Dentosphere : World of Dentistry

Composite is a compound of two or more different constituents with properties that are superior to those of the individual constituent. COMPOSITION: a) Resin Matrix The matrix consists of Bis-phenol Glycidylmethacrylate (Bis-GMA) and Triethylene Glycol Dimethacrylate (TEGDMA). TEGDMA is used as a viscosity controller. b) Fillers - silica Addition of fillers increases the strength, hardness, abrasion resistance and decreases the polymerization shrinkage and water sorption. c) Coupling agent Organosilane, zirconates or titanates. They bond the filler particles to the resin matrix. d) Inhibitor - Hydroquinone Prevents premature polymerization e) Opacifiers and coloring agents Titanium dioxide and aluminum oxide are the opacifiers. The coupling agent between filler particle and the resin is VINYL SILANE. TYPES: CHEMICALLY ACTIVATED COMPOSITES: # Supplied in two pastes Basic Paste - Contains the initiator benzoyl peroxide Accelerator Paste - Contains tertiary am...

- Glass Ionomer Cement is also known as Polyalkenoate cement / Man-made dentin / Dentin Substitute / Aluminosilicate Polyacrylic cement (ASPA) COMPOSITION : Powder / Liquid Contents Powder / Ion Leachable Glass Silica           -          35 - 50 % Alumina      -           20 - 30 % NaF             -           3 - 6 % AlF3            -           1.5 - 2.5 % Aluminium Phosphate  -    4 - 12 % Traces of Barium, Strontium for radioopacity Liquid Polyacrylic acid        -        45 % Itaconic acid + Maleic Acid + Tricarballylic acid    - 5 % (Decreases Viscosity) Tartaric acid (Increases working time) Water   - 50 % CLASSIFICATION: Type I GIC - Luting cement Ty...

Hairy Leukoplakia is the second most common HIV-associated oral mucosal lesions after Candidiasis. It is non malignant and is not pathognomic for HIV since other immunodeficiencies such as cancer chemotherapy are also associated with hairy leukoplakia. The common site for this condition is on the lateral borders of tongue in form of vertical white folds. Diagnosis of Hairy Leukoplakia Features Provisional Diagnosis Characteristic gross appearance with or without non responsiveness to antifungal therapy Presumptive Diagnosis Light microscopy of histologic sections revealing hyperkeratosis, koilocytosis, acanthosis, and absence of inflammatory cell infiltrate OR Light microscopy of cytologic operations demonstrating nuclear beading and chromatin margination Definitive Diagnosis Insitu Hybridisation of histologic or cytologic specimen revealing positive staining for EBV DNA OR Electron microscopy of histologic or cytologic specimen showing herpes-like partic...

Multiple Endocrine Neoplasia (MEN) Syndrome MEN - I Hyperplasia of  pituitary gland with acromegaly Hyperplasia of parathyroid and adrenal cortex Hyperplasia of pancreatic islets with increased production of gastrin, insulin, and glucagon with peptic ulcers and gastric hypersecretion MEN - II (Sipple's Syndrome) Hyperplasia of parathyroid gland No tumors of pancreas. No peptic ulcer. Patients may have pheochromocytomas of the adrenal medulla and medullary carcinoma of the thyroid gland MEN - III Pheochromocytomas and Medullary carcinoma of the thyroid gland Oral neuromas that are common on lips, tongue and buccal mucosa. The lips are described as Bumpy lips. Multiple Endocrine Neoplasia or MEN Syndrome are classified  into following types : A. MEN - I Hyperplasia of  pituitary gland with acromegaly Hyperplasia of parathyroid and adrenal cortex Hyperplasia of pancreatic islets with increased production of gastrin, ...

  Click HERE to view all our MCQ Topics. # All of the following statements about the typical features of a periapical granuloma are TRUE except : A. It consists of proliferating granulation tissue B. It can form only if the periapical bone is resorbed C. It shows evidence of local antibody production D. It results from immunologically mediated tissue damage # Phlegmon is a : A. Sexually transmitted disease B. Type of cellulitis C. Type of osteomyelitis D. Endocrine Disease # Most common cyst in oral region is : A. Medial cyst B. Radicular cyst C. Follicular cyst D. Nasolabial cyst # Dental cyst: A. Occurs from reduced enamel epithelium B. replaces the tooth to which it is attached C. is frequently seen with a missing tooth on the X ray D. Cystic lining of stratified squamous epithelium # The earliest response of pulpitis is : A. Cyst formation B. Calcification C. Hyalinization D. F...

# Internal carotid artery at the bifurcation from the common carotid is : A. Lateral to the external carotid B. Medial to external carotid C. Posterior to external carotid D. Anterior to external carotid # Foramen transversarium transmit : A. Internal jugular vein B. Inferior petrosal sinus C. Sigmoid sinus D. Vertebral artery # The cavernous sinus communicates directly with all except : A. Inferior petrosal sinus B. Pterygoid venous plexus C. Veins in orbit D. Sigmoid sinus and straight sinus # Middle thyroid vein drains into : A. External jugular vein B. Anterior jugular vein C. Internal jugular vein D. Brachiocephalic vein # Ophthalmic artery is the branch of __________ part of internal carotid artery . A. Intra cavernous B. Intra petrous C. Intra cerebral D. Extra cranial # Artery palpable at the anterior border of masseter is : A. Maxillar...

# The number of branches of the internal carotid artery in the neck is : A. One B. Two C. Four D. None # Lymph from the teeth drains into all of the following nodes except : A. Sub mandibular nodes B. Deep cervical nodes C. Retropharyngeal nodes D. Sub mental nodes # Facial artery does not supply the : A. Tonsils B. Submandibular gland C. External auditory meatus D. Lower part of the nasal septum # The external jugular vein : A. Lies deep to the Sternocleidomastoid muscle B. It drains into internal jugular vein C. It is formed by the union of the posterior auricular vein and posterior division of the retromandibular vein D. It pierces pre-tracheal layer of cervical fascia before termination # Danger area of face is called so because of connection of facial veins to cavernous sinus through : A. Transverse facial vein B. Superior ophthalmic vein C. Maxillary vein D. Ethmoidal vein # Origin of maxillary artery : A. Angle of man...