I. Introduction
The role of provisional restoration (PR) is to maintain occlusion and aesthetics. In some cases, root canal treatment (RCT) may become difficult due to setting PR. The reinfection occur by leakage of saliva into root canal due to detachment or breakage of PR. A postcrown type PR occupy a part of work space of RCT. In addition, a wedge effect of post may cause a root fracture. To avoid reinfection with rubber-dam and to shift smoothly from endodontic treatment to prosthodontic treatment, we propose a matrix for prevention of leakage, improving retentive force of PR and reinforcement of the remaining tooth structure. Furthermore, this matrix can be utilized as a part in a two-step core buildup system after RCT.
II. Methods
The infected dental hard tissues were removed from an abutment tooth. Subsequently, dowel preparation and impression were carried out. The matrix was formed with a composite resin based on a technique for an indirect resin core buildup method. In addition, an access-hole for RCT was prepared to embed a wood stick or a gutta-percha point in the resin core. At cementing, the hole was filled with an impression material to avoid inflow of the cement into the hole. After tooth preparation, the PR was set on the abutment tooth. Following rubber dam application, RCT was carried out according to common method, through the accesshole. Finally, a fiber-post was inserted and cemented to the access-hole via indirect two-step core buildup method.
III. Results
Through our method, various complications, such as reinfection, detachment of PR and root fracture that may occur during RCT could be avoided. Furthermore, we were able to shift smoothly from endodontic treatment to prosthodontics treatment. On the other hand, narrowing of visual field and limited direction in approach to the root canal with endodontic tools were detected as disadvantages in using our matrix.
IV. Conclusion
The matrix that we introduced was useful for endodontic and prosthodontics treatment. However, we should resolve some endodontic problems, such as the ones mentioned above.
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