Interdental relations. = c ontact between neighboured teeth and teeth in oppposite dental arches , if they are in contact . Interdental relations : horizontal vertical ( horizontally , approximally ) ( vertically , occlusallly ) contact points intercuspidation.
= contactbetweenneighbouredteeth and teeth in opppositedentalarches , ifthey are in contact.
(horizontally, approximally) (vertically, occlusallly)
Vertical interdental relationship = teeth in ideal position make contact between cusps and opposite fissures of opposite dental arch.
Inclination of distal teeth :
– status when cusps of one dental arch are in contact in intercuspal fissures of opposite dental arch.
– between upper and lower teeth is maximal number of contacts. Chewing movement is stopped.
– during habitual occlusion teeth are in intercusp position .
( former named as a articulation )
– status when cusps of one dental arch glide on group of cusps of opposite teeth,
– maxilla and mandible are in motion and grind the food.
= slant of cusps , borders and fissures on occlusal surfaces premolars and molars.
Inclination of slants conditione lateral line of mandible during mastication. Anterio-posterior line is done by inclination of palatal surface of upper incissors and canines. Under dominant participation is distinguished incissal line or canine line.
Factor 2 :
inclination of dorsal slant of articular cusp of TMJ and on this perpendicular roof-like shape of TMJ - head.
Factor 3 :
active factor is represents by masticatory muscles.
On cusps are prominentiaeof different shapes :
Status where on periodontiumdeveloppathologicchanges by influenceofhigherforces on occlusaltoothsurface.
Theforceofishigherthanperiodontiuniscapable to transport withouttissuedamage.
higher power⇨ healthy periodontium
higher power ⇨ diseased periodontium
physiologic power ⇨ diseased periodontium
– they are differenceswhenprimaryarepresent
inflammation or atrophy.
3) Combined Occlusal Trauma: Injury from an excessive occlusal forceon a diseased periodontium
In this case, there is gingival inflammation,some pocket formation, and the excessive occlusal forces are generally from parafunctional movements.
1.Examination of centric occlusion : determine premature teeth contact and after position of occlusal contact
2. Wax bite
4. Clinical examination :
abrased fasets on occlusal tooth surface, anemisation of gingiva around affected tooth, anomal tooth position
7.Determination of frontal and lateral occlusion = biting on incisal edge of incissors and on left and right cusps – movement of mandible anteriorly or laterally = in contact are only the teeth which guided surfaces are longer and other teeth are not in contact .
The sum of these surfaces is called as occlusal field.
distance between basis of upper and lower vestibulum oris(fornices vestibuli oris )measured in frontal area in the position of maximal intercuspidation
Means any contact between teeth of upper and lower dental arches.
static occlusion dynamic occlusions
(habitual intercuspidation) (former articulation)
Static occlusion – habitual intercuspidation
– - condition where cusps of the teeth in one dental arch inclinate ( fall) into intercuspidal fissure of the teeth in opposite dental arch.
– condition where cusps of the teeth in one dental arch glide on the group of cusps of opposite teeth.
forward movement ,is relatively short. In centric occocclusion lower incissors are moved on palatinal surfaces of upper incissors , in direction downword until incissal edges