This document classifies and provides epidemiological information about cysts of the jaws. It divides cysts into true cysts that are epithelial lined and pseudocysts that are non-epithelial lined. True cysts are further divided into developmental cysts, which include odontogenic cysts arising from odontogenic rests and non-odontogenic cysts, and inflammatory cysts. It provides details on the classification, origin, and epidemiology of various odontogenic and non-odontogenic cysts such as dentigerous, nasopalatine, keratocysts, lateral periodontal, and radicular cysts. Radicular cysts comprise the majority of cysts according to some epidemiological

1. Cysts of the JawsClassification / epidemiology

2. WHO – modified
• True cysts “epithelial lined cysts”
1-developmental
A-odontogenic
B-nonodontogenic
2-inflammatory cysts
• Pseudocysts “non epithelial lined cysts”

3. Based on origin
• Odontoginic rests
1-Cysts of rest of malasses
2-Reduced of enamel epithelium
3-Rests of Dental lameina
• Non odontogenic rests
1-Remnant of nasopalatine duct

4. Developmental
1-odontogenic cysts
• Gingival cyst of infant
• Odontogenic keratocyst
• Dentigerous cyst
• Eruption cyst
• Lateral periodontal cyst
• Gingival cyst of adult
• Glandular odontogenic cyst
• Calcifying odontogenic cyst

5. Developmental
2-non odontogenic cyst
• Nasopalatine cyst
• Nasolabial cyst
• Globulomaxillary cyst
• Median mandibular cyst

6. 3-Inflamatory cysts
• Radicular: residual / lateral
• Paradental “Paradental buccal bifurcation cyst”

7. Pseudocysts
“non epithelial lined cysts”
• Aneurismal bone cyst
• Traumatic bone cyst
• Static bone cyst “Stafne’s bone defect”
• Focal osteoporotic bone marrow defect
“hematopoietic”

8. Based on origin
odontogenic cysts
• Cysts of rest of malasses
1- radicular 2-risedual
• Remnant of enamel epithelium
1-dentigerous cyst 2-eruption cyst
• Dental lamina
1-keratocyst
2-lateral periodontal cyst
3-glandular odontogenic cyst

9. Based on origin
non odontogenic cysts
Remnant of nasopalatine duct
1-nasopalatine canal cyst

10. Epidemiology
Radicular = any age, peak in 3rd-6th decade
Dentigerous = young adult / 2nd-4th decade
Nasopalatine = any age
Keratocyst = any age, especially adults
Lateral periodontal cyst = adults
Paradental cyst = adults

11. Epidemiology
Cawson 2002
Radicular =65-70%
Dentigerouse =15-18%
Nasopalatine =5-10%
Keratocyst =3-5%
Lateral periodontal cyst = %1>
Paradental cyst %1>=

12. Epidemiology
SHEAR 2006
Radicular =52.30%
Dentigerouse =18.10%
Nasopalatine =5-10%
Rasidual =8%
Keratocyst =11.60%
Lateral periodontal cyst = %1>
Paradental cyst =5.60%