The OPTIMUM crown to root ratio for abutment tooth is:** A. 2:3 B. 1:1

The OPTIMUM crown to root ratio for abutment tooth is:**
A. 2:3  
B. 1:1
by

1 Answer

Answer :

A. 2:3
by

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After making an impression to reline an RPD the dentist notes that the indirect retainers are not resting on the tooth. To avoid this, what process should have undertaken initially: A. Ask patient to bite firmly while impression is setting B. Hold the metal base frame against the abutment tooth while setting C. Fabricate new denture D. Add impression material and close the gap

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.Fluoridation is the adjustment of the fluoride content of a community water supply to optimum levels for caries prevention. Which of the following statement is correct? A. Tooth decay declines by 90% to 95% B. Tooth decay declines by 45% to 55% C. Greater reduction in smooth surface caries from in pit and fissures D. Fluoridation increases vulnerability to osteoporosis

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.Lateral canals are usually found at: A. The middle of the root B. First third of the root close to the crown C. The apical third

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To achieve optimum cavity preparation, which of the following factors of internal anatomy must be considered in root canal treatment: A. Outline form B. The age and shape of pulp chamber; in addition to the direction of individual root canals. C. Internal external relationship D. Intra-coronal preparation E. None of the above

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In cementing Maryland or Roche bridges, the effect is generally to, a. Lighten the colour of the teeth by the opacity of the cement b. Darken the colour of the abutment by the presence of metal on the lingual c. Have no detrimental colour effect. d. Darken the abutment teeth by incisal metal coverage

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What is the relationship of the retentive portion of the partial dentures retainers to the survey line of abutment: A. Gingival /Below/ B. Occlusal /Above/ C. No relation

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To obtain a desired projection of occlusal loads, the floor of the occlusal rest should, A. Be convex B. Slope from the marginal ridge towards contact?? of abutment C. Slope from contact?? of abutment towards the marginal ridge D. Be concave E. Does not slope from the marginal ridge towards contact?? of abutment F. None of the above

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Patient with class II division II; the lateral incisor is missing. You want to make a fixed bridge which of the following is suitable: A. Rocket bridge using central incisor as abutment (rochette bridge resin retained bridge parecido al Maryland B. Cantilever using central incisor C. Fixed bridge using the central incisor and bicuspid

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Periodontal damage to abutment teeth of partial denture with distal extension can best be avoided by, A. Applying Stressbreakers B. Employing bar s on all abutment teeth C. Maintaining tissue support of the distal extension D. Clasping at least two teeth for each edentulous area E. Maintaining the clasp arms on all abutment teeth at the ideal degree of tension

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As far as surgical removal of wisdom teeth is concerned which of the following is true? a- Prophylactic prescription of antibiotic reduces dramatically the chances of infection. b- Raising a lingual flap will increases the incidence of neurapraxia but will reduce the incidence of neurotmesis with respect to the lingual nerve. c- Prophylactic prescription of dexamethasone will dramatically reduce post operative swelling. d- Inferior dental nerve injury is unlikely since the nerve passes medial to the wisdom tooth root. e- The use of vasoconstrictors in local anaesthetics will increase the chances of infection.

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The MOST likely factor contributing to tooth eruption is:** A. The growing root B. Bone growth C. Vascular pressure D. The developing periodontal ligament

Description : The MOST likely factor contributing to tooth eruption is:** A. The growing root B. Bone growth C. Vascular pressure D. The developing periodontal ligament

Last Answer : A. The growing root

How long would it take to notice significant reduction in radiolucency after finishing a root filling in a tooth with a periapical lesion: A. 6 months B. 1 month C. 3 months

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Last Answer : A. 6 months

Where does the bone resorption show in a pulp necrosis of a deciduous molar: A. At the root apex B. At the bifurcation C. On the buccal side of the tooth D. On the lingual side of the tooth

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Last Answer : B. At the bifurcation 

Treatment of gangrenous tooth: A. Pulp capping B. Root canal therapy C. Pulpotomy

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Last Answer : B. Root canal therapy

A child with a fracture of a tooth at the apical third of the root, what would be your first decision: A. Wait and recall after one month and observe for any necrotic or radiolucency B. Root canal treatment C. Extraction D. Apiectomy

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Last Answer : A. Wait and recall after one month and observe for any necrotic or radiolucency

The lamina dura is seen on periapical radiographs as:CHECK A. Usual radiolucency between tooth root and surrounding bone as a thin white line. B. Cribriform plate of bone making the tooth socket C. Dense crestal bone consistent with a healthy periodontal status D. Pattern of radiopaque lines in supporting alveolar bone

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Last Answer : B. Cribriform plate of bone making the tooth socket

As far as surgical removal of wisdom teeth is concerned, which of the following is true?**CHECK A. Prophylactic prescription of antibiotic reduces dramatically the chances of infection B. Raising a lingual flap will increases the incidence of neurapraxia but will reduce the incidence of neurotmesis with respect to the lingual nerve ADC M07 C. Prophylactic prescription of dexamethasone will dramatically reduces post operative swelling D. Inferior dental nerve injury is unlikely since the nerve passes medial to the wisdom tooth root E. The use of vasoconstrictors in local anaesthetics will increase the chances of infection.

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My g/f just broke off a piece of her molar. She already had a root canal done on that tooth and had a temporary filling (been there for awhile). If she can't get a crown in the next month of so, is she in trouble?

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Exposed part of tooth is (a) Neck (b) Root (c) Crown (d) None

Description : Exposed part of tooth is (a) Neck (b) Root (c) Crown (d) None

Last Answer : (c) Crown

“Pop off” of a porcelain veneer from the under the lying gold crown is due to:** A. Too thick application of pure gold surface conditioner B. Contamination at the porcelain metal interface C. Under firing the opaque layer D. All of the above

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Last Answer : B. Contamination at the porcelain metal interface

When should metallic framework not be contaminated during the fabrication of a porcelain fused to metal crown: A. Between bisque stage and glazing stage B. Between preheat and opaque stages C. Between opaque and bisque stages D. Between one opaque and two opaque stages

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A 8 years-old patient has 3 first premolars erupted and a swelling on the ridge of the un-erupted premolar. X ray shows a fully developed crown and ¾ roots development with no other pathology. What is your management: A. Remove the dentigerous cyst B. Soft tissues recision to allow eruption C. Soft tissues recision accompanied with orthodontic appliance to help with eruption

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The major cause of jacket crown breakage is, A. Inclusion of platinum foil B. Use of weak cementum C. Voids of porcelain D. Porcelain is thinner than 1mm

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Which one of the following is the major disadvantage of stone dies used for crown fabrication, A. They lack accurate reproduction of surface details B. Their overall dimensions are slightly smaller than the original impression C. The strength of the stone D. The hazard of aspiration of toxic materials during trimming of the dies.

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An impression with elastomer in custom tray has been taken for crown preparation; it will be two days before the impression gets to the laboratory for construction of the crown. Which impression material is preferred? A. Polyether B. Thiokol or meraptan rubber C. Condensation silicone D. Vinyl polysiloxane

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Last Answer : D. Vinyl polysiloxane

What statement is false: A. Not to survey when making the crown

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Last Answer : A. Not to survey when making the crown

.When correction preparation for re contouring of occlusal surface is to be applied, grinding only of the adjusted surface: A. Should not be felt flat B. Requires a flat crown C. Requires no contact with adjacent teeth D. Should be felt flat

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When primary molars are prepared for stainless steel crowns, should the depth for reduction of the proximal surface be similar to the depth of the buccal and lingual surfaces? A. Yes; reduction of all wall is similar for best retention B. No, proximal reduction is greater to allow the crown to pass the contact area C. No, the buccal surfaces has the greatest reduction to remove the cervical bulge D. Yes, all undercuts are uniformly removed so that the steel crown can be seated E. No, because of lateral constriction, the lingual surface needs greatest reduction

Description : When primary molars are prepared for stainless steel crowns, should the depth for reduction of the proximal surface be similar to the depth of the buccal and lingual surfaces? A. Yes; reduction ... can be seated E. No, because of lateral constriction, the lingual surface needs greatest reduction

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What is the best way to get an optimum adoption of ceramic to metal, A. Slow firing B. High compression

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Optimum penetration of a .024 or .031 inch self-threading pin in dentin is . . . a. 0.5 mm b. 1.0 mm c. 2.0 mm d. 2.5 mm e. 3.0 mm

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