September 11th, 2009 by admin
Malpositioned canines are a considerable nuisance, from the point
of view of both the patient and the practitioner. They are difficult
to treat, the treatment is lengthy and demanding in terms of cooperation
on the part of the patient and in terms of technical
expertise on the part of the operator. The malpositioned tooth
can be left alone, or it can be extracted; it can be aligned by means
of orthodontic treatment, or it can be aligned surgically. Each
of these remedies has its own disadvantages. Is it possible to
intercept the developing problem and, by early intervention, persuade
the malpositioned canine to erupt into the correct position?
The commonest line of interceptive treatment that has been Read the rest of this entry »
September 11th, 2009 by admin
Crossbites involving posterior teeth are generally associated with
a discrepancy in width of the upper and lower dental arches. In
the case of a buccal crossbite, the buccal cusps of the lower teeth
occlude outside the buccal cusps of the upper teeth, with the
lower arch being disproportionately wide, or the upper narrow. In
the case of a lingual crossbite, the buccal cusp of the lower tooth
occludes lingual to the palatal cusp of the opposing upper tooth,
with the upper arch wide or the lower narrow. The discrepancy in Read the rest of this entry »
September 11th, 2009 by admin
An anterior crossbite (one or more maxillary incisors occluding
lingually to the opposing teeth) may become apparent when the
incisor teeth erupt. There may be dento-alveolar factors involved in the development of this anomaly, or the crossbites may be an
indication of an underlying skeletal discrepancy. Crowding,
resulting in the lingual displacement of the upper lateral incisors
may possibly be treated with a modified serial extraction technique.
An anterior crossbite may result from the prolonged retention
of a primary incisor (possibly a non-vital tooth that has failed Read the rest of this entry »
September 11th, 2009 by admin
The skeletal pattern (i.e. the relationship of the mandible to the
maxilla in the antero-posterior, transverse, and vertical dimensions)
is one of the most important factors governing the presence
or absence of a malocclusion of the teeth, being intimately related to both incisor overjet and overbite and to the occlusion of the
teeth in the buccal segments. There are two aspects of the skeletal
pattern which have to be taken into account: one is the size of the
mandible, relative to the size of the maxilla; the other is the position Read the rest of this entry »
July 14th, 2009 by admin
4-33% of children by 12 years of age. Twice as
many boys as girls.
World Health Organization (WHO) classification.
Majority of injuries occur at 7-10 years of age due
to falls during normal play.
Commonest injuries are uncomplicated (enamel Read the rest of this entry »
July 14th, 2009 by admin
Non-carious loss of tooth tissue. There are three
main types:
Attrition. Wear of a tooth as a result of tooth-totooth
contact.
Abrasion. Physical wear by something other than
tooth-to-tooth.
Erosion. Wear by a chemical process not involving
bacteria Read the rest of this entry »
July 14th, 2009 by admin
Transplantation of a tooth in the upper or lower
arch to a prepared socket in the same mouth
( Fig. 136).
I ncreasingly common and successful treatment of
trauma cases where an incisor has been lost or in
hypodontia cases where there may be crowding in
other quadrants.
Lower first and second premolars are the easiest
teeth to transplant.
Combined treatment planning with orthodontics,
oral surgery and paediatric dentistry.
I deally, root formation of the transplanted tooth
should be two-thirds complete, so that
revascularisation may occur.
July 14th, 2009 by admin
Prominent additional cusp.
Commonly on the buccal surface of primary first
molars, the palatal surface of primary second
molars, and palatal surfaces of permanent incisor
teeth (Fig. 133).
Maxillary permanent incisor ‘talon’ cusps often
cause malocclusion and may require removal and
elective root treatment once the root is fully
formed.
July 14th, 2009 by admin
Hyperdontia
Definition Additional teeth can either resemble the normal
dentition (supplemental) (Fig. 130) or be a simple
conical or tubercular shape (supernumerary).
Midline supernumeraries are also called mesiodens Read the rest of this entry »
July 14th, 2009 by admin
Autosomal dominant inheritance. Incidence is 1 in
8000.
Dentine is abnormal in structure and is translucent.
Three main types exist:
• Type I (associated with osteogenesis imperfecta)
• Type II (hereditary opalescent dentine)
• Type III (brandywine type).
Types I and II are similar: primary teeth are more Read the rest of this entry »
