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At least 163 records · Page 9Linked to original sources
PubMed1989

[The surgical-orthodontic classification of retained and dystopic teeth of the second dentition in dysostosis cleidocranialis].

Dysostosis cleidocranialis concerns both teeth and jaw and is characterized by supernumerary teeth, dentitio tarda, tooth impaction and eventually follicular cysts. The concept of treatment can be divided in two stages: 1. At the beginning of the delayed secondary dentition (dentitio tarda) the operative removal of the supernumerary tooth germs and 2. corresponding to the belated morphological development (dentitio tarda) the operative exposure of the impacted teeth of the secondary dentition. The first operation facilitates a morphological development and especially a vertical drift without any obstacles. The second becomes necessary when only the morphological development, but not the vertical drift of the teeth of the secondary dentition takes place. The operative exposure is done using a self-developed technique [13, 18]. At the same time as the exposed teeth undergo a spontaneous vertical drift, orthopedic treatment for anomaly is started.

Adolescent↗
PubMed1994

[Individual variability in the duration of the second phase of the mixed dentition].

With a collection of dental casts from a longitudinal study of 175 orthodontically untreated probands (100 children without and 75 children with premature loss of deciduous molars and/or canines) serving as a base, the duration of the second period of mixed dentition was determined to be in relation to the probands the period of time between the gingival emergence of the first permanent buccal tooth and the full eruption of the set of teeth. The second period of mixed dentition in boys without premature loss of deciduous molars and canines lasts on an average 3.6 +/- 1.1 years and in girls 3.8 +/- 1.0 years. In cases of premature loss of deciduous molars and/or canines, the period of dentition is distinctly longer than under normal development conditions. The outside parameters (boys: Xmin = 0.9 years, Xmax = 6.2 years; girls: Xmin = 2.6 years, Xmax = 8.6 years), reflect a high degree of variability. The duration of the second period of mixed dentition is significantly affected by "the point in time of inception" and by the criteria "morphologically intact support zones" and "premature loss of deciduous molars and/or canines". Even given such data, however, it is not possible to make a sufficiently reliable prediction on an individual basis of the duration of the dentition.

Child↗
PubMed2002

Orthodontic space closure without counterbalancing extractions in patients with bilateral aplasia of the lower second premolars.

BACKGROUND: Orthodontic space closure in situations with bilateral aplastic lower second premolars without maxillary extractions is a rarely practiced treatment method. Due to the high risk of severe side effects, preference is currently given to the maintenance of deciduous second molars and subsequent prosthodontic solutions. As a combination of Class I push and Class II pull mechanics seemed likely to reduce secondary effects by transferring the anchorage site from the reactive lower anterior teeth to the more resistant upper arch, a clinical study was carried out in order to investigate effects and secondary effects of the mechanics. PATIENTS AND METHOD: Casts, panoramic radiographs and lateral headfilms of 13 consecutively treated, non-selected adolescents (seven boys, six girls, mean age at start of treatment 13 years 4 months) were evaluated. In six patients a Jasper Jumper trade mark was inserted in addition for a mean period of 6 months. RESULTS: The treatment outcome after a mean period of 3 years and 1 month showed in almost all cases the desired Class III molar occlusion of one cusp width (+/- 1/4 cw) with overbite and overjet within the normal range. Analyses of static and dynamic occlusion revealed anterior/canine protected articulation and a satisfactory number of centric contact points. A significant space gain (p </= 0.01) distal to the lower second molars (right side: 4.9 mm, left side: 5,3 mm) confirmed a relevant movement of the lower molars to mesial and an increased probability of being able to save the lower third molars as a natural substitute for the aplastic second premolars. Mean reductions in incisor inclination were low (0.5 degrees ) in the upper and moderate (4.3 degrees ) in the lower arch. CONCLUSION: Bearing in mind that supporting anchorage measures may be needed to compensate for unfavorable cofactors, the investigated treatment method can be recommended for those patients giving preference to a prosthetic-free dentition and to avoiding surgical interventions.

Adolescent↗
PubMed2003

Results of transplanting developing third molars as part of orthodontics space management. Part 2: results following the orthodontic treatment of transplanted developing third molars in cases of aplasia and premature loss of teeth with atrophy of the alveolar process.

MATERIAL AND METHODS: The aim of this study was to assess the effects of atrophy of the alveolar process and subsequent orthodontic treatment on the transplantation results of developing third molars. The material consisted of 35 teeth transplanted to an atrophied alveolar process. 19 of these teeth were treated orthodontically subsequent to transplantation. The control group consisted of 61 developing molars transplanted to a new extraction socket. The transplanted teeth were followed up clinically and radiographically for a mean period of 3.2 years. RESULTS: The success rate was 85% for transplants to new extraction sockets and 84% for transplants to atrophied jaw sections with subsequent orthodontic treatment. In contrast, transplants to atrophied jaw sections without subsequent orthodontic treatment showed a significantly (p < or = 0.001) lower success rate of only 37.5%. These poorer results were due to persistent infraocclusion and ankylosis. CONCLUSIONS: Even in cases with atrophy of the alveolar process, a transplantation with subsequent orthodontic treatment represents a promising treatment concept, whereas teeth without subsequent orthodontic treatment showed a lower success rate. Orthodontic tooth movement had no negative effect on the healing rates of transplanted developing third molars.

Adolescent↗
PubMed2003

Maxillary canine displacement and genetically determined predisposition to disturbed development of the dentition.

BACKGROUND: The relationship between maxillary canine displacement and the simultaneous occurrence of "genetically determined predisposition to disturbed development of the dentition" as defined by Hoffmeister was investigated in 675 patients. PATIENTS AND METHODS: Panoramic radiographs taken of each patient during the first and the second mixed dentition periods were evaluated. Canine inclination and the distance between the tip of the canine and a line connecting the cusps of the molars were computed in five different age groups according to Dausch-Neumann. RESULTS: Statistical analysis revealed 34 patients with "potential canine displacement", who exhibited further symptoms of "genetically determined predisposition to disturbed development of the dentition" significantly more frequently than the total group. The symptoms concerned were agenesia, displaced tooth buds, rotated or tilted incisors, aplasia and microdontia of lateral incisors. CONCLUSION: Careful follow-ups in patients with a predisposition to disturbed dental development enables risks to be anticipated and canine displacement to be detected at an early stage.

Child↗
PubMed2003

Dental anomalies as a microsymptom of palatal canine displacement.

AIM: A retrospective study was performed to investigate whether palatal canine displacement is associated with other dental features permitting early clinical diagnosis of the eruption disturbance. PATIENTS AND METHODS: The study was based on the complete records of 235/8556 patients at the Department of Orthodontics, School of Dental Medicine, University of Freiburg i.Br. (mean age = 14.11 years) with at least one palatally displaced permanent canine. These patients were examined for ten different morphologic parameters, e.g. impaction and congenital absence of further teeth, hypoplastic, peg-shaped, rotated and congenitally missing upper lateral incisors, supernumerary teeth, Angle classification, and cover-bite (= "Deckbiss"). The data were compared with those of a control sample of the same size with physiologic upper canine eruption (mean-age = 10.0 years). Furthermore, in a right/left comparison the local influence of anomalies of the upper lateral incisors on palatal canine displacement was evaluated by multiple linear regression analysis. RESULTS: The statistical analyses revealed that the risk of palatal canine displacement was significantly higher in patients with hypoplasia, peg shape or congenital aplasia of upper lateral incisors, further impacted and congenitally missing teeth and cover-bite. The intergroup differences in terms of gender, rotation of upper lateral incisors and Angle classification were not statistically significant. The right/left comparison revealed a significantly higher risk of palatal canine displacement in association with an adjacent hypoplastic or peg-shaped lateral incisor and with aplasia of the contralateral upper incisor. CONCLUSION: The clinical significance of the study is that the occurrence of palatally displaced canines is often closely linked with other dental anomalies. In this context, anomalies of upper lateral incisors, aplasia or impaction of further teeth, and the anomaly of cover-bite may serve as indicators of palatal canine displacement. A retarded development of the upper lateral incisor seems to be more disturbing for physiologic canine eruption than aplasia. In patients exhibiting the stated microsymptoms, close clinical follow-up of the maxillary permanent canine eruption during the late exfoliation period is strongly recommended.

Adolescent↗
PubMed2005

Investigation of maxillary tooth sizes in patients with palatal canine displacement.

AIM: The aim of this retrospective trial was to investigate differences in mesiodistal and vestibulo-oral crown sizes of naturally, fully-erupted permanent maxillary teeth between patients with and without palatal canine displacement. PATIENTS AND METHOD: 115 patients (mean age: 14 years 10 months; females: 77 males: 38) treated in the Department of Orthodontics, University of Munich were included in the study. 65 of the patients showed at least one palatally-displaced canine. Diagnosis and the location of the displacement were determined on the basis of standardized radiographs and confirmed by surgical documentation. Each maxillary tooth's mesiodistal and vestibulo-oral width was measured using a dial caliper on each dental cast. Excluded were partially-erupted teeth and surfaces with caries or restorations that had to be measured. An analysis of available space was made by evaluating the pre-treatment dental casts of all patients included in the study. RESULTS: Comparing the tooth widths of patients with unilateral canine displacement with the corresponding contralateral quadrants, we noted a statistically significant difference, namely that the central and lateral incisors and the canines of the affected side were narrower than those of the non-affected side in the same patient. Moreover, the displaced upper canines showed an increase in vestibulo-oral dimension. Overall tooth width (including all tooth groups) in patients with palatally-displaced canines was significantly less than that in the control group. However, when comparing the crown diameters of unilaterally- and bilaterally-affected patients, no differences in tooth-size were observed. The space-analysis showed excessive dental-arch space in patients with a palatally-displaced canine. CONCLUSION: Patients affected by palatal canine displacement showed significantly smaller maxillary tooth size.

Adolescent↗
PubMed2005

Management of an extremely displaced maxillary canine.

CASE REPORT: Aligning a displaced maxillary canine into the dental arch is one of the most complicated problems in orthodontics. In cases of extremely high displacement, the tooth is frequently removed surgically. Because of the upper canines' significance to dental esthetics and functional occlusion, such a decision is a very serious one. This case report illustrates the treatment of an extremely high displaced maxillary canine. CLINICAL FINDINGS: The main diagnosis was the displacement and the retention of tooth 13 (in nearly horizontal position, apical to the neighboring teeth); further diagnoses were: transversal maxillary deficiency with frontal crowding and a distal bite of one premolar in width, a deep bite of 6 mm with contact in the palatal mucosa, mandibular midline deviation of 2.5 mm to the right, lingual eruption of teeth 32 and 42, retroinclination of the maxillary incisors, and retarded eruption of the permanent teeth. THERAPY: Initial treatment with active and functional appliances to correct the distal bite, midline deviation and deep bite. Surgical exposure of the high displaced canine at the age of 14. Onset of cuspid elongation with removable appliances and elastics, further movement with a transpalatinal bar and welded arm, and full alignment of the upper and lower arches with fixed appliances in both jaws. Stabilization of the orthodontic treatment results with retention devices. Duration of treatment: 5 years and 8 months. For the alignment of tooth 13, 2 years and 10 months were required; 1 year and 4 months were necessary with complete fixed appliance. CONCLUSIONS: The aim of this case report was to demonstrate the potential of aligning an extremely displaced canine. Because of the esthetic and functional importance of the upper canines, therapeutic alignment should be initiated, provided there are no indications to the contrary.

Child↗
PubMed1999

[Magnetic resonance tomography in dental radiology (dental MRI)].

PURPOSE: To demonstrate the usefulness of Dental-MRT for imaging of anatomic and pathologic conditions of the mandible and maxilla. METHODS: Seven healthy volunteers, 5 patients with pulpitis, 9 patients with dentigerous cysts, 5 patients after tooth transplantation and 12 patients with atrophic mandibles were evaluated. Studies of the jaws using axial T1- and T2-weighted gradient echo and spin echo sequences in 2D and 3D technique have been to performed. The acquired images were reconstructed with a standard dental software package on a workstation as panoramic and cross sectional views of the mandible or maxilla. RESULTS: The entire maxilla and mandibula, teeth, dental pulp and the content of the mandibular canal were well depicted. Patients with inflammatory disease of the pulp chamber demonstrate bone marrow edema in the periapical region. Dentigerous cysts and their relation to the surrounding structures are clearly shown. After contrast media application marked enhancement of the dental pulp can be found. CONCLUSION: Dental-MRT provides a valuable tool for visualization and detection of dental diseases.

Diagnostic Imaging↗