Canine guidance is disocclusion by the canines of all other teeth in lateral excursion. The basis of canine protected occlusion theory is that canines act as natural stress breakers to guide the mandible.
Reported studies on canine protected occlusion were recorded with canines in edge to edge position, ignoring the functional zone between the intercuspal & edge to edge position.
Review of literature
A study claimed that with canine guided occlusion, functional loading is directed axially by limiting the contacts of posterior teeth by steeper inclines of canine. This results in chewing stroke in more sagittal direction and mastication occurs with pounding motion1 .
A study concluded that canine guided occlusion is associated with low degree of Frankfort-mandibular plane angle and an increased biting force while group function is associated with high degree of Frankfort-mandibular angle and low biting force2 .
A study recorded the functional range of tooth contacts & the amount & nature of contact of natural teeth in lateral glide movement reported that earlier studies on similar aspects have ignored the functional zone between the intercuspal & edge to edge position 3.
A study done on classification system of canine guided & group function occlusal schemes concluded that the static contact classification system is questionable & concluded that a new classification system of occlusal guidance is required considering the dynamic contacts 4.
Objective of the study :
- To determine the range of functional zone between the intercuspal positions & edge to edge position.
-To determine the range of incomplete disocclusion of posterior teeth in canine guided occlusion.
- To determine the range of complete disocclusion of posterior teeth in canine guided occlusion.
B) Material and methods:
Source of data
A total of thirty five subjects will be selected from the student population and the subjects reporting to the out patient department of A B Shetty Memorial Institute of Dental Sciences, Deralakatte, Mangalore , India.
Method of collection of data [ including sampling procedure, if any]
The study is planned as follows :
1. Selection of subjects.
2. Measuring range of incomplete & complete disocclusion.
3. Statistical analysis of the obtained data.
Criteria for selection :
Subjects showing canine guided occlusion.
Subjects with full complement of teeth excluding third molars.
No history of orthodontic treatment.
Angle’s class 1 molar & canine relation.
All subjects above the age of 18 years, as facial growth would be essentially complete.
No history of congenital facial abnormality and facial surgery.