Incisor Overgrowth – Rabbit - Revision history

Bara at 18:16, 26 July 2012

2012-07-26T18:16:21Z

Bara at 17:17, 23 September 2011

2011-09-23T17:17:34Z

Siobhanbrade: added link to flashcards

2011-09-02T10:26:56Z

added link to flashcards

HelenD at 10:17, 2 August 2011

2011-08-02T10:17:20Z

Bara at 13:48, 6 July 2011

2011-07-06T13:48:43Z

HelenD at 14:18, 5 July 2011

2011-07-05T14:18:18Z

HelenD at 12:15, 5 July 2011

2011-07-05T12:15:17Z

HelenD at 11:56, 5 July 2011

2011-07-05T11:56:44Z

Suzannah.stacey at 17:42, 13 October 2010

2010-10-13T17:42:24Z

Clamy at 17:16, 22 July 2010

2010-07-22T17:16:02Z

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 ==Introduction==
 Rabbit incisors are elodont teeth, i.e. they grow continually. Incisor overgrowth is common in rabbits. It is either primary or secondary depending on the cause.
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 {{review}}
 [[Category:Rabbit Dentition]]
 [[Category:Expert Review - Exotics]]

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 {{Learning
-|flashcards = [[Small Mammals Q&A 02]]
+|flashcards = [[Small Mammals Q&A 02]]<br>[[Veterinary Dentistry Q&A 21]]<br>[[Rabbit Medicine and Surgery Q&A 01]]
 }}
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 [[Category:Rabbit Dentition]]
 [[Category:Expert Review - Exotics]]

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 {{Learning
 |flashcards = [[Small Mammals Q&A 02]]
 }}
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 Gorrel, C (2004) '''Veterinary Dentistry for the General Practitioner''', ''Elsevier Health Sciences''
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 [[Category:Rabbit Dentition]]
 [[Category:Expert Review - Exotics]]

← Older revision		Revision as of 10:17, 2 August 2011
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	'''(Note: Trees that bear single-stoned fruits may have unacceptable amounts of cyanide in the bark so don’t offer peach, plum or cherry, for example.)'''		'''(Note: Trees that bear single-stoned fruits may have unacceptable amounts of cyanide in the bark so don’t offer peach, plum or cherry, for example.)'''
		+
		+	{{Learning
		+	\|flashcards = [[Small Mammals Q&A 02]]
		+	}}

	==References==		==References==

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 ==Introduction==
-Incisor overgrowth is common in rabbits. It is either primary or secondary depending on the cause.<br>
+Rabbit incisors are elodont teeth, i.e. they grow continually. Incisor overgrowth is common in rabbits. It is either primary or secondary depending on the cause.
-'''Primary''' overgrowth occurs early in life as a consequence of inherited skeletal malocclusion (maxillary brachygnathism resulting in a relative mandibular prognathism). <br>
-'''Secondary''' overgrowth usually occurs in rabbits 1 year or older as a result of [[Cheek Teeth Malocclusion – Rabbit|cheek tooth overgrowth]]. This is the most common cause of incisor malocclusion in the rabbit.<br>
+'''Primary''' overgrowth occurs early in life as a consequence of inherited skeletal malocclusion (maxillary brachygnathism resulting in a relative mandibular prognathism, anaesognathism - excessive narrowing of the already narrow mandible). Dental disorders arise as a result of accentuation of the normal configuration - if the mandible is too narrow, molar malocclusion results; if too short, incisor malocclusion results; if both, all teeth are affected.
-Trauma to the teeth or head can also result in incisor pathology.<br>
 Incisors have been shown to grown up to 5mm/week if not in contact, and disease progression can be rapid if no action is taken.
 ==Clinical Signs==
-Signs are similar to those seen with [[Cheek Teeth Malocclusion – Rabbit#Clinical Signs|cheek teeth malocclusion]], including: ptyalism and wet fur around the chin, weight loss, poor hair coat, [[Clagged Vent – Rabbit|clagged vent]], ileus, epiphora and visible overgrowth, twisting, splaying or slant of the incisors.
+Signs are similar to those seen with [[Cheek Teeth Malocclusion – Rabbit#Clinical Signs|cheek teeth malocclusion]], including: '''ptyalism''' and wet fur around the chin, '''weight loss''', poor hair coat, [[Clagged Vent – Rabbit|clagged vent]], ileus, epiphora and visible overgrowth, twisting, splaying or slant of the incisors.
 ==Diagnosis==
 Clinical signs are suggestive of a dental problem, along with a history of anorexia, weight loss and feeding concentrates.
-<br>
-The rabbit should be restrained in sternal recumbency by an assistant and the lips retracted to examine the incisors. <br>
+The rabbit should be restrained in sternal recumbency by an assistant and the lips retracted to examine the incisors.
 Cheek tooth examination should also be performed, as disease processes are usually linked. Sedation is usually a sufficient means of restraint and examination is facilitated by the use of a gag and a cheek pouch dilator.
 ==Treatment==
-It must always be remembered that [[Cheek Teeth Malocclusion – Rabbit#Treatment|treatment of the cheek teeth]] is usually also required.<br>
+It must always be remembered that [[Cheek Teeth Malocclusion – Rabbit#Treatment|treatment of the cheek teeth]] is usually also required.
 Incisors can be '''trimmed''' on a regular basis (every 3-4 weeks) or '''complete extraction''' can be performed.
 ===Incisor trimming===
 This is best done using a '''dental drill''' but good clippers may have to be employed if a drill is not available (this leads to a much higher risk of iatrogenic damage to the teeth).
-#The teeth should be cut horizontally at the estimated desired length
-#The bur can be used to apply a bevel to the incisal edges and to remove sharp edges
+The teeth should be cut horizontally at the estimated desired length. The bur can be used to apply a bevel to the incisal edges and to remove sharp edges. The drill should be used at full speed with light contact pressure, and it should be kept moving on the tooth at all times to prevent excess heat build-up.
-#The drill should be used at full speed with light contact pressure, and it should be kept moving on the tooth at all times to prevent excess heat build-up.
-#Care should be taken with the lower incisors, as their pulp may extend above the gumline when erupting quickly. Trans-illumination should reveal a pink triangle, and the tooth should be trimmed 1mm above that. <br>
+Care should be taken with the lower incisors, as their '''pulp may extend above the gumline''' when erupting quickly. Trans-illumination should reveal a pink triangle, and the tooth should be trimmed 1mm above that.
 Trimming incisors can usually be done without sedation in co-operative rabbits.
 ===Extraction of incisors===
 Indications for incisor extraction:
 *Young animal, who would otherwise need incisor trimming every month for the rest of his life
-*Intractable incisor pathology.
+*Intractable incisor pathology
 *Brachygnathism/Prognathism
-<br>
-'''Procedure''' <br>
+'''Procedure:'''
 All 6 incisors (4 main and 2 upper peg teeth) are extracted.
-#General anasthesia and analgesia is required
-#Radiograph the teeth to assess the extent of dental tissue to be removed and to assess if infection is present at the apex.
+'''General anasthesia''' and analgesia is required. '''Radiograph''' the teeth to assess the extent of dental tissue to be removed and to assess if infection is present at the apex.
-#Start with the lower jaw.
-#Gently cut the subgingival attachment with a #15c scalpel blade.
+Start with the lower jaw. Gently cut the subgingival attachment with a #15c scalpel blade. Gently cut the periodontal membrane with a 20G hypodermic needle bent to suit the socket (hence the  previous radiograph), holding the socket steady. There are special ligament cutters available on the market for this, but they don't suit the curvature of every tooth. Keep cutting the ligament until the tooth is visibly and palpably loose. Concentrate on the inside curvature, the lateral and mesial surfaces of the teeth, as these are where the periodontal ligament is strongest. This takes quite a long time and is most difficult on the lingual/caudal aspect of the tooth. It is a good idea to work from tooth to tooth and back again, loosening several teeth at once.
-#Gently cut the periodontal membrane with a 20G hypodermic needle bent to suit the socket (hence the  previous radiograph), holding the socket steady. Arnolds and Veterinary Instrumentation market a special ligament cutter called the Crossley elevator for this, but it doesn’t suit the curvature of every tooth.
-#Keep cutting the ligament until the tooth is visibly and palpably loose. Concentrate on the inside curvature, the lateral and mesial surfaces of the teeth, as these are where the periodontal ligament is strongest.  This takes quite a long time and is most difficult on the lingual/caudal aspect of the tooth. It is a good idea to work from tooth to tooth and back again, loosening several teeth at once.
+'''Take your time!''' Do not attempt to extract the tooth until it is loose enough or you will break the root and there will be problems with infections or regrowth afterwards.
-#'''Take your time!''' Do not attempt to extract the tooth until it is loose enough or you will break the root and there will be problems with infections or regrowth afterwards.
-#When adequately loosened, push the extracted incisor back into its socket for about ten seconds to traumatise the deep germinal tissue and prevent regrowth.
+When adequately loosened, push the extracted incisor back into its socket for about ten seconds to traumatise the deep germinal tissue and prevent regrowth. Remove the tooth carefully in the curved direction indicated on the radiograph, or follow your observation of the layout of the socket on clinical examination. Use your fingers – not a forceps. Do '''not twist''' the tooth in its socket as you would with a dog's or cat's incisors. You must not risk breaking the tooth.
-#Remove the tooth carefully in the curved direction indicated on the radiograph, or follow your observation of the layout of the socket on clinical examination. Use your fingers – not a forceps. Do '''not''' twist the tooth in its socket as you would with a dog's or cat's incisors. You must not risk breaking the tooth.
-#If you do break the tooth, consider culture and antibiotic sensitivity of the socket. And prepare the client for the fact that the tooth may grow back and the whole procedure will have to be repeated especially as the “new” tooth probably won’t grow in a direction compatible with a comfortable mouth!
+If you do break the tooth, consider culture and antibiotic sensitivity of the socket. And prepare the client for the fact that the tooth may grow back and the whole procedure will have to be repeated especially as the “new” tooth probably won’t grow in a direction compatible with a comfortable mouth!
-#Repeat the procedure with the four maxillary incisors. In spite of their insignificant size, take the same care with the peg tooth as you did with the major incisors.
-#In the event of infection, if you are sure you have removed all the tooth tissue (radiograph to confirm) the socket can be packed with doxycycline (Doxyrobe Gel®; Pharmacia – a lovely product but expensive!).
+Repeat the procedure with the four maxillary incisors. In spite of their insignificant size, take the same care with the peg tooth as you did with the major incisors.
-#Postoperative care includes antibiosis and the provision of strips of vegetables and hay as prehension will now be undertaken solely with the lips.
-#Supportive nutrition may be offered post-operatively by stomach tube if necessary, following the practice post-anaesthetic protocol.
+In the event of infection, if you are sure you have removed all the tooth tissue (radiograph to confirm) the socket can be packed with doxycycline.
-#Follow-up diet should contain fibre as if the incisors were still present except that greens may have to cut in strips. Incisor-less rabbits can cope well with eating.
-<br>
+'''Postoperative care''' includes antibiosis and the provision of strips of vegetables and hay as prehension will now be undertaken solely with the lips. Supportive nutrition may be offered post-operatively by stomach tube if necessary, following the practice post-anaesthetic protocol.
 Any teeth may '''re-grow''' even when removed entire. It is more likely when the pulp is not extracted with the tooth. If the pulp remains in the socket it is best left and a second extraction procedure performed at a later date.
 ==Prevention==
-Provision of '''grass or hay''' (Timothy) and edible branches (apple and pear twigs) will provide adequate abrasion for the normal wear of incisors and cheek teeth. Supplemental foods such as concentrates or muesli-type food should not be necessary. <br>
+Provision of '''grass or hay''' (Timothy) and edible branches (apple and pear twigs) will provide adequate abrasion for the normal wear of incisors and cheek teeth. Supplemental foods such as concentrates or muesli-type food should not be necessary.
 (Note: Trees that bear single-stoned fruits may have unacceptable amounts of cyanide in the bark so don’t offer peach, plum or cherry, for example)
 ==References==
-Crossley, D (2010) '''[http://www.vetdent.eu/cpd/cpd.html Online CPD]''' <br>
+Crossley, D (2010) '''[http://www.vetdent.eu/cpd/cpd.html Dacross Services Online Veterinary CPD]'''
 Gorrel, C (2004) '''Veterinary Dentistry for the General Practitioner''', ''Elsevier Health Sciences''
 [[Category:Rabbit Dentition]]
+[[Category:Expert Review - Exotics]]

@@ Line 1: / Line 1: @@
 ==Introduction==
-Elodont teeth grow continually - rabbit incisors are reported to grow 12.5 cm per year so you can be prepared to saw off one centimetre a month!
+Incisor overgrowth is common in rabbits. It is either primary or secondary depending on the cause.<br>
-Genetic predisposition can occur, including anaesognathism (excessive narrowing of the already narrow mandible) and brachygnathism in rabbits. Dental disorders arise as a result of accentuation of the normal configuration  -  if the mandible is too narrow, molar malocclusion results; if too short, incisor malocclusion results;  if both, all teeth are affected.
+Primary overgrowth occurs early in life as a consequence of inherited skeletal malocclusion (maxillary brachygnathism resulting in a relative mandibular prognathism). <br>
+Secondary overgrowth usually occurs in rabbits 1 year or older as a result of [[Cheek Teeth Malocclusion – Rabbit|cheek tooth overgrowth]]. This is the most common cause of incisor malocclusion in the rabbit.<br>
-Brown (1992) states that there are five causes of incisor malocclusion in rabbits :
+Trauma to the teeth or head can also result in incisor pathology.<br>
-*congenital,
+Incisors have been shown to grown up to 5mm/week if not in contact, and disease progression can be rapid if no action is taken.
-*infection of the roots of the incisor teeth,
 ==Clinical Signs==
 Signs are similar to those seen with [[Cheek Teeth Malocclusion – Rabbit#Clinical Signs|cheek teeth malocclusion]], including:
@@ Line 63: / Line 59: @@
 ==Prevention==
-Provision of grass or hay (Timothy) and edible branches (apple and pear twigs) will provide adequate abrasion for the normal wear of incisors and cheek teeth. Supplemental foods should not be necessary and muesli rabbit foods should be avoided. <br>
+Provision of grass or hay (Timothy) and edible branches (apple and pear twigs) will provide adequate abrasion for the normal wear of incisors and cheek teeth. Supplemental foods such as concentrates or muesli-type food should not be necessary. <br>
 (Note: Trees that bear single-stoned fruits may have unacceptable amounts of cyanide in the bark so don’t offer peach, plum or cherry, for example)
 [[Category:Rabbit Dentition]]
-[[Category:To Do - Helen]]
+[[Category:To Do - Review]]

@@ Line 1: / Line 1: @@
 {{unfinished}}
 Elodont teeth grow continually - rabbit incisors are reported to grow 12.5 cm per year so you can be prepared to saw off one centimetre a month!
 Genetic predisposition can occur, including anaesognathism (excessive narrowing of the already narrow mandible) and brachygnathism in rabbits. Dental disorders arise as a result of accentuation of the normal configuration  -  if the mandible is too narrow, molar malocclusion results; if too short, incisor malocclusion results;  if both, all teeth are affected.
@@ Line 10: / Line 11: @@
 *trauma to the head,  and
 *primary malocclusion of the molars.
 [[Category:Dental Disorders - Rabbit]]