DENAR® TRACK II SYSTEM - Whip Mix

16IMMEDIATE SIDESHIFT1. Arbitrary adjustment. Setting thisadjustment to zero provides for tightcoupling of the centric holding cuspsin the position of maximum intercuspation.Increasing the immediate sideshiftadjustment in treatment providesfor greater lateral freedom in the positionof maximum intercuspation.For example:0 mm = tight intercuspation0.5 mm = slight lateral freedom1.0 mm = moderate lateral freedom1.5 mm = greater lateral freedom2. Lateral checkbite method. Condylarpath of movement studies* haveshown that in almost all patients oncethe immediate sideshift has occurredthe orbiting (balancing) condyle movesforward on a path inclined 7° mediallyto the saggital plane (progressive sideshift).*Luncleen, Harry C. and Wirth, CarlG. Condylar Movement PatternsEngrated in Plastic Blocks, Journal ofProsthetic Dentistry, December 1973,pages 870-873.Therefore in this technique, due to inherentdifficulties and potentials for errorin obtaining accurate lateral checkbiterecords and setting the articulator tothese records, more accurate results canbe achieved by assuming the patient hasa progressive sideshift of 7° and usingthe lateral records only to set the immediatesideshifts.When setting the immediate sideshiftadjustment to lateral checkbite records:a. Set both sides of the articulator to thefollowing adjustments:Progressive Sideshift: 7° lockedProtrusive: 30° unlockedImmediate sideshift: 2 mm (screwsturned counterclockwisetwofull revolutions).b. Seat the right lateral checkbite recordbetween the casts with the articulatorin a right lateral mandibular bow position.While maintaining a slight pressureon the bows, rock the left protrusivepath adjustment back and forthuntil the most accurate seating of thecast into the record is achieved. (Thisprocedure must be done very carefullyso as not to modify the record.) Onoccasion you will note that the castwill not seat accurately on the rotatingside. (In this instance, right side.)This is because the patient’s rotatingcondyle may have also moved up ordown and backward or forward as itmoved out and this condylar positionwas reflected in the checkbiterecord. However, seat it as accuratelyas the articulator will allow. To setthe immediate sideshift turn the rightadjustment screw clockwise with thekey provided until the screw headlightly touches the lateral aspect ofthe condylar element. Now removethe checkbite record and lower theincisal pin to disengage the posteriorteeth and lock it in this position. Withthe key provided turn the immediatesideshift adjustment screw clockwiseand count the revolutions required toachieve the most close position. Thethread of the screw provides for 1 mmof immediate sideshift for each complete360° revolution. A quarter turn(90°) represents 0.25 mm of immediatesideshift. Now the measurement hasbeen made and should be recordedon the patient’s record. Resetting the