Possible OSPE Oral Bio 1 copy.pdf for dental

Oral Biology OSPE Description

The Objective Structured Practical Examination (OSPE) in oral biology is a structured method of practical assessment designed to evaluate a student’s knowledge, understanding, and applied skills in the subject of oral biology. Unlike traditional practical exams, which often rely on long experiments or subjective viva questions, OSPE is systematic, objective, and competency-based.

In an OSPE, the examination is conducted in the form of stations. Each station is carefully designed to test a specific aspect of oral biology—ranging from identification, applied knowledge, or interpretation of findings. Students rotate through these stations, spending a fixed amount of time at each. Some stations may involve recognizing histological slides of oral tissues, such as enamel, dentin, pulp, or salivary glands. Others may present diagrams, photographs, or models related to tooth development, eruption, or oral structures. Certain stations may be interactive, requiring the student to answer structured questions or perform small tasks like labeling or sequencing developmental stages.

The OSPE format ensures fairness and reliability because each student is exposed to the same set of tasks and is graded using standardized checklists or answer keys. This reduces examiner bias and increases objectivity. Moreover, OSPE assesses not only factual recall but also higher-order thinking skills such as observation, correlation, and application of oral biology concepts in clinical contexts.

For dental students, OSPE in oral biology is particularly valuable as it bridges basic science and clinical dentistry. Understanding the structure, function, and development of oral tissues is crucial for interpreting pathology, planning treatment, and applying preventive strategies later in clinical practice.

In summary, the oral biology OSPE is an effective, structured, and student-centered method of assessment that emphasizes objectivity, consistency, and practical understanding of core concepts essential to dentistry
Typical oral biology OSPE stations may include:

Identification of histological slides of enamel, dentin, cementum, pulp, gingiva, or salivary glands.

Recognition of tooth development stages (bud, cap, bell).

Labeling diagrams of oral mucosa, tongue papillae, or developing jaws.

Short applied questions linking oral histology to clinical scenarios, such as the importance of dentin-pulp complex or salivary gland function.
This structured approach reduces examiner bias by using standardized checklists or marking schemes, ensuring consistency across all students. It also tests a broader range of competencies in a shorter time, improving validity of assessment. Importantly, OSPE emphasizes not only memorization but also application of knowledge, observation skills, and interpretation—qualities essential for transitioning into clinical dentistry.

For dental students, oral biology OSPE serves as a crucial bridge between basic sciences an

1. OSPE
Oral Biology

2. CHAPTER 1

3. Station

4. Tooth and supporting tissues

5. 1.Identifythe slide
(1 mark)
2. Label the slide
(0.5 mark each)
A
B
C
D
Station
(3 marks)

6. KEY –ground section of tooth and cementum

7. 1. Identify the slide
(1 mark)
2. Label the slide
(0.40 mark each)
A
B
D
C
E
Station
(3 marks)

8. Key –eruption of permanent tooth

9. Station

10. Parts of a tooth

11. Station

12. Structure of enamel

13. Station

14. Dentin-pulp complex

15. Station

16. Epithelium connective tissue interface

17. Station

18. Epithelium and underlying connective
tissue

19. Station

20. Temporomandibularjoint

21. Station

22. Section through interdentalspace
between two adjacent teeth

23. Station

24. Tooth and its supporting tissues

25. Station

26. Odontoblastslining the dentin with
odontoblasticprocesses within tubules

27. Station
A
C
B

28. Lobe of salivary gland

29. 1. Identify the slide
(1 mark)
2. Label the slide
(1mark )
B
A
C
D
E
Station

30. KEY –Salivary glands duct system (1 mark)
identification points ( 0.4 mark each)

31. Station
A
B
C
D

32. Tooth and its supporting tissues

33. Station

34. Structure of collagen fiber

35. CHAPTER 2

36. Station

37. •Dentinogenesisimperfecta

38. Station

39. Moruladifferentiated into blastocyst

40. Station

41. Moruladifferentiated into blastocyst

42. Station

43. blastocyst

44. Station

45. Blastocystat 13 days

46. Station

47. Conversion of bilaminarembryo into
trilaminarembryo

48. Station

49. Conversion of bilaminarembryo into
trilaminarembryo

50. Station

51. Conversion of bilaminarembryo into
trilaminarembryo –notochord
forming

52. Station
A
B

53. Neural ford elevation

54. Station

55. Embryo at 21 days before folding.

56. Station

57. Sagittalsection through embryo at 21
days before folding

58. Station

59. Sagittalsection Embryo at 24 days
folding has begun

60. Station

61. Sagittalsection embryo at day 26.
formation of stomodeum

62. Station

63. Mesoderm formation between
ectoderm and endoderm

64. Station

65. Differentiation of mesoderm into three
masses

66. Station

67. Differentiation of mesoderm into three
masses

68. Station

69. Differentiation of mesoderm into three
masses

70. Station

71. Differentiation of mesoderm into three
masses

72. CHAPTER 3

73. Station

74. Major components of primitive
vertebral cranial skeleton

75. Station

76. Major components of human fetal
head

77. Station

78. Sagittalsection through a 4 week
embryo

79. Station
A
B
C
D

80. Embryo at 26 days side view

81. Station
A
B
C
D

82. Embryo at 26 days front view

83. Station

84. Embryo at 35 days-development of
pharayngealarches and clefts

85. Station

86. Sagittalsection through embryo

87. Station

88. Sagittalsection through embryo

89. 1. Identify the slide
(1 mark)
2. Label the slide
(0.33 mark each)
F
A
E
D
B
C
Station
(3 marks)

90. Key –Human embryo at 34 days of development (1 mark)
Identification points (0.33 mark each)

91. Station
(3 marks)
A
C
B
E
D
F

92. Embryo at 27 days front view

93. 1. Identify the slide
(1 mark)
2. Label the slide
(0.5 mark each)
Station
(3 marks)
C
B
D
A

94. KEY
1. Formation of secondary palate (1 mark)
2. Identification (0.5 mark each)

95. Station

96. Beginning of formation of palate.
Palatine shelves lateral to tongue

97. Station

98. arrow pointing at Enamel pearl

99. Station

100. Development of mandible

101. Station
A
B
C
D
E

102. Embryo at 6 weeks of development

103. Station
A
B
C

104. Formation of secondary palate.
Palatine shelves at 7 weeks

105. Station
A
B
C

106. Formation of secondary palate.
Palatine shelves at 8 weeks

107. 1. Identify the slide (1 mark)
2. Label the slide (0.50 mark each)
A
C
B
D
Station (3 marks)

108. Key –formation of secondary palate –7 weeks (1 mark)
identification points (0.25 marks each)

109. 1. Identify the slide
(1 mark)
2. Label the slide
(0.66 mark each)
B
C
A
Station (3 marks)

110. Key –formation of secondary palate 9 weeks( 1 mark)
identification points 0.66 marks each

111. •Draw and label facial development of human
embryo at 6 weeks
Station
(6 marks)

113. Station

114. Development of oral cavity

115. Station

116. Development of oral cavity –
formation of nasal pit and primary
palate

117. Station

118. Development of oral cavity-continuity
between nasal and oral cavity
established

119. Station

120. Development of oral and nasal cavities

121. Station

122. Development of pharyngeal arches
and their derivatives –2
nd
month iu

123. Station

124. Development of pharyngeal arches
and their derivatives –2
nd
month IU

125. Station

126. Development of pharyngeal arches
and their derivatives 2
nd
month IU

127. Station

128. Development of oral and nasal cavities

129. Station

130. Development of mandible-extent of
meckel’scartilage

131. Station
A
B
C
D

132. Site of initial osteogenesisrelated to
mandible formation in close proximity
to meckelscartilage

133. Station
A
B
C
E
D

134. Intramembranousbone formation of
mandible lateral to meckel’scartilage

135. A
C
B
D
Station

136. Spread of mandible formation away
from meckel’scartilage at lingula

137. Station
A
B
C
D

138. Sagittalsection through developing
lower jaw. Tooth bud and developing
mandible visible

139. Station
A
B
C
D

140. Coronal section through developing
maxilla showing tooth germ

141. CHAPTER 4

142. Station

143. Junction complex

144. Station

145. The three components of the basal
lamina of an epithelial cell
LL –lamina lucida
LD –lamina densa
LF –lamina fibroreticularis
EC –Epithelial cell

146. Station

147. Molecular structure of a tight junction

148. Station

149. Molecular structure of an adhering
junction

150. Station

151. Molecular structure of a desmosome

152. Station

153. Molecular structure of
hemidesmosome

154. Station

155. Hemidesmosomalattachment of a cell
of salivary gland with the basal lamina

156. Station

157. Structure of a gap junction

158. Station

159. Structure of a connexonof a gap
junction

160. CHAPTER 5

161. Station

162. thickened primary epithelial band

163. A
D
E
C
B
Station

164. Developing Tongue
Primary Epithelial
band
Maxillary Process
Mandibularprocess
Sagittalsection through the head of an embryo showing
thickened primary epithelial band
ectomesenchyme

165. Station

166. Sagittalsection through the head of an embryo
showing thickened primary epithelial band

167. Station
A B

168. Division of the primary epithelial band
into two lamina

169. Station
A
B
C
D
E

170. The tooth germ and beginning of
formation of enamel and dentin

171. Station

172. The tooth germ in developing bone

173. Station
C
A
B
D
E

174. Formation of tooth bud from dental
lamina

175. Station
A
B
C
D

176. Bud stage of tooth development

177. Station
B
C
D
A

178. Bud stage of tooth development

179. Station
A
CC
BB

180. Bud stage of tooth development

181. Station
A
C
B
D
E

182. Developing tooth germ at late bell
stage of tooth development in the
mandible

183. Station

184. Coronal section through upper and lower jaws
showing tooth germs in different developmental
stages

185. Station

186. Early cap stage of tooth development

187. Station

188. Early cap stage of tooth development

189. Station

190. Late cap stage of tooth development

191. Station

192. Late cap stage of tooth development

193. Station

194. Late cap stage of tooth development
showing enamel knot

195. Station
A
C
B
D

196. Early cap stage of tooth development

197. Early cap stage of tooth development
Outer enamel
epithelium
Inner enamel
epithelium

198. Station
A
B
C

199. Enamel niche

200. Station
A
B
C

201. Cap stage of tooth development

202. Station
A
C
D
E
B
F

203. Late cap stage of tooth development

204. A
BB
C
DD
1. Identify the slide
(1 mark)
2. Label the slide
(1 mark)
Station 2

205. Late cap stage of tooth development

206. Station

207. Tooth germ at early bell stage of tooth
development

208. Station 90
A
B
C
D
E

209. Cap stage of enamel organ showing
enamel knot

210. Station 6
C
D
B
A
1. Identify the slide (1 mark)
2. Label the slide (1 mark)

211. Late cap stage of tooth development
Enamel knot

212. 1. Identify the slide
(1 mark)
2. Label the slide
(0.33 mark each)
B
C
F
E
A
D
Station

213. enamel organ at early bell stage of tooth development showing
enamel cord

214. Station 3
A
C
B
D
1. Identify the slide
(1 mark)
2. Label the slide
(1 mark)

215. Early bell stage of enamel organ.
Section through the tooth germ

216. Station
A
D
B
E
C
F

217. Late Bell stage of tooth development

218. 1. Identify the slide
(1 mark)
2. Label the slide
(0.5 mark each)
Station
A
B
C
D

219. Early bell stage of tooth development

220. Early bell stage of tooth development
Stellatereticulum
Outer enamel epithelium
Inner enamel epithelium

221. Station
A
B
C

222. Tooth germ in which crown formation
is almost complete

223. Station

224. Bell stage of tooth development

225. Station

226. Station 5
B
A
C
D
E
1. Identify the slide
(1 mark)
2. Label the slide
(1 mark)

227. Four layers of enamel organ at bell
stage of tooth development

228. Station

229. Bell stage of tooth development

230. 1. Identify the slide
(1 mark)
2. Label the slide
(0.4 mark each)
A
B
C
D
E
Station

231. Key-cap stage of tooth development (1 mark)
identification point (0.4 mark each)

232. Station

233. Late bell stage of tooth development

234. Station 7
C
A
B
D
1. Identify the slide (1 mark)
2. Label the slide (1 mark)

235. Formation of root

236. Station

237. Formation of root by hertwig’s
epithelial root sheath

238. Station

239. Formation of root

240. Station

241. Formation of root

242. Station

243. Odontoblastsdifferentiation and
Formation of root dentin by hertwig’s
epithelial root sheath a

244. Station

245. Periodontal ligament showing rest cells
of Malassez

246. Station

247. Eruption of tooth

248. Station

249. Eruption of tooth

250. Station

251. Eruption of tooth

252. Station

253. Formation of dentogingivaljunction
from oral and dental epithelium

254. Station

255. Fragmentation of hertwig’sepithelial
root sheath and initial formation of
cementum

256. Station

257. Formation of root. Hertwig’sepithelial
root sheath present at leading root
edge

258. CHAPTER 6

259. 1. identify the slide (1 mark)
2. label the slide (0.66 mark each)
A
B
C
Station

260. Compact bone

261. Station
F
G
H
I
E
D
J
L
K
O
N
M
A
B
P
Q
C

262. Structure of a long bone

263. Station

264. Structure of compact lamellar bone

265. Station

266. Bone remodelling

267. Station

268. Endochondralbone formation in long
bone

269. Station

270. Endochondralbone formation in long
bone

271. Station
A
B
C

272. Station
A
B

273. Body of mandible showing outer
compact and inner spongy bone

274. Station

275. Compact bone

276. Station

277. Compact bone showing haversian
system

278. Station

279. Compact bone showing a haversian
system

280. Station

281. Compact bone

282. Station

283. Compact bone

284. Station

285. Compact bone

286. Station

287. Trabecularbone

288. Station

289. Bone formation in proximity to
developing tooth germ

290. Station

291. Intramembranousbone formation

292. Station

293. Woven bone

294. Station

295. Intracartilagenousbone formation.
Chondrocytessurrounded by
perichondrium

296. Station

297. Intracartilagenousbone formation.

298. Station

299. Intracartilagenousbone formation

300. Station

301. Intramembranousbone formation

302. Station

303. Intramembranousbone formation

304. Station

305. Intramembranousbone formation

306. CHAPTER 7

307. 1. Identify the slide
(1 mark)
2. Label the slide
(0.28 mark each)
B
A
G
F
D
C
E
Station

308. late bell stage of tooth development with beginning of enamel
and dentin formation

309. Station

310. Key hole pattern of rods and interrods
arrangement in enamel

311. Station

312. Bell stage of tooth development
showing ameloblastsand odontoblasts

313. Station

314. Late bell stage of tooth development

315. Station
D
C
A
B
E
F

316. Late bell stage of tooth development
with functional ameloblasts

317. Station
A
D
C
B
1. Identify the slide
(1 mark)
2. Label the slide
(1 mark)

318. Functional ameloblastswith enamel
matrix formation

319. Station
A
B
C

320. Key –Enamel with incremental lines

321. Station
A
B
C
D

322. •Developing tooth
showing deposition of
enamel and dentin

323. Station

324. Amelogenesisand dentinogenesis
Small columnar cells of inner
enamel epithelium
Amebloblastsare formed
Enamel formation begins
Ameloblastsdepositing enamel
matrix

325. Station

326. Enamel matrix formation by functional
ameloblasts

327. Station

328. Formation of enamel rods and
interrodsin relation with the
ameloblaststomes process

329. Station

330. Enamel rods and interrodsformation
in association with tomes process of
ameloblasts

331. Station
A
B
1. Identify the slide
(1 mark)
2. Label the slide
(1 mark)

332. Structure of enamel showing rods and
inter rod relation

333. Station

334. Late bell stage of tooth development
and beginning of enamel and dentin
formation
•Am = amebloblast
•E = enamel
•D = dentin
•PD = predentin
•OD = odontoblast
•SI = stratum
intermedium

335. Station

336. Late bell stage of tooth development
showing enamel and dentin formation
/ secretorystage of amelogenesis

337. Station

338. Secretoryphase of amelogenesis.
Ameloblastsshowing tomes process
Pcw–proximal cell web
Dcw–distal cell web

339. Station
A
B
1. Identify the slide
(1 mark)
2. Label the slide
(1 mark)

340. Histological section through a tooth
during enamel formation showing
incremenetaldeposition of enamel

341. Station

342. Maturation phase of amelogenesis
showing smooth ended ameloblasts

343. Station

344. Maturation phase of amelogenesis
showing ruffled ended ameloblasts

345. Station

346. Reduced enamel epithelium covering
the fully formed enamel surface
before eruption

347. Station

348. Fully formed mature enamel covered
by reduced enamel epithelium before
eruption

349. Station

350. Enamel showing striaeof retzius

351. Station

352. External menifestationof striaeof
retziusknown as perikymata

353. Station
B
A
C
1. Identify the slide
(1 mark)
2. Label the slide
(1 mark)

354. Hunter schraegerbands in enamel

355. Station

356. Ground section of enamel

357. Station

358. Ground section of enamel showing
enamel lamella

359. 1. Identify the slide
(1 mark)
2. Label the slide
(0.50 mark each)
B
A
C
D
Station

360. 1. Identify the slide
(1 mark)
2. Label the slide
(0.50 mark each)
B
A
Station

361. ground section of enamel and dentin (1 mark)
(0.50 mark each)

362. Station
B
C
D
A
1. Identify the slide
(1 mark)
2. Label the slide
(1 mark)

363. Ground section of tooth showing
dentinoenameljunction and enamel
tufts

364. Station

365. Dentinoenameljunction and enamel
tufts

366. Station

367. Dentinoenameljunction

368. Station

369. Dentinoenameljunction showing
enamel spindles