This study was performed to investigate the effect of temporary sealing with cement on the tensile bond strength of resin luting cement to tooth substrate. Five temporary cements and five resin luting cements were used.Six hundred bovine incisor teeth were randomly divided between each group. Effect of temporary sealing on the tensile bond strength of resin luting cement varied in accordance with the temporary cement used.Temporary sealing with both the eugenol-containing and the eugenol-free temporary cements decreased the tensile bond strength of resin luting cement. The tensile bond strength with one of the resin luting cements was most stable on both enamel and dentin pretreated with all temporary cements tested.
The reattachment of the crown fragment to a fractured tooth is a conservative treatment that should be considered for patients with crown fractures of anterior teeth. This case report describes the reattachment of crown fragment that is discolored because of dehydration. After 1 month, the fragment had regained some of the original color and translucency. After 1 year, the reattached fragment had satisfying esthetics and excellent function. The reattachment of the crown fragment should be done even if the crown fragment is discolored.
We investigated the effect of resinous temporary material on the tensile bond strength of resin luting cement to enamel and to dentin. Four hundred bovine incisor teeth were randomly divided into groups. Four resinous temporary materials and four resin luting cements were used. On enamel, none of the resinous temporary materials decreased the tensile bond strength of the cements. On dentin, all the resinous temporary materials decreased the tensile bond strength of the cements except one containing 4-META/MMA-TBB.
Enamel and dentin surfaces of bovine teeth were characterized after mechanical and chemical removal of temporary cements. The surfaces were examined by scanning electron microscopy and X-ray microanalysis. Contact angles of distilled water were measured to monitor surface wettability. Mechanical removal with a dental probe did not completely remove all of the temporary cement from both enamel and dentin surfaces.These surfaces usually produced contact angles of distilled water greater than that on polished surfaces. Etching with thirty-seven percent phosphoric acid effectively removed the temporary cement that remained on enamel surfaces after mechanical removal but the etchant was not effective on dentin surfaces. Acid etching aftar mechanical removal of cement significantly decreased the contact angles of distilled water on enamel surfaces but the etchant only slightly improved contact angles of distilled water on dentin surfaces.
When a root fracture is located very close to the gingiva, the chance of healing with calcified tissue is poorest. Therefore, a preferable treatment is usually thought to be the removal of the coronal fragment and subsequent orthodontic or surgical extrusion of remaining apical fragment. This case report describes conservative treatment for root fracture located very close to the gingiva. The treatment of root fracture was by repositioning and fixation. A 7-years follow-up showed healing with calcified tissue and pulp canal obliteration.
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