Life threatening hemorrhage associated with a dentigerous cyst in a dog: Case report.

Dentigerous cysts are the most common type of odontogenic cysts and arise from an unerupted tooth. These cysts have stereotypical radiographic and clinical findings. They can be extremely invasive but rarely present as a life-threatening emergency. This case report describes the stabilization and treatment of a 6-year-old mixed breed dog with a dentigerous cyst with concurrent life-threatening hemorrhage. The dog presented with severe oral hemorrhage from the mandibular artery and required multiple blood transfusions. It was ultimately diagnosed with a dentigerous cyst. Complications from dental issues and potential life-threatening complications, such as this case, can be prevented by routine annual oral examination and full mouth dental radiographs if an unerupted tooth is suspected.

Correlation Between Radiographic and Histopathologic Findings Associated with Unerupted Teeth in Dogs.

An association between unerupted teeth and dentigerous cysts is well known,1- 4 however little is known about the presence of disease and histopathologic changes in unerupted teeth without radiographic evidence of cyst formation. Forty-two dogs representing 25 breeds, ranging in age from 5 months to 12 years were selected based on radiographic evidence of an unerupted tooth or teeth, either as a primary complaint or incidental finding. Dogs meeting the study criteria were presented to a private dental referral practice within a period of eighteen months from December 2016 through May 2018. Patients were treated with conservative en bloc resection of the unerupted tooth and overlying bone as well as debridement of any cystic structure and biopsy of the samples collected. Radiographs were evaluated using criteria previously established to assess for evidence of a cyst.1, 5- 7 A total of 68 unerupted teeth were identified; 63 (92.7%) were mandibular first premolar teeth. Of the 63 unerupted mandibular first premolar teeth, 28 (44.4%) had radiographic evidence of a cystic structure. Histopathology revealed that 21 of 28 (75.0%) had evidence of non-keratinizing stratified squamous epithelium consistent with a cyst lining. Of the remaining 35 of 63 (55.6%) mandibular first premolar teeth with no radiographic evidence of a cyst, 27 (77.1%) had no histologic evidence of epithelium associated with the impacted tooth. Notably however, the remaining 8 of 35 (22.9%) unerupted teeth without radiographic evidence of a cyst did have histologic evidence of non-keratinizing stratified squamous epithelium associated with the impacted tooth.

Unerupted Supernumerary Mandibular Fourth Premolar in a dog.

A 2.5-year-old intact male Irish setter was presented for a draining tract associated with the right mandibular first molar tooth (409). Conscious oral examination yielded two draining tracts associated with the right mandibular first molar tooth. No obvious missing teeth or other gross abnormalities associated with the oral cavity were observed. Upon anesthetized radiographic evaluation, the presence of an unerupted, abnormally positioned, supernumerary premolar tooth was observed. The following article describes the extraction of the right mandibular first molar tooth (409) as well as the unerupted supernumerary premolar tooth with associated supernumerary root and the diagnostic approach taken for this uncommon abnormality.

Incidence of Radiographic Cystic Lesions Associated With Unerupted Teeth in Dogs.

Medical records and radiographs were retrospectively reviewed over a 3-year period (2012-2015) from dogs presented to a private dental referral practice. Medical records were evaluated for the diagnosis of impacted or embedded teeth. The identified dogs' radiographs were reviewed for the presence of radiographically significant cystic lesions that were associated with the impacted or embedded teeth. Radiographic criteria were established by the authors for the purposes of identifying cystic lesions in dogs of different breeds and sizes, using established indices from human dental pathology as a basis. When histopathology results were available, they were reviewed and reported. In this study, 136 dogs ranging in age from 3 months to 17 years were diagnosed with 213 unerupted teeth during the study period. There were 62 (29.1%) of the 213 radiographically apparent cystic lesions identified based on the criteria proposed in this study. In this study, 146 (68.5%) of the 213 unerupted teeth were identified as mandibular first premolar teeth. Histopathology was obtained on 28 (45.1%) of the 62 diagnosed cystic lesions. Dentigerous cysts accounted for 20 (71.4%) of the 28 cystic lesions. Brachycephalic breeds were overrepresented in this study. Boxer, pug, Shih Tzu, and Boston terrier dogs were most likely to present with cystic lesions associated with unerupted teeth. Seventeen (85%) of the 20 cases with a histopathologic diagnosis of dentigerous cyst were found within these 4 brachycephalic breeds.

Removal of 11 incompletely erupted, impacted cheek teeth in 10 horses using a dental alveolar transcortical osteotomy and buccotomy approach.

OBJECTIVE: To describe surgical technique and outcome in 10 horses with impacted cheek teeth that were removed by a transcortical osteotomy and buccotomy technique. STUDY DESIGN: Case series. ANIMALS: Horses (n=10) with impacted cheek teeth. METHODS: Medical records (2002-2008) of horses with impacted cheek teeth requiring removal were reviewed; surgical technique and outcome were determined. RESULTS: Exodontia of 11 cheek teeth was performed surgically in 10 horses; 3 horses had complications (residual swelling of the mandible) that resolved and all horses returned to their previous use. CONCLUSIONS: Transcortical buccotomy technique is effective for removal of incompletely erupted impacted cheek teeth in horses and has a good long-term prognosis for remission of clinical signs. CLINICAL RELEVANCE: Transcortical buccotomy approach is an effective technique for removal of unerupted impacted equine cheek teeth.

Dental corrective procedures.

This article explains what is needed for successful extraction of diseased cheek teeth and how to realign the occlusal surface. Incisor teeth procedures and correcting abnormalities of cheek tooth crown wear are also discussed along with wolf and floating teeth.

Multiple dental developmental abnormalities following canine distemper infection.

Multiple dental developmental abnormalities (e.g., dental impaction, partial eruption, oligodontia, enamel hypoplasia, and dentin hypoplasia) in a 10-month-old, female, Tanzanian tropical mixed-breed puppy are reported. Various permanent teeth were involved. These included impacted mandibular canine and first and third premolar teeth; a partially erupted maxillary canine tooth; oligodontia of a mandibular fourth premolar tooth; enamel hypoplasia of the maxillary and mandibular canine teeth, incisors, and premolars; and dentin hypoplasia of the maxillary incisors, maxillary premolars, and mandibular premolars. The puppy had clinical canine distemper at the age of two months and had no history of any other systemic nor generalized infection prior to the time when the dental abnormalities were observed.

Odontogenic cysts of the anterior mandible of sheep.

Cysts of this site are quite common in mature ewes in New Zealand and the British Isles, although their true prevalence is not yet known. In most examples, an unerupted incisor is embedded in their wall but some do not contain a tooth. The cysts are lined by parakeratinized stratified squamous epithelium and generally exhibit a flat interface between the epithelium and the connective tissue. They may become secondarily infected, in which case they exhibit chronic inflammation. In some cases, foci of cementum are attached to the epithelial lining. When a tooth is involved, the cysts arise from various locations along its crown, which in sheep is normally covered by a thin layer of cementum. Some of these unerupted teeth exhibit irregular hypercementosis and/or external resorption which is repaired by cementum. In some examples there is a fistula between the cyst and the oral cavity, either through a deep periodontal pocket or from the incisal edge of the unerupted tooth piercing the overlying mucosa.