what is defined as the amount by which a tooth space exceeds the thickness of an engaging tooth
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- What is backlash in gear terms? The term backlash is defined as the amount by which a tooth space exceeds the thickness of a gear tooth engaged in mesh. It is necessary to ensure the smooth rotation of meshed gears. The following extract is from the KHK Gear Catalogue* which details the types of backlashes, the relationships between backlashes and the fundamental equations, as well as easy-to-understand illustrations of how it all works.
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overbite ver·ti·cal o·ver·lap. 1  1. the extension of the upper teeth over the lower teeth in a vertical direction when the opposing posterior teeth are in contact in centric occlusion;
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Glossary â Common Dental & Periodontal Terms Mobility of teeth: The degree of looseness of a tooth. Mucogingival: A generic term used to describe the mucogingival junction and its relationships to the attached gingiva, alveolar mucosa, frenula, muscle attachments and the buccal and labial vestibule. Mucosa: The tissue lining the oral cavity. (Return to Top)
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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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- Leeway Space. Leeway space is the size differential between the primary posterior teeth (canine, first and second molars labeled C, D and E in the picture), and the permanent canine and first and second premolar (labeled 3, 4 and 5). Usually the sum of the primary tooth widths is greater than that of their permanent successors.
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teeth Any of the hard, bony conical structures of the upper and lower jaws used for chewing. A tooth consists of a crown portion above the gum, a root portion embedded in a socket (alveolus) of the jaw bone, and a neck or cervical constricted region between the crown and root. The soft-tissue gingiva covers the neck and root to a variable extent, depending on age and oral hygiene.
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Thickness, Parallelism and Flatness. How do they relate? Thickness, Parallelism and Flatness Definitions. Plate thickness: the distance between two surfaces of a part (commonly the top and bottom) with a deviation tolerance specified (ex. 2.307” +/-0.0010”). This distance is most commonly measured by using precision micrometers.
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Diastema (Gap Between Teeth) A diastema is a space or gap between two 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. If the teeth are too small for the jaw bone, spaces between the teeth will occur.
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Loose Teeth Healthy Tooth: A healthy periodontal attachment of a tooth to bone and gum tissue receives normal biting forces with no apparent looseness. Primary Occlusal (Bite) Trauma: Excessive forces from clenching and grinding habits can cause stretching and widening of the periodontal tissues that result in tooth looseness.
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Overjet & Overbite in adult teeth | Problems, causes & treatments Increased overjet can cause an increased susceptibility to dental trauma. With an overjet of over 4mm, patients are estimated to have double the risk of incisor trauma, which can in turn lead to premature loss of the teeth.
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wear n a loss of tooth substance in contact areas through functional wear and friction, resulting in broadening and flattening of the contacts and a decrease in the mesiodistal dimension of the teeth and the dentition as a whole. wear, occlusal, n attritional loss of substance on opposing occlusal units or surfaces.
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Gingival sulcus The gingival sulcus is an area of potential space between a tooth and the surrounding gingival tissue and is lined by sulcular epithelium. The depth of the sulcus (Latin for groove) is bounded by two entities: apically by the gingival fibers of the connective tissue attachment and coronally by the free gingival margin.
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plaque plaque, tooth-surface-attached, n a type of subgingival plaque that uses selective attachment factors and is located in the subgingival area. This type of plaque is implicated in the formation of caries of the root and eventual breakdown of the root (resorption).
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Gear Tooth Fillet Profile Optimization The gear tooth fillet is an area of maximum bending stress concentration. However, its profile and accuracy are marginally defined on the gear drawing by typically very generous root diameter tolerance and, in some cases, by the minimum fillet radius, which is difficult to inspect.
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- 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 mating gear.
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- Overjet vs Overbite. These two orthodontic terms are used to describe incisor relationship and are often confused by both patients, parents and sometimes general dental practitioners. Overjet is the measurement (usually in millimetres) between the upper incisal edge and the labial surface of the lower incisors. The normal value is considered to be approximately 2-3 mm but this is increased in Class 2 Division 1 malocclusions and reduced in Class 3 malocclusions.
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Obstetrician Salary Obstetrician Salary. The national mean obstetrician salary is reported to be $217,000 per year according to data from the Bureau of Labor Statistics. The hourly median is $104.30 per hour.There are many factors that affect how much an obstetrician earns. Factors such as place of work, type of establishment, geographical location, years of experience on the job, education and size of establishment can all determine an obstetrician’s salary.bstetricians employed in outpatient care centers are paid on average $215,000 per year. Obstetricians who find themselves working in colleges, professional schools and universities can expect to earn a mean salary of about $115,000 per year.
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What is the backlash in gears? How is it advantageous or disadvantageous? Backlash is defined as the amount by which width of tooth space exceeds the tooth thickness of engaged gear when measured on pitch circle. Now, it is clear that when this happens there is some gap left between the teeth engaged.
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How To Make One-Bowl Microwave Macaroni and Cheese Instructions. 1  Combine the pasta, water, and salt in a microwave-safe bowl. 2  Microwave the pasta for 2 minutes: Microwave on high power for 2 minutes, then stir. 3  Continue microwaving in 2-minute intervals until the pasta is cooked.  Stir the milk and cheese into the pasta.
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- Loss of tooth characteristics. Dental attrition is a type of tooth wear caused by tooth-to-tooth contact, resulting in loss of tooth tissue, usually starting at the incisal or occlusal surfaces. Tooth wear is a physiological process and is commonly seen as a normal part of aging.
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DA deciduous teeth Leeway space. arch circumference difference between primary canine and 1st and 2nd primary molars, and permanent canine and premolars. occurs in both arches-bigger in mandible(3.6mm) vs maxilla(1.5mm) may change because permanent anteriors are bigger, but premolars that replace molars are smaller-causing shift.
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Differences between Fenestration and Dehiscence Make a note that Marginal Bone is intact in Fenestration. Definition of Tooth Dehiscence: Dehiscence are isolated areas in which root is denuded of bone and root surface is covered by periosteum and overlying gingiva but the denuded are extends through the Marginal Bone.
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Reversible Pulpitis Pulpitis is a general term for inflammation of the tooth pulp, which consists of the blood vessels, nerve tissue, and living cells that occupy the hollow interior of teeth (Figure 1). Pulpitis is characterized by tooth sensitivity that arises from excess blood flow (hyperemia) to the tooth.
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- Tooth Abfraction : What is it, what causes it and what is the preferred treatment to correct this before it causes tooth loss? What Is Tooth Abfraction? Take a look at your teeth. If you see notches at the point where the crown of your tooth meets the gum tissue, well, that is typically called a tooth abfraction.
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Dental Terms Enamel: The hard, calcified (mineralized) portion of the tooth which covers the crown. Enamel is the hardest substance in the body. Endodontics: The dental specialty that deals with injuries to or diseases of the pulp, or nerve, of the tooth. Extraction: The removal of a tooth.
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Tooth Surfaces The distal surface is the side of the tooth that is farthest away from the arch middle (midline). Interproximal Area. The interproximal area is formed by the proximal contact of adjacent teeth. The area above the proximal contact, towards the gingiva, is the interproximal space.