[Clinical evaluation of residual crowns and roots restored by glass fiber post and core, cast metal post and core or directly].

OBJECTIVE: To evaluate the survival rate and complications of endodontically treated residual crowns and roots restored directly or by glass fiber post and core or cast metal post and core. METHODS: In this study, 96 patients with a total of 142 teeth were selected. All the teeth were undergone root canal therapy. And then, according to different situations, some of them were restored with glass fiber post and core, another with cast metal post and core, the rest were restored directly in the strict controlled indications. RESULTS: The teeth (135) in 89 patients were divided into three groups. The first group contained 73 (54.1%) teeth restored with glass fiber post and composite resin core. The survival rate reached 97.3% in the average observation period of (5.7 +/- 1.9) years. The second group contained 40 teeth, restored with pure titanium casting post and core. The survival rate reached 87.5% in the average observation period of (6.2 +/- 2.2) years. The last group contained 22 teeth received no treatment. The survival rate reached 90.9% in the average observation period of (5.4 +/- 1.8) years. The success rate had no significant difference among the three groups. The most common complications after restored included root fracture (6.7%), retention loss (2.2%), secondary caries (1.5%) and periapical periodontitis (0.7%). CONCLUSION: Under the premise of high quality root canal treatment and standard restoration treatment, the abutment teeth, whether are restored by glass fiber post and core, cast metal post and core or without post, have a higher survival rate over 5 years of observation period and complications especially root fracture still should attract the necessary attention.

[Scanning electron microscope analysis of the root dentin bonding interface filled with different pastes or bonded by different program in fiber post and resin bonded repair].

OBJECTIVE: To observe the influence of different bonding process and three different root canal sealing materials on microstructure of root canal dentin bonding interface after fiber post and resin bonding, so as to improve clinical operation steps and to optimize fiber post resin bonding effect. METHODS: Fifteen human single mandibular first premolars were selected. Three were bonded with fiber posts through Relyx Unicem conventional bonding steps after filled with root canal sealing materials of zinc oxide eugenol paste (Group A), and another three were bonded through the same steps after filled with sealing materials of Vitapex (Group B). The other nine were filled with sealing materials of AH Plus, randomly divided into three groups and bonded through different steps as follows: conventional bonding steps only (Group C), etching with 35% phosphoric acid before conventional bonding steps (Group D), and etching and coating with Singlebond 2 adhesive before conventional bonding steps (Group E). After immersed in saline solution for one week, all the roots were cut into three sections of 3 mm in thickness with emery chip and numbered as crown section, middle section and tip section respectively. The samples were observed the resin protrusion in mixed layer of dentin interface and dentinal tubules by scanning electron microscopy. RESULTS: We observed the resin protrusion in microstructures of the roots bonded through Relyx Unicem after filled with three different root canal sealing materials (Group A, B, C, E): most obvious in the root crown sections, middle in the root middle sections and least in the root tip sections. Differences were observed in roots filled with different sealing materials: little resin protrusion were observed in crown sections only in Group A and B, but large number of resin protrusion were found in crown and middle sections in Group C-E. Compared with Group C, no more resin protrusion were found in Group D. More and elongated resin protrusions were found in Group E. CONCLUSIONS: We recommend using AH Plus as root canal sealing materials for residual crown and root needed to strengthen by fiber post. It is no need to etch before Relyx Unicem conventional bonding steps. However, coating Singlebond 2 adhesive after acid etching has the potential to increase fiber post cementation.

[Clinical evaluation of casting metal full crown made by Bonn method to restore abutment of removable partial denture].

PURPOSE: To evaluate the effect of casting metal full crown made by Bonn method to restore abutment of removable partial denture. METHODS: The first step was to restore the anatomical shape of 48 abutment residual crowns, then casting metal full crown was made by Bonn method. After the abutment was restored, removable dentures were mounted, and regular clinical examination was performed to evaluate the short-term result. RESULTS: After three to six months, 48 residual teeth were restored successfully by Bonn method, the results were satisfactory, one was found to have gingivitis. CONCLUSIONS: When RPD-based dental crown is used to repair abutment defects, Bonn method is simple and effective.