1. DISORDERS OF MAXILLA AND MANDIBLE(CYSTS AND TUMOURS) DR.SHAHZADI TAYYABA HASHMI shshzadi@inaya.edu.sa

2. PERIAPICAL CYST: An Odontogenic cyst derived from rests of MALASSEZ that proliferate in response to inflammation Rests of MALASSEZ are the remnants of HERTWIG’S EPETHELIAL root sheath that persist in the periodontal ligament after root formation is complete PERIAPICAL CYST: An Odontogenic cyst derived from rests of MALASSEZ that proliferate in response to inflammation Rests of MALASSEZ are the remnants of HERTWIG’S EPETHELIAL root sheath that persist in the periodontal ligament after root formation is complete INFLAMMATORY ODONTOGENIC CYST

3.  Develops at the apex of root adjacent to pulp canal opening  Measures less than 1cm in diameter RADIOGRAPHIC FEATURES: Appears as \ rounded, well-circumscribed radiolucency at the apex of a non-vital tooth  Develops at the apex of root adjacent to pulp canal opening  Measures less than 1cm in diameter RADIOGRAPHIC FEATURES: Appears as \ rounded, well-circumscribed radiolucency at the apex of a non-vital tooth CLINICAL FEATURES

4. Cysts are usually inflamed and neutrophils are present within the epithelial lining TREATMENT: Surgical enucleation after extraction If Periapical cyst is not removed, residual cyst may develop A cyst that remains at the site of previously extracted tooth Is termed as Residual cyst Cysts are usually inflamed and neutrophils are present within the epithelial lining TREATMENT: Surgical enucleation after extraction If Periapical cyst is not removed, residual cyst may develop A cyst that remains at the site of previously extracted tooth Is termed as Residual cyst HISTOPATHOLOGY AND TREATMENT

5. NASOPALATINE DUCT CYSTSNASOLABIAL CYST NON-ODONTOGENIC CYSTS

6. CLINICAL FEATURES:  Occasionally they cause intermittent discharge with a salty taste  May cause swelling in the midline of the anterior part of the palate near the incisive foramen RADIOGRAPHIC FEATURES: Oval or heart shaped radiolucency located in the midline of anterior maxilla between the roots of central incisors TREATMENT: Surgical enucleation using a palatal approach CLINICAL FEATURES:  Occasionally they cause intermittent discharge with a salty taste  May cause swelling in the midline of the anterior part of the palate near the incisive foramen RADIOGRAPHIC FEATURES: Oval or heart shaped radiolucency located in the midline of anterior maxilla between the roots of central incisors TREATMENT: Surgical enucleation using a palatal approach NASOPALATINE DUCT CYST(INCISIVE CANAL CYST)

7. A developmental cyst of the soft tissues of the anterior mucobuccal fold beneath the ala of the nose Also known as Nasoalveolar Cyst CLINICAL FEATURES: Unilateral or bilateral painless soft tissue swelling Common in females TREATMENT:  Surgical ENUCLEATION A developmental cyst of the soft tissues of the anterior mucobuccal fold beneath the ala of the nose Also known as Nasoalveolar Cyst CLINICAL FEATURES: Unilateral or bilateral painless soft tissue swelling Common in females TREATMENT:  Surgical ENUCLEATION NASOLABIAL CYST

9. BENIGN EPITHELIAL NEOPLASMS: 1.AMELOBLASTOMA and its variants 2.SQUAMOUS ODONTOGENIC TUMOUR (SOT) 3.CALCIFYING ODONTOGENIC TUMOUR (COT) 4.ADENOMATOID ODONTOGENIC TUMOUR (AOT) 5.CALCIFYING ODONTOGENIC CYST BENIGN MIXED EPITHELIAL AND CONNECTIVE TISSUE NEOPLASMS: AMELOBLASTIC FIBROMA BENIGN EPITHELIAL NEOPLASMS: 1.AMELOBLASTOMA and its variants 2.SQUAMOUS ODONTOGENIC TUMOUR (SOT) 3.CALCIFYING ODONTOGENIC TUMOUR (COT) 4.ADENOMATOID ODONTOGENIC TUMOUR (AOT) 5.CALCIFYING ODONTOGENIC CYST BENIGN MIXED EPITHELIAL AND CONNECTIVE TISSUE NEOPLASMS: AMELOBLASTIC FIBROMA IMPORTANT TYPES OF ODONTOGENIC TUMOURS

10. BENIGN CONNECTIVE TISSUE NEOPLASMS ODONTOGENIC FIBROMA ODONTOGENIC MYXOMA CEMENTOBLASTOMA MALIGNANT EPITHELIAL NEOPLASMS ODONTOGENIC CARCINOMAS CLEAR CELL ODONTOGENIC CARCINOMA MALIGNANT CONNECTIVE TISSUE NEOPLASMS ODONTOGENIC SARCOMAS BENIGN CONNECTIVE TISSUE NEOPLASMS ODONTOGENIC FIBROMA ODONTOGENIC MYXOMA CEMENTOBLASTOMA MALIGNANT EPITHELIAL NEOPLASMS ODONTOGENIC CARCINOMAS CLEAR CELL ODONTOGENIC CARCINOMA MALIGNANT CONNECTIVE TISSUE NEOPLASMS ODONTOGENIC SARCOMAS IMPORTANT TYPES OF ODONTOGENIC TUMOURS