In this theory, all teeth contact in maximum intercuspation and during eccentric mandibular movements
the molars did not contact during eccentric movement, but in maximum intercuspation they contacted while anterior teeth had no contact and posterior teeth protect anterior teeth
This type of occlusion occurs when all facial ridges of working side teeth contact the opposing dentition, while the non working side teeth do not contact
Balanced occlusion
Mutually protected occlusion
Group function occlusion
Balanced Occlusion (Cusp Occlusion ):the contact between the opposing surfaces of any two teeth occurs in three dimensions, These dimensions the width, length, and the depth of the occluding surface
ADVANTAGES OF BALANCED OCCLUSION:1 – Fenestration of food is easy.2 – Resists the rotation of the denture base.3 – Provides better esthetics.4 – Acts as a guide for proper jaw closure.DISADVANTAGES OF BALANCED OCCLUSION:1 – More occlusal disharmony during setting which is difficult to adjust.2 – Increases horizontal forces.3 – Difficult to adapt to abnormal jaw relationship.
the incisal guidance angle and the sagittal condylar guidance angle value
As in protrusion the movement under the influenceThe anterior determinant canine guidance angle
The posterior determinant is, Medial condylar guidance angle Lateral condylar guidance angle
Monoplane or Non anatomical occlusion
The arrangement of teeth by which they are positioned in a single plane. The maxillary, and mandibular teeth are arranged without vertical overlap. The maxillary posterior teeth are set first, and the occlusal plane must fulfill certain requirements: It should result in an occlusal plane that evenly divides the space between the maxillary, and mandibular ridge. It should provide an occlusal plane that parallels the mean denture base foundation. The plane should fall at the junction of the upper , and the middle thirds of the retromolar pads.ADVANTAGES OF MONOPLANE OCCLUSION
No lateral component can be generated with vertical closing, i.e. achieve stability. Freedom in centric occlusion( the mandible is not locked in centric relation due to that there is no cusp, and the patient can move the jaw forward, and laterally. It is used in Class II, and III jaw relations.DISADVANTAGES OF MONOPLANE OCCLUSION
Decreases chewing efficiency. Esthetic is affected in both anterior, and premolar regions. The anterior teeth can not be set in overbite, and overjet, they have to be set in almost edge to edge.First described by Payne, (1941), this form of denture occlusion articulates the maxillary lingual cusps with the mandibular occlusal surfaces in centric working and nonworking mandibular positions.
It is termed lingualized articulation because of the semantic terminology of American English, in which the inner cusps of maxillary and mandibular teeth are termed the lingual cusps , British English palatal cusp contact articulation
The only exception is a very slight mesio-distal adjustment of the lower posterior teeth, so that the upper palatal cusps contact the fossae of the lowers, and will not contact any lower marginal ridges
In excursive movements, the lower occlusal surfaces are adjusted so that contact with the upper palatal cusp is retained at all times
P: protrusive; WS: working side; NWS: nonworking side. (Murrell, 1974).
This concept has been called “an occlusion for all reasons” and rightly so easier to make than with a fully balanced articulation using cusped teeth,
this occlusal scheme is now frequently used in fixed implant prostheses
This concept has one disadvantage is when there may be an aesthetic imperative to provide well-defined buccal cusps in such a way that they must be involved in the articulations been called “an occlusion for all reasons” and rightly so
Concepts of Natural occlusion
In maximum intercuspation: , there is contact between all maxillary & mandibular teeth , anterior, & posterior. In protrusive movement, there is contact between the incisal edge of the maxillary & mandibular teeth , anterior, & posterior. In lateral movement, the side toward which the mandible moves , is called the ( working side) ,the upper lingual cusps contact the lower cusps. The other side is called the (balancing side ) where the upper buccal , and lingual cusps contact the lower buccal and lingual cusps respectively. It is difficult to find balanced occlusion in natural teeth, it may be present but not in the majority of people.
Balanced Occlusion:
2. Mutually Protected Occlusion : In maximum intercuspation, the posterior teeth protect the anterior teeth. In protrusion, the anterior teeth contact in the incisal edges protecting the canines, and posterior teeth which have no contact. In lateral movement, the upper & lower canines contact with each other, protecting the anterior, & posterior teeth. i.e. there is no contact between the anterior, & posterior teeth.
3. Group Function Occlusion : The anterior& posterior teeth have full contact on the working side, while there is no contact on the non working, or balancing side. i.e. the occlusal lateral pressure is distributed to all the working side teeth.