The Tip-Edge Appliance-Philosophy and TechniqueDr. Angshuman Bhattacharya

The Evolution1907(extraction and tipping)

1910 (nonextraction, pin and tube)

.Hunt for 3-D Control

1915 (Ribbon arch appliance)

1925 (Edgewise Backets : Tie brackets)

Strang (1933) broke the continuityStrang (1941)- As soon as this mechanism was brought to use no longer were the molars the only anchor teeth-infact, each and every tooth is an anchorage auxiliary

And the fight to overcome this problem continued.

The Edgewise bracket is extremely violent in its action.A.V. Sved1938

Tip back bends, anchorage preparation, no brackets on selected teeth, headgearTweed

Kesling kept archwire out of the slot while retracting with coil spring

Begg changed to Ribbon arch brackets

Segmented arches.Burstone

Andrews warned against engaging the incisor slots before correcting canine angulationsRoth executed slight tipping of crowns during extraction

Kesling created the Tip edge slot by modifying the Edgewise slot..1987

The tip edge slotPropeller design: Engagement and Stepping upWingsVertical slot Single point contact prevents undesirable force couples during intrusionContiguously reciprocal uprightingNo bowing

Prescription

Prescription

The concept and functionBite opening

The concept and functionRetraction and space closure without loss of vertical control

The concept and functionPropeller slots

The concept and functionAnchorage considerationNo binding so no frictionFeatherlight elastics can do the work of retracting 6, 8 or even 10 teethArchwire move distally so no sliding frictionLesser mesial root tipping than second order bends

The concept and functionInterbracket distance

The concept and functionAxial control is selective , limited and physiologic

Differential Straight Arch TechinqueStage ISimultaneous correctionOnly stage when archwires directly do the job..Goals of Stage IVertical correction Horizontal correctionAlignment

Simultaneous correction

Differential Straight Arch TechniqueBite opening mechanics

Differential Straight Arch TechniqueOverjet and underjet correctionBite with jetNo Interarch elastics if bite is openOutrigger appliance

Differential Straight Arch TechniqueForce vectors for intruision and retraction mechanics

Differential Straight Arch TechniqueAnterior alignmentExtraction cases: elastomeric tiesNonextraction:Vertical loopsRotations: Springs

Differential Straight Arch TechniqueStage IIGoals:Close remaining posterior spacesCorrect or maintain dental midlinesCorrect posterior crossbitesAchieve class I molar occlusionOver rotate severely rotate premolarsLevel anchor molars(if tipped distally)Maintain all corrections achieved during Stage I

Differential Straight Arch TechniqueArchwires:Archwires are passiveMild bite opening sweepsIn mild to moderate anchorage situation: Occlusal tubeIn Maximum anchorage:gingival round tube

Differential Straight Arch TechniqueAutomatic canine rotational Control during retraction

Differential Straight Arch TechniqueStage II BrakesSidewindersRectangular wires

Differential Straight Arch TechniquePre-stage ThreeLevel PMsDerotate and align anchor molarsLevel occlusal plane

Differential Straight Arch TechniqueStage IIIGoals:Achieve final axial inclinations Maintain all corrections achieved during stages I and II

Differential Straight Arch TechniqueStage IIIArchwires are stabilizers onlyBrackets keep control over uprighting and torquingClass II or II elastics worn as necessaryDistal ends bent

Differential Straight Arch TechniqueAuxiliaries do the main work and their action is self limiting due to the slot design

Differential Straight Arch Technique