الفهرس 
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Abstract
Introduction
Cyst is a ”pathological cavity” that contains fluid , semi-fluid , or gaseous contents and does not result from pus accumulation. The cyst may remain asymptomatic for many years. It may become noticeable only after routine dental examination and radiographic investigation or when the lesion becomes infected with a second infection or reaches a size in which swelling or asymmetry is evident. Cysts may be present when teeth are missing and are detected either by intraoral or radiological examination. Cyst enlargement can lead to facial asymmetry, tooth spacing and associated or adjacent tooth loss. In the lower jaw, a pathological fracture can occur as the cyst lesion causes most of the bone to eat, and there is no uniformly agreed treatment for cyst lesions regularly.
The aim of this study was to evaluate the volumetric reduction of cysts after the marsupialization and to investigate if there was any relationship between the patient’s age, the difference in their sex, the location of the cyst, and the initial volume of the cyst with the volumetric shrinkage rate of the cyst.
Our study contains twenty patients, six of them suffer from cyst in the lower jaw, fourteen in the upper jaw, and the size of these cysts is large and close to the vital places of the jaws (nasal cavity, mandibular nerve, etc.), so removing them completely may lead to damage to these areas Vitality or damage to the jawbones and may lead to jaw fractures, which requires us to patch the jaw, and this method of treatment is more intrusive and more dangerous. It requires special medical skills for the surgeon, so we recommend the marsupialization that occurs under the influence of the anesthetic, so we do a work Opening it in this cyst is no less than 1 cm in diameter We can perform the discharge to reduce the pressure inside the cyst, and we sutured between the cyst wall and the oral mucosa so that we keep this hole present without shrinkage, until plug fabrication , then we guide the patient to incite the opening of the opening in order to keep it clean , this requires the patient to be cooperative in order to follow instructions and be careful on follow-up appointments that continue to follow up in our studies until nine months in order to obtain the largest possible contractionincyst.
We use the AutoCAD program to calculate the rate of contraction in volume, and this manual method is more easy, more accurate, and less expensive than other programs, and it is an available and widespread program in engineering transactions, and it was previously used in face and jaw surgery.
Results
In our study we found that all cystic lesions had improved and that their volumetric reduction was more than 74% to 94% months after the marsupialization .
Also in our study, we found that there is no statistical relationship between the patient’s age, gender, and place of lesion with the rate of cyst contraction, but there is an inverse relationship between the initial volume of thecystandtherateofcontractioninthiscyst.
Likewise when measuring the new bone density formed at the contraction, we found that there is a highly statistical change in this density duringthefollow-upperiod(9months).