What does enamel cover ? (1) Crown of the tooth (2) Dentin on all sides (3) Cementum (4) Cementum and partly dentin

What does enamel cover ? (1) Crown of the tooth (2) Dentin on all sides (3) Cementum (4) Cementum and partly dentin
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Crown of the tooth
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What does enamel cover? (1) Crown of the tooth (2) Dentin on all sides (3) Cementum (4) Cementum and partly dentin

Description : What does enamel cover? (1) Crown of the tooth (2) Dentin on all sides (3) Cementum (4) Cementum and partly dentin

Last Answer : (1) Crown of the tooth Explanation: The basic unit of enamel is called an enamel rod which is a tightly packed mass of hydroxyapatite crystals in an organized pattern. In cross section, it is best compared ... the crown of the tooth, and the bottom, or tail, oriented toward the root of the tooth.

Odontogenic cysts develop from the following structures except: A. Reduced enamel epithelium of tooth crown B. Dental lamina dura C. Epithelium trapped after sutures D. ertwig’s root sheath

Description : Odontogenic cysts develop from the following structures except: A. Reduced enamel epithelium of tooth crown B. Dental lamina dura C. Epithelium trapped after sutures D. ertwig’s root sheath

Last Answer : C. Epithelium trapped after sutures

When you try to seat a crown on a tooth you find a discrepancy of 0.3mm at the margin; you will: A. Reduce inner surface of crown B. Remake a new crown C. Smooth the enamel at the margin D. Hand burnish crown margins

Description : When you try to seat a crown on a tooth you find a discrepancy of 0.3mm at the margin; you will: A. Reduce inner surface of crown B. Remake a new crown C. Smooth the enamel at the margin D. Hand burnish crown margins

Last Answer : B. Remake a new crown

A crown casting with a chamfer margin fits the die; but in the mouth the casting is open approximately 0.3mm. A satisfactory fit and accurate physiological close of the gingival area of the crown can BEST be achieved by: A. Hand burnishing B. Mechanical burnishing C. Using finishing burs and points to remove the enamel margins on the tooth D. Making a new impression and remaking the crown E. Relieving the inside of the occlusal surface of the casting to allow for further

Description : A crown casting with a chamfer margin fits the die; but in the mouth the casting is open approximately 0.3mm. A satisfactory fit and accurate physiological close of the gingival area of the crown ... the crown E. Relieving the inside of the occlusal surface of the casting to allow for further

Last Answer : D. Making a new impression and remaking the crown

The minimal labial tooth reduction for satisfactory aesthetics with porcelain fused to metal crown is, A. 1mm B. The full thickness of enamel C. 1.5 mm D. 2.5mm E. One third of the dentine thickness

Description : The minimal labial tooth reduction for satisfactory aesthetics with porcelain fused to metal crown is, A. 1mm B. The full thickness of enamel C. 1.5 mm D. 2.5mm E. One third of the dentine thickness

Last Answer : C. 1.5 mm

The final deposition of ameloblasts occurs in:** A. Primary enamel cuticle B. Secondary enamel cuticle C. Acquired enamel cuticle D. Cementum

Description : The final deposition of ameloblasts occurs in:** A. Primary enamel cuticle B. Secondary enamel cuticle C. Acquired enamel cuticle D. Cementum

Last Answer : A. Primary enamel cuticle

Which of the following statements is true: A. Last secretion of odontoblast forms cementum B. Last secretion of odontoblast forms acquired enamel cuticle C. Remnants of ameloblasts form primary enamel cuticle D. Remnants of odontoblasts form primary enamel cuticle

Description : Which of the following statements is true: A. Last secretion of odontoblast forms cementum B. Last secretion of odontoblast forms acquired enamel cuticle C. Remnants of ameloblasts form primary enamel cuticle D. Remnants of odontoblasts form primary enamel cuticle

Last Answer : C. Remnants of ameloblasts form primary enamel cuticle

Which is the only dental tissue that loses its formative cells as it matures: A. Enamel B. Dentine C. Pulp D. Cementum

Description : Which is the only dental tissue that loses its formative cells as it matures: A. Enamel B. Dentine C. Pulp D. Cementum

Last Answer : A. Enamel

Which one of the following statement is correct, A. The remnants of Ameloblast contribute to the primary enamel cuticle B. the last secretion of the odontoblast is cementum X C. The last secretion of the ameloblast is the acquired of enamel cuticle D. The remnants of odontoblast form the primary enamel cuticle

Description : Which one of the following statement is correct, A. The remnants of Ameloblast contribute to the primary enamel cuticle B. the last secretion of the odontoblast is cementum X C. The ... ameloblast is the acquired of enamel cuticle D. The remnants of odontoblast form the primary enamel cuticle

Last Answer : A. The remnants of Ameloblast contribute to the primary enamel cuticle

Using fluoride in the root surface caries is to protect, A. Enamel B. Dentine and cementum C. Cuticle

Description : Using fluoride in the root surface caries is to protect, A. Enamel B. Dentine and cementum C. Cuticle

Last Answer : B. Dentine and cementum

which one of the following statement is correct, A. The remnants of Ameloblast contribute to the primary enamel cuticle B. the last secretion of the odontoblast is cementum C. The last secretion of the ameloblast is the acquired of enamel cuticle D. The remnants of odontoblast form the primary enamel cuticle

Description : which one of the following statement is correct, A. The remnants of Ameloblast contribute to the primary enamel cuticle B. the last secretion of the odontoblast is cementum C. The last ... is the acquired of enamel cuticle D. The remnants of odontoblast form the primary enamel cuticle

Last Answer : A. The remnants of Ameloblast contribute to the primary enamel cuticle

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

Description : 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

Last Answer : D. Porcelain is thinner than 1mm

In a spherical dome the hoop stress due to a concentrated load at crown is (A) Compressive everywhere (B) Tensile everywhere (C) Partly compressive and partly tensile (D) Zero

Description : In a spherical dome the hoop stress due to a concentrated load at crown is (A) Compressive everywhere (B) Tensile everywhere (C) Partly compressive and partly tensile (D) Zero

Last Answer : Answer: Option B

Was my father right in saying electric toothbrushes remove tooth enamel?

Description : Was my father right in saying electric toothbrushes remove tooth enamel?

Last Answer : No more so, I’m guessing, than extremely aggressive brushing with a regular toothpaste. My dentist recommends soft toothbrushes but okays my using my electtric if I use a soft tip—which I do. Also, my electric has a built-in timer.

Tooth enamel is the hardest substance found in the human body. What is it made up of - (1) Calcium carbonate (2) Limestone (3) Calcium phosphate (4) Calcium fluoride

Description : Tooth enamel is the hardest substance found in the human body. What is it made up of - (1) Calcium carbonate (2) Limestone (3) Calcium phosphate (4) Calcium fluoride

Last Answer : (3) Calcium phosphate Explanation: The protective layer around your teeth, called enamel, is the strongest substance that our body produces. In fact, tooth enamel is stronger than any other substance on earth except for diamonds.

Which is the hardest substance in the human body? A. Tooth enamel (Answer) B. Skull C. Knee cap D. Rib

Description : Which is the hardest substance in the human body? A. Tooth enamel (Answer) B. Skull C. Knee cap D. Rib

Last Answer : A. Tooth enamel (Answer)

The nature of calcium phosphate present in tooth enamel is (a)Basic (b)Acidic (c ) Neutral (d) Amphoteric

Description : The nature of calcium phosphate present in tooth enamel is (a)Basic (b)Acidic (c ) Neutral (d) Amphoteric

Last Answer : (a)Basic

Tooth enamel is made up of: a) Potassium b) Calcium carbonate c) Calcium phosphate d) Calcium oxide

Description : Tooth enamel is made up of: a) Potassium b) Calcium carbonate c) Calcium phosphate d) Calcium oxide

Last Answer : c) Calcium phosphate

The layer of cells that secrete enamel of tooth is (a) osteoblast (b) odontoblast (c) dentoblast (d) ameloblast.

Description : The layer of cells that secrete enamel of tooth is (a) osteoblast (b) odontoblast (c) dentoblast (d) ameloblast.

Last Answer : (b) odontoblast

In preparing a very small proximal amalgam cavity on a molar tooth what would consider, A. Extend the cavity to the gingival margin B. Extend the cavity beyond the contacts areas C. Achieve at least 2mm in dentine D. Extend cavity just beyond dento enamel junction

Description : In preparing a very small proximal amalgam cavity on a molar tooth what would consider, A. Extend the cavity to the gingival margin B. Extend the cavity beyond the contacts areas C. Achieve at least 2mm in dentine D. Extend cavity just beyond dento enamel junction

Last Answer : D. Extend cavity just beyond dento enamel junction

The surface of enamel rod prisms in permanent teeth is: A. Perpendicular to the outer surface of the tooth B. Parallel to the outer surface of the tooth C. Parallel to enamel contour D. Parallel to enamel-dentine contour

Description : The surface of enamel rod prisms in permanent teeth is: A. Perpendicular to the outer surface of the tooth B. Parallel to the outer surface of the tooth C. Parallel to enamel contour D. Parallel to enamel-dentine contour

Last Answer : A. Perpendicular to the outer surface of the tooth

The effectiveness of the acid etch is dependent on which of the following factors: A. Material must be used to clean the surface of the tooth prior to etching B. The effectiveness of the itchant C. The chemical and physical nature of the tooth D. The area and surface of the enamel to be itched

Description : The effectiveness of the acid etch is dependent on which of the following factors: A. Material must be used to clean the surface of the tooth prior to etching B. The effectiveness of the itchant C. The chemical and physical nature of the tooth D. The area and surface of the enamel to be itched

Last Answer : C. The chemical and physical nature of the tooth

Calculus attaches to teeth surfaces by: A. Acquired pellicle B. Interlocking to the crystals of the tooth C. Penetrated into enamel and dentine D. Mechanical interlocking E. All of the above

Description : Calculus attaches to teeth surfaces by: A. Acquired pellicle B. Interlocking to the crystals of the tooth C. Penetrated into enamel and dentine D. Mechanical interlocking E. All of the above

Last Answer : E. All of the above

When the enamel of the tooth is exposed to preparation containing high concentrations of fluoride the major reaction is: M07 A. Sodium fluoride B. Calcium fluoride C. Stannous fluoride D. Fluoroapatite

Description : When the enamel of the tooth is exposed to preparation containing high concentrations of fluoride the major reaction is: M07 A. Sodium fluoride B. Calcium fluoride C. Stannous fluoride D. Fluoroapatite

Last Answer : D. Fluoroapatite

Of all the factors that increase the resistance of teeth to dental caries, THE MOST EFFECTIVE is,** A. The general nutrition of a child during the period of tooth formation B. The intake of fluoride during the period of enamel mineralization and maturation C. Periodic topical fluoride application by dental health care following tooth eruption D. Sufficient intake of calcium and Vitamin D during the period of enamel mineralization and maturation

Description : Of all the factors that increase the resistance of teeth to dental caries, THE MOST EFFECTIVE is,** A. The general nutrition of a child during the period of tooth formation B. The ... eruption D. Sufficient intake of calcium and Vitamin D during the period of enamel mineralization and maturation

Last Answer : B. The intake of fluoride during the period of enamel mineralization and maturation

Which of the following anomalies occurs during the initiation and proliferation stages of tooth development A. Amelogenesis imperfecta (developmental defect) B. Dentinogenesis imperfecta (developmental defect) C. Enamel hypoplasia (AI type) D. Oligodontia E. Ankylosis

Description : Which of the following anomalies occurs during the initiation and proliferation stages of tooth development A. Amelogenesis imperfecta (developmental defect) B. Dentinogenesis imperfecta (developmental defect) C. Enamel hypoplasia (AI type) D. Oligodontia E. Ankylosis

Last Answer : D. Oligodontia

Nutrition to the tooth is supplied through (a) Alveolus (b) Pulp cavity (c) Enamel (d) Ail

Description : Nutrition to the tooth is supplied through (a) Alveolus (b) Pulp cavity (c) Enamel (d) Ail

Last Answer : (b) Pulp cavity

Main part of tooth is (a) Enamel (b) Dentine (c) Pulp (d) None

Description : Main part of tooth is (a) Enamel (b) Dentine (c) Pulp (d) None

Last Answer : (b) Dentine

Hardest part of tooth is (a) Dentine (b) Enamel (c) Pulp (d) None

Description : Hardest part of tooth is (a) Dentine (b) Enamel (c) Pulp (d) None

Last Answer : (b) Enamel

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?

Description : 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?

Last Answer : answer:Would this happen in Canada? Anyway, my (absolutely non-expert) opinion is that a month will not make a difference.

If you have a tooth pulled with a gold crown on it, should they give you the crown?

Description : If you have a tooth pulled with a gold crown on it, should they give you the crown?

Last Answer : answer:I always ask for the gold from dental work. There is ever any issue. But no dentist in my memory (past or future) has offered it. Of course, ask someone for it.

Is it worth getting a crown on my dead tooth?

Description : Is it worth getting a crown on my dead tooth?

Last Answer : It will look fine if you have a good crown. I have a couple and they look normal. I would do it. You may want to consider having your teeth whitened before they make the crown as it will be easier to match the color of whitened teeth.

How much will it cost to put a crown on an eye tooth that has a temporary crown?

Description : How much will it cost to put a crown on an eye tooth that has a temporary crown?

Last Answer : The price of a permanent crown will depend on its composition as well as the number of dental visits required. Since you already are halfway through the process with a temporary crown, you can choose ... rarely completely covers. Prices run from around $600 on up, starting with the low-end styles.

In the construction of a full veneer gold crown, future recession of gingival tissue can be prevented or at least minimised by, A. Extension of the crown 1 mm under the gingival crevice B. Reproduction of normal tooth incline in the gingival one third of the crown C. Slight over contouring of the tooth in the gingival one fifth of the crown D. Slight under contouring of the tooth in the gingival one fifth of the crown

Description : In the construction of a full veneer gold crown, future recession of gingival tissue can be prevented or at least minimised by, A. Extension of the crown 1 mm under the gingival crevice B. ... of the crown D. Slight under contouring of the tooth in the gingival one fifth of the crown

Last Answer : B. Reproduction of normal tooth incline in the gingival one third of the crown

The ideal length of core in the fabrication of crown and core of endodontically treated tooth is, A. 1.5 of crown length B. The length of the crown C. 2/3 tooth/root length D. ½ root length

Description : The ideal length of core in the fabrication of crown and core of endodontically treated tooth is, A. 1.5 of crown length B. The length of the crown C. 2/3 tooth/root length D. ½ root length

Last Answer : C. 2/3 tooth/root length

A vital tooth has a crown cemented to a pin-retained amalgam core; where does a failure occur: A. Between crown and cement B. Between core and cement C. In the crown and the root D. In the core and the margin preparation

Description : A vital tooth has a crown cemented to a pin-retained amalgam core; where does a failure occur: A. Between crown and cement B. Between core and cement C. In the crown and the root D. In the core and the margin preparation

Last Answer : B. Between core and cement

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

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

Last Answer : A. 2:3

A cast crown fits on the die but not on the tooth, the discrepancy is about 0.3mm, what would you do: A. Relieve cast from the inside B. Take a new impression and make new crown C. Burnish margins D. Use thick mix of cement

Description : A cast crown fits on the die but not on the tooth, the discrepancy is about 0.3mm, what would you do: A. Relieve cast from the inside B. Take a new impression and make new crown C. Burnish margins D. Use thick mix of cement

Last Answer : B. Take a new impression and make new crown

The cervical finish line of a full veneer crown preparation should be placed: A. Just supragingival whenever is possible B. According to the depth of gingival crevice C. Subgingival to reduce ability of recurrent caries D. At the junction of tooth and amalgam core

Description : The cervical finish line of a full veneer crown preparation should be placed: A. Just supragingival whenever is possible B. According to the depth of gingival crevice C. Subgingival to reduce ability of recurrent caries D. At the junction of tooth and amalgam core

Last Answer : A. Just supragingival whenever is possible

In regard to apically displaced flap, what is TRUE: A. Does not preserve attached gingivae B. Does not lengthen crown of tooth C. Is a pocket elimination procedure D. A & C

Description : In regard to apically displaced flap, what is TRUE: A. Does not preserve attached gingivae B. Does not lengthen crown of tooth C. Is a pocket elimination procedure D. A & C

Last Answer : C. Is a pocket elimination procedure

What is the ideal length for a post in post-core in an endodontically treated tooth: A. 2/3 of the tooth length B. ½ of the tooth length C. 1.5 times that of the crown D. Same as the anticipated crown

Description : What is the ideal length for a post in post-core in an endodontically treated tooth: A. 2/3 of the tooth length B. ½ of the tooth length C. 1.5 times that of the crown D. Same as the anticipated crown

Last Answer : A. 2/3 of the tooth length

A labially displaced anterior tooth is restored with a gold core porcelain jacket crown so that it is in line with the arch; the crown will appears: A. Short B. Long C. Narrow D. Wide

Description : A labially displaced anterior tooth is restored with a gold core porcelain jacket crown so that it is in line with the arch; the crown will appears: A. Short B. Long C. Narrow D. Wide

Last Answer : C. Narrow

In bridge work, which of the followings terms is NOT CORRECT: A. A retainer could be a crown to which a bridge is attached to B. A connector connects a pontic to a retainer or two retainers to each other C. The saddle is the area of the edentulous ridge over which the pontic will lie and comes in contact with pontic D. A pontic is an artificial tooth as part of a bridge

Description : In bridge work, which of the followings terms is NOT CORRECT: A. A retainer could be a crown to which a bridge is attached to B. A connector connects a pontic to a retainer or two retainers to each ... lie and comes in contact with pontic D. A pontic is an artificial tooth as part of a bridge

Last Answer : C. The saddle is the area of the edentulous ridge over which the pontic will lie and comes in contact with pontic

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

While you finish a class I cavity, the enamel is sound but you notice a brown line in the dentine and on the Dento-enamel junction, what is your response, A. You leave it and complete the final restoration B. You extend your preparation and clean it C. You apply a cover of varnish

Description : While you finish a class I cavity, the enamel is sound but you notice a brown line in the dentine and on the Dento-enamel junction, what is your response, A. You leave it and complete the final restoration B. You extend your preparation and clean it C. You apply a cover of varnish

Last Answer : B. You extend your preparation and clean it

What kind of material is dentin ?

Description : What kind of material is dentin ?

Last Answer : Dentin is a hard material.

What is Dentin ?

Description : What is Dentin ?

Last Answer : The layer inside the tooth that covers most of the space around the tooth is called dentin.

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

Description : 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

Last Answer : c. 2.0 mm

In 3rd generation dentin bonding agents, HEMA (Hydroxyethylmethacrylate) is 1. a hydrophilic monomer that wets the dentinal surface 2. a hydrophilic resin that forms a ”hybrid” layer by chemically reacting the intertubular dentin. 3. a hydrophilic monomer that alters collagen to promote cross linking of collagen to dentin. 4. a bifunctional molecule resin that copolymerizes to bis-GMA resins. a. 1,2 b. 1,4 c. 2,3 d. 1,3 e. 3,4

Description : In 3rd generation dentin bonding agents, HEMA (Hydroxyethylmethacrylate) is 1. a hydrophilic monomer that wets the dentinal surface 2. a hydrophilic resin that forms a hybrid layer by chemically reacting the intertubular dentin. 3. a hydrophilic ... a. 1,2 b. 1,4 c. 2,3 d. 1,3 e. 3,4

Last Answer : b. 1,4

With dentin bonding agent, you apply: A. First acid etching to dentine and then bonding agent B. Bonding agent directly to dentine C. Chelating agent (EDTA) and bonding agent

Description : With dentin bonding agent, you apply: A. First acid etching to dentine and then bonding agent B. Bonding agent directly to dentine C. Chelating agent (EDTA) and bonding agent

Last Answer : A. First acid etching to dentine and then bonding agent