Three Case Studies in OcclusionIn this post, I'll review three cultures with different degrees of malocclusion over time, and try to explain how the factors I've discussed may have played a role.The Xavante of Simoes LopesIn 1966, Dr. Jerry D. Niswander published a paper titled "The Oral Status of the Xavantes of Simoes Lopes", describing the dental health and occlusion of 166 Brazilian hunter-gatherers from the Xavante tribe (free full text). This tribe was living predominantly according to tradition, although they had begun trading with the...
Sabtu, 28 November 2009
Selasa, 24 November 2009
Malocclusion: Disease of Civilization, Part VII
Jaw Development During AdolescenceBeginning at about age 11, the skull undergoes a growth spurt. This corresponds roughly with the growth spurt in the rest of the body, with the precise timing depending on gender and other factors. Growth continues until about age 17, when the last skull sutures cease growing and slowly fuse. One of these sutures runs along the center of the maxillary arch (the arch in the upper jaw), and contributes to the widening...
Selasa, 17 November 2009
Malocclusion: Disease of Civilization, Part VI
Early Postnatal Face and Jaw DevelopmentThe face and jaws change more from birth to age four than at any other period of development after birth. At birth, infants have no teeth and their skull bones have not yet fused, allowing rapid growth. This period has a strong influence on the development of the jaws and face. The majority of malocclusions are established by the end this stage of development. Birth is the point at which the infant begins...
Selasa, 10 November 2009
Malocclusion: Disease of Civilization, Part V
Prenatal Development of the Face and JawsThe structures of the face and jaws take shape during the first trimester of pregnancy. The 5th to 11th weeks of pregnancy are particularly crucial for occlusion, because this is when the jaws, nasal septum and other cranial structures form. The nasal septum is the piece of cartilage that forms the structure of the nose and separates the two air passages as they enter the nostrils. Maternal Nutritional Status Affects Fetal Development Abnormal nutrient status can lead to several types of birth defects....
Jumat, 06 November 2009
Omega-3 Eggs
Eggs are an exceptionally nutritious food, as are all foods destined to nourish a growing animal. However, one concern lies in eggs' high concentration of arachidonic acid (AA), a long-chain omega-6 fat that is the precursor to many eicosanoids. Omega-6 derived eicosanoids are essential molecules that are involved in healing, development and defense. Some of them are inflammatory mediators that can contribute to disease when present in excess. Eggs are one of the main sources of AA in the modern diet.The percent long-chain omega-6 fats (including...
Selasa, 03 November 2009
Impressions of Hawai'i
I recently went to Hawai'i for the American Society of Human Genetics meeting in Waikiki, followed by a one-week vacation on Kaua'i with friends. It was my first time in Hawai'i and I really enjoyed it. The Hawai'ians I encountered were kind and generous people.Early European explorers remarked on the beauty, strength, good nature and exellent physical development of the native Hawai'ians. The traditional Hawai'ian diet consisted mostly of taro root,...
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