ABSTRACT
Objective Coralline hydroxyapatite (CHA),in comparison with Bio-Oss bone meal,is a material with extensive resources but no immunogenicity or risk of disease-transmission. The aim of this article was to study the clinical application of CHA in ridge preservation in the maxillary anterior zone. Methods Twenty-six patients underwent extraction of maxillary anterior teeth (n=26) for chronic periodontitis or periapical periodontitis. The patients were randomly assigned into a CHA and a control group of equal number to receive ridge preservation with CHA and Bio-Oss bone meal respectively. Cone beam computed tomography (CBCT) was performed immediately and at 4 months after ridge preservation to compare the vertical and horizontal alterations of the alveolar ridge be-tween the two groups of patients. Results After ridge preservation,both the CHA and control groups showed a reduction in the width ([1.1±0.7] vs [1.3±1.9] mm) and height of the alveolar ridge ([1.3±1.6] vs [1.2±1.4] mm),but with no statistically significant differences between the two groups (P<0.05). Conclusion For ridge preservation in the maxillary anterior zone,CHA has a similar effect to that of Bio-Oss bone meal and therefore is an ideal material for bone graft.
ABSTRACT
Objective To evaluate the effect of digital subtraction angiography and transcatheter embolization for gastrointestinal hemorrhage.Methods Twenty patients with gastrointestinal hemorrhage received celiac arteries,superior mesenteric arteries and inferior mesenteric arteries angiography. Superselective angiography were performed when the arteries were suspicious by clinic or angiogrraphy.Ten patients with definite diagnosis and manifestation of hemorrhagic arteries by angiography were embolized after superseleetive catheterization with gelfoam particles,gelfoam particles and coils,polyvinyl alcohol particles. Results The positive signs were observed in 13 cases.The DSA features including contrast medium accumulation in the gastrointestinal tract outside vascular,aneurysm,tumorous vascularization and staining, artery affect and local vasospasm.The bleedings were stopped immediately in 8 patients.No rebleeding and intestinal ischaemia or necrosis were observed in 30 days.One patient died in the second day after embolization from multiple organ failure.Rebleeding occurred 3 days after embolization in another patient, and was recovered after surgical operation.Conclusion DSA is more effective for the diagnosis of gastrointestinal vascular malformation and tumors complicating acute bleeding.Transcatheter embolization is effective and safe to control the hemorrhage.