style=”text-align: justify;”>Veterinary dental nursing procedures
Assignment
For this assignment answer the following questions. Use as much space as you need to adequately answer the questions. You may inset diagrams to illustrate your answers. To answer some questions, you may need to access veterinary dental textbooks or online resources. Remember to reference appropriately (Harvard referencing). Unreferenced assignments will be returned for proper referencing.
You may use this document as a template – open it in Word® and type in your answers, save it to your own computer and then email it to your lecturer
Questions:
1. What are the three main head shapes in dogs?
2. What breeds of cats may have unusually shaped skulls?
3. Define the following terms:
a. Brachygnathism
b. Prognathism
c. Base narrow
d. Periodontal disease versus Caries
4. Draw a tooth and identify on this tooth the location of the following:
a. Crown
b. Root
c. Periodontal ligament
d. Gingival sulcus
e. Neck
5. Write the dental formula for an adult dog.
6. What differences, if any, are there in the dentition of adult cats vs dogs.
Outline any of these differences.
S:BU_PIAL_TeamACM10 Animal Care & ManagementUnits of CompetencyVET410A Carry out veterinary dental nursing
proceduresAssessmentsACMVET410A Assignment 2015.docx
24 July 2015
7. Write out the progression of periodontal disease in dogs – what happens at each step and how does the disease progress
8. Define the terms supragingival and subgingival.
9. List common complaints from clients regarding their pet’s teeth. Why is it important to address the concerns of your client?
10. What information must be collected in the physical examination of the awake animal prior to a dental prophylaxis? Start from when the animal first arrives at the veterinary clinic.
11. Outline the steps in a routine dental prophylaxis. List any recording required and the instruments needed for each step.
12. Describe the routine extraction of a single-rooted tooth.
13. What are possible complications with tooth extractions?
14. What are two methods of naming teeth?
15. What should be recorded on a dental chart? Include an example of record keeping.
16. What maintenance is required for handheld dental instruments?
17. What dietary modifications can be made to reduce the incidence of
periodontal disease?
18. What suggestions could you give a client to successfully brush their dog’s teeth?
19. List the Workplace Health and Safety issues concerning dentals in dogs and cats
20. What measures are put in place to limit the risks associated with dentals for the Veterinary staff?
S:BU_PIAL_TeamACM10 Animal Care & ManagementUnits of CompetencyVET410A Carry out veterinary dental nursing
proceduresAssessmentsACMVET410A Assignment 2015.docx
Navigating clinical oral anatomy imperative to successful oral care
By Brett Beckman, DVM, FAVD, Dipl. AVDC, Dipl. AAPM
Practical knowledge of veterinary dental anatomy and physiology is essential to the veterinarian and veterinary technician involved in providing quality oral care to their patients. Quality surgical skills are only attainable with a thorough understanding of these concepts.
The following discussion provides a basic guide to the veterinary oral anatomy and physiology commonly encountered in practice.
Photo 1: Enamel hypocalcification.
During tooth formation, enamel is derived embryologically from the ameloblasts that lay down matrix that eventually mineralizes into a series of microscopic rods. These rods are arranged in a perpendicular fashion to the dentino-enamel junction and the crown of the tooth. This arrangement becomes important because tooth fractures and defects may leave rods unsupported, predisposing to further fracture and enamel compromise. Any disruption of the production of enamel during the developmental stage can result in defects on the tooth such as enamel hypocalcification (Photo 1). As enamel surrounds the crown of the tooth, cementum covers the root.
Dentin’s role
Photo 2: Dentin exposure can lead to death of odontoblasts.
Dentin is formed from the odontoblast. These cells have processes that run the entire width of the dentin from the pulp to the DEJ within the tubules of dentin that they themselves create. Acute enamel damage can lead to exposure of dentin with resultant death of the odontoblasts creating a direct route of migration for oral microbes to infect the pulp (Photo 2). Restorative treatment is needed to seal the tubules to prevent microbial insult (Photo 3). Chronic enamel wear that extends into dentin may result in gradual repair with the deposition of tertiary or reparative dentin (Photo 4). Many of these chronic lesions need no treatment. It should be mentioned that the tubules within dentin become larger as they get closer to the pulp, therefore the deeper the lesion into dentin, the more likely that pulp changes will ensue.
Photo 3: Above tooth restored.
Photo 4: Chronic enamel wear.
Pulp consists of primarily blood vessels, nerves, fibroblasts, odontoblasts and undifferentiated mesenchymal cells. Pulp can be compromised from trauma or systemic infection (Photo 5).
Photo 5: Pulp escaping a fracture.
Photo 6: Possible pulp necrosis.
Pulp trauma
Pulp necrosis results from irreparable pulp insult from infection and/or trauma. Characteristic changes associated with pulp necrosis radiographically are an enlarged pulp chamber compared to the fellow tooth on the contralateral mandible or maxilla and/or an area of increased lucency surrounding the root apex (Photo 6).
Photo 7: Bone loss from periodontal disease.
Anatomy and physiology of the periodontal tissue is extremely important to the veterinary dental clinician. Periodontal disease is ubiquitous in our patients and represents the majority of cases we see in general practice. The periodontal ligament is a collection of miniscule collagen fibers that attach the cementum to the alveolar bone. Radiographically, the space between the cementum and bone coincides with the region where these fibers reside. A change in the width of this periodontal ligament space around the tooth indicates pathology (Photo 7).
Alveolar process
The bone that surrounds the periodontal ligament space and the tooth is known as the alveolar process. Collectively, it is the cribriform plate (bone lining the tooth socket) known radiographically as the lamina dura, the alveolar margin and the trabecular bone. Radiographic density changes in the various portions of the alveolar process indicate pathology. Periodontal disease, neoplasia, cysts and fractures are examples that may result in changes in alveolar process radiographic density.
Photo 8: Start of periodontal disease.
Photo 9: Gross anatomy.
The alveolar process is covered by periosteum. A region of attached gingiva is tightly adhered to the periosteum and is separated from vestibular mucosa (unattached gingiva) by the mucogingival line or junction. The edge or free margin of the gingiva is termed marginal gingiva (Photo 8). Mobilization of tissue for closure at extraction sites often requires periosteal elevation of the attached gingiva beyond the mucogingival line (Photo 9). The tissue that attaches the gingiva to the tooth is called the junctional epithelium. It rests at the base of the gingival sulcus. A periodontal probe properly placed within the sulcus will come to rest on the junctional epithelium (Photo 10).
Photo 10: Junctional epithelium.
Photo 11: Terms applied to the roots.
Periodontal considerations
Periodontal disease compromises the junctional epithelium and increased probing depths and bleeding upon probing are encountered.
Photo 12
Radiographic or gross pathology is generally described by the location of the pathology in relation to various structures within the oral cavity. Directional terms commonly used to describe pathology in relation to the dental arcades are defined as follows (Photos 11, 12 and 13) :
• Mesial = toward the midline of the dental arch in either mandible or the maxilla,
• Distal = away from the midline of the dental arch,
• Vestibular = (formerly buccal) toward the cheek,
• Lingual = toward the tongue,
• Palatal = toward the palate,
• Labial = toward the lip. This pertains to the canine and incisor region.
• Facial = general term used to indicate either vestibular or labial direction.
Photo 13
Note: Caudal, rostral, lateral, medial, dorsal and ventral are used to describe direction when not associated with the arcades. For example, the “inflammation of caudal buccal mucosa” or a lesion described as “rostral to the lingual frenulum” are proper uses of these terms.
Palatal bone and soft tissue, known collectively as the palate, comprise the majority of the maxillary portion of the oral cavity separating it from the nasal cavity and nasopharynx. The hard palate is comprised of the maxillary, incisive and palatine bones.
The major palatine arteries and the major branch of the maxillary division of the trigeminal nerve supply and innervate the oral portion of the palate.
Photo 14
These structures enter the oral cavity though the major palatine foramina generally present at the level of the central portion of maxillary fourth premolar close to halfway to the palatal midline (Photo 14, p. 7). The major palatine arteries are of great importance when performing palatal surgery from the standpoint of vascular preservation and ligation. Palatine nerve blocks are paramount to intraoperative safety and post-operative patient comfort. The minor palatine foramina lies directly caudal to the major foramina and through them pass the nerve and blood supply to the soft palate.
Photo 15
The paired incisive foramina are present in the rostral hard palate adjacent to the canine teeth. The branches of the major palatine nerve and artery enters the nasal cavity through the incisive foramina.
Palatal mucosa is keratinized and contains numerous rugae or transverse ridges. The line in the mucosa at the midline is called the median raphe (Photo 15). The raised region at the rostral extent of the mucosa at the midline, caudal to the incisors is the incisive papilla. Paired incisive ducts exist lateral to the papilla and communicate directly with the vomeronasal organ. Inflammation of the mucosa of these structures can become a clinical concern when food and debris accumulate abnormally.
Photo 16
The soft palate is the caudal extension of the hard palatal mucosa, contains no rugae and should terminate at the tip of the epiglottis close to the level of the middle of the tonsils. Extension of the soft palate beyond the tip of the epiglottis is an important contributor to respiratory compromise, especially in brachycephalic dogs.
The fauces compose the lateral walls of the oropharynx (Photo 16). Commonly, but incorrectly, referred to as the fauces, the caudal buccal mucosa is the tissue lateral to the soft palate. The tissue lateral to the fauces is correctly referred to as the palatoglossal fold.
Additional oral-cavity structures of clinical interest are the zygomatic and parotid salivary papillae and their associated ducts. Palatal repositioning of the papillae is necessary in most cases to achieve closure of the mucoperiosteal flap following extraction of the maxillary first molar in the dog (Photo 17).
Photo 17
Photo 18
Lateral and ventral to the tongue are the lingual folds. These folds, when excessive, become traumatized during mastication producing sublingual traumatic granulomas otherwise known as “gum chewer’s syndrome” (Photo 18). The tongue is secured to the floor of the oral cavity rostrally by the lingual frenulum.
Photo 19
The lingual frenulum should not be confused with the mandibular labial frenulum (Photo 19), an extension of unattached mucosa vestibular to the mandibular first premolar. This structure may require surgical alteration in cases where its presence is a contributing factor to periodontal disease associated with the mandibular canine teeth.
Maxillary, mandibular landmarks
Several anatomical structures of clinical importance exist in the maxillary and the mandibular bone. Landmarks for the regional nerve blocks of the oral cavity are as follows (Photos 20, 21 and 22):
• Infraorbital block = infraorbital foramen,
• Maxillary block = distal to the maxillary second molar,
• Inferior alveolar block = mandibular foramen,
• Mental block = middle mental foramen.
Photo 20
Photo 21
The infraorbital neurovascular bundle courses in a rostral direction as it exits the infraorbital canal. It can be palpated as a large band beneath the vestibular mucosa. Divisions of the arteries and nerves are found throughout the deeper tissue of the upper lip and must be avoided when preparing mucoperiosteal flaps for extractions and oronasal fistula repair.
Foramina
Photo 22
Although not as prominent as the infraorbital structures, the nerves and arteries emanating from the caudal, middle and rostral mental foramina should be avoided or ligated if surgical exposure is required in the soft-tissue region of the rostral mandible.
As a note of clarity, the proper nomenclature describing the horizontal portion of the mandible is the mandibular body. There is no horizontal ramus. The vertical portion of the mandible is the ramus. There is no vertical ramus.
TMJ
Photo 23
The temporomandibular joint (TMJ) is formed by the condylar process of the mandible and the mandibular fossa of the temporal bone (Photo 23). Abnormalities in this area can result in pain, crepitance and the inability to close or open the mouth. Traumatic dislocations are common, especially in the cat. Radiographic positioning is tedious for this region, and CT imaging is becoming the technique of choice for more involved cases (Photo 24).
Photo 24
The muscles of mastication include the muscles that open and close the mouth. Those that close the mouth are the strongest and most numerous for obvious reasons and include the temporalis, masseter and lateral and medial pterygoid. The digasticus muscle is the muscle that acts to open the mouth. A commonly recognized problem associated with the muscles of mastication is masticatory muscle myositis that results in acute pain and eventual inability to open the mouth due to chronic inflammation and fibrosis.
Recognition of the major anatomical structures within the oral cavity gives the veterinarian and technician a comfortable base for making medical and surgical decisions that benefit the patient. The veterinary dental knowledge base has expanded dramatically in the recent past. This review has provided updates with current and accepted nomenclature and has provided some clinical syndromes commonly associated with that anatomy.
Brett Beckman
Dr. Beckman, diplomate of the American Veterinary Dental College, owns and operates South Florida Veterinary Dental Service in Punta Gorda, Fla.
