Explains the two senses of occlusion type: Angle's classes I to III, with the molar relationships and overjet and overbite in Class I, then the positions in static occlusion such as centric, myocentric and anterior occlusion. It goes on to the occlusal schemes in lateral movement (canine protected, group function and bilateral balance), with their origins and uses, and closes with good contacts and the harmful contact types: premature, working, non-working and protrusive interferences.
Topic 16 of 75 in the MU Sofia syllabus for Preclinics of Dental Prosthetics (Dental Medicine, Year 2). The free AceMed note covers it in 5 sections, about 114 words (3 min of reading), with 13 flashcards.
In this note
Introduction
Angle's classes
Positions in the static occlusion
Occlusal schemes in movement
Occlusal contacts
Introduction
"Type of occlusion" can mean two things: how the jaws relate front to back (Angle's classes) and which teeth touch when the mandible moves (occlusal schemes). Both shape how a restoration is built.
Angle's classes
In Class I the front teeth overlap by about 2 mm horizontally (overjet) and 2 mm vertically (overbite).
Occlusal schemes in movement
In natural teeth, contacts on the non-working side are interferences. They wear the teeth and overload them, so bilateral balance belongs to dentures only. It occurs naturally in only about 16% of people.
Occlusal contacts
Good contacts
Several stable point contacts on each back tooth in CO, with forces along the long axes.
Smooth gliding contacts during movements that never block the mandible.
Harmful contacts
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