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20/20

Subject: Music

This US group was formed in Los Angeles, California, in 1978 by Steve Allen (guitar, vocals) and Ron Flynt (bass, vocals), two expatriate musicians from Tulsa, Oklahoma. Drummer Mike Gallo ...

lymphatic system

lymphatic system   Quick reference

A Dictionary of Dentistry (2 ed.)

Reference type:
Subject Reference
Current Version:
2020
Subject:
Medicine and health, Dentistry
Length:
139 words
Illustration(s):
1

...from the anterior part of the mouth and face and drain secondarily to the superior deep jugular nodes. All of these lymphatics eventually drain into the venous system. Lymph drainage and nodes of the head and neck https://gmch.gov.in/e-study/e%20lectures/Anatomy/The%20Lymphatics%20of%20the%20Head,%20Face,.pdf A slide presentation providing an outline of lymphatic drainage of the head and...

supernumerary tooth

supernumerary tooth   Quick reference

A Dictionary of Dentistry (2 ed.)

Reference type:
Subject Reference
Current Version:
2020
Subject:
Medicine and health, Dentistry
Length:
193 words
Illustration(s):
1

...supernumerary tooth Any tooth additional to the normal 32 teeth in the permanent dentition or the 20 teeth in the primary dentition . They are rare in the primary dentition but common in the permanent dentition, particularly in the anterior and premolar regions of the maxilla ; they tend to occur more frequently in females than males. They may be described according to their location, e.g. distomolar , mesiodens , paramolar , parapremolar . The aetiology of supernumerary teeth is not completely understood. Multiple supernumerary teeth may be...

ultrasound

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A Dictionary of Dentistry (2 ed.)

Reference type:
Subject Reference
Current Version:
2020
Subject:
Medicine and health, Dentistry
Length:
127 words
Illustration(s):
1

...ultrasound ( ultrasonography ) n. A technique using ultra-high frequency sound waves (1–20KHz) to visualize soft tissues. Sound waves are produced by mechanical vibrations using a piezoelectric transducer to convert electrical signals into sound waves, which are transmitted through the tissues as a series of pulses. It is becoming increasingly used for diagnostic purposes in the head and neck region in which shorter wave lengths (7–12MHz) are utilized; it is often the first imaging modality of choice for soft tissue lesions including lymph nodes and ...

tooth notation

tooth notation   Quick reference

A Dictionary of Dentistry (2 ed.)

Reference type:
Subject Reference
Current Version:
2020
Subject:
Medicine and health, Dentistry
Length:
605 words
Illustration(s):
1

...using upper-case letters (an alternative system labels them 1d to 20d). The designations ‘left’ and ‘right’ on the chart correspond to the patient’s left and right, respectively; however, the orientation of the chart is traditionally ‘patient’s view’, i.e. patient’s right corresponds to notation-chart right. The universal/national tooth numbering system Permanent Teeth upper left upper right 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 lower...

primary (deciduous) dentition

primary (deciduous) dentition   Quick reference

A Dictionary of Dentistry (2 ed.)

Reference type:
Subject Reference
Current Version:
2020
Subject:
Medicine and health, Dentistry
Length:
180 words
Illustration(s):
1

...primary (deciduous) dentition The first set of teeth which erupt into the mouth. Each mouth quadrant has 5 teeth—2 incisors anteriorly, 1 canine distal to the 2 incisors and 2 molars distal to the canine—to make a total dentition of 20 teeth. The incisors erupt at 6–9 months of age, followed by the first molars at 12–14 months, the canines at 16–18 months, and finally the second molars at 24–30 months. There can be considerable variation in eruption dates, although eruption of the central incisors after the lateral incisors usually indicates some pathology....

basic periodontal examination

basic periodontal examination   Quick reference

A Dictionary of Dentistry (2 ed.)

Reference type:
Subject Reference
Current Version:
2020
Subject:
Medicine and health, Dentistry
Length:
300 words
Illustration(s):
2

...and recording ( PSR ) ) A periodontal screening system which identifies patients who require a more detailed periodontal examination. It is carried out using a World Health Organization or Community Periodontal Index of Treatment Needs (CPITN) probe using a probing force of 20–25gm. The CPITN-E probe has one dark band 2mm in width located 3.5–5.5mm from the probe tip; the CPITN-C probe has an additional 3mm dark band located 8.5–11.5mm from the probe tip. Basic periodontal examination: CPITN probes BPE codes Code Signs Management Code 0 ...

probe

probe   Quick reference

A Dictionary of Dentistry (2 ed.)

Reference type:
Subject Reference
Current Version:
2020
Subject:
Medicine and health, Dentistry
Length:
402 words
Illustration(s):
1

...been developed to give more consistent, accurate, and reliable recordings; this probe consists of a tip connected to a special spring mechanism, which controls the pressure extended to the probe tip. According to the manufacturer, the force indicator lines coincide at approximately 20gm force. The Florida periodontal probe is an automated probe with a computerized device which combines a constant measured probing force with accurate periodontal pocket depth measurement. The Williams periodontal probe , developed by C. H. M. Williams in 1936 , is a round,...

caries

caries   Quick reference

A Dictionary of Dentistry (2 ed.)

Reference type:
Subject Reference
Current Version:
2020
Subject:
Medicine and health, Dentistry
Length:
1,038 words
Illustration(s):
5

...extended period of time there is a marked loss of mineral below the tooth surface, resulting in the appearance of a white spot lesion on the enamel. Microscopically, enamel caries starts as a wedge shape with the point towards the dentine and an intact outer layer of enamel about 20–50µm thick. The lesion is reversible at this stage. Enamel caries tends to occur in areas of stagnation where the plaque is not readily removed, such as in tooth pits and fissures, interproximal areas, or around poorly contoured restorations. If the acidic condition persists, the...

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