Record Blocks (Occlusion Blocks) Dental Lecture Notes PDF

Record Blocks (Occlusion Blocks) Presented by: Dr. Mai Salah El-Din Lecturer of prosthodontics. AASTMT (BDS, Msc, Phd in Prosthodontics)  Record Blocks (Occlusion Blocks) Clinical step: Laboratory step: Primary impression...

Record Blocks (Occlusion Blocks) Presented by: Dr. Mai Salah El-Din Lecturer of prosthodontics. AASTMT (BDS, Msc, Phd in Prosthodontics)  Record Blocks (Occlusion Blocks) Clinical step: Laboratory step: Primary impression Study cast Clinical step: Laboratory step: Final impression Master cast Record block  Outline: Wax rims: Record base: 1-Definition. 1-Definition. 2-Requirements. 2-Requirements. 3-Objectives. 3-Objectives. 4-Materials. 4-Materials. 5-Dimensions.  Record base: Definition: An interim denture base used to support the record rim material for recording maxillo- mandibular records.  Record base: Objective: 1-To retain the recording medium or device used for recording maxillo-mandibular relations. 2-To aid in transfer of accurate jaw relation-ships to an articulator. 3-To enable the setting of artificial teeth for the trial denture. 1-To retain the recording medium or device used for recording maxillo-mandibular relations. 2-To aid in transfer of accurate jaw relation-ships to an articulator. 3-To enable the setting of artificial teeth for the trial denture.  Record base: Requirements: 1. Rigid. 2. Accurate and stable. 3. The borders should be developed in the same manner as borders of finished denture.  Record base: Requirements: 4. All surfaces that contact lips, cheek and tongue should be smooth, round and polished. 5. The crest, labial and /or buccal slopes should be thin to provide space for teeth arrangement.  Record base: Types: Temporary Record Bases Permanent Record Bases They are discarded and They are not replaced by denture base material, once their role in discarded and establishing become part of the jaw relation, actual base of the teeth arrangement and try finished complete in is denture. complete.  Record base: Materials: Temporary Record Bases 1. Shellac base plate. a-Reinforced shellac base plate. b-Stabilized Shellac base plate. 2. Cold cure acrylic resin. 3. Visible light cure acrylic resin. 4. Vacuum formed vinyl and polystyrene  Record base: Materials: Temporary Record Bases 1-Shellac base plate: The shellac record base forms are manufactured in the shapes of the maxillary and mandibular arches.  Record base: Temporary Record Bases Materials: 1-Shellac base plate: Advantages: 1-Adapt to intimate contact with the master cast. 2-Require short time for construction. 3-Inexpensive. 4-Can be corrected easily by reheating and readapting to the master cast. 5-Uniform thickness.  Record base: Materials: Temporary Record Bases 1-Shellac base plate: Disadvantages : 1-Do not fit accurately. 2-Distort easily. 3-Lack rigidity. 4-Become brittle and break.  Record base: Materials: Temporary Record Bases 1-Shellac base plate: Steps: 1. Undercuts are relieved. 2. Separating medium is applied. 3. The forms are softened with flame and molded to the cast with an instrument or the fingers. 4. The excess is removed with scissor.  Record base: Materials: Temporary Record Bases 1-Shellac base plate:  Record base: Materials: a)Reinforced Shellac: A flattened wire is contoured and adapted 1-Across the posterior 2-To the lingual flange palatal seal area of the of the mandibular maxillary record base. record base.  Record base: Materials: b)Stabilized Shellac: A thin layer of zinc oxide eugenol impression paste or rubber base impression material is spread over the tissue side of the base and seated on the cast in the manner of making impression. But 1. Still subject to distortion and breakage. 2. Bulky. 3. The odor and taste of the paste are objectionable to some patients.  Record base: Materials: Temporary Record Bases 1. Shellac base plate. a-Reinforced shellac base plate. b-Stabilized Shellac base plate. 2. Cold cure acrylic resin. 3. Visible light cure acrylic resin. 4. Vacuum formed vinyl and polystyrene.  Record base: Materials: Temporary Record Bases 2. Cold cure acrylic resin: Most widely used material for production of base plates  Record base: Materials: Temporary Record Bases 2. Cold cure acrylic resin: Advantages 1-Good strength no need Disadvantages: for reinforcement. 1-Require more time in 2-Good dimensional fabrication. stability. 2-Difficult to control the 3-Does not warp during thickness. manipulation. 3-Residual monomer can 4-Closely fit to the master cause irritation to oral tissues. cast.  Record base: Materials: Temporary Record Bases 2. Cold cure acrylic resin: Methods of construction: Sprinkle on method. Non compression dough (Finger adapted) method.  Record base: Materials: Temporary Record Bases 2. Cold cure acrylic resin: Methods of construction: 1-Sprinkle on method 1. Any undercuts are blocked out with modeling wax.  Record base: Temporary Record Bases Materials: 2. Cold cure acrylic resin: Methods of construction: 1-Sprinkle on method 2. Separating medium is applied to the cast, so that the record base can be easily removed without damaging the master cast.  Record base: Materials: Temporary Record Bases 2. Cold cure acrylic resin: Methods of construction: 1-Sprinkle on method 3. Using an eye dropper apply the monomer to the cast, carefully add the polymer (salt and pepper technique) until a sufficient thickness is gained over the entire surface of the cast.  Record base: Materials: Temporary Record Bases 2. Cold cure acrylic resin: Methods of construction: 2-Non compression dough (Finger adapted) method: 1. Undercuts are blocked out, separating medium is applied to the cast. 2. The self curing resin is mixed. 3. When it reach the dough stage, it is molded to the cast.  Record base: Materials: Temporary Record Bases 2. Cold cure acrylic resin: Methods of construction: 2-Non compression dough (Finger adapted) method: 4. It is allowed to polymerized completely. 5. The processed base is removed from the cast, smoothed, and polished at the borders.  Record base: Materials: Temporary Record Bases 2. Cold cure acrylic resin: Requirements: 1. Retromolar pad area covered. 2. Palate should be 1-2 mm thick and well adapted. 3. Thin areas labial to ridge.  Record base: Materials: Temporary Record Bases Requirements: 2. Cold cure acrylic resin: 4. No excess flash on land area of master casts. 5. Record bases do not rock on master casts and are reasonably retentive.  Record base: Materials: Temporary Record Bases 2. Cold cure acrylic resin: Requirements: 6. No porosities or voids on tissue surface. 7. Flanges smooth and round. 8. Tissue surface well adapted.  Record base: Materials: Temporary Record Bases 1. Shellac base plate. a-Reinforced shellac base plate. b-Stabilized Shellac base plate. 2. Cold cure acrylic resin. 3. Visible light cure acrylic resin. 4. Vacuum formed vinyl and polystyrene  Record base: Materials: Temporary Record Bases 3. Visible light cured acrylic resin: Methods of construction: 1-Any undercuts are relieved. 2- Separating medium is applied to the cast. 3- Adapt a sheet of pink base plate material to the cast by fingers and prevent trapping of air.  Record base: Materials: Temporary Record Bases 3. Visible light cured acrylic resin: Methods of construction: 4-Cure the record base for 4 minutes in the light cure unit. 5-Carefully removed from the cast, invert and cure the tissue surface for 4 minutes. 6-The processed base is removed from the cast, smoothed, and polished at the borders.  Record base: Materials: Temporary Record Bases 1. Shellac base plate. a-Reinforced shellac base plate. b-Stabilized Shellac base plate. 2. Cold cure acrylic resin. 3. Visible light cure acrylic resin. 4. Vacuum formed vinyl and polystyrene.  Record base: Materials: Temporary Record Bases 4. Vacuum formed vinyl and polystyrene: Methods of construction: 1-A sheet of base plate material placed over the cast and inserted in the vacuum chamber. 2-Electric heater switched to heat the sheet. 3-The sheet will adapt closely to the cast.  Record base: Materials: Temporary Record Bases 4. Vacuum formed vinyl and polystyrene: Methods of construction: 4-Switch off the heater and allow the record base to cool. 5-Remove the record base and cut the excess material.  Record base: Materials: Temporary Record Bases 4. Vacuum formed vinyl and polystyrene: Advantages 1) Easy to fabricate. Disadvantages: 2) Uniform thickness. 1) Expensive. 3) Accurate adaptation 2) Difficult to form to the master cast. smooth rounded 4) Good rigidity borders  Record base: Types: Temporary Record Bases Permanent Record Bases They are discarded and replaced by denture base They are not material, once their role discarded and in establishing become part of the jaw relation, actual base of the teeth arrangement and finished complete try in is denture. complete.  Record base: Materials: Permanent Record Bases: 1. Heat cured acrylic resin. 2. Metal record bases: a-Cast gold. b-Chromium-nickel alloy. c-Chromium-cobalt alloy.  Record base: Materials: Permanent Record Bases: 1. Heat cured acrylic resin: Advantages Disadvantages: 1-Strong & rigid. 1-Time consuming. 2- Control thickness ( during waxing up ). 2-Need to construct mounting casts. 3-Minimizes dimensional changes. 3-Second processing to attach teeth causes 4-Temporary denture base warpage. become part of the denture.  Record base: Materials: Permanent Record Bases: 2. Metal record bases: Advantages: 1-No acrylic warpage. Disadvantages: 2-More strength. 1-Cost. 3-More accurate. 2-Difficulty in 4-Less porosity. relining. 5-More hygienic. 3-Time consuming. 6-Good thermal conductivity.  Occlusion rim: Definition: The occlusal surfaces fabricated on record base for the purpose of making maxillo-mandibular relationship records and/or arranging teeth.  Occlusion rim: Objectives: 1-Determination of jaw relation:  Occlusion rim: Objectives: When patient smiling; the whole of anterior incisor 2-Selection of teeth : should be seen. High Low Lip Line when lip is relax, At the canine line. 2 mm of anterior teeth should be seen.  Occlusion rim: Objectives: 2-Selection of teeth : Position of the corners of the mouth are marked on the wax rims and the distance between these two marks serve as a guide to tooth selection. Width of 6 anterior teeth ==== distance between the 2 canine lines.  Occlusion rim: Objectives: 3-Setting up of teeth :  Occlusion rim: Objectives: 4-Support of the facial musculature:  Occlusion rim: Objectives: 5-Orientation of occlusal plane:  Occlusion rim: Requirements: 1. The position should be in the anticipated position of the artificial teeth. 2. It must be securely attached to the base. 3. The occlusal surface must be smooth and flat. 4. It should be contoured to support the lip and cheeks accurately.  Occlusion rim: Materials: 1. Wax occlusion rim: a. Bite blocks wax (readymade occlusion rim).  Occlusion (wax) rim: Materials: 1. Wax occlusion rim: b. Base plate wax sheets (handmade occlusion rim): It is easier to manage in the registrations and in the arrangement of teeth.  Occlusion rim: Materials: 2. Modelling compound occlusion rim: 1-Used for functional methods of recording jaw relations. 2-Suitable for mounting different types of graphic tracers.  Occlusion (wax) rim: Dimensions: Maxillary arch: 16mm 22 mm high from the depth of the sulcus at the region of the 16mm high when measured canine eminence. from the depth of the sulcus in the posterior region.  Occlusion (wax) rim: Posterior border terminates at the Dimensions: anterior aspect of the maxillary tuberosity. Maxillary arch: 30ْ The anterior portion of the maxillary occlusal rim is The posteriors of the labially oriented. occlusion rims are cut at a 30º angle to the occlusal plane,  Occlusion (wax) rim: Dimensions: 4 to 6 mm wide in Maxillary arch: the anterior region 8 to 12 mm wide in the posterior region.  Occlusion (wax) rim: Dimensions: Maxillary rim slightly The anterior wax facial to compensate rim height is for ridge resorption 16mm high Mandibular arch: when measured from the depth of 8 to 12 mm wide the sulcus. in the posterior region. The posterior wax 4 to 6 mm wide in rim height 2/3 of the anterior region the retromolar pad.  Occlusion (wax) rim: Dimensions: Mandibular arch: The posterior wax rim height 2/3 of the retromolar pad.  Occlusion (wax) rim: Dimensions:  Occlusion (wax) rim: Marking the occlusion rims : High lip line Smile line Canine lines: corners of the mouth Central line or midline: when the lips are relaxed below the center of philtrum  Occlusion (wax) rim: Marking the occlusion rims : Presented by: Dr. Mai Salah El-Din BDS, Msc, Phd in Removable Prosthodontics