4. Developmental disturbances
of the oral region
Definitions: Congenital, Hereditary, Genetic,
Autosomal, Sex-liked, Dominant, Recessive,
Developmental, Acquired.
Classification
5. Prof F. SawairProf F. Sawair
Developmental Disturbances of soft tissue
Lip pits:
1- Commissural: common 1-20%, ↑adults
Autosomal D: in some cases
Uni/bilateral blind tracts at angle of lip, up to 4 mm
Saliva
Preauricular pits
6. 2- Paramedian lip pits: as deep as 2 cm
Van Der Woude Syndrome: AD; PLP + Cleft lip/palate
Popliteal pterygium syndrome: AD
In some cases, missing teeth.
7. Horizontal folds of mucosal
tissue
Inner aspect of U > L lip
Ascher syndrome:
Double lip: usually congenital
+ Goitre and edema
and dropping of upper
U eyelids
Blepharochalasis
14. Slightly raised area, about 2-4 mm, often bilaterally
Commonly located lingual to the cuspids
Attached gingiva
≈ incisive papilla
Histologically:
A focus of fibrovascular tissue
With an orthokeratinized /parakeratinized surface
Covers the osseous foramen of a nutrient blood vessel
Retrocuspid Papilla
17. Microglossia: isolated cases or
In most reports +
Malformations in the hands (no digits) &
feet (oromandibular-limb hypogenesis syndrome)
Cleft palate
Dental agenesia (lower incisors).
……Aglossia
20. Pseudo/relative: force the tongue to sit in an abnormal position:
Enlarged tonsils and/or adenoids
Low palate and ↓ oral cavity volume
Transverse, vertical, or AP deficiency in the maxilla or mandible
Severe mandibular deficiency (retrognathism)
Hypotonia of the tongue
22. Lingual thyroid nodule:
Thyroid tissue at mid-posterior dorsum of tongue
Failure of migration
Clinically: 2-3cm smooth sessile mass
Apparent during puberty or adolescence
Complications:
Hist:
23. ≈ 70%: no thyroid tissue in neck.
33%: Hypothyroidism (cause of enlargement)
Diagnosis:
Thyroid scan using iodine isotopes or technetium 99m.
CT & MRI: size and extent of lesion.
Biopsy: avoided (bleeding & ≈ source hormone).
• Parathyroid
• What happens if you give thyroxin
24. Fissured tongue:
Deep fissures may be seen in children or adults but ↑ with age
Clustering in families
Prevalence: worldwide varies but as high as 21%.
Complications:
In 20% of cases associated with geographic tongue: same gene
Down syndrome & Melkersson-Rosenthal Syndrome
Acquired cases
25. Geographic tongue (Benign Migratory Glossitis):
Filiform papillae
Clin: appearance, Prevalence (3%), age & +FH
Migrate & periods of remission
Asymptomatic but acidic & spicy food
26. Hist:
Edge: hyperparak, acanthosis & a dense AICI
Centre: atrophy & CICI
Association: fissured tongue, psoriasis (in 10%), Reiter syndrome
Neutrophilic infiltration
28. Median Rhomboid Glossitis: CPA
Appearance & site
Origin: Tuberculum Impar vs. Candida
Hist:
Not all cases improve with
antifungal therapy or show initial
evidence of fungal infection Kissing lesion
33. Anodontia
Hypodontia
3rd
Ms (20-25%); L 2nd
PM; U 2
Symmetrical or haphazard
Pmt > Pry
Etiology: unclear
Hereditary component
Msx1 and Pax9 control genes
Maternal age, LBW, Rubella, radiation, chemotherapy, idiopathic hypoparathyroidism
Disturbances in number
34. • Prevalence of hypodontia in primary dentition?
• Which primary teeth are most commonly affected?
• What happen to their successional teeth?
Oligodontia?
40. Supernumerary
Other sites: Paramolars & Distomolars
Mesiodens
Hyperdontia: single 80%, 2 in ≈ 20%, >= 3 in < 1% of cases
Pmt > Pry
1-3% of population
80-90% in maxilla
25% erupt
41. How do they develop
1/3 of supernumerary teeth in primary are
followed by supernumerary permanent teeth
Timing of their formation
42. The presence of a supernumerary tooth is the
most common cause for the failure of eruption of a
maxillary central incisor.
59. Excess Fluoride
Mostly PM, U incisors & 2nd
Ms
Fluoride mottling:
Mild: smooth E w white
patches or striations
Severe: yellow/brown/black E w
pits & grooves
Optimum
level of F
60. Hereditary Disturbances (genetic):
Affecting only teeth:
Amelogenesis Imperfecta
Generalized defects including teeth:
Ectodermal Dysplasia
Down syndrome
61. Amelogenesis Imperfecta
Inheritance: Autosomal dominant, recessive, X-linked.
Most of …..Enamel
…….on all teeth
………..in both dentitions
Other components of teeth are normal
Not associated with other health problems
Mutations in the ENAM, MMP20, KLK-4 and AMELX (5%)
genes cause amelogenesis imperfecta
62. Researchers have described at least 16 forms of AI.
Distinguished by their specific dental abnormalities
and by pattern of inheritance.
Incidence: 1 in 700 (Sweden) to 1 in 15,000 (USA)
63. Are there any reported cases of amelogenesis
imperfecta with no family history of the
disorder?
64. Hypoplastic type:
Thin E but normally mineralized (>D in radiodensity)
All E smooth teeth with
needle-like cusps
Not all E general roughness w
pitting & vertical grooves
Stains
65. Hypomineralized/hypomaturation type:
Most common form
E of normal thickness
Newly erupted: normal size & shape of teeth
Opaque, brown-yellow
E soft chalky and easily removed → gross attrition
E = D in radiodensity
67. Systemic disturbances:
o Rickets:
preD, hypocalcified w in interglobular D
o Hypophosphataemia:
in interglobular D, large pulp chambers & long pulp horns
with cracked E
68. o Hypophosphatasia:
preD, in interglobular D, large
pulp chambers
o Juvenile hypoparathyroidism:
Small teeth w hypoplastic E and short roots
Prominent incremental lines in D
o Cytotoxic agents:
Prominent incremental lines in D
69. Dentinogenesis Imperfecta:
Type I:
o Patients with Osteogenesis Imperfecta
o Autosomal dominant
Type III: Brandywine isolate:
Rare, isolated (Maryland)
Mutation in the DSPP gene
70. Type II: (Hereditary opalescent dentine)
Autosomal dominant but no OI
Bluish-gray, brown/yellowish
Both dentitions
72. Radiographs:
Φ Short, blunt root
Φ Obliteration of pulp with D
Φ Bulbous crowns
↑ Root fracture
73. Histologically:
Normal E
Normal mantle D
Rest of D: hypomineralized w , irregular, wide D tubules
often devoid of odontoblastic processes.
74. Originally it was thought that a defective DEJ was present; SEM
studies have disclosed a normal junction.
There is a tendency for enamel loss, and the cleavage of enamel likely
occurs within defective dentin underlying the DEJ.
Soft D attrition
78. Type I (Radicular Dentine Dysplasia):
Most common
Normal crowns
Radiographs:
Short, blunt, conical or absent roots
Obliterated pulp chambers & RC
Or pulp chamber is "crescent shaped".
Periapical radiolucencies but no caries
81. Type II (Coronal Dentine Dysplasia):
Roots are normal
Primary teeth:
DI clinically
Obliterated pulp chambers
Permanent teeth:
Normal color
Thistle-tube pulp chambers w pulp stones
82. Regional Odontodysplasia:
Unknown etiology
Regional
Anterior maxilla
Delay or failure of eruption
Irregular & hypoplastic enamel
D is thin with interglobular D
Pulp stones and widely open apices
Focal calcifications in the dental follicle
Radiographs: Ghost teeth
91. B. Hemifacial atrophy: (Romberg Syndrome)
Progressive unilat ↓ in face size (other parts)
Onset: 1st
or 2nd
decade
2.5 ys 5 ys 11 ys
92. Aetiology
Associated: hyperpigmentation & loss of facial hair
Intraoral: lips & tongue, alveolar bone, teeth (delay, short roots)
93. C) Cleft Lip & palate:
Cleft lip: Median nasal & maxillary process
Nostril complete or incomplete
Complete alveolar process & teeth
M > F; 25% of cases; 80% uni; 70% on L side
94. Cleft palate:
Lateral portions of palate
Degree
F>M; 30% of cases
Cleft lip & palate:
M>F; 45% of cases
Bifid uvula:
• Common in Asians and native Americans.
Developmental disorder: One of several disorders that interrupt normal development in childhood. They may affect a single area of development (specific developmental disorders) or several (pervasive developmental disorders). Manifested before age 18.
disorders of growth resulting from interruption of the orderly sequence of development at any stage by any agent or disease category. In other words, developmental defects are not only &quot;developmental&quot; in origin, but can arise from a vascular, traumatic, metabolic, toxic, nutritional, neoplastic or infectious etiology
van der Woude syndrome is the most common syndrome associated with cleft lip or cleft palate.
Popliteal refers to anatomical structures located in the back of the knee:
the popliteal pterygium (a web behind the knee)
Possible persistence of the lateral sulci on the embryonic mandibular arch
Other causes: trauma, oral habit
Sebaceous glands may appear in the mucosa as creamy-yellow dots. They are extremely common: probably 80% of the population has them, but they are rarely evident in infants (though they are present histologically). They may appear in children after the age of 3 years and increase during puberty. They seem to be more obvious in males, in patients with
greasy skin and in older people, and may be increased in some rheumatic disorders.
On occasions, may become hyperplastic:
&gt;15 lobules & slightly elevated
Yellowish lesion 5-10m
Tumors arising from the glands are exceedingly rare.
During and for several days after an upper respiratory or other acute infection, benign lymphoid aggregates become enlarged, erythematous and perhaps somewhat tender, but they do not reach a size greater than 0.8 cm. except on the posterior lateral tongue, where reported cases have been 1.5 cm. or greater in diameter. Without hyperplasia the aggregates are 0.1-0.4 cm. in size and have a pale yellow, semitransparent appearance
Ankyloglossia can affect feeding, speech, and oral hygiene as well as have mechanical/social effects. Ankyloglossia can also prevent the tongue from contacting the anterior palate. This can then promote an infantile swallow and hamper the progression to an adult-like swallow which can result in an open bite deformity. It can also result in mandibular prognathism; this happens when the tongue contacts the anterior portion of the mandible with exaggerated anterior thrusts
They noted that the phones likely to be affected due to ankyloglossia include sibilants and lingual sounds such as [t d z s θ ð n l].
mechanical limitations which included cuts or discomfort underneath the tongue and difficulties with kissing, licking one’s lips, eating an ice cream cone, keeping one’s tongue clean and performing tongue tricks.
A viable alternative to surgery is to take a wait-and-see approach. Ruffoli et al. report that the frenulum naturally recedes during the process of a child&apos;s growth between six months and six years of age
Surgery after 4 years
As with many lesions, medicine has identified a triad for those with macroglossia. It includes open bite deformity, mandibular prognathism, and malalignment.
If the tongue protrudes beyond the lips and is exposed to the air, drying of the tongue with resultant glossitis and bleeding is common.
Congenital hemihyperplasia
In people who have lost their teeth (edentulous), in the absence of dentures, enlargement of the tongue may occur.
Rarely, parathyroid glands are associated with the ectopic thyroid tissue. Giving throxine may be used initially to treat symptoms and size may regress
Radioactive iodine use instead of surgery.
Melkersson-Rosenthal syndrome is a rare condition consisting of a triad of persistent or recurring lip or facial swelling, intermittent seventh (facial) nerve paralysis (Bell palsy), and a fissured tongue.
Aging and local environmental factors
migratory stomatitis
Geographic tongue can affect all age groups; however, it is more predominant in adults than in children.
The manifestations of Reiter’s syndrome or reactive arthritis include the following triad of symptoms: an inflammatory arthritis of large joints including commonly the knee and the back (due to involvement of the sacroiliac joint), inflammation of the eyes in the form of conjunctivitis or uveitis, and urethritis in men or cervicitis in women.
At higher power, one can appreciate the neutrophilic infiltrate. Microabscesses are forming in the superficial layers. A PAS stain for fungus was negative (not shown). Cause of the lesion could be the neutrophilic infiltration.
In these cases the tongue is almost always affected.
Prior to biopsy, the clinician should be certain that the midline lesion does not represent a lingual thyroid, as it may be the only thyroid tissue present in the patient&apos;s body.
it is recommended that the patient be treated with topical antifungals prior to biopsy of a suspected median rhomboid glossitis.
Pitutary dwarfism, Downs Syndrome
These teeth are most commonly missing
Peg Root shorter
The condition of missing over 6 teeth, excluding 3rd molars or wisdom teeth, is called oligodontia
30-50% of people with missing primary teeth will have missing permanent teeth, as well.
Prevalence of hypodontia, excluding third molars was found to be 6.4%
Maxillary lateral incisors and1st molar
Hypo in primary less than 1% of population
Fingernails and toenails may be thick, abnormally shaped, discolored, ridged, slow-growing, or brittle.
Worldwide around 7,000 people have been diagnosed with an ectodermal dysplasia condition.
frontal bossing is common, longer or more pronounced chins are frequent, broader noses are also very common.
Salivary hypoplasia with xerostomia is sometimes seen.
Low-set ears hearing loss Exophthalmos hypertelorism hypoplastic maxilla
Extra digit congenital heart defects pre-natal tooth eruption
Maxillary 4th molar is the second most supernumerary tooth. Other supernumerary teeth are maxillary paramolars, mandibular premolars and maxillary lateral incisors.
Continued proliferation of primary or prm dental lamina to form third tooth germ
May develop long after eruption of permanent dentition
If contact of teeth occur when a portion of the tooth crown has completed its formation there may be union of roots.
The defect is observable only in dental radiographs; there is no clinically obvious malformation. hypoplastic-hypocalcified amelogenesis imperfecta.
Fixed appliance orthodontic treatment may cause root resorption in taurodont molars
Dental extractions These may be more complicated in taurodontism as the tooth furcation is located more apically.
This may in turn affect the anchorage value of a taurodont molar during orthodontic treatment.
endodontic restorative management of such teeth is affected by the presence of a large pulp cavity located in a more apical position.
Confluency of cementum between adjacent teeth may occur with two normal molars, yet is perhaps more often encountered between a normal molar and a supernumerary molar (i.e., paramolar or distomolar). Concrescence may occur in both impacted and erupted teeth.
Before or after eruption
Because of the location of the permanent tooth&apos;s developing tooth bud in relation to the primary tooth, the most likely affected area on the permanent tooth is the facial surface
Spirochetes do not enter circulation until 16 wks of IU life after formation of primary teeth so not affected
The spots and stains left by fluorosis are permanent. They may darken over time.
0.7-1.2 ppm but recently because of wider use of fluoride in different product recommended 0.7 ppm
Excess f retain amelogenin lead to less maturation porosity reflection of light white chalky
DSPP - dentin sialophosphoprotein
Because dentinal tubules are haphazardly arranged and often devoid of odontoblastic processes, the teeth are not particularly sensitive, even when most of the enamel surface has been lost.
Affected teeth are not more prone than normal teeth to dental caries. Full crowns can be fabricated, even at an early age, because of the small, obliterated pulp chambers.
Root fractures are relatively common. When severe abrasion exists, an overdenture may be considered.
ghost teeth
the coronal morphologic and histologic features are normal.
Unlike dentinogenesis imperfecta, enamel fragmentation is not encountered. The coronal dentin shows normal tubular orientation, whereas the radicular dentin is whorled, giving the appearance of cascading waterfalls.
The dentin sialophosphoprotein (DSPP) gene on chromosome 4q21.3 encodes the major noncollagenous protein in tooth dentin and is mutated in dentin dysplasia type 2 as well as dentinogenesis imperfecta types II and III.
The etiology, developmental nonheridatry, mostly thought due to vascular supply deficiency
In fact, many cases have been reported in which vascular nevi involve the area of the face that harbors the hypoplastic teeth. Both permanent and deciduous predecessors may be affected.
Hyper
Calcinosis
Rheumatic fever
arthritis
Natal teeth are found more frequently than neonatal teeth in a proportion of three to one. The teeth most often associated with this anomaly are the mandibular central incisors followed by the maxillary central incisors. Generally the root is absent or poorly developed.
The history of long-standing facial asymmetry helps to limit the differential diagnosis. Facial hemihypertrophy must be differentiated from fibrous dysplasia and other osseous enlargements. This can be accomplished by obtaining radiographs, because no radiologic changes in osseous trabeculation occur in facial hemihypertrophy. In neurofibromatosis (NF1), facial plexiform neurofibromas may cause facial asymmetry that can be confused with congenital facial hemihypertrophy.
Often noted at birth, but in some later. Increase with age until growth ceases.
Only 3-8% of clefts are associated with syndromes; &gt;250 syndromes
The most common syndrome associated with cleft lip and palate together is van der Woude syndrome.
It arises embryologically from incomplete fusion of the medial nasal prominences.
embryonic mandibular and maxillary processes of the first branchial arch to fuse properly and form the corners of the mouth.