Ulus Travma Acil Cerrahi Derg. 2006; 12(1): 9-16

An ultrastructural study on indirect trauma of dental pulp caused by maxillofacial impact injury in dogs

Changqun REN, Ruifeng LIU, Lei TIAN, Peng CHEN, Shuxia ZHOU
Department of Oral and Maxillofacial Surgery, College of Stomatology, Fourth Military Medical University, Xi’an, PR China

BACKGROUND
Indirect injuries of adjacent tissues and organs usually accompany maxillofacial impact injuries. However, studies on indirect dental pulp injury are rare. This study was designed to determine the characteristics of indirect dental pulp injury caused by impact injury of mandible in dogs.
METHODS
Eighteen dogs were divided equally into six groups with random allocation. Right mandible of each dog was impacted but teeth were not injured directly. Then, the animals were killed at appointed time points and ultrastructural changes in dental pulp of assigned teeth of each dog were investigated with transmission electron microscope.
RESULTS
Dental pulp of the fourth premolar of right mandible was injured very severely, but irreversible necrosis did not occur in the end. Dental pulp of the second premolar of right mandible was injured less severely and reversibly. Dental pulp of the second premolar of left mandible was injured mildly and temporarily.
CONCLUSION
In the indirect injury of dental pulp caused by maxillofacial impact injury, the injured area is relatively extensive. The effect of the trauma decreases progressively and sharply as the distance to the impact site increases. Ultrastructural changes in the damaged nerves take place early.

Keywords: Animal experimentation; dental pulp/blood supply/physiopathology; dogs; impact injury; mandibular fractures; maxillary fractures; microscopy, electron, transmission; pressure; ultrastructure.

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Köpeklerde maksillofasiyal çarpma sonucu diþ pulpasýnda geliþen dolaylý yaralanma üzerine ultrastrüktürel bir çalýþma

Changqun REN, Ruifeng LIU, Lei TIAN, Peng CHEN, Shuxia ZHOU
Department of Oral and Maxillofacial Surgery, College of Stomatology, Fourth Military Medical University, Xi’an, PR China

AMAÇ
Maksillofasiyal çarpma yaralanmalarý sonucunda genellikle komþu doku ve organlar da dolaylý olarak yaralanýrlar. Ancak, diþ pulpasýnýn dolaylý yaralanmasý konusunda fazla çalýþma yoktur. Çalýþmamýzda köpeklerin mandibulalarýnda çarpma sonucu diþ pulpasýnda dolaylý olarak geliþen yaralanmanýn özelliklerini belirlemeyi amaçladýk.
GEREÇ VE YÖNTEM
On sekiz köpek rastlantýsal olarak altý eþit gruba ayýrýldý. Her köpeðin sað mandibulasýna çarpma travmasý uygulandý. Ancak, diþler doðrudan yaralanmadý. Hayvanlar belirli zamanlarda öldürüldü ve her bir köpeðin diþ pulpasýndaki ultrastrüktürel deðiþiklikler transmisyon elektron mikroskobu kullaný larak incelendi.
BULGULAR
Sað mandibuladaki dördüncü premolar diþin pulpasý aðýr bir þekilde yaralanmýþtý, fakat sonuçta geri dönüþümsüz bir nekroz oluþmadý. Sað mandibuladaki ikinci premolar diþin pulpasý ndaki yaralanma daha az aðýrdý ve geri dönüþümlüydü. Sol mandibuladaki ikinci premolar diþin pulpasý ise hafif ve geçici bir þekilde yaralandý.
SONUÇ
Çarpma þeklindeki maksillofasiyal yaralanmalar diþ pulpasýnýn dolaylý olarak yaralanmasý açýsýndan incelendiðinde, oldukça geniþ bir alanýn yaralandýðý görülür. Travmanýn etkisi çarpma sahasýndan uzaklaþýldýkça giderek ve hýzla azalýr. Sinir hasarýna ait ultrastrüktürel deðiþiklikler erken dönemde oluþur.

Anahtar Kelimeler: Hayvan deneyi; diþ pulpasý/kan desteði/fizyopatoloji; köpek; çarpma yaralanmasý; mandibula kýrýðý; maksilla kýrýðý; elektron mikroskobu; basýnç; madde, en küçük parça yapýsý.

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