Centric Relation .pptx

1. DR MAYANK SINGH
DEPTT. OF PROSTHODONTICS

2. PATIENT INTERVIEW
 Establish rapport with the patient
 Gain insight into the psychological makeup of the
patient
 Explore any physical condition that may effect the
treatment
 Ascertain the patient expectations of treatment

3. STRUCTURE OF INTERVIEW
Dental history - In the dental history it is important to find
out why teeth have been lost.
If lost by caries If lost by
periodontal
disease
Presence of removal partial
Dentures will increase the
possibility of further carious
activity
Every effort must be made to
discover and eliminate its cause

4. DIET
 The patient diet should be evaluated
 If the patient have sugar containing diet a change
must be effected.
 The problem caused by the sugar is compounded by
the wear of removal partial dentures because the prosthesis
shield the microorganism from the cleansing and buffering
action of patient saliva.

5. HABITS
 Patient habit should be evaluated to determine
whether the effect the prognosis of the treatment.
 Bruxism and clenching
 Tongue thrusting

6. EVALUATION OF ORAL HYGIENE
 It is critical to the prognosis of the patient treatment
 Inadequate oral hygiene must be recognized early in
the diagnostic procedure so that a preventive dentistry
programme can be evaluated.

7. EVALUATION OF CARIES SUSCEPTIBILITY
 The presence of large number of restored teeth
 Sign of recurrent caries
 Evidence of decalcification

8. ORAL PROPHYLAXIS
 Supragingival calculus should be removed and oral
prophylaxis should be performed
 The diagnostic cast and definitive intraoral examination
will be more accurate if teeth are cleaned

9. RADIOGRAPH
 Complete series of periapical and a full mouth
radiograph is essential for definitive examination of partially
edentulous patient
 Full mouth radiograph is ideal for screening for
pathological condition

10.  Periapical radiographs helps in determining
1. Crown root ratio of remaining teeth
2. Status of periodontal ligament space
3. Lamina dura of abutment teeth
4. Quantity of bone on the residual ridge in
edentulous area

11. DIAGNOSTIC IMPRESSION AND CAST
 A diagnostic procedure for a partially edentulous
patient must be considered incomplete unless it includes the
evaluation of accurate diagnostic cast.

12. MOUNTED DIAGNOSTIC CAST
Uses includes the following :
 Extruded teeth, low hanging tuberosities, lack of inter
arch space, malposed teeth and defective restoration are
readily apparent.
 They provide a detail analysis of patient occlusion
 Aid in the education of the patient and in presentation
of the treatment planning.
 They provide a permanent dental record of the patient
condition before treatment.

13. Centric jaw relation record
Bone to bone relation
Recorded repeatedly and verified
Best reference point

14. Methods of determining centric jaw relation
 Conventional method
 Bilateral manipulation of the mandible
 Alteration of protrusion and retrusion

16. Media for recording centric jaw relation
 Wax
 Impression pastes
 Plaster of paris
 Dental stone
 Acrylic resin
 Modeling plastic
waxes
 Soft wax
 Hard wax

19. Definitive oral examination
 Evaluation of caries and existing
restoration

20.  Evaluation of sensitivity to percussion
 Tooth movement caused by-prosthesis or
occlusion
 Traumatic occlusion
 Periapical or pulpal abscesses
 Acute pulpitis
 Gingivitis or periodontitis
 Cracked tooth syndrome

21. Evaluation of mobile teeth
 Traumatic occlusion
 Inflammatory changes in periodontal ligament
 Loss of alveolar bone support

22. Splinting of abutment teeth
 Indications
 Remaining teeth have reduced support-
periodontal disease
 Teeth with short ,tapered roots
 Presence of two or three widely spaced
retainable teeth

23. Evaluation of periodontium
 Pocket depth in excess of 3mm
 Furcation involvement
 Deviation from normal color and contour of gingiva
 Marginal exudate
 Abutment teeth have less than 2mm of attached gingiva
Treatment
 Root scaling and planning
 Gingivectomy
 Periodontal flap procedures
 Free gingival grafts

24. Evaluation of hard tissue abnormalities
 Torus palatinus
 Torus mandibularis
 Exostosis and undercuts
 Mandibular tuberosity

25. Evaluation of soft tissue abnormalities
 Labial frenum
 Hypertrophic lingual frenum
 Unsupported and hypermobile gingiva

27. Evaluation of radiographic survey
 Caries
 Existing restorations
 Root fragments and other foreign bodies
 Unerupted third molars
 Abutment teeth
 Root length,size ,form
 Crown/root ratio
 Lamina dura
 Periodontal ligament space
 Bone index areas

29. Evaluation of mounted diagnostic casts
 Interarch distance
 Occlusal plane

30.  Occlusal plane
Irregular occlusal plane
• Enameloplasty
• Extracoronal cast metallic restorations
• Extraction

31. Occlusal interferences
• Bruxism
• Excessive wear of teeth
• Chipping or fracture
• Increased mobility
• Tooth migration
• Injury to TMJ-muscle spasm,pain and joint
symptoms

32. Occlusal equilibration
 Selective grinding or coronal reshaping of tooth with the
intent of equalizing occlusal stress

33. Treat at centric relation or centric occlusion?
 Coincidence of centric relation or centric occlusion
 Absence of posterior tooth contacts
 Situation in which all posterior tooth contacts are to be restored
with cast restorations
 Only a few posterior contacts
 Clinical symptoms of occlusal trauma

34. Diagnostic wax-up
 Provide a guide for tooth preparation
 Indicate problems that may be encountered during
treatment

35. Development of treatment plan
 Phase1
Collection and evaluation of diagnostic data
Immediate treatment to control pain and
infection
Biopsy or referral of patient
Development of treatment plan
Education and motivation of patient

36.  Phase 2
 Removal of deep caries followed by
temporary restoration
 Extripation of inflamed pulp
 Removal of nonretainable teeth
 Periodontal treatment
 Occlusal equilibration

37.  Phase 3
 Preprosthetic surgical procedures
 Definitive endodontic procedures
 Fixed partial denture construction

38.  Phase 4
 Removal partial denture
 Reinforcement of education and motivation

39.  Phase 5
 Postinsertion care
 Periodic recall

40.  Q1. The first step in the diagnostic mounting
procedure is the mounting of the maxillary cast
on a
a) Fully adjustable articulator
b) Semi-adjustable articulator
c) Denar articulator
d)Free plane articulator

41.  Q2. Face bow which requires styli to be placed
on selected points on the face is
a) Whip mix
b) Hanau spring bow
c) Hanau SM
d)Hanau H2

42.  Q3. Beyron’s point is located _ mm anterior to
the posterior margin of the tragus of the ear on
a line to the outer canthus of the eye
a) 11
b) 12
c) 13
d)14

43.  Q4. While adjusting the articulator, the
following setting are followed for condylar
guidance, Bennett guide and incisal table
respectively
a) 30, 15, 0
b) 0, 30, 15
c) 15, 30, 0
d) 30, 0, 15

44.  Q5. Ramfjord and Ash (1971) have stated
that three factors must be controlled in order
to succeed in determining centric jaw
relation. Which one is not among them?
a) Psychologic stress
b) Pain in temporomandibular joints
c) Muscle memory
d) Systemic illness

45.  Q6. In which method of recording jaw
relation does the operator place all four
fingers of his hand on the lower border of the
mandible and thumbs over the symphysis?
a) Bilateral manipulation of the mandible
b) Alternate protrusion and retrusion
c) Both a and b
d) Use of an occlusal splint

46.  Q7. Which of the following is not used to
record centric jaw relation
a) Acrylic resin
b) ZoE paste
c) Dental stone
d) All of the above are used

47.  Q8. While using metal impregnated wax, water
bath temperature kept is
a) 40°C
b) 43°C
c) 45°C
d) 37°C

49. ANSWERS
 1. B
 2. D
 3. C
 4. A
 5. D
 6. B
 7. A
 8. B