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61. If the pulp of a single rooted tooth canal were triangular in cross section with the base of the triangle located facially and the apex lingually with a longer mesial side than distal side; the tooth most likely is_____________?

A. Maxillary central incisor
B. Maxillary second premolar
C. Mandibular lateral incisor
D. Mandibular central incisor

62. The permanent mandibular second molar differs from the permanent mandibular first molar in number of ______________?

A. Cusps
B. Roots
C. Lingual grooves
D. Marginal ridges

63. Fourth canal is present in_____________?

A. Mesiobuccal roots of maxillary first molar
B. Distal root of mandibular first molar
C. Both of the above
D. None of the above

64. The geometric outline of the buccal surface of posterior teeth are_______________?

A. Trapezoidal
B. Rhomboidal
C. Quadrilateral
D. Square

65. The lingual cusp of lower first premolar is compared to the development of____________?

A. Cusp of carabelli
B. Distolingual cusp of molars
C. Lingual cusp of second premolar
D. Cingulam of canine

66. The maxillary molar crown of an early fossil primate featured a trigone made of three main cusps, these cusps were_____________?

A. Distrobuccal, distolingual and Mesiolingual
B. Distolingual, Mesiobuccal, and Linguo buccal
C. Mesiobuccal, Distobuccal and Mesiolingual
D. Mesiolingual, Mesiobuccal and distolingual

67. Which line angle area is most acute when a permanent maxillary second molar is viewed occlusally ?

A. Mesiofacial
B. Distofacial
C. Mesiolingual
D. Distolingual

68. What is the functional form of anterior teeth from the mesial or the distal aspect ?

A. Rhomboidal
B. Trapezoidal
C. Elliptical
D. Wedge- shaped

69. The shape of the occlusal surface of the permanent maxillary first molar is___________?

A. Oval
B. Trapezoidal
C. Triangular
D. Rhomboidal

70. The number of line angles a permanent maxillary central incisor is_____________?

A. Two
B. Four
C. Six
D. Eight