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yxfbbiedtj · Wysłany: Pon 16:15, 14 Mar 2011

Polycarbonate crown restoration of front teeth, premolars failure analysis (report of 50 cases)

Contact. 1.2 abutment inadequate conditions: length or width of the abutment crown inadequate, such as root, residual crown is too small teeth, improper preparation of abutment teeth. Therefore, the time needed to repair or home-made with stainless steel wire screw post for support, then the base dental composite resin post and core was prepared to meet the increasing restoration of the resistance and retention purposes. 1.3 The choice of adhesive materials: polycarbonate crown restoration with adhesive materials, the success of a certain relationship. I had to do this in 2 cases of early crown glass ionomer cement for trial direct crown restorations. Although it has good shaping, the advantages of short operation time. But soon (about 15 days after the repair) prosthesis loosening due to lack of bonding strength, shedding. Currently, the highest self-curing plastic is polycarbonate better crown restorations. Because of the crown is the main component of polycarbonate polycarbonate, it is compatible with self-curing resin monomers from methyl alcohol-based solution, aminolysis reactions, so the polycarbonate crown and the self-curing acrylic plastic in the methyl acid methyl esters have a certain affinity. Hereby, self-curing plastic called polycarbonate crown the best bonding materials. 1.4 Model selection polycarbonate crown too: between the abutment and the prosthesis with the lack of retention of the principle that the main factors - friction. Adhesion of bonding material alone makes poor retention prosthesis, axial rotation,[link widoczny dla zalogowanych], fall off. 2, abutment fracture: Improper use of 2.1 patients: biting hard objects such as the ability to make big bite tired shear force r prosthesis to the abutment teeth broken off restoration. Therefore, instruct patient after the repair dental prosthesis so as not to bite on the excellent food. Otherwise it will affect the restoration of the strength and fastness. 2.2 abutment lip over the Tilt: To comply with the aesthetic requirements, tooth preparation on the abutment lips and tongue surface caused excessive wear to the tune insufficient thickness, so that functional movement in the exercise of the abutment due to lack of fracture resistance. To prevent this failure,[link widoczny dla zalogowanych], according to need to use screws made of stainless steel wire frame stakes or to increase the resistance. 3 Color: 3.1 deep color of teeth: dental pulp, such as death, after falling off after repeated resin filling was dark black color crown. The crown itself is translucent polycarbonate performance. Can not rely solely on self-curing the black plastic covering the tooth surface. I met these teeth, the teeth of the lip before the first bonding surface (especially in the neck) opaque light cured lining materials,[link widoczny dla zalogowanych], and achieved satisfactory results. 3.2 Wet strictly separated: such as chronic gingivitis. Before Dentistry June 1998 (Vol 18 Issue 2) tooth cutting angle and other defects were filled again, the nipple a little gingival swelling,[link widoczny dla zalogowanych], gingival crevicular secretions more, and sometimes there are the bloody effusion, the bonding time as bleeding is not complete, repeat the wet tooth surface contamination can cause incomplete filling brown purple lips appear before plaque deposition, discoloration. To avoid this failure, the author strictly indications, patients with chronic gingivitis and periodontal treatment should be made after dental repair, teeth grinding adjustment should be prepared to protect the gingival margin, gingival papilla to prevent bleeding. 3.3 The bonding material issues: such as self-curing resin polymerization induced polymerization shrinkage, which simulate the actual income was 0.43% linear shrinkage, marginal leakage of restorations is to produce the main reason for non-ferrous materials along the food is not dense in co-deposition was linear at the entire tooth surface discoloration or discoloration, although the polycarbonate crown itself does not have the color performance, but because of the inadequacies of bonding materials led to the slow restoration coloring. 4 Iatrogenic: Polycarbonate Crown rupture: such as deep cover tired, tired bite patients, after repair or adjustment without careful adjustment tired tired properly,[link widoczny dla zalogowanych], causing the tongue or the cutting edge of polycarbonate crown worn, the cutting edge of a long break cracked, loose. The reasons for failure as long as each operation carefully preserved dental clinicians a complete polycarbonate crown can be avoided. In short, the polycarbonate and treatment of dental crown in effect is achieved satisfactory, but failed, after all, is a minority (3.6% in our department). There are many reasons for failure, resulting in failure of interaction by a variety of reasons the results. I do not talk about the following points as reasons for the failure of polycarbonate crown, but in the polycarbonate crown bonding process can not be ignored. 1 PCS carbonate buccal crown lip gloss and should maintain the original shape. Single or redundant to avoid self-curing plastic contact, to prevent the crown of the surface rough and dull appearance. 2 abutment adjacent to the lips, tongue shape along the neck to make a margin of about 0.3 ~ 0.5mm wide ring shoulder, polycarbonate inner edge of the neck to make a crown of about 45. Cannot. When the surgeon is available in the bonding fingers gently press polycarbonate crown margin, to be let go after polymerization of bonding material, so that restoration neck seal edge and the abutment teeth and gums gently touch, so that bonding material in the aggregate exist in the process allows the leakage of the sulcus exudate contaminated tooth surface. 3 bonding, the crown volume of adhesive material to be appropriate. If a small amount of adhesive material neck edge spillover before polymerization of bonding material should be gently removed with a probe, intact, clean neck edge line. Overhanging avoid resin to stimulate gums to prevent gingivitis and caries.