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Non-working posterior interference causes non-working side joint and disc strain |
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| Upon engagement of a posterior interference following slight translation, the temporalis can maximize contraction intensity.
With the resistance to the ipsilateral LP being anterior, the strain provided is inconsequencial, as it braces the condyle against the eminance. However, the superior head of the LP contracts simultaneously with the temporalis, thereby creating considerable compaction and strain to the disc and condylar head.
Above, the practitioner focuses on the canine rise, and may miss the contralateral posterior resistance.
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| How the Class III occlusal scheme allows joint strain in excursive movments |
| In the event there is a parafucntional excursive movement with the Class III occlusal scheme (in the absence of canine rise, which would thereby disclude the posterior teeth), one condyle translates, while the other pivots. The loction of the resulting posterior contact dictates the potential activity of the superior belly(s) of the Lateral Pterygoid(s), and the strain/conpaction placed on the condyle/disc assembly. |
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