Effect of the change on the lateral pattern to group function and the inhibition of the periodontal propioception in subjects with canine guidance

Objectives: To evaluate the effect of a lateral pattern modification and the periodontal propioception inhibition in subjects with canine guidance. Methods: In 5 subjects with canine guidance their electromyography activity (EMG) of the masseter (M), temporalis (T) and digastric (D) muscles were registered in rest, clenching in maximum intercuspal (MI) and lateral position, besides unilateral chewing (UC) with soft (SF) and hard food (HF). Every register was taken under four conditions: 1)canine guidance (CG), 2)artificial group function (AGF), 3) Canine Guidance with propioceptive inhibition of canine (CGa) and 4) Artificial Group Function with propioceptive inhibition of canine and posterior teeth (AGFa). Results: It was not evidenced significant differences in rest and lateral clenching position. The rest of results will be summarized in the following table:

*=p<0.05, R=right, L=left, pos/mus=position/muscle

Conclusions: The increment of posterior contacts will reduce the masseter and temporalis activity in chewing, mainly in the non-work side. The canine propoception have a regulating action in functional and non-functional positions when activate the temporalis bilaterally. This function is enhanced in mastication.