_____ is defined as the amount by which a tooth space exceeds the thickness of an engaging tooth
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- BACKLASH (B) is the amount by which the width of a tooth space exceeds the thickness of the engaging tooth on the pitch circles. As actually indicated by measuring devices, backlash may be determined variously in the transverse, normal, or axial-planes, and either in the direction of the pitch circles or on the line of action.
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- Medical Definition of Cavities. Cavities: Holes or structural damage in the two outer layers of a tooth called the enamel and the dentin. The enamel is the outermost white hard surface and the dentin is the yellow layer just beneath enamel. Both layers serve to protect the inner living tooth tissue called the pulp, where blood vessels and nerves reside. Cavities are caused by bacteria in the mouth.
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tooth [to̳th] (pl. teeth) one of the small bonelike structures of the jaws for biting and mastication of food; they also help in the shaping of sounds and forming of words in speech. Structure. The portion of a tooth that rises above the gum is the crown; the portion below is the root. The crown is covered by enamel, which is related to the epithelial tissue of the skin and is the hardest substance in the human body. The surface of the root is composed of a bonelike tissue called cementum.
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Space Between Front Teeth After a minor surgical procedure (frenectomy) relocates the frenum away from the teeth preventing the space from reopening. Dear Keith, You have what is called a large frenum (pronounced “free – num”, or frenulum (fren-u-lum). This is a fold of tissue that connects the gum to the lip and sometimes contains muscle tissue.
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- Adjustment Selective grinding of teeth or restorations to alter shape or contour and establish stable occlusion. Angle A corner. x Cavosurface angle: An angle formed between the cavity wall and surface of the tooth. x Line angle: The angle formed between two cavity walls or tooth surfaces.
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A Guide to Dental Terms A Guide to Dental Terms. Abrasion - Loss of tooth structure caused by a hard toothbrush, poor brushing teeth technique or bruxism (grinding or clenching the teeth). Abscess - An infection of a tooth, soft tissue or bone. Abutment - tooth or teeth that support a fixed or removable tooth bridge. Adhesive Dentistry - Contemporary term for dental restorations that involve bonding of composite resin or porcelain fillings to natural teeth. Air Abrasion - Removal of tooth structure by blasting a tooth with air and abrasive, a relatively new technology that may avoid the need for anesthetic.
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- Tooth impaction. An impacted tooth is one that fails to erupt into the dental arch within the expected developmental window. Because impacted teeth do not erupt, they are retained throughout the individual's lifetime unless extracted or exposed surgically.
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- 4. A space between the upper central incisors in humans, or a space between two adjacent teeth in the same dental arch, especially that between the upper lateral incisor and the adjacent canine, into which the lower canine closes in the Carnivora, such as dogs. Synonym(s): space (2) . [G. diastēma, an interval]. , pl.
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Tooth impaction Teeth may become impacted because of adjacent teeth, dense overlying bone, excessive soft tissue or a genetic abnormality. Most often, the cause of impaction is inadequate arch length and space in which to erupt.
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Thread: Gear Tooth Pressure angle A 20 degree pressure angle allows for a smaller gear with less teeth before they begin to undercut making the base thinner than the pitch circle thickness of the tooth.
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- 2013 2 Apr. A dental ABFRACTION is a notched-out area on the root of a tooth at the gumline. There are several causes for this. It can be caused by toothbrush wear over a period of time…usually by vigorous brushing in certain areas or by the use of a hard-bristled toothbrush.
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- The depth of the gingival floor must be a MINIMUM of 1 mm as measured from the cavo surface (at the gingival floor level) to the axial wall. Half a millimeter of the MINIMUM 1 mm axial wall depth must be placed into dentin.
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floss floss cleft, n a narrow gap created in the gingival tissues between the teeth by floss that is repeatedly positioned incorrectly so that it presses against the gingiva. floss cuts, prevention of, n the patient care information centered around the protection of injury to the gingival tissues, particularly the col. Instruction includes careful attention to the angle and thickness of floss used, as well as proper flossing technique.
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Orthodontic Disorders Cameron Park CA Breaking oral habits such as digit sucking will facilitate the correction of an open bite and make the result more stable. Overbite. Overbite is a measure of the vertical overlap of the upper and lower front teeth. Excessive overbite may be caused by disproportionate eruption of front teeth or over development of the bone that supports the teeth. Overbite is also known as a deep bite.
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Dental avulsion (Redirected from Tooth avulsion) Dental avulsion is the complete displacement of a tooth from its socket in alveolar bone owing to trauma. The treatment for permanent teeth consists of replantation, immediately if possible. Deciduous teeth should not be replanted due to the risk of damaging the permanent tooth germ.
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Medical Dictionary Note: Abfraction is postulated to occur when the force generated by occlusion (as during chewing) causes stress to concentrate on certain points of a tooth. This stress results in tooth flexure and leads to the eventual breaking away of hard tissue.
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8/4/2016 The tooth thickness is generally measured at pitch. circle and is, therefore, referred to as pitch­line thickness of tooth. The gear tooth vernier has two vernier. scales and they are set for the width (w) of the tooth and the depth (d) from the top, at which w occurs.
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food impaction The forcing of food into the interproximal spaces of teeth by chewing (vertical impaction) or by tongue and cheek pressure (horizontal impaction).he forcing of food into the interproximal spaces of teeth by chewing (vertical impaction) or by tongue and cheek pressure (horizontal impaction).
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Diastema (Gap Between Teeth) It appears most often between the two upper front teeth. However, gaps can occur between any two teeth. A mismatch between the size of the jaw bones and the size of the teeth can cause either extra space between teeth or crowding of teeth.
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Tooth mobility Normal, physiologic tooth mobility of about 0.25 mm is present in health. This is because the tooth is not fused to the bones of the jaws, but is connected to the sockets by the periodontal ligament. This slight mobility is to accommodate forces on the teeth during chewing without damaging them.: 55 Milk (deciduous) teeth also become looser naturally just before their exfoliation.
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Gear CIRCULAR PITCH (p) is the distance along the pitch circle or. pitch line between corresponding profiles of adjacent teeth. CIRCULAR THICKNESS (t) is the length of arc between the. two sides of a gear tooth on the pitch circle, unless otherwise. specified. CLEARANCE-OPERATING (c) is the amount by which the. dedendum in a given gear exceeds the addendum of its mat-. ing gear.
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Glossary of dentistry The direction towards the biting surface of posterior teeth or something relating to this surface, such as the terms occlusal interference or occlusal surface. This is the sister term to incisal, which related to the analogous location on anterior teeth.
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scaling noun, Dentistry. 1. the removal of calculus and other deposits on the teeth by means of instruments.
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- Extrusion. An injury to the tooth characterized by partial or total separation of the periodontal ligament resulting in loosening and displacement of the tooth. The alveolar socket bone is intact in an extrusion injury as opposed to a lateral luxation injury.In addition to axial displacement, the tooth will usually have an element of protrusion or retrusion. In severe extrusion injuries the retrusion/protrusion element can be very pronounced.he alveolar socket bone is intact in an extrusion injury as opposed to a lateral luxation injury. In addition to axial displacement, the tooth will usually have an element of protrusion or retrusion. In severe extrusion injuries the retrusion/protrusion element can be very pronounced.
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Deep Cleaning Your Teeth: When to Do It The depth of the gum tissue between the teeth and gums are called pockets when it is five millimeters or more. The American Academy of Periodontology recommends that every adult receive a periodontal evaluation each year to determine whether additional treatment is needed.
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What is Orthodontics? Misplaced midline— when the center of your upper front teeth does not line up with the center of your lower front teeth. Spacing — gaps, or spaces, between the teeth as a result of missing teeth or teeth that do not fill up the mouth. Crowding — when there are too many teeth for the dental ridge to accommodate.