Search PubMed⌕ Search

SEARCH · Search PubMed

Results for “Tooth Migration”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 127 records · Page 7Linked to original sources
PubMed2002

A randomized clinical trial to compare the effectiveness of canine lacebacks with reference to canine tip.

AIM: To assess the effectiveness of canine lacebacks on the proclination of the upper incisors with reference to pre-treatment canine tip. STUDY DESIGN: Randomized clinical trial. SAMPLE: Patients receiving upper and lower fixed appliances attending the orthodontic departments of five orthodontic treatment providers. Sixteen patients received canine lacebacks as part of their treatment and 19 patients did not have canine lacebacks. METHOD: Patients were randomly allocated to receive canine lacebacks or not receive canine lacebacks. Upper study models were collected at the initial archwire placement and then when the working 0.019 x 0.025-inch stainless steel archwire was placed. The start canine angulation, change in upper incisor proclination/overjet, and any mesial movement of the upper first permanent molars during levelling and aligning was measured with a reflex metrograph. STATISTICS: The effect of the use of canine lacebacks on upper incisor proclination and mesial molar movement was assessed using Student t-tests. Regression analysis was used to evaluate any effect of the initial angulation of the canine. RESULTS: A mean incisor retroclination of 0.5 mm was observed in the canine lacebacks compared with a mean proclination of 0.36 mm when canine lacebacks were not used (P = 0.025). There was no statistically significant difference between groups for mesial movement of upper first molars (P = 0.99). If the canine was more distally inclined at the start of treatment, the incisors was more likely to procline, regardless of whether or not canine lacebacks were used (P = 0.027). CONCLUSIONS: The effect of canine lacebacks on preventing upper incisor proclination at the start of treatment is in the order of 1 mm and their effect on mesial molar movement is insignificant. Canines lacebacks have similar effects that are independent of pre-treatment canine angulation.

Adolescent↗
PubMed1983

The use of cranial bone grafts in the closure of alveolar and anterior palatal clefts.

A method is described for harvesting cancellous bone from the diploic space. In our opinion, this is the material of choice for bone grafting alveolar clefts in the 7- to 11-year age group. The procedure could be performed at an earlier age if the maxillary segments are under orthopedic control and in proper alignment. Success of the procedure depends on proper orthodontic preparation of the maxillary segments and careful, complete closure of the soft tissues across the anterior palatal cleft, the nasal lining defect, and the anterior alveolus. Results have been encouraging in terms of bone formation, and tooth migration into the bone graft can be expected if there has been no damage to the dental sac. Closure of the alveolar defect at the time of the primary lip closure would preclude the eventual need for a bone graft, but it cannot be accomplished without early, precise alignment of the maxillary segments if extensive periosteal denudation is to be avoided. The age beyond which periosteal closure alone will be inadequate to provide sufficient bone formation and should be supplemented by a bone graft remains to be established.

Adolescent↗
PubMedDate not supplied

Root intrusion in tooth-implant combination cases.

The various proposed etiologies for root intrusion in tooth-implant combination cases are discussed. Clinical examples of root intrusion are illustrated. Advantages and disadvantages of nonrigid connector and coping/suprastructure techniques are presented.

Dental Abutments↗
PubMed1993

Balancing the extraction of primary teeth: a review.

Balancing the extraction of primary teeth is a procedure advocated to maintain symmetry of the developing dentition by encouraging symmetrical drift of teeth mesial and distal to the extraction sites on each side of the dental arch. Current opinion about this procedure expressed in standard reference works is confused and occasionally contradictory. Whilst some authorities cite specific situations where balancing extractions should be performed, others are less precise with their advice, and at least one considers that there is little justification for the procedure. Scientific evidence supporting the procedure is tenuous. The one study carried out specifically to compare dental centre line shift following unilateral or bilateral extraction of primary teeth showed greater shift in cases of unilateral (unbalanced) extractions. Other studies do not directly address the issue and such information as they offer is imprecise. Although the procedure of balancing extractions is strongly advocated by many clinicians, it is not based on definitive experimental evidence.

Child↗
PubMed1994

Extraction of primary canine tooth buds: prevalence and associated dental abnormalities in a group of Ethiopian Jewish children.

Recent publications have described a common belief, held in rural areas in Africa, that unerupted primary canines cause diarrhoea, vomiting and fever in infants. To relieve these symptoms a traditional native healer extracts these tooth buds. The emigration of Ethiopian Jews to Israel in 1991 allowed an investigation of this practice among this community. A group of 59 children (27 boys and 32 girls) aged 3-12 years were examined clinically and radiographically. Evidence was found of extraction of 63 primary canine buds in 35 (59%) of the children. Extraction of one canine was found in 16 children, two in 13 children and three in three children, and three children had all four canines extracted. Forty-six (74%) mandibular compared to only 16 (26%) maxillary canines had been extracted; the extractions were equally divided between both sides of the jaws. Another 19 primary canines had hypoplastic defects, probably the result of unsuccessful extractions. Associated dental abnormalities included hypoplasia of the permanent successors and adjacent primary and permanent teeth, displacement of permanent teeth, midline shift to the extraction side, missing primary lateral incisors (probably accidentally extracted) and distal eruption of permanent lateral incisors, leaving their primary predecessors retained. Parental enquiry revealed that the practice is more common in rural rather than urban areas and still exists in the Ethiopian community in Israel. The findings of this survey should urge the authorities to take steps to stop this practice.

Child↗
PubMed1996

Papillon-Lefèvre syndrome. Analysis of peripheral blood lymphocyte subsets.

We have studied the peripheral blood lymphocyte populations in our 6 patients (2 female and 4 male) with a mean age of 11.19 with Papillon-Lèfevre Syndrome (PLS) using adequate monoclonal antibodies and double coloured flow cytometry. Total B, T, CD4, CD8, CD29, CD45RA, NK, HLA-DR cells were studied. Total B, T, CD4 and CD8 lymphocytes were within normal limits. We have observed an increase in the CD29 lymphocytes and NK cells and a decrease in CD45RA lymphocytes. We think that these findings are important in explaining B lymphocyte activation and in the pathogenesis of the PLS.

Alveolar Bone Loss↗
PubMed1996

Localization of glycosaminoglycans in periodontal ligament during physiological and experimental tooth movement.

Localization of chondroitin sulphates in periodontal ligaments (PDL) of rat molar roots during physiological and experimental tooth movement were analysed immunohistochemically with the use of monoclonal antibodies, 3B3 and 2B6, specific to chondroitin 6-sulphate (CH-6S) and chondroitin 4-sulphate/dermatan sulfate (CH-4S/DS), respectively. The maxillary first molars of experimental animals were forced to move laterally with a 10 g weight by U-shaped wires for 3 and 7 d. In control animals, 3B3 epitope was seen in the PDL near to the bone surface facing the distal half of roots, which corresponded to the compressive side during physiological tooth movement. Immunoreactivity for 2B6 was weak or negative in the PDL. Both epitopes were present at osteoid, precementum, lacunae and canaliculli of osteocytes and cementocytes. In 3-d-treated animals, the early stage of hyalinization characterized with visible cells and fibres was observed in the PDL at the buccal side of the mesial root, which showed intense immunoreactivity for 3B3. Further 3B3 positive area seen in control animals changed its position from the distal to the buccal side of the PDL. Immunoreactivity for 2B6 did not change in the PDL of 3-d-treated animals. In 7-d-treated animals, the typical hyalinization characterized with no visible cells and fibres was seen in the PDL at the buccal sides of both mesial and disto-buccal roots, where both epitopes were present at the peripheral part of the tissue. Observation of serial sections suggested that the 3B3-positive area was present at the peripheral part of the 2B6-positive area. The present results suggest that the expression of CH-6S is related to the compressive force in non-hyalinized and hyalinized PDL, whereas that of CH-4S/DS is not influenced by the mechanical stress.

Alveolar Process↗
PubMed1992

Ectopic eruption of a maxillary canine following trauma.

Traumatic events at an early age may lead to developmental dental anomalies and ectopic tooth eruption. A case is reported in which a traumatic injury at two months of age resulted in the development of supernumerary teeth in the upper right premaxillary region. The maxillary canine ectopically erupted or transposed into the space left by the missing central incisor and eliminated the need for a prosthesis in this region.

Child↗
PubMed1975

Back from the cuspid.

Denture reduction in formal orthodontic treatment does not appear to prevent the impaction of lower third molars. The extraction of premolar teeth is best carried out as close as possible to the eruption time of the cuspids. The posterior part of the mandibular arch should be evaluated by the study of lateral oblique roentgenograms and one of several options regarding treatment should then be adopted.

Adolescent↗
PubMed1980

D E space--a realistic measure of changes in arch morphology: space loss due to unattended caries.

By using only a portion of the dental arch, rather than some geometric construction that conforms to the dental arch, more pertinent information can be gathered regarding the sequelae of some event or insult to the arch. The measurement, D E Space, has been explained and utilized to describe the effectss of unattended dental caries on arch form. Only caries which become severe have a significant effect on the dental arch--a reduction in D E Space, which can be interpreted as relative arch length (depth) and is significant only for the year after its exfoliation. This occurs one year early and is also significant.

Child↗