should be used to steady the mandibular cast in the retruded position wax registration until the mounting stone has achieved an initial set. Setting condylar guidance - Lateral or protrusive interocclusal wax records are used for setting the condylar inclination of this instrument. - Loosen the thumbnut at the rear of each condylar track mechanism so that it can be easily rotated. The condylar inclination is left at 30°. The incisal guide pin should be raised out of contact with the incisal table. - Seat the right interocclusal record on the teeth of the mandibular cast. Gently lower the upper member of the articulator until the maxillary teeth-engage the wax record. - Adjust the left condylar guide by changing the condylar inclination with thumbnut located at the rear of the guide. If the condylar path is too shallow, the anterior teeth will be drawn out of the wax record. When the path becomes too steep, the posterior teeth become unseated. The correct condylar inclination will be determined when the cast is seated completely in the wax record. Tighten the nut at the rear of the condylar guide.
  8. 8. - If a protrusive interocclusal wax record is used to establish the condylar inclination, both condylar mechanisms are rotated simultaneously in the same manner described above for setting each condylar inclination separately. - The lateral condylar guidance is estimated by using the formula, L = H /8 + 12 Custom Anterior guidance - A customized anterior guidance jig can be made for this articulator by using a round-end incisal pin and a flat anterior table. - Raise the incisal guide pin atleast 1.0mm off the plastic incisal guide block in all excursions. - Moisten the surface of the guide block with monomer. Mix one-half scoop of tray resin, and while it is still free-flowing, place a little on the incisal guide table. - Lubricate the tip of the incisal guide pin and the occluding surfaces of anterior teeth with petrolatum. - Close the articulator. The guide pin should sink into the soft acrylic resin. Move the articulator through all excursions repeatedly, keeping the anterior teeth touching at all times. The pathways of all the movements will be imprinted by the tip of
  9. 9. the guide pin in the acrylic resin as a permanent record. Continue moving the casts until polymerization is complete. Remove the excess.
  10. 10. the guide pin in the acrylic resin as a permanent record. Continue moving the casts until polymerization is complete. Remove the excess.

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