Dental Occlusion Introduction PDF

important OCCLUSION NORMAL OCCLUSION DENTAL ARCH FORM The static i...

important OCCLUSION NORMAL OCCLUSION DENTAL ARCH FORM The static i relationship between A situation commonly found in the absence of The geometric shape of the dental arch when ovoid the incising or disease. viewed in the horizontal INTRODUCTION AND masticating surfaces www.waim The normal occlusion plane (square, tapering, of the maxillary or provides 138 occlusal ovoid) DEFINITIONS mandibular teeth or contacts in closure of tooth analogues. 32 teeth It is very seldom, if ever reached. asss no_ iii NORMAL ARC SIZE CLASS I (NORMAL ARCH SIZE) ARCH LENGTH DISCREPANCY ABNORMAL ARCH SIZE TEETH POSITION IN DENTAL ARCH retroded protrotied The arch form of the maxilla The abnormal relationship between the size Small mandible (class II) Large mandible (class III) Certain teeth, because of their size tends to be larger than that of of the mandible and/or maxilla and their are positioned to the lingual or component teeth, especially as viewed and labial aspect of the ideal curve. the mandible. analyzed in the occlusal plane. The labial surface of maxillary This results in the maxillary lateral incisors is more lingually teeth "overhanging" the placed. a mandibular teeth when the The buccal surface of cuspids are teeth are in occlusion. more buccally placed. During mastication, the The buccal surface of the maxillary cheeks, lips and tongue are first molar is positioned to the less likely to be caught. buccal. www.sina  STABILITY OF THE OCCLUSION STABILITY OF THE OCCLUSION VERTICALLY HORIZONTALLY CURVE OF OCCLUSION CURVE OF SPEE Maintenance of tooth position The lip and cheek pressure The average curve The cusps and vertically are dependent on from outside and the tongue established by the incisal ridges of the occlusal and eruptive forces. pressure from inside stabilize incisal edges and teeth tend to As long as all of these forces are the teeth horizontally. occlusal surfaces of display a curved balanced, the teeth and the The neutral zone: The potential CURVATURES OF THE the anterior and alignment when the occlusion will remain stable. Upon tooth extraction, the space between the lips and DENTAL ARCHES posterior teeth in arches are occlusal force is reduced and cheeks on one side and the either arch observed from a the teeth will shift, disrupting a tongue on the other; that area point opposite the previously stable occlusion. or position where the forces first molars. between the tongue and cheeks or lips are equal. Antiryopostingly view side L eationsidegoseantroposti.ly a Iiiii 00 MONSON’S CURVE Each cusp and incisal CURVE OF WILSON The cusp tips in both CURVE OF PLEASURE (ANTI-MONSON) A helicoids curve of COMPENSATING CURVE The curvature of the occlusal plane of REFERENCES Academy of Prosthodontics (2013): The glossary of prosthodontic terms, J. Prosthet. Dent. edge touches or sides of molars in a occlusion that, conforms to a segment of complete dentures, created to permit 1- Howat A.P, Capp N.J, Parrett N.V.J: A color atlas of section through the when viewed in the the surface of a sphere 8 balanced occlusion. occlusion and mal occlusion. Wolf publishing LTD, London, inches in diameter with its frontal plane forms a mediolateral frontal plane, conforms to a curve why 1991 2- Dawson P. E: Functional occlusion from TMJ to smile design. center in the region of the Mosby Inc., St. Louis, 2007. glabella curve (Wilson). that is convex from 4. Ramfjord SP, Ash MM: Occlusion, ed 4, Philadelphia, 1983, Glabella: The smooth the superior view, a-Curve of Wilson curvemade incomplete denture WB Saunders. except for the last compensation 5- Thomson H.: Occlusion in clinical practice, Bristol, London area between the b- Flat occlusal surface eyebrows just above the nose. molars which c-Curve of Pleasuremsn.is there alone and Boston, Whright P.S.G. 1981. 6- Simpson G.W.: On Johnson's Modem Practice in Fixed reverse that pattern. (Anti-Monson) prosthodontics, 4th. Ed, Philadelphia, Toronto, W.B. Saunders Co., 1986.