[Prevalence of dental anxiety in 144 patients with cardiovascular diseases before tooth extraction].

OBJECTIVE: To determine the prevalence of dental anxiety (DA) in patients with cardiovascular diseases before tooth extraction so as to provide psychotherapy. METHODS: 144 patients with cardiovascular diseases were asked to complete a questionnaire modified from Corah Dental Anxiety Scale (DAS) while awaiting for tooth extraction. RESULTS: The incidence rate of DA in these patients was 7.6%. Anxiety level on anesthesia procedure was the highest. DAS score was higher among patients with the following factors: inactive perception, female, below 60 years old, experiences of painful tooth extraction, a documented history of single cardiovascular disease, under ECG monitoring for the first time and complicated tooth extraction. CONCLUSION: DA existed in patients with cardiovascular diseases before tooth extraction and was related to many factors. Medical staff should take necessary measures to provide them with psychotherapy and nursing guidance before tooth extraction.

[A histologic observation of bone formation induced by subperiosteal implantation of resorbable porous block beta-tricalcium phosphate on calvarial surface in rabbits].

OBJECTIVE: By the histologic observation of samples, understanding the osteoconductive histologic behaviour and resorbable mechanism of beta-tricalcium phosphate (beta-TCP). METHODS: Porous block beta-TCP samples were implanted into calvarial surface. Tissue slices dyed with methods of HE and Masson's were observed by microscope and compared with hydroxyapatite(HA). RESULTS: Beta-TCP had the osteoconductivity,as well as HA, plentiful new bone penetrated into materials from the calvarial surface. There was no new bone under the periost obviously. A large number of rhagiorine cells swallowing beta-TCP had been observed. CONCLUSION: Beta-TCP has osteoconductivity, can be used as a substitution for atrophic alveolar ridge augmentation. The function of rhagiorine cell swallowing beta-TCP is the essential resorbable mechanism of beta-TCP.