ABSTRACT
AIMS: The aims of this study were to present a novel method to analyse dentin bond strength and to evaluate the bond strength of combining adhesive systems and resin cement from different manufacturers. METHODS: Human wisdom teeth were ground flat to the dentin on parallel surfaces and axially cut into two parts. Dentin cylinders (Ø 3 mm) were drilled from one half of each tooth. The other half from each tooth was embedded in epoxy resin with the dentin surface exposed. The specimens were ground with silicone carbide paper and the dentin cylinders were cemented onto the dentin surface of the other half of the same tooth.Materials: Resin cement and adhesive systems from three different manufacturers were used in various combinations (n = 8 per group). Cement and adhesive from the same manufacturer served as control. Shear bond strength (SBS) was measured and fracture modes were registered.Results and conclusions: The highest median SBS value was found in a bonding combination between cement and a non-corresponding adhesive (33.1 MPa) and one of the lowest values was found in one of the controls (15.3 MPa). Cohesive fractures were most frequent. The results indicated that combining adhesive and cement from different manufacturers did not compromise the dentin bonding. The novel test method is recommended for evaluating dentin bonding.
ABSTRACT
PURPOSE: Laparoscopic sigmoid colectomy (LSC) is frequently performed for sigmoid diseases with excellent prognosis. We aimed to determine the long-term quality-of-life after open sigmoid colectomy (OSC) compared with LSC. METHODS: Thirty-nine patients were investigated 40.5+/-2.8 months (mean+/-SEM) after LSC. Each LSC patient was matched to a patient after OSC. Patients were interviewed by telephone and the Eypasch quality-of-life questionnaire was answered by mail. RESULTS: LSC entailed fewer minor complications (P=0.0003) and 97% of the patients were satisfied with the cosmetic result, which was more compared with 63% after OSC (P=0.001). Patients suffering from recurrent diverticulitis had a similar quality-of-life index after LSC and OSC (P=0.945). A minor trend was observed in patients with early-staged colorectal neoplasia in favor of LSC (113.6+/-3.3 vs. 106.0+/-4.2; P=0.21, mean+/-SEM). CONCLUSIONS: LSC is superior concerning minor complications and cosmesis, whereas quality-of-life is similar in the long term.
