The document describes the stages of tooth development from the bud stage through eruption. It discusses the epithelial and mesenchymal tissues involved including the dental lamina, dental papilla, stellate reticulum, enamel organ. It also describes the formation of dentin, enamel, and cementum, as well as root development and maturation of the periodontal ligament. Finally, it briefly discusses tooth eruption through resorption of bone by osteoclasts.

2. Bud stage

3. Cap stage

4. Stellate reticulum

5. Outer dental epithelium

6. Inner dental epithelium

7. Dental papilla

8. Dental sac

9. Enamel cord

10. Early bell stage

11. Early bell stage

12. Early Bell stage

13. Dental papilla

14. Lateral dental lamina

15. Cervical loop

16. Stellate reticulium

17. Dental papilla

18. Primordium of permanent tooth

19. Dental sac

20. Advanced Bell StageAdvanced Bell Stage

21. Stratum intermedium

22. Ameloblasts

23. Predentin

24. Outer dental epithelium

25. Stratum intermedium

26. Dental papilla

27. Advanced Bell Stage

28. Stratum intermedium

29. Enamel matrix

30. Dentin

31. Predentin

32. Odontoblasts

33. Enamel matrix

34. Ameloblast

35. Stratum intermedium

36. Enamel matrix

37. Dentin

38. Outer enamel epithelium

39. Reduced enamel epithelium

40. Dentine

41. Developing
pulp

42. Enamel matrix

43. Enamel matrix

44. Predentin

45. Odontoblast

46. Epithelial Diaphragm

47. Epithelial Diaphragm

48. Ameloblasts

49. Cervical loop

50. Epithelial diaphragm

51. Predentin
Dentin

52. Predentin

53. Predentin
Globular mineralization of
dentin

54. Odontoblasts

55. Odontoblasts

56. Enamel spindle

57. Enamel lamella

58. Hunter-Schreger BandsHunter-Schreger Bands

59. Incremental lines of Retzius

60. DEJ

61. Dentinal tubules

62. Incremental Lines of Retzius

63. Enamel tuft

64. Pulp in situ

65. Dentin

66. Cementum

67. Periodontal ligamet

68. Enamel lamella

69. Enamel spindle

70. Dentinal tubule

71. Neonatal line

72. Interglobular dentin space

73. Interglobular dentin
space

74. Dentino-enamel junction

76. Incremental lines of von Ebner

77. Secondary dentin

78. Sclerotic dentin

79. Dead tract

80. Reparative dentin

82. Secondary dentin

83. Tomes’ granular layer

84. Dentinal tubules

85. Cellular
cementum
Acellular
cementum

90. Acellular cementum
Tomes’ granular layer

91. Acellular
cementum

92. Cellular cementum

93. Cellular Cementum

94. Lacuna of cementocyte

95. Lacunae &canaliculi of cementocytes

96. Incremental lines of Salter

97. L.S ground section showing:ATLAS
• A- cementum overlaps enamel 60%
• B- cementum meets enamel 30%
• C- no junction(gap junction) 10%

98. Attached cementicle

99. Hypercementosis

100. D
Pre D
Odontoblasts
Cell Free Zone
Cell Rich Zone
Core

102. Diffuse pulp calcification

104. True denticle

105. Pulp stone

108. Osteoblast

109. Osteoclasts

111. Howships lacuna

112. ERM

113. ERM

114. ERM

115. The remnants of the
epithelial root sheath of
Hertwig migrate toward
the dental sac and
become the epithelial
rests of Malassez found
in the periodontal
ligament of the fully
developed tooth.
The remnants of the
epithelial root sheath of
Hertwig migrate toward
the dental sac and
become the epithelial
rests of Malassez found
in the periodontal
ligament of the fully
developed tooth.
A-
Epitheli
al rests
A-
Epitheli
al rests

116. Epithelial rests of Malassez

117. Oblique fibers Malassez’ restAlveolar bone
Dentin

118. Alveolar crest group

119. Horizontal fibers

120. Gingival ligament

121. Alveolar crest (group) fibers

122. Alveolar process

123. Bundle bone

124. Acellular cementum

125. Interstitial tissue space

126. Transeptal Fibers

127. Oblique fibers

128. Interradicular fibers

129. Horizontal fibers

130. Apical fibers

131. Oblique fibers

132. Horizontal fibers

134. Alveolar process

135. Alveolar process

138. Bundle bone

139. Bundle bone

140. Bundle bone

141. Bundle bone

142. Interstitial tissue space
Bundle bone

143. Compact bone

144. Haversian system

145. Haversian canal Haversian system

146. Haversian canal

147. Volkman’s canal

148. Interstitial lamellae

149. Bone lamella Lacuna of osteocyte

150. Haversian canal Osteocyte

151. Compact bone

152. Osteocyte osteoblast

153. Spongy bone

156. Fiboblasts

157. Stratified Squamous Keratinized
Epithelium

158. Stratified Squamous Keratinized Epithelium
Keratin layer

159. Stratified Squamous Keratinized Epithelium

160. Stratified squamous non keratinized epithelium

161. Gingiva

162. Gingiva

163. Gingiva

164. Gingiva

167. Vermilion
border
Lining mucosa
Skin side

168. Skin side of the lip
Sebaceous
gland
Hair
follicle
Stratum cornium

169. Vermilion border

170. Vermilion border

172. Masticatory mucosa of the hard palate

173. Hard palate

174. Mucous acini

176. Lining mucosa
of lip
Labial gland
Orbicularis oris
muscle

177. Lining mucosa of cheek
Buccal
gland

178. Soft palate

179. Lining mucosa

180. Lining mucosa

182. Labial
mucosa
OralFree
Gingival sulcus
Sulcular
Enamel
space
Attachment
epithelium

183. Free gingiva
Gingival sulcus&
enamel space
Free gingival
groove

184. Junctional epithelium

185. Cementum
Junctioal epithelium on cementum

186. Junctional epithelium on cementum

188. Attached epithelium

189. Attached
epithelium
Epithelial
diaphragm

190. Interdental septum

192. Filiform papillae

193. Filliform papilla

194. Filiform papilla

195. Fungiform papilla

196. Fungiform papilla Taste buds

197. Filiform papillaFungiform papilla

198. Fungiform papilla
Tate bud

199. Fungiform
papilla

200. Fungiform papilla

201. Circumvallate papilla

202. Circumvallate papilla

203. Circumvallate papilla

204. Foliate papilla

205. Taste bud

206. Taste bud

207. Taste bud

208. Taste bud

209. Taste pore

210. Taste bud

211. Taste buds

212. von Ebner S. G.

214. Serous
acini
Serous salivary gland
Intercalated
duct

215. Intercalated
ducts
Zymogen
granules
Serous salivary gland

216. Mixed salivary gland
Mucous
acinus
Serous
acinus

217. Mucous
acinus
Serous
acinus
Zymogen
granules
Mixed salivary gland

218. Mucous
acinus
Serous
acinus
Mixed salivary gland

219. Mixed salivary gland
Serous demilune
of vonEbner

220. Serous salivary gland

221. Buccal salivary gland (mixed(
Mucous acini
Serous acini

222. Striated muscle fibers
Serous
acinus
Mucous
acinus

223. Mixed salivary gland predominantly serous
(submandibular gland(

224. Intercalated duct Serous acinus
Mucous cells
Mixed salivary gland

225. Mucous terminal
portion
Intercalated
duct
Serous acinus
Striated
duct
Mixed salivary gland

226. Intercalated
duct
Striated
ducts
Mixed salivary gland (major sublingual(
Serous
acinus
Mixed terminal
portion

227. Serous
demilunes
Serous
acinus
Mixed acinus
Mixed salivary gland

228. Intercalated
duct
Adipose
tissue
Serous gland
Striated
duct

229. Mucous acinus
Intercalated
duct
Mixed salivary gland ( Submandibular(

230. Large inter-lobar
excretory duct
C.T. stroma
Mixed salivary gland

231. Excretory
duct
Goblet cell

232. Striated
duct
Serous salivary gland

233. Striated
ducts
Mucous acini
Serous acini
Mixed salivary gland

234. Striated
ducts
Interalated
duct
Mixed salivary gland

235. Mucous acinus
Intercalated
duct
Striated
duct
Mixed salivary gland(submandibular gland(

236. Striated
duct
Mixed salivary gland

237. Parotid gland Adipose tissue

238. Excretory duct
Parotid gland

239. Excretory duct

240. Intercalated
duct
Serous acinus Demilunes of
von Ebner

241. Serous
acinus
Mucous acinus
Mixed salivary gland

242. Striated duct
Mucous
acinus
Demilune of
von Ebner

243. Demilune of von EbnerMixed salivary gland

244. Excretory duct
Serous acinus

245. Demilune of von EbnerMixed salivary gland

248. Tooth germ of deciduous predeccessor

249. Tooth germ of permanent successor

252. Tooth
germ of
permanent
successor

253. Erupting
permanent
successor
Shedding of
predecessor

256. Decalcified H & E stained section showing
shedding of deciduous tooth

263. During the intraosseous phase, the rate averages 1-
10 um per day, it increases to about 75 um per day
once the tooth escapes from its bony cell.

264. Tooth
eruption
Key: 1 = milk teeth; 2 = developing adult teeth; 3 = jaw bone; 4 = gum1mm
1 1
2
2 2
3
3
3
4
4

265. Tooth eruption

266. Osteoclasts erode jaw bone to make way for erupting adult tooth

268. Eruption

269. Reduced enamel epithelium

270. Erupting
deciduous
tooth

271. Meckel’s cartilage

272. Meckel’s cartilage

273. Nasal septum
Palatine process

275. Psuedo-stratified ciliated epitheliumPsuedo-stratified ciliated epithelium

276. Lining of maxillary sinus

278. Lining of maxillary sinus

279. Lining of maxillary sinus

280. Lining of maxillary sinus
Goblet cell

286. Articular eminence

287. Articular disc

288. Condyler head

289. Articular disc
(meniscus(
Condylar head
Glenoid fossa

290. ORAL BIOLOGYORAL BIOLOGY
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