Occlusion in Complete Denture

Occlusion in complete denture

ทพ. ดนั�ย ยอดสุวรรณdanai@kku.ac.th

BASIC OCCLUSAL FORMS 1. Anatomic, balanced occlusion. 2. Semi-anatomic, balanced occlusion. 3. Nonanatomic, balanced occlusion. 4. Neutrocentric occlusion. 5. Lingualized occlusion.

: Balanced or

: Non-balanced

Advantages of Anatomic Occlusion 1. Esthetics. 2. Better penetration of food bolus, 3. Decrease of vertical stresses. 4. Harmony with muscles of mastication and

TMJ during functional and non-functional movements.

Disadvantages of Anatomic Occlusion 1. precise technique required. 2. greater lateral forces 3. more time, not long-lasting, require

occlusal adjustment 4. difficult to tooth position in class II, III, X-

bite

SEMI-ANATOMIC, BALANCED OCCLUSION

Advantages of Semi-anatomic Cusp Teeth 1. Esthetics 2. Good chewing efficiency 3. Balanced occlusion 4. Less lateral forces 5. Functional occlusal balance

Disadvantages of Semi-anatomic Cusp Teeth 1. Same as for anatomic teeth. 2. More difficult to achieve cross arch, cross

tooth balance. 3. Esthetics reduced somewhat by

decreasing the incisal guidance of anterior teeth.

NONANATOMIC, BALANCED OCCLUSION

Balanced occlusion for non-anatomic teeth may be accomplished by:

1.compensating curve 2.tilting the second molar 3.placing the balancing ramp

NONANATOMIC, BALANCED OCCLUSION

compensating curve

NONANATOMIC, BALANCED OCCLUSION

tilting the second molar placing the balancing ramp

Advantages of NonanatomicOcclusion

1. Slightly more esthetic than neutrocentric occlusion.

2. patients with poor neuromuscular coordination,

difficult to obtain precise, repeatable jaw relation records.

Advantages of NonanatomicOcclusion

3. Less time involved in set up and articulation.. 4. patients with cross bite or Class III relationships

and particularly for patients with Class II relationships who move the mandible far forward in functional relationships.

Disadvantages of NonanatomicOcclusion 1. Use of a compensating curve may cause

the same damaging effects as cuspal inclines.

2. Occlusal adjustments are more difficult to accomplish.

NEUTROCENTRIC OCCLUSION "neutralizing cuspal inclines and centralizing

occlusal forces". Position Proportion Pitch Form Number

Advantages of Neutrocentric Occlusion 1. simple and less time consuming. 2. less precise jaw relation records. 3. lateral forces are reduced by eliminating

(neutralizing) cuspal inclines.

Advantages of Neutrocentric Occlusion 4. simpler and easier occlusal adjustments 5. occlusion is not locked 6. good for patients with Class II (Retrognathic),

Class III (Prognathic) and crossbite ridge relations.

7. for the geriatric patient

Disadvantages of Neutrocentric Occlusion 1. least esthetic 2. poor bolus penetration 3. disclusion of the posterior teeth in Class II

patients. 4. can not be balanced in eccentric

excursions.

LlNGUALIZED OCCLUSION A lingualized occlusal scheme can be: 1. Bilaterally balanced. 2. Non-balanced

LlNGUALIZED OCCLUSION

Balanced lingualized class I arrangement

Tooth- to- tooth

Max. Li cusp to central fossa

LlNGUALIZED OCCLUSION

A 20-degree occlusal template being used to generate the occlusal plane

LlNGUALIZED OCCLUSION

Cross-arch contacts during an excursive movement

LlNGUALIZED OCCLUSION

Balanced lingualized class II arrangement

Narrower mand. anterior

Drop mand. first premolar

LlNGUALIZED OCCLUSION

Balanced lingualized class III arrangement

Wider mand. Anterior

Drop max. first premolar

LlNGUALIZED OCCLUSION

Cross-bite, Li cusp plays no role at all

LlNGUALIZED OCCLUSION

Nonbalanced lingualized class I

Blunt max. Li cusp and mand. limited occlusal anatomy

Advantages of LingualizedOcclusion 1. Esthetics 2. Better penetration of the food bolus 3. Decrease of vertical and lateral forces 4. Simpler technique. less precise CR

records 5. Useful in a wide variety of patients

Advantages of LingualizedOcclusion 6. Added stability is gained during

parafunctional movements with a balanced occlusion.

7. Easier to adjust occlusion 8. May be used in Class II, Class III and

crossbite 9. may be used to incorporate many of the

advantages but few of the disadvantages of other occlusal schemes.

SUMMARY AND CONCLUSIONS There is no one ideal occlusal scheme to fit al

l the variety of patient situations and requirements.

There is not clear cut research in occlusion to support one occlusal scheme over another

การสบฟั�นได้�ด้�ล (Balanced Occlusion)

Christensen’s phenomenon

แสุดงว�ธี�ขากรรไกรท��มี�จุดหมีนัเก�ดจุากเสุ�นัท��ลากตั้��งฉากก�บแนัวนั"าคอนัดายล$และแนัวนั"าปลายฟั(นัหนั�าตั้�ดก�นั

แสุดงว�ธี�ขากรรไกรขณะ

สุบย)�นั

แนัวนั"าปลายฟั(นัหนั�าท��มี�ค*ามีากข+�นัจุะท"าให�ว�ธี�ขากรรไกรชั�นั

มีากข+�นั

เสุ�นั AB แทนัว�ธี�ขากรรไกรขณะเป.นัด�านัดลเสุ�นั CB แทนัว�ธี�ขากรรไกรด�านัเด�ยวก�นัแตั้*ท"าหนั�าท��เป.นัด�านัใชั�งานั

ปั�จจ�ยที่��มี�ผลต่�อการสบได้�ด้�ล แนัวนั"าคอนัดายล$ (Condylar guidance) แนัวนั"าปลายฟั(นัหนั�า (Incisal guidance) ระนัาบสุบ (Plane of occlusion) โค�งชัดเชัย (Compensating curve) ความีลาดเอ�ยงของฟั(นั (Inclination of the teeth)

Hanau’ Quints

= K HCG x IG

CC x CA xOOP

= K HCG x IG

CC x CA xOOP

ขอบคณคร�บ