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At least 235 records · Page 13Linked to original sources

Tooth eruption and migration theories: can they account for the presence of a 13,000-year-old mesiodens in the vault of the palate?

A case of a mesiodens in the vault of the palate of a skull estimated to be approximately 13,000 years old is presented. The currently cited theories of tooth eruption were considered, and it was concluded that only the newly formulated BVT (blood vessel thrust) theory of tooth eruption can account for the migration of this mesiodens into that position.

Alveolar Process↗

Rescue of a "hopeless" second premolar.

We present a case of a young male who was referred to our clinic because of a deep caries on the first lower left molar. The patient refused conservative treatment, and the caries progressed. After 2 years the first lower left molar had to be extracted. During standard x-ray procedures, a deeply impacted second lower left premolar was diagnosed. The boy was followed by our staff, and surgery was performed at proper time to enable eruption of the second lower left premolar. Orthodontic treatment allowed us to bring the element in a suitable position to place a provisional Maryland bridge. At a later stage the missing element (first lower left molar) will be replaced by an osteointegrated implant.

Bicuspid↗

Maxillary canine-lateral incisor transposition--orthodontic management.

A case of maxillary canine-lateral incisor complete transposition is presented. Treatment options for transposed teeth, including alignment in their transposed positions, extraction of one or both transposed teeth, and orthodontic alignment to their normal positions in the arch, are discussed. The orthodontic technique and sequence used in this challenging case to align the fully transposed teeth to their normal position in the dental arch are described.

Child↗

Unusual intraosseous transmigration of a palatally impacted canine.

Intraosseous migration of impacted teeth across the midline to the opposite side of the jaw is a rare dental anomaly of unknown etiology. Transmigration of an impacted mandibular canine through the symphysis to the contralateral side of the arch has been documented. Transmigration of an impacted maxillary canine across the midpalatal suture to the opposite side of the maxilla has not been previously observed and is reported here for the first time.

Adolescent↗

Three-dimensional localization of maxillary canines with cone-beam computed tomography.

INTRODUCTION: Precise 3-dimensional (3D) localization of impacted canines is central to their clinical management. Recently introduced dental 3D volumetric imaging systems make precise localization possible. The purpose of this study was to describe the spatial relationship of impacted canines by using images obtained with the NewTom QR-DVT 9000 (QR Srl, Verona, Italy). METHODS: Unilaterally and bilaterally impacted canines (n = 27) from 19 consecutive patients (15 female, 4 male) were evaluated on images taken with the NewTom QR-DVT 9000. The spatial relationships of the impacted canines relative to adjacent structures and incisor resorption were assessed with 3D visualization software. RESULTS: Most (92.6%) of the 27 impactions were palatal. Incisor resorption adjacent to the impacted canine was present in 66.7% of the lateral incisors and 11.1% of the central incisors. Follicle size did not play a major role in influencing impacted canine position. The alveolus was narrower at the impacted canine side compared with the erupted canine side; however, the width of the alveolus on the impacted canine side is independent of the deciduous canines. A correlation was found between the proximity of the impacted canine to the incisors and their resorption. There was no common location where eruption was arrested, and great variation in the inclination of the impacted canine was found. CONCLUSIONS: 3D volumetric imaging of impacted canines can show the following: presence or absence of the canine, size of the follicle, inclination of the long axis of the tooth, relative buccal and palatal positions, amount of the bone covering the tooth, 3D proximity and resorption of roots of adjacent teeth, condition of adjacent teeth, local anatomic considerations, and overall stage of dental development. In short, 3D imaging is clearly advantageous in the management of impacted canines.

Adolescent↗

Correction of a mandibular lateral incisor-canine transposition.

Early diagnosis of a transposition can simplify the orthodontic correction. In this report, we describe the orthodontic management of a patient with mandibular right lateral incisor and canine transposition. Nonextraction therapy was performed with removable multibracket appliances. Natural tooth order was attained, and a symmetric and functional Class I occlusion was achieved.

Child↗

Treatment of a unilateral Class II crossbite malocclusion with traumatic loss of a maxillary central incisor and a lateral incisor.

This case report describes the multidisciplinary management of an adolescent girl with traumatic loss of the maxillary right central lateral incisors, and a unilateral Class II crossbite malocclusion. A rapid palatal expansion appliance was used initially to correct the transverse deficiency and secondarily as an anchorage unit for unilateral molar distalization to correct the Class II molar relationship. Temporary incisors were extended from a Nance stabilizing appliance during premolar and canine retraction. A staged approach was used with bone grafting before the placement of 2 single-tooth implants. A favorable outcome was achieved through proper coordination among the orthodontist, the surgeon, and the restorative dentist.

Adolescent↗