Classification of Composites and their Properties

Type	Properties
Conventional Composite	Contain filler particle size of 8-12 micrometers It is the composite with largest filler size High strength and hardness Less water soprtion and Coefficient of thermal expansion Polishing is difficult and results in rough surface that tends to retain stains
Micro filled Composite	Contain smallest filler particles of size 0.04 - 0.4 micrometers Colloidal silica is used as a filler It has lowest filler content of 50% weight Lowest strength and hardness Highest thermal expansion coefficient and water sorption Excellent esthetics due to the increased smoothness
Small Particle	Contain filler particles of size 1 - 5 micrometers It has good surface smoothness like microfilled composites and improved physical properties like conventional composite It has the highest compressive strength of all composites
Hybrid Composite	It has filler particle size of 0.6 - 1 micrometer They have smooth finish and better esthetics than small particle but yet have similar physical properties.

Different Types of Pain : Anesthesia. Hyperaesthesia, Paraesthesia, Allodynia, etc.

TAXONOMY OF PAIN

Terminology	Description
Anesthesia dolorosa	It is a paradoxic pain in the region of sensory loss following an injury to a cranial nerve or a nerve root. It is seen most often after surgical treatment of the trigeminal ganglion or root for neuralgia.
Allodynia	Pain due to non painful stimulus that does not normally produce pain.
Hyperalgesia	Increased response to a stimulus that is usually painful
Hyperaesthesia	Increased sensitivity to stimulation and does not imply a painful sensation. Hyperalgesia is a special case of hyperaesthesia.
Hypoaesthesia	Decreased sensitivity to stimulation
Hypoalgesia	A special case of hypoaesthesia in which pain response to normally painful stimuli is diminished.
Paraesthesia	Abnormal (but not unpleasant) sensation
Dysesthesia	Unpleasant abnormal sensation
Hyperpathia	It is painful syndrome with increased reaction to a stimulus and an increased threshold; faulty identification and localization of stimulus; delayed and radiating sensations and after sensation may be present.
Causalgia	It is a syndrome of: Burning Pain, Allodynia, and Hyperpathia after a traumatic nerve lesion.
Phantom pain	Described as perceptions that an individual experiences relating to a limb or an organ that is not physically part of the body. For example, Limb loss as a result of either amputation following surgery or congenital absence of limb. Phantom limb pain is the feeling of pain in an absent limb or a portion of a limb.

Polishing Agents in Dentistry

Agent	Uses
Pumice	Smoothening dentures, polishing of artificial teeth
Zinc Oxide	Polishing of amalgam restorations
Rouge (Tin oxide)	Polishing of noble metal alloys
Zirconium Silicate	Prophylactic paste for polishing natural teeth
Chromic Oxide	Polishing Stainless steel
Corundum (White form of Al2O3)	Grinding of metal alloys

Most Common Sites of Some Important Pathologies : Oral Cancer, Cysts, Tumors etc.

Condition	Most Common Site
Enameloma	Bifurcation and trifurcation of maxillary posterior teeth
Composite compound odontoma Adenomatoid odontogenic tumor Squamous odontogenic tumor	Anterior maxilla
Composite Complex Odontoma	Posterior maxilla