denar® articulator system instruction manual - Whip Mix

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Denar Combi II Articulator SystemThe Rationale For SimplicityThe Denar Combi II ArticulatorFinally, a cost effective, top quality articulator that satisfies everyrequirement for accuracy while eliminating unnecessary complexity.The Denar Combi II articulator is the perfect choice for analysis,treatment planning, and completion of even the most complex occlusaltreatment. And it does all this with a time-saving simplicitythat is unmatched in articulators costing much more.The Basis for Combi II SimplicityThe reason for complexity in high-end articulators is based on earlygnathological premises that have since been invalidated. The threepremises that complicated articulator design are:1. Immediate side shift of the condyles required a complex mechanicaladjustment to record a lateral, horizontal shift of the mandible.This requirement became obsolete when it was determinedthat an immediate side shift cannot happen from properly seatedcondyles in centric relation. (Figure 1)Figure 1: The condyles are braced medially in centricrelation. The orbiting condyle must move down topermit any lateral movement of either condyle. Apurely horizontal side shift before any condylar rotationtakes place is not possible. Thus a horizontalside shift adjustment on an articulator has no logicalpurpose. Note how the balancing side condylemust move down before any horizontal shift of eithercondyle can occur.2. The need for precise recording ofprogressive side shift. Precise recordingof the progressive side shift requiresa complex mechanical configurationbuilt into the articulator’s condylar paths.This has traditionally been accomplishedthrough use of pantographic tracings orbite records taken in lateral excursions.The practice resulted from an early gnathologicgoal of bilateral balance of posterior teeth in lateral excursions,an acceptable goal for complete dentures, but contra indicatedfor natural dentitions. Since research has shown that posteriorcontact in lateral excursions is a frequent cause of muscle hyperac-4
Instruction Manualtivity, posterior disclusion of all balancing side contact has becomethe desired goal. Posterior disclusion can be routinely achieved bya simple process that eliminates the need for complex recordingsand costly mechanical paths on the articulator.The Simplified Combi II Solution. Two studies involving morethan 1000 patients showed the maximum horizontal path inclineto be 10˚. By setting the lateral pathway at 15˚ any chance of balancingside occlusal contact can be eliminated. Since there is nevera time when balancing side contact is desired on dentulous patients,separation of all balancing side contact in lateral excursionsis always the goal. There is never a need to change the progressiveside shift on the Combi II articulator.Figure 2. The progressive side shift path is built intothe condylar path on the Combi II. It is contouredto produce slightly more side shift than can occurin a patient. Thus following this path in lateral excursionsguarantees posterior disclusion of all balancingside inclines. It has no negative effect onany other aspect of occlusal harmony.Figure 3. The arrow shows the maximum medialmovement possible by the balancing side condylein the patient. The path shown on the condylarpath of the articulator shows the medial movementthat occurs during the restorative process.This insures posterior disclusion.3. The need for a precise protrusivepath. The requirements for articulator design changed dramaticallywhen research studies and clinical experience determined thatposterior teeth should ideally be discluded the moment the mandiblemoves forward of centric relation (Figure 4). This informationcombined with studies showing the flattest protrusive condylarpath is 25˚ resulted in a major simplification in the restorative process.Since protrusive contact on posterior teeth is never a desiredresult, disclusion can be achieved by setting the condylar path on aflatter angle than the patient’s forward path. There are no negativerepercussions from an arbitrarily flattened condylar path on thearticulator as long as posterior disclusion can be achieved by theanterior guidance in the patient.5
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