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PROSTHODONTIC MANAGEMENT OF THE CURVE OF SPEE : USE OF BROADRICK FLAG : 

PROSTHODONTIC MANAGEMENT OF THE CURVE OF SPEE : USE OF BROADRICK FLAG LYNCH & McCONNELL J PROSTHET DENT 2002; 87: 593-597

CURVE OF SPEE(eponym for Anteroposterior Curve) : 

CURVE OF SPEE(eponym for Anteroposterior Curve) THE ANATOMIC CURVE ESTABLISHED BY THE OCCLUSAL ALIGNMENT OF THE TEETH, AS PROJECTED ONTO THE MEDIAN PLANE, BEGINNING WITH THE CUSP TIP OF THE MANDIBULAR CANINE & FOLLOWING THE BUCCAL CUSP TIPS OF THE PREMOLAR & THE MOLAR TEETH,

Slide 3: 

CONTINUING THROUGH THE ANTERIOR BORDER OF THE MANDIBULAR RAMUS ENDING WITH THE ANTERIOR MOST PORTION OF THE MANDIBULAR CONDYLE. 1ST DESCRIBED BY FERDINAND GRAF SPEE, IN 1890 GERMAN ANATOMIST

Slide 4: 

THIS CURVE EXISTS IN SAGITTAL PLANE & IS BEST VIEWED FROM A LATERAL ASPECT PERMITS TOTAL POSTERIOR DISCLUSION ON MANDIBULAR PROTRUSION (GIVEN PROPER ANTERIOR TOOTH GUIDANCE)

CURVE OF SPEE : 

CURVE OF SPEE

Slide 6: 

CENTER OF CURVE – ALONG A HORIZONTAL LINE THROUGH THE MIDDLE OF THE ORBITS BEHIND THE CRISTA LACHRYMA POSTERIOR (VERTICAL RIDGE ON THE LACRIMAL BONE GIVING PARTIAL ORIGIN TO THE ORBICULARIS OCULI MUSCLE)

Slide 7: 

SPEE’s IDEA WAS ADVANCED 1920 BY GEORGE MONSON HE DESCRIBED A 3-D SPHERE THAT PASSED THROUGH THE INCISAL EDGES & OCCLUSAL SURFACES OF THE MANDIBULAR TEETH

Slide 8: 

SPEE – CURVE OF APPROX. 2.5-INCH RADIUS (6.5-7.0 cm) MONSON – CURVE OF 4-INCH RADIUS (NOW WIDELY ACCEPTED) SPEE – LOCATE CENTER BY RECONSTRUCTION & MEASUREMENT WITH THE COMPASS

BROADRICK FLAG : 

BROADRICK FLAG RECONSTUCTION OF CURVE OF SPEE IN HARMONY WITH ANTERIOR & POSTERIOR GUIDANCE ALLOWS POSTERIOR DISCLUSION ON PROTRUSION ANTERIOR GUIDANCE MUST SET PRIOR

DISCUSSION : 

DISCUSSION BROADRICK FLAG IS USEFUL COMPROMISE CAN BE DONE IN ALTERING THE LENGTH OF RADIUS ( STANDARD 4-INCH ) IN RETROGNATHIC – FLAT CURVE – POSTERIOR PROTRUSIVE INTERFERENCES HENCE 3.75 INCH

Slide 18: 

IN CLASS III SKELETAL RELATIONSHIP – 4 INCH RADIUS – STEEP CURVE – POSTERIOR INTERFERENCES HENCE 5-INCH RADIUS IS SUITABLE

Slide 20: 

CENTER COULD BE MOVED ANTERIOR OR POSTERIOR ON LONG ARC DRAWN FROM ASP IT WILL NOT AFFECT THE POSITION OF THE ASP, SO, NOT AFFECTING ESTHETICS & FUNCTION

Slide 21: 

IF CENTER ALTERED FOR ESTHETICS – NO NEW INTERFERENCES NEEDLES – POSTERIOR DISCLUSION ON MANDIBULAR PROTRUSION PSP – LEVEL & ORIENTATION OF DISTAL MOLAR IS NOT SUITABLE, THEN ANTERIOR BORDER OF CONDYLE (MOST ANTERIOR POINT ON THE CONDYLAR ELEMENT)

Slide 22: 

CARE – THAT THE ANGLE OF CONDYLAR GUIDANCE IS NOT LESS THAN CURVE OF SPEE – PROTRUSIVE INTERFERENCES MANDIBULAR MOLARS HAVE SLIGHT LINGUAL INCLINATION & BUCCAL CUSPS ARE HIGHER THAN THE LINGUAL – CURVE OF WILSON IT FACILITATES LATERAL EXCURSIONS

Slide 23: 

MONSON – MANDIBULAR TEETH, ARRANGED TO CLOSE AROUND A SPHERE OF 4-INCH RADIUS INCISAL EDGES & CUSP TIPS TOUCHING THE SPHERE PERMITTING EXCURSIONS FREE OF POSTERIOR INTERFERENCES

Slide 24: 

INAPPROPRIATE POSTERIOR TOOTH CONTACTS – HYPERACTIVITY IN TEMPORALIS & MASSETER SO, PROPER ANTERIOR GUIDANCE EXCURSIVE INTERFERENCES – MAY RESULT IN WEAR, FRACTURE OF RESTORATIONS &TEMPOROMANDIBULAR JOINT DYSFUNCTION

Slide 25: 

ACRYLIC TEMPLATE – FACILITATE CONTROLLED CONSERVATIVE REDUCTION VITAL TOOL FOR TRANSFERRING DESIGNED BLUEPRINT FROM THE DIAGNOSTIC WAX-UP ACCURATE REDUCTION OF EXTRUDED MANDIBULAR 1ST MOLAR

SUMMARY : 

SUMMARY CURVE OF SPEE FREE MANDIBULAR EXCURSIONS DIAGNOSTIC WAX-UP, ACRYLIC TEMPLATE, & DUPLICATION OF PROVISIONAL MOST IMPORTANT HARMONISED OCCLUSION