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By means of objective radiological stereo-photogrammetry of two extraoral stereoscopic radiograms, the location of dislocated impacted teeth was determined preoperatively in a model. During operation it was possible to find the teeth at the computed position.
The purpose of this retrospective study was to analyze palatally displaced maxillary canines referred for specialist treatment compared with those successfully treated by the general practitioner by interceptive extraction of either the primary canine or the primary canine and primary first molar. Special interest was focused on chronological age, dental age and dental maturity as well as the position of the canine at the time of recognition and referral. The Interceptive Treatment group consisted of 50 consecutive cases from computerized records, median age 11.7 years (range 8.9-14.11 years). The Corrective Treatment group comprised 47 consecutive cases, median age 14.1 years (range 11.1-18.0 years), referred to the Department of Orthodontics. Information was obtained by assessing the patient charts and radiographs. The results show that age at the time of recognition and referral is the most important factor for the final outcome while the position of the canine concerning angle alpha and sector S is a compromising factor. The results suggest that about one third of the Corrective Treatment group might have had a reasonably good chance of the canine's erupting without corrective treatment if they had been diagnosed and treated with interceptive extraction of the primary canine at an earlier age.
A method has been devised for transporting and storing human teeth in vitro for autotransplantation and replantation. In the transplantation and replantation of accidentally lost teeth, the viability of the cells covering the root is of vital importance. Injury of the jaw and contamination of the tooth often prevent immediate replantation. To enable transportation and storage of teeth while maintaining viability of the periodontal ligament during the healing period after trauma, the following technique was worked out. With use of a transport medium and a tissue-culture technique, 35 human teeth were transported long distances (20 hours) to a tissue-culture laboratory and preserved for different periods of time. Three teeth were lost because of contamination. Twenty-one of the teeth were cultivated in tissue-culture medium at 37 C for four weeks; 11 of the teeth were stored in liquid nitrogen at -196 C for 27 weeks. After transportation and storage, it was possible to maintain the viability of the cells of the periodontal membrane of the teeth. Two cases are described wherein immediate transplantation and replantation were impossible. After transport to the laboratory, the teeth were stored for five weeks in one case and for three months in another case before replantation.
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Hypodontia is the congenital absence of one or more teeth because of agenesis. The most commonly missing teeth are the third molars, the maxillary lateral incisors and the second premolars. Cases are presented of three patients with a missing mandibular incisor.
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A modular, fixed-functional method has been described using a new generation of appliances that are smaller, more comfortable and more patient friendly, while gaining the advantages of a combined fixed-functional and postural therapy. The case has been made for the middle mixed dentition as the optimal starting time. Crowding, overbite and molar rotation are managed simply with a combined use of flexible lip bumpers, bite plane and sequential primary tooth extraction. In conclusion, Phase I Postural Therapy will be shown to have the following advantages: more biologically and patient friendly more conducive to non-extraction more efficient and cost effective simple fabrication and reduced chair time reduced Phase II fixed appliance time, and completion at a younger age.
Panoramic radiographs of 1,608 children and adolescents aged 10 to 15 years (797 males and 811 females) were reviewed to determine the prevalence of tooth and jaw abnormalities. Abnormalities were detected on 21 percent of the radiographs (23 percent females and 17.3 percent males); 879 teeth were diagnosed with abnormalities on 331 radiographs. The more common abnormalities were malpositioned teeth, missing teeth, misshaped teeth, and teeth with hypoplastic appearance. Bony abnormalities and growth problems were detected in a few radiographs. This study demonstrates the value of panoramic radiography in detecting or confirming dental abnormalities, and supports recommendations on the use of panoramic radiography to aid in the assessment of dental development.
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Explore the source record for details and available documents.