Comparison of fresh autogenous and freeze-dried allogenic skin for mandibular vestibuloplasty

This study compared the ability of fresh autogenous and freeze-dried allogenic split-thickness skin grafts to maintain vestibular depth following vestibuloplasty. Both graft systems resulted in covering of the alveolar ridge by firmly attached tissue, which would be expected to enhance prosthetic stability. The appearance of the fresh autogenous grafts was consistent with that of mature skin grafts, whereas the freeze-dried grafts had the appearance of alveolar mucosa. Vestibular depth stabilized at six weeks with both graft systems, and at six months there was no significant difference (P less than 0.05) between the freeze-dried and fresh grafts with respect to their ability to maintain vestibular depth.     

Severe oral hemorrhage and sepsis following bone marrow transplant failure

Aplastic anemia is a failure of all the cellular components of the bone marrow and, untreated, usually results in death from bleeding and/or infection within 4 months. Treatment by bone marrow transplantation offers the only means of survival. When a bone marrow graft fails, the patient is extremely susceptible to severe infection and/or hemorrhage. In this case, a bone marrow transplantation in a 34-year-old white man with aplastic anemia failed. Among the medical problems that subsequently developed were severe, prolonged and life-threatening oral bleeding and infection.     

Effect of insertion of osseo-integrated prosthesis on the oral microflora

Ten patients undergoing treatment with bridges supported by osseo-integrated oral titanium implants were studied regarding the oral microflora. Saliva samples for microbiological studies were collected before the abutment operation, 1 week after the operation, after the bridges were inserted and again 52 weeks after the abutment operation. The implants did not induce colonization with "plaque streptococci" such as Streptococcus mutans and Streptococcus sanguis. A marked colonization with potentially pathogenic microorganisms such as Staphylococcus aureus, Pseudomonas species and enterobacteria was observed after the abutment operation. This was probably due to the use of surgical dressing.     

The use of an intermediate resin in the acid-etch procedure: retentive strength, microleakage, and failure mode analysis

Three composite resin systems, one conventional (Concise) and two microfilled (IsoPast and Silar), used with and without an intermediate resin (Concise Enamel Bond), were evaluated with and without thermal stress for in vitro retentive strength and sealing ability to acid-etched human enamel. All three materials yielded significantly different shear strength values. The use of an intermediate resin significantly improved both the shear strength and resistance to microleakage of Silar, while no differences were observed for Concise and IsoPast. The thermocycling procedure did not generally or consistently affect the results. The failure mode of the three acid-etched composite resins was studied by evaluation of the failure surface and by describing the percentage of enamel, composite, and interface which were present. The use of an intermediate resin did not significantly influence the failure mode, and the correlation between the failure mode and retentive strength, although significant was low. The study confirmed the importance of adequate wetting action of a resin on the etched enamel to ensure proper bonding.     

Relationship of oral complications to peripheral blood leukocyte and platelet counts in patients receiving cancer chemotherapy.

Patients undergoing cancer chemotherapy often suffer from oral complications as a result of their disease and its treatment. The effects of the chemotherapy on the bone marrow and oral mucosa, coupled with the patient's immunosuppressed state and altered oral microbial flora, predispose these patients to oral mucositis, infection, and hemorrhage. The oral mucosa appears to mirror the effects of the chemotherapy on the bone marrow, as there appears to be a direct relationship between the changing peripheral blood counts and the status of the oral mucosa.     

Effects of 3 months frequent consumption of hydrogenated starch hydrolysate (Lycasin), maltitol, sorbitol and xylitol on human dental plaque.

Lozenges containing hydrogenated starch hydrolysate (Lycasin), maltitol, sorbitol or xylitol were consumed 4 times daily during 3 months by 4 groups of persons (in all 85 subjects). In the maltitol-, sorbitol- and xylitol-group the plque wet weights were of the same magnitude before and after the test period. In the Lycasin-group, a higher value was found after than before the 3-month period (p less than 0.01). The acid production in suspensions of dental plaque material from Lycasin, maltitol and sorbitol expressed as per cent of that from glucose was approximately the same before and after the test period. From xylitol no acid production could be demonstrated either before or after the 3-month period. There were no statistically significant differences between the plaque pH-changes induced by rinsing with 50% solutions of Lycasin, maltitol, sorbitol or xylitol before and after the test period. However, there was a tendency (p less than 0.05) towards lower pH-values induced by the maltitrol and sorbitol rinse after the 3-month period compared with before. No difference in the relative numbers of facultative anaerobic streptococci. Streptococcus mutans or facultative anaerobic lactobacilli before and after the test period was found.     

The upper anterior sectional denture.

An upper anterior sectional denture is described which consists of (1) a cast cobalt-chromium framework with two passive clasps that contact undercuts on the distal surfaces of the most posterior remaining teeth and (2) a labial flange that carries the replaced tooth or teeth and engages the labiointerproximal gingival undercuts of the anterior teeth adjacent to the edentulous ridge. The cast framework is inserted occlusogingivally, and the labial flange is inserted labiolingually. Both sections are held together by the frictional resistance of the split post of the framework that fits into a tube on the labial flange and hollowed-out artificial tooth. With this type of prosthesis, certain clinical problems can be handled without abutment tooth preparation and with a minimal amount of chair time.     

Brain abcess following dental infection.

A 48-year-old woman underwent root canal treatment of the upper left lateral incisor and lower right second premolar. Close to the conclusion of the endodontic treatment she complained about headaches. Later on, because of aggravation of her condition, with headaches, fever, malaise, weakness, and numbness of the right limbs, she was admitted to the hospital. The disease progressed to an epileptic state, with appearance of a right hemiparesis. A brain scan and carotid arteriogram revealed the presence of a mass occupying the left parietal space. Craniotomy disclosed an abscess containing yellow pus from which Streptococcus viridans was cultured. After thorough surgical cleansing of the area, removal of the bone for decompression, and treatment with ampicillin the patient improved gradually and slowly regained the mobility of her right side.