A Study of the Relationship between the Kind of Lateral Tooth Guidance and Temporomandibular Joint Clicking

Document Type : Original Article


1 Department of Physiology, Physiology Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.

2 Department of Orthodontics, Dental School, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.

3 General Dentist

4 Department of Prosthodontics, Dental School, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran

5 Dentistry Student, Dental School, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.


Background and Objectives: Clinical observations have indicated that lateral working side contacts can produce a posterior shift of working side condyle, resulting in pain and disk displacement in the temporomandibular joint (TMJ).  The contact of distal incline of maxillary canine and mesial incline of the buccal cusp of the mandibular first premolar has been postulated as a possible cause of TMJ clicking. The aim of this study was to examine influence of lateral tooth guidance on TMJ clicking and its etiologic factor.
Subjects and Methods: One hundred subjects from students and nurses at dental school of Ahvaz university were voluntarily recruited and divided into 50 symptom-free subjects (control group) and 50 patients with TMJ clicking. The data of examination and interview were recorded in a questionnaire and analyzed with SPSS and Square-Chi.
Results: 34% of patients had clicking in the right side and lateral retrusive guidance in the right side (P=0.009); and 66% of patients with TMJ had clicking in the left side and lateral retrusive guidance in the left side (P=0.000). In the control group (12%) had lateral retrusive guidance in the right side and 10 % had LR guidance in the left side The most important etiologic factors of TMJ were interferences followed by micro trauma and wear facet.
Conclusion: According to the results of the study there is a significant relationship between lateral retrusive guidance and clicking in the TMJ


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