Implant overdenture in the mandible.

Edentulous patients treated with conventional dentures often experience problems as pain during mastication, insufficient stability and retention of the dentures because of impaired load-bearing capacity. These negatives enlarge with the amount of alveolar bone resorption, especially with regard to the characteristics of mandibular denture. Hybrid dentures can successfully solve these problems. The study contained 52 patients, each of them was treated with two implants and tissue borne overdenture. There was not found that the gender plays a role in patient's decision to go through treatment with overdenture supported by dental implants. It was confirmed that patients were more satisfied with implant overdentures comparing with conventional dentures. There is no relation between satisfaction of patients and their gender, age group, type of attachment and type of restoration in the opposite jaw. The age group of patients and the restoration in the opposite jaw will affect the mastication efficiency. This efficiency was not affected by gender, type of attachment and discrepancy in parallelism between the implants in ball attachment restoration. There was no relation between satisfaction and mastication efficiency.Available from STL Prague, CZ / NTK - National Technical LibrarySIGLECZCzech Republi

Post-endodontic treatment using composite resin cement and fiber post

Adhesive post-endodontic treatment does not yet have a generally accepted clinical protocol. We perform this procedure in our clinical practice since 2006. We have developed a clinically successful protocol. Tissues and materials which relate to the the procedure are described following available research. Protocol is described in step-by-step

Two Ways of Immediate Rehabilitation of Edentulous Mandible with Dental Implants and Prostheses – Critical View on Brånemark System® Novum

With appropriate stabilization and occlusal loading, mandibular implants can be immediately loaded in a complete- arch configuration with no apparent detrimental effect on the rates of osseointegration. Ten patients were treated with the immediate loading protocols in completely edentulous mandible either with conventional one-stage implants and a provisional denture or with the Brånemark System® Novum and a definite restoration. A total of 42 implants were placed. One Novum implant was lost 1 month after placement. The clinical success rate of the immediately loaded implants at the time of the 6–month check-up was 97.6 %. Radiographic surveys completed by panoramic radiographs 6 months after the surgery revealed good healing of bone at implant interface. After the period, mean marginal bone loss was 0.4 mm (ranged from 0 mm to 1.5 mm). The results of this short-term clinical and radiographic study indicate that the precise surgical and prosthetic protocol allows successful prosthetic rehabilitation of mandibular edentulism and that the provisional or permanent fixed reconstruction can be provided to a patient on a day of fixture surgery. Finally, authors consider critical comments on Brånemark System® Novum

The marginal fit of E.max Press and E.max CAD lithium disilicate restorations: a critical review

This critical review aimed to assess the vertical marginal gap that was present when E.max lithium disilicate-based restoration (Press and CAD) are fabricated in-vitro. Published articles reporting vertical marginal gap measurements of in-vitro restorations that had been fabricated from E.Max lithium disilicate were sought with an electronic search of MEDLINE (PubMed) and hand search of selected dental journals. The outcomes were reviewed qualitatively. The majority of studies that compared the marginal fit of E.max press and E.max CAD restorations, found that the E.max lithium disilicate restorations fabricated with the press technique had significantly smaller marginal gaps than those fabricated with CAD technique. This research indicates that E.max lithium disilicate restorations fabricated with the press technique have measurably smaller marginal gaps when compared with those fabricated with CAD techniques within in-vitro environments. The marginal gaps achieved by the restorations across all groups were within a clinically acceptable range

Effectiveness of dentin pre-treatment on bond strength of two self-adhesive resin cements compared to an etch-and-rinse system: an in vitro study

Statement of problem It has been shown that selective etching improves the bond strength of some self-adhesive resin cements to enamel. The same has yet to be determined with dentin pre-treatment. Purpose To evaluate the tensile bond strength of two self-adhesive resin cements after two dentin surface pre-treatments, and also to analyze the cement/dentin interface. Material and Methods One hundred and twelve human third molars were extracted. The teeth were distributed into seven groups (n = 16). Maxcem Elite Chroma (MAX) (Kerr, Scafati, Italy) and Relyx U200 (RLX) (3M ESPE, Neuss, Germany) were used without pre-treatment or with two dentin pre-treatments (polyacrylic acid or phosphoric acid). A conventional etch-and-rinse (EAR) luting cement, NX3 Nexus (NX3) (Kerr, Scafati, Italy), was used as an external control group. Before testing, all specimens were stored in distilled water for 24 hours. Three specimens from each group were prepared for scanning electron microscopy observation (SEM). A tensile bond strength test (TBS) was performed for the remaining samples. The data were statistically analyzed using the Kruskal–Wallis test and Pairwise comparisons using the Wilcoxon rank sum test. Results MAX without pre-treatment and with phosphoric acid etching attained statistically similar bond strengths to NX3 (P > 0.05). There was a statistical difference (P = 0.00488) between RLX without pre-treatment (5.62 MPa) and NX3 (10.88 MPa). Phosphoric acid pre-treatment increases the bond strength values of RLX to a strength that is comparable to NX3 (P > 0.05). The lowest tensile bond strength (TBS) was attained after the application of polyacrylic acid with MAX (1.98 MPa). No statistical differences were found between the RLX bond strength values after polyacrylic acid treatment and RLX without pre-treatment or NX3 (P > 0.05). SEM observations disclosed an enhanced potential of the self-adhesive cements to infiltrate into dentin tubules and form resin tags when applied after phosphoric acid pre-treatment. The failure mode was dominantly adhesive. Conclusions On dentin, the self-adhesive resin cement MAX might be an effective alternative to conventional resin cement. Etching the dentin with phosphoric acid does not have a negative effect on the bond strength of MAX to dentin. On the other hand, phosphoric acid improved the bond strength of RLX when compared to EAR cement

The marginal fit of lithium disilicate crowns: Press vs. CAD/CAM

<div><p>Abstract: This study aimed to compare the vertical marginal gap of teeth restored with lithium disilicate crowns fabricated using CAD/CAM or by pressed ceramic approach. Twenty mandibular third molar teeth were collected after surgical extractions and prepared to receive full veneer crowns. Teeth were optically scanned and lithium disilicate blocks were used to fabricate crowns using CAD/CAM technique. Polyvinyl siloxane impressions of the prepared teeth were made and monolithic pressed lithium disilicate crowns were fabricated. The marginal gap was measured using optical microscope at 200× magnification (Keyence VHX-5000, Japan). Statistical analysis was performed using Wilcoxon test. The lithium disilicate pressed crowns had significantly smaller (p = 0.006) marginal gaps (38 ± 12 μm) than the lithium disilicate CAD/CAM crowns (45 ± 12 μm). This research indicates that lithium disilicate crowns fabricated with the press technique have measurably smaller marginal gaps compared with those fabricated with CAD/CAM technique within in vitro environments. The marginal gaps achieved by the crowns across all groups were within a clinically acceptable range.</p></div