Diagnosis of cracked tooth syndrome

 # Diagnosis of cracked tooth syndrome is made by:

A. Biting on solid object and release of pressure

B. Only during bites

C. Percussion

D. All of the above

The correct answer is A. Biting on solid object and release of pressure

The bite test is useful in identifying a cracked tooth or fractured cusp when pressure is applied in a certain direction to one cusp or section of the tooth. It is also helpful in diagnosing cases wherein the pulpal pathosis has extended into the periradicular region causing apical periodontitis. The Tooth Slooth  and the Frac Finder are the popular commercially available devices for the bite test.

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Pain on tooth preparation even on the enamel layer

 # Some patients experience pain on tooth preparation even on the enamel layer. This may be due to:

A. Enamel Tufts

B. Enamel lamellae

C. Enamel spindles

D. Striae of Retzius

The correct answer is C. Enamel Spindles.

Odontoblastic processes occasionally cross the DEJ into enamel; these are termed enamel spindles when their ends are thickened. They may serve as pain receptors, explaining the enamel sensitivity experienced by some patients during tooth preparation.

Ref: Sturdevant’s Art and Science of Operative Dentistry, 7e, André V. Ritter, Lee W. Boushell, Ricardo Walter, Second South Asia Edition, 2019

Page No: 8

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The largest portion of a tooth is formed by:

 # The largest portion of a tooth is formed by:

A. Enamel

B. Dentin

C. Pulp

D. Cementum

The correct answer is B. Dentin.

Dentin forms the largest portion of the tooth structure, extending almost the full length of the tooth. Externally, dentin is covered by enamel on the anatomic crown and cementum on the anatomic root. Internally, dentin forms the walls of the pulp cavity (pulp chamber and pulp canals).

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Number of enamel rods in a maxillary molar is about:

 # Number of enamel rods in a maxillary molar is about:

A. 8 million

B. 12 million

C. 20 million

D. 30  million

The correct answer is B. 12 million.

The rods vary in number from approximately 5 million for a mandibular incisor to about 12 million for a maxillary molar. The rods are densely packed and intertwined in a wavy course, and each extends from the dentinoenamel junction (DEJ) to the external surface of the tooth.

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