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At least 163 records · Page 9Linked to original sources
PubMed1983

The etiology of maxillary canine impactions.

The etiology of tooth impactions has long been related to an arch-length deficiency. This is valid for most impactions, but not for palatal impaction of the maxillary canine. This study shows that 85 percent of the palatally impacted canines have sufficient space for eruption. The bud of the maxillary canine is wedged between the nasal cavity, the orbit, and the anterior wall of the maxillary sinus. The buds of the lateral incisor and the first premolar are located behind the canine's palatal surface. An arch-length deficiency will not allow the maxillary canine to "jump" the buds, the nasal cavity, or the sinus in order to reappear in the palate. A canine can be palatally impacted if an extra space is available in the maxillary bone. This space can be provided by (1) excessive growth in the base of the maxillary bone, (2) space created by agenesis or peg-shaped lateral incisors, or (3) stimulated eruption of the lateral incisor or the first premolar. In those conditions the canine is free to "dive" in the bone and to become palatally impacted. A dysplasia in the maxillary-premaxillary suture can also modify the direction of the maxillary canine's eruption.

Adult↗
PubMed1979

The 'ballista spring" system for impacted teeth.

The ballista spring system is a simplified orthodontic system for treating impacted teeth. The impacted tooth is retracted by a spring that accumulates a continuous force from being twisted on its long axis. The necessary operation on the impacted tooth is simple and less traumatic. The force exerted on the tooth is vertical, without compressing the impacted tooth toward the adjacent roots. This force is well controlled and easily modified. By the lack of appliance on the front teeth during a great part of the treatment, the esthetic side of the treatment is respected. Complicated impacted teeth in adults can be treated.

Cuspid↗
PubMed1995

[Corrective movement of a palatal impacted canine tooth: methodology and outcome of a combined oral surgery/orthodontic procedure].

In 24 patients, 31 palatal impacted maxillary canines were brought in position using the same surgical and orthodontic concept. After temporal surgical exposure a little silver chain was attached at the crown of the canine, the mucoperiostal flap was repositioned, and the canine was moved into its position by innovative orthodontic treatment means. The combined method is described intensively. With respect to the applied technique the results indicate that according to the criteria of periodontal status, vitality, bone support, root resorption and occlusion no differences exist to free erupted canines despite a mean orthodontic correction of 36.7 degrees.

Cuspid↗
PubMed2000

Surgical exposure and orthodontic extrusion of an impacted canine tooth in a cat: a case report.

A 7 month-old, male domestic shorthaired cat was referred because of facial swelling, an operculated cystic oral mass, and impaction of the associated maxillary left canine tooth. Surgical exposure and realignment failed to result in eruption. Surgical reexposure and orthodontic extrusion resulted in a functional alignment of the tooth within the dental arch. Follow up evaluations over the 5 ensuing years indicated persistence of the facial deformation, no evidence of ameloblastic biotransformation, and a healthy tooth.

Animals↗
PubMed2003

Maxillary odontogenic keratocyst with respiratory epithelium: a case report.

We report a case of odontogenic keratocyst with a respiratory epithelial lining and a malformed impacted tooth in the maxilla of a 39-year-old Japanese female who suffered from swelling symptoms for half a year. CT examinations revealed an air-filled cystic lesion with an impacted tooth crown in the maxillary bone which expanded to the nasal cavity as well as to the maxillary sinus. Histopathologically, the surgically removed cyst wall consisted of fibrous granulation tissue with a lining of parakeratinized squamous epithelium as well as ciliated pseudostratified epithelium and with retention of desquamated keratin materials in the lumen. The impacted tooth was malformed lacking a root portion. We discuss the frequency of respiratory epithelium in odontogenic keratocysts.

Adult↗
PubMed1999

Radiographic localization of unerupted maxillary anterior teeth using the vertical tube shift technique: the history and application of the method with some case reports.

The preferred means of radiographic localization is the parallax method introduced by Clark in 1910. He used 2 periapical radiographs and shifted the tube in the horizontal plane. In 1952, Richards appreciated that a vertical tube shift could also be carried out. No major changes then occurred in the technique until Keur, in Australia, in 1986 replaced the periapical radiographs with occlusal radiographs. This modification enables a greater tube movement and therefore a greater shift of the image of the impacted tooth; it also ensures that the whole of the tooth is captured on the radiograph. For the vertical tube shift, Keur introduced the use of a rotational panoramic radiograph with an occlusal radiograph. In 1987, Southall and Gravely discussed this vertical tube shift combination in the English dental literature, and it is now the preferred combination of radiographs for localizing impacted maxillary anterior teeth. Jacobs introduced this method to the American literature in 1999, but it has yet to gain acceptance in the continental European literature. Jacobs recommended, when using this combination, to routinely increase the vertical angulation for the occlusal radiograph by 10 degrees to achieve a greater image shift. Four case reports are presented in this article. Three have photographs taken at surgical exposure to illustrate how the position of the impacted tooth can be accurately predicted by appropriate interpretation of the radiographs.

Adolescent↗
PubMed1998

Computed tomographic features of calcifying odontogenic cysts.

OBJECTIVES: To describe the CT appearances of 4 cases of the calcifying odontogenic cyst (COC) with particular reference to the effect of varying the window settings. METHODS: Conventional radiographs and CT scans of 4 calcifying odontogenic cysts were analyzed with respect to the presence of an impacted tooth, root resorption and calcification. In addition, increased attenuation by desquamated keratin was examined by varying the window settings on CT. RESULTS: All lesions were located in the maxilla and on conventional radiographs, had unilocular radiolucency with a well-defined margin. Calcifications and inclusion of an impacted tooth were seen in all cases. Root resorption was observed in two cases, but was not prominent. On CT, calcification was detected at the periphery of the lesion and/or around the impacted tooth in all cases. Varying the window setting revealed an increased attenuation area due to desquamated keratin. CONCLUSIONS: Varying the window setting on CT is useful as a means of identifying both desquamated keratin and peripheral calcification in COC.

Adolescent↗
PubMed1980

Impacted teeth in relation to odontomas.

A retrospective investigation on the eruption of impacted teeth after surgical treatment of odontoma has been carried out. A total of 218 operative removals of odontomas took place in the Department of Oral Surgery, Royal Dental College in the years 1952-1974; 49 of these were localized directly in relation to an impacted tooth and were considered as the cause of impaction. In 42 cases there was sufficient material for the follow-up investigation. The morphology of the impacted tooth was normal in 62% (26/42); when deviation occurred, only the root was involved (11/13). After removal of the odontomas, 45% (19/42) of the impacted teeth erupted, 77% (13/17) of the remaining teeth erupted after a second operation. The results of this investigation suggest that three out of four impacted teeth related to odontomas will erupt after removal of the odontoma.

Adolescent↗
PubMed1990

[Radiographic study of odontomas].

Odontomas are the most common benign odontogenic tumors with a high degree of differentiation and an excellent biological behavior. Three histological types are recognised: a) ameloblastic odontoma, b) coplex odontoma and c) compound odontoma. Usually these tumors are asymptomatic and the most frequent cause of discovery is the retention or impaction of a permanent tooth. The purpose of this study was to analyze the clinical and radiographic features of these tumors and to determine the frequency and relation of odontomas to tooth impaction. Twenty six cases (14 males and 12 females) of histologically verified odontomas were studied and an effort was made in order to corellate the histological type of the tumors with the age, the sex, the location, the radiographic picture, the size of the lesion and the frequency and relation to the impacted teeth. The main conclusions of the study were: a) Odontomas are diagnosed more often in the first or second decade but the compound odontoma may be seen later in life. b) The most common location of odontomas is the anterior region of the maxilla, c) The radiographic picture of the complex odontoma is usually of the mixed radiolucent-radiopaque type, where compound odontoma is more often found as radiopacity or as non-typical tooth and d) Odontomas more often are located above the crown of the impacted tooth usually in maxillary incisors and canines.

Adolescent↗
PubMedDate not supplied

Impact of tooth wear on daily living.

PURPOSE: The aim of this study was to identify the effects of tooth wear on patients' quality of life and satisfaction with their dentition. MATERIALS AND METHODS: Seventy-six tooth wear patients and 76 control subjects were recruited for the study. A Dental Impact on Daily Living questionnaire was used to assess the affect of tooth wear on daily living and satisfaction with the dentition. An ordinal scale was used to assess the severity of tooth wear in a patient cohort. RESULTS: The results showed that tooth wear has a measurable impact on patients' satisfaction with their appearance, pain levels, oral comfort, general performance, and chewing and eating capacity (P < .001). CONCLUSION: Tooth wear has an impact on patients' satisfaction with their dentition regardless of tooth wear severity or personal factors.

Activities of Daily Living↗
PubMed1999

[Management of an impacted canine tooth in the palate].

The abundance of scientific articles about current dental movements such as intrusion, space closure, uprighting ... is in contrast with the rarity of those concerning palatal impacted canine. The goal of this article is to emphasize upon frequent hazards of this dysmorphosis which often generate litigations and to suggest an original classification of favorable and unfavorable clinical situations and a simplified mechanotherapy.

Cephalometry↗
PubMed1982

Clinical assessment of injuries in orthodontic movement of impacted teeth. I. Methods of attachment.

Recent studies have indicated ankylosis, loss of attachment, and external resorption occurring as sequelae of orthodontic movement of impacted teeth when these teeth are ligated around the cervix with wire. The purpose of this study was to record the effects of two commonly employed methods of attachment to impacted teeth--the wire ligation and the direct bond. Twenty subjects who had previously undergone full-banded orthodontic treatment involving a unilateral impacted maxillary canine were studied. The contralateral non-impacted maxillary canine served as a control. In eight of the subjects the impacted canine was ligated at the cervix with wire at the time of surgical exposure. In the other twelve subjects the impacted tooth also was exposed surgically but then an orthodontic bracket was bonded directly to the tooth approximately 2 weeks after the surgical exposure. The criterion for the diagnosis of ankylosis was failure to move the tooth for at least 3 months. The diagnosis of external resorption was made from radiographs. Loss of periodontal attachment was measured by comparing the level of attachment on the previously impacted tooth with the contralateral canine 3 months after debanding. The results indicated that three of the eight patients in the group receiving wire ligation exhibited external resorption and ankylosis. Also, there was an average of 1.36 mm. greater loss of attachment in all four proximal and lingual probing measurements of teeth ligated with ligature wire but no significant differences in the direct buccal probing measurement.

Adolescent↗
PubMed1996

Attachment bonding to impacted teeth at the time of surgical exposure.

This study examines the relative success of bonding an attachment to an impacted tooth at the time of surgical exposure, compared with placing it on a subsequent occasion. In addition, the relative merits of various attachments, the choice of bonding site and whether or not pumice prophylaxis is necessary, were tested. The results showed that bonding at the time of exposure is superior to its performance at a later date, that the use of an eyelet attachment has a lower failure rate than the use of a conventional bracket, that the palatal aspect offers the poorest bonding surface and that pumicing the exposed tooth offers no advantage over immediate etching of the exposed enamel. The results of this study refute the view that the circumstances prevalent at the time of surgical exposure are not conducive to the reliable bonding of an attachment to an impacted tooth.

Acid Etching, Dental↗
PubMed2003

Root resorption--diagnosis, classification and treatment choices based on stimulation factors.

Etiology of different types of root resorption requires two phases: mechanical or chemical injury to the protective tissues and stimulation by infection or pressure. Injury can be similar in various types of root resorption. The selection of proper treatment is related to the stimulation factors. Intrapulpal infection is the stimulation factor in internal root resorption and external periradicular inflammatory root resorption. Adequate root canal treatment controls intrapulpal bacteria and arrests the resorption process. In cervical root resorption, infection originates from the periodontal sulcus and stimulates the pathological process. As adequate infection control in the sulcus is unlikely, removal of granulation tissue from the resorption lacuna and sealing are necessary for repair. Removal of the stimulation factor, i.e. pressure, is the treatment of choice in root resorption related to pressure during orthodontic treatment, or an impacted tooth or tumor. In ankylotic root resorption, there is no known stimulation factor; thus, no predictable treatment can be suggested. Therefore, various types of root resorptions can be classified according to the stimulation factors: pulpal infection resorption, periodontal infection resorption, orthodontic pressure resorption, impacted tooth or tumor pressure resorption, and ankylotic resorption.

Dental Pulp Diseases↗
PubMed2003

Prevalence of impacted teeth and associated pathologies--a radiographic study of the Hong Kong Chinese population.

OBJECTIVES: To investigate the prevalence and pattern of impacted teeth and associated pathologies in the Hong Kong Chinese population. SETTING: The Reception and Primary Care Clinic, Prince Philip Dental Hospital, Hong Kong. DESIGN: Retrospective study. SUBJECTS AND METHODS: The records of 7486 patients were examined to determine whether the chief complaints were related to impacted teeth and associated pathologies, which were investigated using panoramic radiographs. RESULTS: A total of 2115 (28.3%) patients presented with at least one impacted tooth. Among the 3853 impacted teeth, mandibular third molars were the most common (82.5%), followed by maxillary third molars (15.6%), and maxillary canines (0.8%). Approximately 8% of mandibular second molars associated with impacted third molars had periodontal bone loss of more than 5 mm on their distal surfaces. Caries were also found on the same surfaces in approximately 7% of the second molars. Approximately 30% of patients with dental impaction had symptoms, and 75% had complaints limited to one side of the mouth. CONCLUSIONS: The prevalence of impacted teeth was high, and there was a predilection for impacted third molars in the mandible. More than 50% of maxillary third molars had erupted, creating potential trauma of the pericoronal tissues of the partially erupted mandibular third molars. Caries and periodontal diseases were commonly seen in relation to the impacted third molars, whereas cystic pathology and root resorption were rarely observed.

Adolescent↗
PubMedDate not supplied

The apically repositioned flap in tooth exposure.

Methods of exposing impacted teeth in order to bring them into the line of the arch include gingivectomy, the apically repositioned flap and closed eruption techniques. These procedures aim to facilitate the eruption of the impacted tooth with a minimum of disruption or damage to the tooth itself or adjacent structures. The aim of this paper is to discuss the various surgical methods of exposing impacted teeth and to help to identify where the use of the apically repositioned flap is indicated. Clinical examples are presented and a surgical method for carrying out this procedure recommended.

Humans↗