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At least 847 records · Page 47Linked to original sources
PubMed1997

The coronoid process as a cause of mandibular hypomobility--case reports.

In an attempt to draw the clinician's attention to the coronoid process site while evaluating the aetiology of the restriction of mandibular opening, four cases are illustrated. These cases represent a diversity of causes hampering the free rotational movement of the coronoid process in space during jaw function. Case 1 is an example of unilateral hyperplastic coronoid process and osteochondroma; case 2 shows unusually shaped short and divergent coronoid processes combined with a bucally displaced maxillary third molar on one side; cases 3 and 4 represent an anatomical variation of an extremely narrow vestibular space due to the close proximity of the medial aspect of the coronoid process to the distal molar. It is suggested that each clinical examination include the width of the buccal vestibular space while performing mandibular movements.

Adult↗
PubMed2004

[Tooth transposition: results of an enquiry among practitioners].

A questionnaire was sent to orthodontists in order to analyse transpositions of teeth and their treatment. The results of this study confirm that most transpositions are maxillary canine/premolar transpositions. These transpositions were found to be often associated with other dental abnormalities (such as agenesis and peg-shaped laterals). Considerable evidences supports they are genetic in origin, but, in accordance with the demands of evidence-based science, further study is needed to prove it. The results suggest that most practitioners try to correct transposition despite the many difficulties involved. Early diagnosis did not reduced treatment time nor diminish difficulties.

Bicuspid↗
PubMed1999

Sensory disorders after separation of the nasopalatine nerve during removal of palatal displaced canines: prospective investigation.

During a prospective study after separation of the nasopalatine nerve at the foramen incisivum during exposure or removal of impacted and palatal displaced maxillary canines, 59 patients were examined neurologically for 4 weeks postoperatively over an investigation period of 18 months. During the first week after the operation, subjective as well as objective sensory disorders were found in all of the patients, but after 4 weeks at the most no neurological deficit could be detected in any patient.

Adolescent↗
PubMed2000

Adequacy of maxillary dental arch width in patients with palatally displaced canines.

This study investigates maxillary dental arch width in subjects with palatally displaced canines. Pretreatment dental casts of orthodontic patients with one or both maxillary canines palatally displaced (n = 31; male, 10; female, 21) were collected. This sample was matched according to sex and age with pretreatment dental casts from unaffected orthodontic patients. Arch widths were recorded between the maxillary first premolars and between the maxillary first molars. Interpremolar arch width and intermolar arch width comparisons between the sample with palatally displaced canines and the reference sample showed no statistically significant differences in their means, thus indicating that there was no statistically significant difference in the anterior and posterior arch width between the affected subjects and the control subjects. Thus, affected patients exhibit adequacy of maxillary dental arch width. This evidence refutes earlier conclusions that deficiency in maxillary transverse arch width is an associated contributing factor in the genesis of the anomaly of palatally displaced canines. Clinically, adequacy of dental arch width helps explain the "nonextraction" diagnostic appearance of most of these patients when they present for treatment.

Adolescent↗
PubMed2001

A unique treatment approach for maxillary canine-lateral incisor transposition.

Maxillary canine-lateral incisor transposition [Mx3-2] is a relatively rare anomaly, with both dental and facial esthetic implications. A challenging treatment approach for selected cases is described in detail, including the mechanics and sequencing used to align the completely transposed teeth to their normal anatomic position in the arch. The long-term esthetic outcome warrants the longer treatment time and greater efforts required in the successful treatment of this unusual abnormality.

Child↗
PubMed2002

Concomitant occurrence of canine malposition and tooth agenesis: evidence of orofacial genetic fields.

Certain discrete malpositions of the human canine tooth and agenesis of at least 1 tooth (hypodontia) are abnormalities known to occur together frequently. This study examines the specificity of tooth-agenesis sites associated with the occurrence of 3 unambiguous canine malpositions: palatally displaced canine (PDC; n = 58), mandibular lateral incisor-canine transposition (Mn.I2.C; n = 60), and maxillary canine-first premolar transposition (Mx.C.P1; n = 43). A fourth sample was formed from 4 cases of combined occurrence of PDC and Mn.I2.C, the only combination-phenotype noted among the 161 subjects. Oral panoramic radiographs were used to identify agenesis of at least 1 third molar (M3), mandibular second premolar (MnP2), and maxillary lateral incisor (MxI2)-the 3 most frequently absent tooth types among people of European descent. PDC and Mn.I2.C transposition appear to be associated with significantly increased M3 agenesis (P <.01), representing the posterior orofacial field, and Mx.C.P1 transposition appears to be associated with conspicuously elevated MxI2 agenesis (P <.001), representing the anterior orofacial field. MnP2 agenesis appears to represent an intermediate field, found in significantly elevated frequencies with all 3 canine positional anomalies. Coupling these new clinical findings with results from recent molecular studies, we suggest that transcription factors such as MSX1 and PAX9, which have been associated with agenesis of molars, might be involved in the genetic control of Mn.I2.C transposition and PDC, tooth malpositions connected here with the specific expression of posterior-field (M3) hypodontia.

Adolescent↗
PubMed2002

Maxillary tooth size variation in dentitions with palatal canine displacement.

The association between the presence of palatally displaced maxillary canines (PDC) and other anomalies is well known, particularly with regard to the size and form of the lateral incisor. The present study investigated the connection between the maxillary canine anomaly and the existence of a reduction in the size of the other teeth in the maxilla in 58 consecutively treated patients (37 females, 21 males) aged 11-15 years, and compared these with a control group of 40 consecutively treated subjects (20 males, 20 females) with normally erupted maxillary canines. The findings indicate that the teeth of PDC males are reduced in size and similar to those of PDC females, in sharp contrast to the general population, where males have larger teeth. This is the result of a dimensional reduction in the teeth of PDC males, which was statistically significant for all teeth (P < 0.01) in the bucco-lingual (B-L) dimension, and for the first premolars and first molars in the mesio-distal (M-D) dimension. The sole teeth affected for both sexes were the lateral incisors in their B-L dimension. Bilaterally and unilaterally affected subjects presented differing M-D and B-L tooth dimensions.

Adolescent↗
PubMed2003

Tooth size in dentitions with buccal canine ectopia.

Much interest has been expressed in recent years regarding various features common to dentitions with palatally displaced canines (PDC), particularly in relation to delayed dental development and reduced tooth size. The aims of the present study were to determine whether dentitions with buccally displaced canines (BDC) have features in common, which may be specific for the condition, when compared with PDC dentitions and those with normally erupting canines. Mesiodistal and buccolingual tooth dimensions were determined for 41 subjects with BDC (21 females and 20 males) aged between 11 and 15 years, who formed the experimental sample. The PDC sample was made up of 58 individuals (37 females and 21 males) and the control group comprised 40 age-matched and consecutively treated subjects (20 males and 20 females), exhibiting normally erupted and undisplaced maxillary canines. The results revealed marked sexual dimorphism. Larger-than-average teeth were present in BDC females, whereas the teeth in BDC males were normally sized. Unilaterally affected females had smaller teeth than bilaterally affected females. Tooth size in BDC was consistently larger than in PDC subjects, although the reason was different between the sexes. In females the PDC teeth were normally sized versus large BDC teeth, whereas in the males, the PDC teeth were small and the BDC teeth normal. It is concluded that combining male and female subjects into an overall BDC group obscures important differences that exist between the two sexes.

Adolescent↗
PubMed2005

Maxillary canine anomalies and tooth agenesis.

The aims of the study were to analyse the records of 26 subjects (18 females, eight males) with maxillary canine-first premolar transposition (Mx.C.P1) together with 160 subjects with a palatally displaced canine (PDC) to determine the pattern of tooth agenesis in these cases and to compare them with similar samples reported in the literature. A strong association between Mx.C.P1, lateral incisor and lower second premolar agenesis was found, with a 20 per cent prevalence of lateral incisor agenesis and a 24 per cent prevalence of lower second premolar agenesis. There was a lesser association with third molar (M.3) agenesis, with a prevalence of 52.2 per cent. Weaker associations were found for a PDC, with a prevalence of 5 per cent for lateral incisor agenesis. The prevalence of lower second premolar (5 per cent) and M.3 (27.5 per cent) agenesis approached reference values. Evidence for the implication of the MSX1 or PAX9 genes in the aetiology of PDC was weak.

Adolescent↗
PubMed2006

A sella turcica bridge in subjects with dental anomalies.

Calcification of the interclinoid ligament (ICL) of the sella turcica, or sella turcica bridging, has been associated with severe craniofacial deviations. Despite no comprehensive study on the sella turcica bridge, a relationship with tooth and eruption disturbances has been reported. In order to investigate whether congenital absence of the second mandibular premolar, or the presence of a palatally displaced canine (PDC), is associated with sella bridging, a retrospective study was performed. Lateral cephalometric radiographs from 20 males and 14 females, aged between 8 and 16 years, with a PDC and second mandibular premolar aplasia were reviewed and compared with a control group. A standardized scoring scale was established to quantify the extent of a sella turcica bridge from each radiograph (no calcification, partially calcified, and completely calcified). The prevalence of complete calcification of the ICL in adolescents with dental anomalies was equal to 17.6 per cent, while an incidence 9.9 per cent was found in the control group. A partially calcified sella turcica was observed in 58.8 per cent of adolescents with dental anomalies compared with 33.7 per cent in the control group. The association between the degree of calcification of the ICL and the presence of dental anomalies in the studied adolescents was statistically significant according to chi-square statistics (P = 0.004). This was confirmed by Fisher's exact test (P = 0.003). According to these findings, the prevalence of a sella turcica bridge in adolescents with dental anomalies is increased, while age and gender do not greatly influence ossification of the ICL. The very early appearance during development of a sella turcica bridge should alert clinicians to possible tooth anomalies in life later.

Adolescent↗
PubMed2002

The Orthoworld Specialist Practitioner Prize Cases 2000.

This paper describes the orthodontic management of three diverse malocclusions that were awarded the Orthoworld Specialist Practitioner Prize (2000) and presented at the British Orthodontic Conference in Harrogate 2001.

Adolescent↗
PubMed1997

Unilateral cleft lip repair in the presence of a vermilion hemangioma.

This case describes a repair of a unilateral cleft lip complicated by a lip hemangioma. The relevant issues regarding timing of the repair include safety of the procedure by minimizing blood loss during excision of the hemangioma and minimizing anesthesia risk. In obtaining a lasting cosmetic result, excision of the hemangioma would need to be done when the potential for residual tumor growth would be least likely (during tumor involution). Finally, the difficult issue of psychosocial concerns would balance the need for traditional early cleft repair with a definitive repair prior to increased social interaction in school. All these concerns were met with a delayed single-stage repair after partial involution of the hemangioma. We feel that a single-stage excision and lip repair is an acceptable option. It is reasonable to delay the cleft lip repair until significant involution of the hemangioma has occurred. An acceptable aesthetic result is obtainable.

Child, Preschool↗
PubMed2005

Hypodontia in an adolescent with the HbSC genotype: a case report.

The haemoglobin SC (HbSC) genotype is a variant form of haemoglobin disorder that often presents less frequent clinical symptoms of sickle cell disease (SCD) than the homozygous state (HbSS). Various dental abnormalities, such as enamel hypoplasia, hypomineralization, midline diastema and delayed eruption of the teeth, have been associated with SCD. This report presents the case of an adolescent patient with HbSC who had hypodontia, transposition of a permanent canine, retained primary teeth, multiple carious lesions and poor oral hygiene complicated by sickle cell crisis. This report focuses on the need for preventive care in such patients to reduce functional and aesthetic complications.

Adolescent↗