ABSTRACT
Intheprocessofmakingsubgingivalcervicalmarginalmatrix,gingivalexcisiononthematrixesmadethebutmentbareatcervi-cal and could help technician trim matrix more easily and directly.By this way subgingival marginal adaptation of the fixed crown can be pro-moted,concurrently increase the success rate of finishing the fixed prosthesis one-off.
ABSTRACT
Objective To observe the effect of all-ceramic crowns and metal ceramic crowns in the application of full denture prosthesis. Methods 86 patients who received full denture prosthesis in the Yunnan Transportation Center Hospital of Yunnan Province from January 2012 to September 2012 were chosen as the research object. According to the order of patients admission tag,patients with the odd tag were as the control group,patients with the even were as the observation group, and 43 patients in each group. Patients in the control group received metal ceramic crown repair, and patients in the observation group received all-ceramic crown repair. Patients in the two groups were followed up for 12 months to 24 months, and the black line on the gingival cervical margin, periodontal damage and porcelain crowns crack were compared between the two groups. Results The cervical margin black line ratios in the observation group and the control group were 2.33%(1/43) and 18.60% (8/43), the difference was statistically significant ( <0.05) . 11.63% (5/43) of patients in the observation group appeared cracks and fracture, compared with the control group of 2.33% (1/43), there was a statistically significant difference ( <0.05) . Conclusion Compared with etal ceramic crowns, all-ceramic crowns in full denture prosthesis have less injury in periodontal tissue and weaker anti-crack intensity, so the clinicians should choose the all-ceramic crowns based on the patients' indications.
ABSTRACT
Objective To evaluate the clinical esthetical effect in the cervical margin of the porcelain fused to metal crown restoration.Methods 225 cases with the porcelain fused to metal crown were observed.The evaluator examined these restorations for cervical color,marginal fit,and gingival state.(Results 53) cases of restoration changed in the cervical color.The method and the tooth preparation volume,the procedure and the material,which were all closely relevant to the cervical color change.(Conclusion Using)the correct method,improving the procedure and choosing the proper material would reduce the cervical color change.