Teeth And Dentistry



Teeth are small whitish structures found in the jaws (or mouths) of many vertebrates that are used to tear, scrape, and chew food. Some animals, particularly carnivores, also use teeth for hunting or defense. The roots of teeth are covered by gums. Teeth are not made of bone, but rather of tissues of varying density and hardness.

Teeth are among the most distinctive (and long-lasting) features of mammal species. Paleontologists use teeth to identify fossil species and determine their relationships. The shape of the animal's teeth are related to its diet. For example, plant matter is hard to digest, so herbivores have many molars for chewing. Carnivores, on the other hand, need canines to kill and tear meat.

Mammals are diphyodont, meaning that they develop two sets of teeth. In humans, the first set (the "baby," "milk," "primary" or "deciduous" set) normally starts to appear at about six months of age, although some babies are born with one or more visible teeth, known as neonatal teeth. Normal tooth eruption at about six months is known as teething and can be painful.

Some animals develop only one set of teeth (monophyodont) while others develop many sets (polyphyodont). Sharks, for example, grow a new set of teeth every two weeks to replace worn teeth. Rodent incisors grow and wear away continually through gnawing, maintaining relatively constant length. Many rodents, such as rabbits, guinea pigs, and the sibling vole, have continuously growing molars in addition to incisors.




Dentistry

Dentistry is the known evaluation, diagnosis, prevention, and treatment of diseases, disorders and conditions of the oral cavity, maxillofacial area and the adjacent and associated structures and their impact on the human body. Dentistry is widely considered necessary for complete oral health. Those in the practice of dentistry are known as dentists. Other people aiding in oral health service include dental assistants, dental hygienists, dental technicians, and dental therapists. Dentistry is that branch of science which deals with the study and practice of diagnosis, prevention, and treatment of diseases of the mouth, the maxilla, and the face.


History

The Indus Valley Civilization has yielded evidence of dentistry being practiced as far back as 7000 BCE. This earliest form of dentistry involved curing tooth related disorders with bow drills operated, perhaps, by skilled bead craftsmen. The reconstruction of this ancient form of dentistry showed that the methods used were reliable and effective.

A Sumerian text from 5000 BC describes a "tooth worm" as the cause of dental caries.

Evidence of this belief has also been found in ancient India, Egypt, Japan, and China.

The legend of the worm is also found in the writings of Homer, and as late as the 1300s AD the surgeon Guy de Chauliac still promoted the belief that worms cause tooth decay.

The Edwin Smith Papyrus, written in the 17th century BC but which may reflect previous manuscripts from as early as 3000 BC, includes the treatment of several dental ailments.

In the 18th century BC, the Code of Hammurabi referenced dental extraction twice as it related to punishment.

Examination of the remains of some ancient Egyptians and Greco-Romans reveals early attempts at dental prosthetics and surgery.

Ancient Greek scholars Hippocrates and Aristotle wrote about dentistry, including the eruption pattern of teeth, treating decayed teeth and gum disease, extracting teeth with forceps, and using wires to stabilize loose teeth and fractured jaws.

The first use of dental appliances or bridges comes from the Etruscans from as early as 700 BC.

Roman medical writer Cornelius Celsus wrote extensively of oral diseases as well as dental treatments such as narcotic-containing emollients and astringents.

Historically, dental extractions have been used to treat a variety of illnesses. During the Middle Ages and throughout the 19th century, dentistry was not a profession in itself, and often dental procedures were performed by barbers or general physicians. Barbers usually limited their practice to extracting teeth which alleviated pain and associated chronic tooth infection. Instruments used for dental extractions date back several centuries.

In the 14th century, Guy de Chauliac invented the dental pelican (resembling a pelican's beak) which was used up until the late 18th century. The pelican was replaced by the dental key which, in turn, was replaced by modern forceps in the 20th century.

The first book focused solely on dentistry was the "Artzney Buchlein" in 1530, and the first dental textbook written in English was called "Operator for the Teeth" by Charles Allen in 1685.

It was between 1650 and 1800 that the science of modern dentistry developed. It is said that the 17th century French physician Pierre Fauchard started dentistry science as we know it today, and he has been named "the father of modern dentistry".

Among many of his developments were the extensive use of dental prosthesis, the introduction of dental fillings as a treatment for dental caries and the statement that sugar derivate acids such as tartaric acid are responsible for dental decay.


Dentistry

Teeth




In the News ...





Hundreds of years later, teeth tell the story of people who didn't get enough sunshine   PhysOrg - July 18, 2016
Researchers have found a rich new record of vitamin D deficiency, one that resides in the teeth of every person and remains viable for hundreds of years or more. The team of anthropologists has determined that looking into the microscopic structure of teeth opens a window into the lives and challenges of people who lived hundreds of years ago, and whose only record is their skeletal remains.




  Ancient Romans of Pompeii Had Surprisingly Good Dental Health   Epoch Times - October 6, 2015
Don't expect to find a dentist's office if you ever visit the ancient Roman city of Pompeii. The inhabitants most likely had no need for them. Elisa Vanacore, a dental expert and orthodontist currently studying Pompeiian bodies, said, The inhabitants of Pompeii ate a lot of fruit and vegetables but very little sugar. They ate better than we did and have really good teeth. Studying their teeth could reveal a lot more about their lives. But it likely wasn't diet alone that gave Pompeiians their good dental health.




Strong teeth: Nanostructures under stress make teeth crack resistant   PhysOrg - June 10, 2015
Engineers use internal stresses to strengthen materials for specific technical purposes. Now it seems that evolution has long 'known' about this trick, and has put it to use in our natural teeth. Unlike bones, which are made partly of living cells, human teeth are not able to repair damage. Their bulk is made of dentin, a bonelike material consisting of mineral nanoparticles. These mineral nanoparticles are embedded in collagen protein fibres, with which they are tightly connected. In every tooth, such fibers can be found, and they lie in layers, making teeth tough and damage resistant. Still, it was not well understood, how crack propagation in teeth can be stopped.




New Tooth Decay Treatment May Do Away With Fillings, Allow Teeth To Repair Themselves   Huffington Post - June 16, 2014
Dread going to the dentist? A new dental procedure out of the United Kingdom may make appointments a lot less anxiety-inducing by doing away with the drill. Researchers at King's College London are working on a device for a tooth decay treatment that would fix cavities without the need for fillings and drilling. The two-step process, called Electrically Accelerated and Enhanced Remineralisation (EAER), involves an electric current that spurs decayed teeth to repair themselves.




Lasers 'could prevent' need for root canal treatment   BBC - May 29, 2014
Lasers have been used to regenerate parts of damaged teeth and could one day be used to prevent root canal treatments, claim US researchers.The laser beam triggered a series of changes that led to the formation of new dentin, the layer below the enamel, in animal tests.




Bye Bye, Root Canals? Lasers Could Replace Dentist's Drill   Live Science - May 29, 2014
Nobody likes having to undergo a root canal, but these painful procedures could soon be a thing of the past. The trick: laser light and stem cells. Researchers at Harvard University found that exposing the cells on the inside of a tooth to weak laser light stimulates the growth of dentin, the substance that makes up much of a tooth's structure. So far, the experiments have been done in rats and mice but the researchers have tested the technique on human cells in culture, and it seems to work, said Priveen Arany, an assistant clinical investigator at the National Institutes of Health.




Researchers use light to coax stem cells to regrow teeth   PhysOrg - May 28, 2014
A Harvard-led team is the first to demonstrate the ability to use low-power light to trigger stem cells inside the body to regenerate tissue. The team used a low-power laser to trigger human dental stem cells to form dentin, the hard tissue that is similar to bone and makes up the bulk of teeth. What's more, they outlined the precise molecular mechanism involved, and demonstrated its prowess using multiple laboratory and animal models.




Tooth implant restores vision in blind man in UK   Times of India - October 4, 2013
During the technique osteo-odonto-keratoprosthsesis, one of Ian's front teeth and a part of jaw was removed and used as a lens holder in his right eye. "It was an incredible moment - I never thought I would ever be able to see my own children," said Ian.




Researchers grow teeth from gum cells   BBC - March 9, 2013
Dentists may one day be able to replace missing teeth with ones newly grown from gum cells, say UK researchers. The team from King's College London took cells from adult human gum tissue and combined them with another type of cell from mice to grow a tooth.




The real fear of dental chair revealed   PhysOrg - December 8, 2010
Nearly one in five women - and one in ten men - will suffer 'extreme dental anxiety' before they even sit in the dentist's chair, according to the biggest adult dental survey for a decade. The results of the 2009 Adult Dental Health Survey (ADHS), which includes findings from Newcastle University, also reveal that a greater percentage of younger adults experience extreme dental anxiety, than older adults. The study, which gives a snapshot of adults' teeth across England, Northern Ireland and Wales, shows that a greater percentage of adults in Wales have poor dental health compared to their counterparts in England. The ADHS, which has taken place every decade since 1968, found that: ‘Extreme dental anxiety' in the dentist's waiting room affected 19 per cent of all adult women and 10 per cent of all men. Fifteen per cent of adults aged 16 to 24 and 25 to 34 had ‘extreme dental anxiety' compared with 9 per cent of adults over 85




Tooth Decay to Be a Thing of the Past? Enzyme Responsible for Dental Plaque Sticking to Teeth Deciphered   Science Daily - December 5, 2010

The Groningen professors Bauke Dijkstra and Lubbert Dijkhuizen have deciphered the structure and functional mechanism of the glucansucrase enzyme that is responsible for dental plaque sticking to teeth. This knowledge will stimulate the identification of substances that inhibit the enzyme. Just add that substance to toothpaste, or even sweets, and caries will be a thing of the past.




Human Teeth Reveal History of Catastrophes   Live Science - February 26, 2010
Teeth are a window into our past, storing a record of the environmental pollutants and radiation they've encountered. Now scientists are developing tools to use teeth enamel to test how much radiation a person has been exposed to in the case of a major emergency, like a dirty bomb explosion. "Dental enamel is quite a remarkable material," said Barry Pass, a professor in the College of Dentistry at Howard University in Washington, D.C. "There's a world of information in the tooth." When a person is exposed to radiation, the energy can create free radicals in the body. These are atoms that have an extra unpaired electron, which makes them unstable – in healthy tissue, they can harm regular molecules by stealing electrons and damaging DNA.




Replacement teeth grown in mice   BBC - August 4, 2009
Researchers in Japan have successfully grown replacement teeth in mice, according to a report in PNAS journal. Tissue containing the cells and instructions for building a tooth was transplanted into the jawbones of mice. They report that these tissue "germs" regularly grew into fully functional teeth with a hardness comparable to that of the natural variety. The work illustrates a technique that could lead to engineered organ replacements, according to the authors.




New treatment for receding gums: No pain, lots of gain   PhysOrg - July 2, 2009
Our teeth are put to the test every day, withstanding all the crunching and munching of meals and snacks. This remarkable resilience appears to be due to the microscopic "basket-weave" structure of human tooth enamel, a new study finds. Tooth enamel, which forms the outer coating of teeth, is a strong but brittle substance. Given the brittleness of teeth, which is comparable to that of glass, it's a wonder that for the most part, they can last a lifetime without cracking to pieces.




Mystery of Tooth Strength Cracked   Live Science - April 14, 2009
Our teeth are put to the test every day, withstanding all the crunching and munching of meals and snacks. This remarkable resilience appears to be due to the microscopic "basket-weave" structure of human tooth enamel, a new study finds. Tooth enamel, which forms the outer coating of teeth, is a strong but brittle substance. Given the brittleness of teeth, which is comparable to that of glass, it's a wonder that for the most part, they can last a lifetime without cracking to pieces.




Researchers Define Molecular Basis Of Human 'Sweet Tooth'   Science Daily - November 3, 2003
The researchers said their findings open the way for tracing the circuitry for sweet and umami tastes all the way to the centers in the brain that perceive those tastes. The findings also suggest that individual variations in the "sweet tooth" response may lie in subtle genetic differences in receptor molecules that perceive sweet taste.




Scientists grow teeth in lab   BBC - December 11, 2002

Scientists have successfully used tissue engineering techniques to grow almost fully formed teeth. They believe the breakthrough could eventually lead to a biological tooth substitute to replace human teeth. The researchers made a suspension of individual cells from a young tooth reorganize into a tooth crown containing both enamel and dentin. Dr Pamela Yelick told BBC News Online that it might be possible one day to grow human teeth of a particular size and shape. She predicted that within five years, we would know whether dental stem cells could be manipulated to bioengineer teeth. To generate a human tooth might take an additional five to 10 years.




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