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asbryobvrz · Wysłany: Wto 10:43, 22 Mar 2011

Self-tapping screws from the broken teeth in the repair defect in large clinical application

. 3) the first ball with 0.5ITlm drill drilled in the corresponding parts of the dentin of a pit, select j2j0.70 ~ 0.75mm retention of nails, nail holes with the corresponding depth of 2mm drill drill into the screw channel,[link widoczny dla zalogowanych], and then divisible powder, keep the nails clean and 4) retention screws into the head bent low, pre-drilling nail tip placed above the exit, direction and pin tract consistent with appropriate pressure. Then start slow rotation, the retention pin that has been prepared on their own good larvae L scored,[link widoczny dla zalogowanych], the shoulder and break their own after contact with the tooth surface to show in place to complete. 5) If necessary, use special tools to bend the retention screws, to fit the shape of the final dental restoration. 6) forming tablets by subgingival clamp inserted to make permanent repairs to the crown of silver amalgam, and adjust the occlusion. Early exposure to trauma or to prevent the generation of Guizhou. 3 The results of this set of data by more than 2 years of follow-up confirmed that there l7 cases because of the retention screw loosening or loss restoration failure. 4 Discussion Data reported E incisors crown dentin thickness of the neck is not the same. Coupled with the concave root surface and root bifurcation exists. 114 Jiangxi Medical College Road, nail retention makes the choice of site is especially careful. Authors suggest that recent (or distal) adjacent cheek (tongue) angle most suitable parts of the dentin retention nail nail Road. One because of the ease of the thickest parts of the dentin retention pin retention; two points and may avoid the root cause and root concave side of the retention pin to wear. Cross-section from the crown of view, road nails nail retention in the dentin layer should be selected in the 1 / 3 part, foreign literature also stressed the retention pin retention should be in the dentin,[link widoczny dla zalogowanych], the study confirmed the retention screw weak links, not in silver amalgam retention pins and some, but in the retention pin and dentin interface. Too easily lead to the inside of the retention pin to wear to the side of the pulp cavity is too easy to cause the outer layer of enamel off the destruction. Self-tapping screw-type retainer broken nail is screwed into the screw channel encountered some resistance after the break itself, and its attack in the inner wall of the screw channel corresponding thread, so that the retention pin dentin and closely matched to achieve the best retention, thus making the drill holes with a nail when the screw channel must be the first to achieve the required depth of preparation to avoid repeated up and down the screw channel diameter greater than the diameter of the retention pin. The number of retention pin retention in order to achieve the minimum number of suitable resistance, in general: a cusp requires a retention pin, a marginal ridge of a two retention screws, a maximum of not more than 4 teeth retention screws. The retention of the number of nails too easy to reduce the retention of tooth structure caused by tooth fracture force. From an analysis of 17 cases of failure, due to the retention of secondary caries induced prosthesis screw loosening and loss accounted for 12 cases,[link widoczny dla zalogowanych], it is because: ① not before filling in the permanent elimination of carious dentin; ② disinfection compartment Wet lax; ③ by filling filling material and tooth junction is not pressed; ④ filling powder liquid mixing ratio of materials properly, making the generation gap and food debris intrusion caused by bacteria or absorbed. Another 5 cases of failure and improper placement of the retention pin, resulting in a weak tooth structure and retention pin between the fracture due. In short,[link widoczny dla zalogowanych], most of the defects of the tooth crowns lack of retention, in the filling pressure to bear chewing slide off easily, sometimes beyond repair and to remove, this will inevitably result in the loss of teeth in patients affected by chewing and digestion function, especially premature loss of teeth is six age, may affect growth and development of dental systems 【2]. Using this treatment method, simple, results were satisfactory. 5