Concepts of Occlusion in Centric Occlusion Position and Organization PDF

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centricRelation Bonerelationship initmostretrotedpostio.no rareinnut.ua teethbutmustappliedinartificaldentur mandible centric centric.cc centricrelation Point centricocclucal maxiumanintercuspation OBJECTIVES Concepts of occlusion in Introduction centric occlusion By the end of the lecture, you should be able to: Concepts of occlusion in position and v v What 'occlusion' is and why it is important Definitions. centric occlusion position INTRODUCTION organization of occlusion v v Difference between natural and artificial Occ. Concepts of occlusion in centric occlusion position. v Balanced Occlusion and Factors affecting it. v Concepts of occlusion (Balanced and Non balanced Occlusion]. Organization of occlusion Presented by: Dr Marwa Kothayer OCCLUSION: CENTRIC This words is used to describe the static contact relationship between the incising or masticating surfaces of the maxillary or mandibular teeth or tooth occur c RELATION OCCLUSAL INTERFERENCE: Any tooth contact that inhibits the remaining OCCLUSAL HARMONY: again A condition in centric and eccentric jaw relation in Irelationbetweenocesurs.ae The relation of the mandible to the maxilla with the mandible occluding surfaces from achieving stable and which there are no interceptive or defective contacts of in its most retruded position. ARTICULATION: occluding surtaces, harmonious contacts. Refers to the static and dynamic contact relationship of maxillary and mandibular teeth as they move against each other during function The Glossary of Prosthodontic 2005 Centric relation cantries.i Eccentric occlusion I A maxillomandibular Centric occlusion Differences between natural relationship, independent of tooth contact, in which It is the relation of opposing It is a term used to denote any contact of the condyles articulate in the anterior-superior position against occlusal surfaces that provides the denture teeth other than centric and Complete the posterior slopes of the articular the maximum planned contact occlusion. eminences; from this unstrained, physiologic, maxillomandibular or intercuspation, artificial occlusion: relationship, the patient sProtrusive occlusion can make vertical, lateral or protrusive movements; it is a centricocclusionisantirortothecentricrelation Lateral occlusion clinically useful, repeatable reference position the occlusal contact the occlusal contact IT IS BONE TO BONE RELATION relationship that exists relationship that exists when when the mandible is moved the mandible is carried GPT-9 (2017) It forward laterally Iii i Pointcentric  in WE 1- In natural dentition à teeth à 2- In natural- dentitions à the teeth receive individual 3- Horizontal (Lateral) forces exerted on natural teeth during are attached to the bone by à pressure of occlusion and can move independently to adjust mastication à affect only the teeth involved. periodontal ligaments à to occlusal pressure. innervated by proprioceptors à provide information to the location of the mandible in space. Étang In artificial teeth non vertical (horizontal) forces affect all the teeth on the base à cause movement on the denture bases that In artificial teeth à teeth are attached to the denture base traumatize the oral supporting tissues. constitute a single unit. In complete artificial occlusion, all the teeth are attached to bases that are seated on slippery soft tissues. The soft tissues vary in thickness, Antonly resiliency, tolerance to pressure and are in a state of constant change. compenetedentureisoncs.tt tissue natural don't teeth have bilateral renren.ci 4- In natural dentition à bilateral balance is rarely found à and 5- Incising with natural teeth does not affect the posterior teeth. 6- In natural teeth à occlusion in centric relation initiate interferences and responses à that direct the a FOR ARTIFICIAL OCCLUSION AXIOMS if present on balancing side à considered interference. mandible into centric occlusion. hmmmm 1. The wider and larger the ridge, the narrower the teeth and closure the teeth are to the ridge, the greater the lever balance. Iindentures p Incising with artificial teeth affects all the Proprioceptors impulses created by closure into centric occlusion à establish memory pattern à that permit ammonia In artificial teeth à bilateral balance is considered necessary for the mandible to return to this centric occlusion 2- The more centered the force of occlusion anterior-posteriorly, the greater the teeth on the base. position away from centric relation. stability of the base denture base stability. 3. Vertical force applied to an inclined occlusal surface and to the supporting tissue, mama causes non-vertical forces on the denture base. gg4- Vertical forces applied to a denture base supported by yielding tissue causes the base to teeter when the force is not centered on the base. 5. Vertical force applied outside (lateral) to the ridge crest creates tipping forces on the base. Concepts of Occlusion ' I- Concepts Of Occlusion In Centric CONCEPTS OF ITmdlIg CONCEPTS 1. Point centric. case 2. Freedom of centric (long get 1- Point centric Position OCCLUSION IN OF centric) centricelution The point centric concept in that in which maximum intercuspation (Centric OCCLUSION Ii- Concepts Of Occlusion In CENTRIC POSITION occlusion) coincides with centric relation. iiiiiiiiii.it Eccentric Position: IN CENTRIC 3. Slide in centric It occurs in about 10% of natural teeth. a. Concepts of balanced occlusion POSITION Applied in complete denture b. Concepts of non-balanced occlusion working centricocc centricRelation  Freedom of centric (long centric or 2. Freedom of centric (long centric or broad Position of Denture occlusion centric): broad centric): The edentulous patients, use the posterior border position (centric relation) à A relatively flat area is created between centric relation and centric Freedom of centric (Long centric): This flat region, having a It is the only constant, repeatable reference position à to provide a stable occlusion positions on the occlusal surfaces of the teeth. denture occlusion and centric occlusion can be made to coincide with it. length of 0.5-1mm, gives the mandible freedom to close in It is created in the natural teeth by occlusal adjustment. mon It can be done for complete dentures By using cuspless teeth or occlusal adjustment. Centric or slightly anterior to it without any interference. iy.y.yyfreethemandibl 3- Slide in centric Of course it is not present naturally but created in the natural teeth Long centric: It is a term used describes an occlusal design that permits free by occlusal adjustment to offer the patient a state he can tolerate. The same can be done for artificial cusp form teeth of complete The two or three dimensional sliding movement that the mandible makes as non interfering gliding of the mandible from centric relation to centric it moves from centric relation to intercuspal position occlusion. dentures where the fossa of artificial teeth may be altered to allow freedom of movement. flatan overje A In this concept a relatively flat area is created between centric relation & When cuspless teeth are used this freedom exists automatically. centric occlusion positions on the occlusal surfaces of the teeth The anterior teeth are arranged to allow this freedom of movement. Slide in centric ORGANIZATION OF THE OCCLUSION Slide in Centric (eccentric slide) ORGANIZATION im It dictates that a maximum number of teeth should OF THE who It is the difference between centric occlusion and (maximum contact in all excursive positions of the mandible. intercuspation) in natural There are three main concepts, which describe the manner in which teeth 1. Bilateral This can be useful in complete denture balanced OCCLUSION dentition is called slide in centric. It is usually of 0.5 - 2.0 mm. in 80% of should and should not contact in the various functional and excursive construction. population. positions of the mandible. Through wear, caries, loss of teeth or poor dentistry, sliding movement 1. Bilateral balanced occlusion. occlusion. Bilateral balanced occlusion in natural dentition will subject the natural teeth on the balancing side that the mandible makes as it moves from retruded contact position to 2. Unilateral balanced occlusion : (group function} ieIoccintirerence to destructive obliquely directed forces intercuspal position i.e. the slide is often a combination of forward and lateral movements, as well as vertical components 3. Mutually protected occlusion : analyze.it a mscie centricocciusoian canine protected moral slidincentric denture qq.fi IIj vertical myp  The objective of occlusal balance is Maximum contact in left working side and Maximum contact in centric occlusion to create bilateral contacts from contact in right non-working side the centric position to all eccentric position, that are free from interference, smooth, uniform and in harmony with movement of the mandible Maximum contact in right working side and At least 3 points of contact during contact in left non-working side protrusion 1-Provide maximum denture stability during 2. Unilateral As cross arch balance is not necessary in natural functional and parafunctional movements of the mandible. balanced teeth, unilateral balanced occlusion calls for all teeth on the working side to be in contact during a 2-Help in distribution of the masticatory occlusion lateral excursion. pressure over the supporting tissues and (group On the other hand, teeth on the nonworking side are contoured to be free of any contact. reduce trauma to the underlying tissues. 3-Increased efficiency of mastication. function} 4-Psychologically it is more comfortable to the patients who enjoy comfort and satisfaction only when eccentric balance is present. real denturs Unilateral occlusal balance The group function group function concept Mutually protected occlusion Maximum contact in working side In which two or more Mutually protected occlusion is also known as Maximum contact at centric occlusion and no contact in non working side or teeth.other than canine protected occlusion, canine rise or organic MAXIMUM CONTACT AT CENTRIC occlusion. OCCLUSION NO POSTERIOR CONTACT DURING PROTRUSION the canines, in contact 3. Mutually The teeth are arranged so that the overlap of the on the working side and anterior teeth prevents the posterior teeth from no balancing contacts protected making any contact on either the working or the non-working sides during mandibular excursions. for either the right or occlusion This separation from occlusion is termed disclusion. left lateral functional excursions (natural occlusion). Mutually protected occlusion References NO CONTACT IN WORKING SIDE Academy of Prosthodontics (2005) ,(2017): The glossary of NO CONTACT IN NON-WORKING SIDE prosthodontic terms, J. Prosthet. Dent. 1- Howat A.P, Capp N.J, Parrett N.V.J: A color atlas of occlusion and mal occlusion. Wolf publishing LTD, London, 1991 2- Dawson P. E: Functional occlusion from TMJ to smile design. Mosby Inc., St. Louis, 2007. 4. Ramfjord SP, Ash MM: Occlusion, ed 4, Philadelphia, 1983, WB Saunders. 5- Thomson H.: Occlusion in clinical practice, Bristol, London and Boston, Whright P.S.G. 1981. 6- Simpson G.W.: On Johnson's Modem Practice in Fixed prosthodontics, 4th. Ed, Philadelphia, Toronto, W.B. Saunders Co., 1986.