Biomedical subjects
J R Strub
Publications and source records attributed to J R Strub.
[Long-term clinical study with endosseous implants. 1. Surgical advances (I)].
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[Long-term clinical study with endosseous implants. 1. Surgical measures (II)].
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[Long-term clinical study with endosseous implants. 2. Crown and bridge procedures].
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Effect of controlled oral hygiene procedures in patients with fixed prostheses.
The purpose of this study was to determine the effect of frequent recall appointments for a professional oral prophylaxis, specificaly for patients with fixed prostheses. By a dental hygienist the prophylaxis was repeated every month for a test group and twice a year for a control group (24 subjects). All patients were reexamined at 6- and 12-month intervals to reevaluate the oral health. This study demonstrated that careful professional cleaning of the teeth of patiens with fixed prostheses once every month is sufficient to maintain satisfactory oral hygiene. For the private practitioner it hardly seems realistic to organize a recall program once every month. However, professional clearning twice a year cannot guarantee oral health in all patients with fixed prostheses. Therefore further examinations over a longer period of time are necessary to determine reasonable recall intervals for the successful establishment and maintenance of oral health.
[Testing of the shaping effect with 3 different instruments for gold cast fillings].
27 extracted human teeth were restored with cast gold overlays. During the cementation they were brunished with different finishing instruments: white-stone, Shofustone (composite finishing kit) and tungsten-carbide-finisher. The specimens were analysed with a light microscope and a scanning electron microscope. Most of the groups gave positive results. In the light microscope the white-stone showed the best, the Shofustone the second best and the tungsten-carbide-finisher the worst results.
[Trial of the sealing capacity of 3 attachment cements].
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[Free mucosal graft: sutured versus glued].
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[Oral rehabilitation in combination with an endosseous implant (III)].
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[Oral rehabilitation in combination with an endosseous implant (I)].
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[Oral rehabilitation in combination with an endosseous implant (II)].
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Comparison of tricalcium phosphate and frozen allogenic bone implants in man.
As part of their treatment, eight patients with 47 infrabony pockets and horizontal bone defects had 29 tricalcium phosphate and 18 frozen allogenic bone implants placed. One year after surgery the sites were reentered. At the tricalcium phosphate implant sites the average amount of bone apposition was 1.2 mm and pocket depth induction 1.8 mm; 38% of the pockets remained deeper than 3.0 mm. At the allogenic bone sites the average amount of bone apposition was 1.5 mm and pocket depth reduction was 2.0 mm; 22% of the pockets remained deeper than 3.0 mm. The implant materials were well tolerated and there were no complications during the period of the study. Though storage and handling of tricalcium phosphate was simpler, use of allogenic bone led to greater bone apposition and reduction in pocket depth.
[Periodontal conditions in patients with crowns and bridgework].
A study evaluating supragingival and subgingival placement of restoration margins in 24 patients following periodontal and reconstruction therapy is presented. After 1 year no significant differences in supragingival plaque retention, tooth mobility, and width of attached gingiva were observed between the two types of restorations. The gingiva of those restorations with supragingival termination of margins showed, however, significantly (p less than 0.001) less inflammation. The pocket depth of restored teeth was significantly greater (p less than 0.001) than that of non-restored. It is concluded that whenever feasable, restorations should terminate above the free margin of the gingiva. Every restoration terminating in the immediate vicinity of or in actual contact with surrounding soft tissue is a potential irritant to that tissue and increases the chance of precipitating periodontal disease. It is mandatory that the patients with such restorations participate in a regular dental hygiene recall program where oral hygiene can be evaluated, physiotherapy procedures reviewed and motivation reenforced.
[Tricalcium phosphate and its biodegradable ceramics in periodontal bone surgery. A review of the literature].
The chemistry, structure, biocompatibility and effect of biodegradable tricalcium phosphate and tricalcium phosphate ceramic are evaluated with the pertinent literature. With proper indication and use the biodegradable tricalcium phosphate implants for the formation of new bone and reattachment in periodontal pockets may be successful. The biodegradable material has to be sufficiently tried out and examined in further animal and clinical studies before recommending it for general use.
Treatment of periodontal pockets with tricalcium phosphate in man. A preliminary report.
After oral hygiene instruction 29 infrabony pockets in 9 patients were treated with deep scaling and flap surgery. The pockets were filled with a biodegradable tricalcium phosphate implant paste. 6 months postoperatively the average reduction of clinical pockets was 2.6 mm and the radiographically detectable attachment was 1.1 mm more coronal than preoperatively. 10% of the pockets remained deeper than 3 mm. Easy handling and simple storage are the predominant advantages of the described implantation material. Before recommending it for general use, however, some technical problems will have to be solved.
[Are allogeneic spongiosa grafts ready for general practice?].
9 subjects with 23 infrabony pockets were filled with 2 differently stored allogenic implants. After 6 months the average pocket reduction was 2.7 mm and bone apposition was 1.0 mm. Surgical corrections were often necessary because of postsurgical flap shrinkage. The relatively demanding procedure makes allogenic bone implants with questionable success not yet an acceptable operative technique for the nonspecialist.
Inhibition of plaque growth with taurolin, vantocil and amine fluoride.
16 dental students rinsed daily with a placebo solution, Taurolin 2% (formaldehyde releasing antimicrobial), Vantocil 0.1% (polybiguanide), and with amine fluoride 0.025%. Depression of plaque growth assess with the Sulcular Plaque Index was 50.6, 40.2 and 21.5%, respectively.
Fracture strength of 5 different all-ceramic crown systems.
PURPOSE: The purpose of this study was to evaluate the fracture resistance of 5 different all-ceramic crown systems (In-Ceram, Empress staining technique, Empress veneering technique, Celay feldspathic system, and Celay In-Ceram system) before and after cyclic preloading in an artificial mouth. MATERIALS AND METHODS: Extracted natural maxillary incisors were prepared with a 90-degree shoulder. The crowns were adhesively luted to the abutments using dual-cured composite cement. Half of the specimens were artificially aged via a chewing simulation and thermocycling, and all specimens were tested for fracture strength. The results were compared with those of porcelain-fused-to-metal (PFM) crowns with circular porcelain-butt margins that were cemented with zinc phosphate cement. RESULTS: The chewing simulation and the thermocycling significantly decreased the fracture strength of all tested crown systems (P < 0.01). There were no statistically significant differences between the all-ceramic crown groups and the PFM crowns. CONCLUSION: All-ceramic crowns can be used for anterior restorations. However, in vivo investigations of all-ceramic crown systems should be undertaken before introducing them into routine clinical use.