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     
9.17.3  Niemann- Pick Disease
Niemann- Pick disease is another rare group of progressive genetic lysosomal storage disorders. It is a consequence of abnormal accumulation of sphingomyelin secondary to sphingomyelinase defi­ciency. Similar to Gaucher disease, Niemann- Pick disease comprises three types: A, B and C, with mutation of NPC- 1 and NPC- 2 genes in an autosomal recessive manner in type C (104). These abnormally functioning enzymes owed to impaired cholesterol transport leading to accumulation in brain cells and other tissues. They present with clinically distinguishable features with develop­mental delay, visceral changes such as pulmonary disorders or failure, hepatosplenomegaly, demen­tia, psychiatric symptoms, cognitive impairment, muscle spasticity with difficulty swallowing, and an increased tendency to bleed. History, clinical examination, serum biomarkers and genetic analy­sis of the NPC- 1 and NPC- 2 genes help in early diagnosis and potential clinical intervention(105).
9.17.4  Tay- Sachs Disease
Tay- Sachs disease is characterised by the abnormal deposition of ganglioside in the neuronal lys­osomes due to the deficiency of beta- hexosaminidase. It is known for its advanced neuronal dete­rioration, seizures, blindness and developmental deficit in infancy due to genetics in an autosomal recessive manner. Genetic counselling, early diagnosis and multidisciplinary care help with the complications. There is no cure, and they have poor prognosis and may result in a fatal scenario with less than five years of life expectancy(106, 107).
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9.18   Disorders ofMicronutrients andTheir  Oro- facial Manifestations
9.18.1 Iron
Iron is one of the crucial micronutrients essential for producing haemoglobin, deoxyribonucleic acid and metabolic processes that help in growth and development(108). Iron regulation depends on the production of red blood cells (RBCs) from the bone marrow, dietary intake, transport by transferrin, storage as ferritin, absorption, physiologic amounts of excretion and recycling(109). Iron deficiency may disrupt iron metabolism because iron can form free radicals and cause tissue damage. Diseases that encompass inadequate iron or overload may range from anaemia to hemo­chromatosis, resulting in possible neurodegenerative disorders(110).
The most common and frequent cause of anaemia is iron deficiency anaemia. Iron deficiency anaemia may occur due to malabsorption of iron, reduced intake, chronic inflammation, blood loss due to menstruation, pregnancy, renal disease, intestinal polyposis, peptic, duodenal ulcers, internal bleeding and malignancy(111). Patients with iron deficiency anaemia present with pale skin, cold feet and hands, fatigue or loss of energy, dizziness, dyspnea, tachycardia, palpitations, koilonychia (brittle spoon- shaped nails), myalgia or muscle weakness. Oral manifestations include pale oral mucosa, glossitis, glossodynia, angular cheilitis, recurrent aphthous stomatitis and burning mouth or oral mucosa(112).
Some tests to identify an iron deficiency include complete blood count, peripheral blood smear, serum iron, haemoglobin count, hematocrit, total iron binding capacity, ferritin, endoscopy, colonoscopy and additional imaging. The treatment choices have been to rule out malignancy, diagnose underlying medical conditions, dietary modification, and iron supplementation with vitamin C, iron or blood infusion(113).
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9.18.2  Plummer- Vinson Syndrome
Plummer- Vinson syndrome (PVS) is a collection of disorders comprising iron deficiency anaemia, dysphagia, glossitis and oesophagal web(114). Dysphagia is the central feature of PVS, and other clinical features and oral manifestations overlap with iron deficiency anaemia(115). Increased prevalence is seen in postmenopausal women. PVS bears an increased risk for squamous cell carcinoma; hence, early diagnosis is the key to timely treatment. Management is similar to iron deficiency anaemia with iron supplements and administering parenteral iron. Mechanical dilation via endoscopy can resolve oesophagal strictures(116). Prompt biopsy would reveal dysplasia or malignancy diagnosis. A periodic follow- up is encouraged with a definitive diagnosis of PVS(117).
9.19   Vitamins
Micronutrients and vitamins are synthesised endogenously in minimal amounts required for normal growth and development. Vitamin deficiency is observed in low and middle- income countries, leading to devastating complications. Vitamins are categorised based on water and fat- soluble absorption. The water- soluble vitamin B complex and C are essential for the appropriate function of blood cells, vessels and nerves(118). The fat- soluble vitamins include A, D, E and K, which are necessary for vision, immune function, bone regulation and hemostasis(119).
9.19.1  Vitamin A
Vitamin A or retinol is essential for tissue growth, differentiation and regulation of vision. Vitamin A sources include meat, eggs and certain vegetables. Deficiency of vitamin A results in initial ocu­lar changes, ranging from lack of vision adaptation to blindness in severe cases.
9.19.2  Vitamin B Complex
Vitamin B complex deficiency is uncommon in North America; however, patients with mal­absorption, alcohol disorder and vegetarian or vegan dietary practices may encounter such inadequacies. The vitamin that encompasses vitamin complex are B1 (thiamine), B2 (riboflavin), B3 (niacin), B5 (pantothenic acid), B6 (pyridoxine), B7 (biotin), B9 (folate) and cyanocobala­min (B12).
9.19.3  Thiamine (Vitamin B1)
Thiamine is vital as a coenzyme in glucose metabolism to produce adenosine triphosphate (ATP). A deficiency of thiamine leads to a condition called beriberi, commonly found in patients with malnutrition, consuming polished rice, who underwent gastric bypass surgery and alcoholics. Clinical manifestations include cardiovascular disease with dyspnea, oedema and heart failure, neurological symptoms with neuropathy, polyneuritis and muscle wasting. Wernicke encephalop­athy due to destruction of the thalamus, a prominent condition with a triad of delirium, ophthal­moplegia, and ataxia, ultimately resulting in dementia, coma and death.
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9.19 Vitamins
9.19.4  Riboflavin (Vitamin B2)
Riboflavin is a coenzyme that plays a major role in cellular function, energy synthesis, growth, devel­opment, and metabolism of lipids, steroids and certain medications. Riboflavin deficiency manifests as skin, endocrine, reproductive, and neurological disorders and noticeable oral changes include edematous, atrophied oral mucosa, glossitis, angular cheilitis and recurrent aphthous stomatitis.
9.19.5  Niacin (Vitamin B3)
Niacin is also a coenzyme that plays a significant role in DNA production, repair, antioxidation and production of ATP. Inadequate vitamin B3leads to a state called pellagra, popularly known as a 3D or 4D presentation with dermatitis, diarrhoea, dementia and, in severe cases, death. These patients may also manifest with glossitis, erythematous, raw- looking tongue and atrophy of the oral mucosa.
9.19.6  Pantothenic acid (Vitamin B5)
Pantothenic acid is an element of coenzyme A, which helps achieve metabolic functions, formation of hormones and lipid metabolism. Deficiency may result in alopecia, dermatitis, AI and enteritis.
9.19.7  Pyridoxine (Vitamin B6)
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Pyridoxine forms RBSCs, transamination, glycogen, protein and lipid metabolism. Sideroblastic anaemia, seizures, convulsions, peripheral neuropathy, confusion and weakness are some of the indicators of pyridoxine deficiency. Glossitis and cheilitis are common oral features of vitamin B complex insufficiency.
9.19.8  Biotin (Vitamin B7)
Biotin is required for carbohydrate, protein and lipid metabolism. Since biotin is a significant pro­vider of keratin, it improves skin quality, nails and hair. Deficiency of biotin owes to cardiovascular disorders, anaemia, depression, myalgia and poor quality of hair, skin and nails.
9.19.9  Folate (Vitamin B9)
Folate is significant in forming DNA, RNA and protein metabolism. Additionally, its supplements aid in producing healthy RBCs crucial for appropriate foetal growth during pregnancy. Avoiding alcohol use and diligent folate supplementation during pregnancy prevents neural tube defects and megaloblastic anaemia.
9.19.10  Cobalamin (Vitamin B12)
Cobalamin is necessary to function and support the nervous system and erythropoiesis. It inte­grates with intrinsic factors in the intestine for fortified absorption. Vitamin B12 is naturally found in animal foods; vegetarians may invariably have a deficiency. Along with evident autoim­mune destruction of intrinsic factors, administration of certain medications and intestinal surgery
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make cobalamin absorption challenging. Its clinical presentation is apparent with neurological symptoms and pernicious anaemia. Oral symptoms and signs include erythematous, atrophic oral mucosa with burning, tingling sensation with paresthesia or numbness. Schilling test dem­onstrates deficiency of cobalamin. Furthermore, antibodies to intrinsic factors exclusive for per­nicious anaemia and increased serum levels of methylmalonic acid and homocysteine protein byproducts capture cobalamin activity.
9.19.11  Vitamin C
Vitamin C is a distinct antioxidant that prevents the formation of free radicals. It is required for collagen growth, bone formation, blood vessels and nervous tissues and for boosting the immune system. Vitamin C deficiency is termed scurvy, leading to delayed wound healing, petechiae, ecchymosis and haemorrhage. Oral manifestations include widespread gingivitis, ulceration and periodontal infection.
9.19.12  Vitamin D
Besides calcitonin and parathyroid hormone, vitamin D regulates the skeletal system. Dietary inadequacy and deprivation from sunlight may negatively influence a person’s oral health. A deficiency of vitamin D in children results in rickets, and adults develop osteomalacia. Clinical presentation includes growth deficiency, bowlegs and defective mineralisation leading to enamel hypoplasia. Similarly, a fragile bone in osteomalacia may present with diffuse bone pain and frequent pathological fracture due to disrupted bone remodelling, poor calcification and osteoid formation. Radiographic examination reveals sparse trabeculae and thinning of lamina dura and cortex. Vitamin D supplementation has been the first treatment choice for rickets and osteomalacia.
Vitamin D- resistant or hypophosphatemic rickets are typically caused secondary to inherited disorders, renal failure or multiple myeloma(120). Inability to resorb phosphorus, decreased serum levels of phosphorus and low calcium and bone density leads to retarded growth and bony changes(121). Patients may manifest with osteopenic mandible with a granular bone pat­tern, thin enamel, large pulp, frequent periapical infections, pulpal necrosis and premature tooth loss(122).
9.19.13  Vitamin E
Tocopherol, or vitamin E, is a fat- soluble and effective antioxidant. Deficiency or malabsorption of vitamin E is less common, resulting in retinopathy, decreased immune function, peripheral neu­ropathy and ataxia. Dietary sources and vitamin supplements can be provided, although there is an increased risk of bleeding.
9.19.14  Vitamin K
Vitamin K is needed for the production of clotting factors. Vitamin K deficiency is seen in malab­sorption and patients with prolonged antibiotic use. Ineffective production of vitamin K results in coagulopathy due to defective clotting factors, gingival and systemic haemorrhage.
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References
9.20   Inborn Errors ofMetabolism andTheir Oro- facial Manifestations
9.21   Hypophosphatasia
Hypophosphatasia is an uncommon inherited metabolic disorder caused by a gene mutation in an autosomal recessive or dominant inheritance. It is characterised by a deficiency of non- descript alkaline phosphatase, which helps in osteoblastic and odontoblastic production. There are six forms of hypophosphatasia depending on the age of diagnosis: perinatal benign, lethal, infantile, childhood, adult and odontohypophosphatasia(123). Infants may exhibit disruptive skull ossifica­tion, bowed legs, bone pain and defective bone growth similar to rickets(124). Delayed tooth erup­tion, thin hypoplastic enamel, large pulp chamber and root canal and thin cortices may represent clinical and radiographic features. There is no therapy for hypophosphatasia; enzyme replacement has shown some benefits(125).
9.22   Summary
A complex biofeedback mechanism with neuro- hypothalamic signalling reaches the target organs for diverse biological functioning. Any impairment in the feedback mechanism or their signalling negatively impacts development and quality of life. Anatomical, physiological and pathological aspects, including oro- facial manifestations of endocrine and metabolic disorders, are discussed in this chapter.
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