摘要:

The study examines the effect of maxillary prosthetic appliances on the composition of the microflora in the peri‐implant sulcus. Two groups of patients participated. One group consisted of 18 people with removable prostheses, and a second group of 9 people with fixed prostheses was chosen to match them in age. sex and function period of their prosthetic appliances. One implant site per patient was chosen for microbiological sampling, and the samples were taken on 2 separate occasions from all the subjects, with a 3‐month interval. From those with removable prostheses, a further sample was collected by scraping a squared area from the mucosal side of the prosthesis. The prevalence of black‐pigmentedPorphyromonasl Prevotella. Actinohacllus actinomycetemcomitans, mutans streptococci, lactobacilli, enteric bacteria and yeasts was analysed using blood‐agar and selective agar media. The results show that the prevalence was significantly higher forLactohacillus, Prevotellaspp. and yeasts in subjects with removable prostheses than in subjects with fixed prostheses. No significant difference was registered in the pattern of microbial composition in subjects with the removable prosthesis when the peri‐implant sulcus plaque and the biofilm on the corresponding mucosal side of their prosthesis were examined. The insertion of a removable reconstruction to cover the area of the osseointegrated implants gave rise to a progressive change in the peri‐implant plaque towards a‐more acidur

ISSN:0905-7161    

DOI:10.1034/j.1600-0501.1993.040401.x

出版商:Munksgaard International Publishers    

年代:1993

数据来源: WILEY

摘要:

Three different membranes were tested for guided bone regeneration in 8‐mm unicortical trephine defects in rabbit tibia. All experimental and control defects healed with bone. The critical size defect in rabbit tibia is larger than 8 mm, because control defects, 8 mm in diameter, healed spontaneously. Around remnants of the biodegradable Polyglactin 9 10 mesh (Vicryl®). a diffuse infiltration of inflammatory cells with multinuclear giant cells developed. However, the bone healing was not impaired by the infiltrate. Around the Gore‐Tex® membrane and around remnants of the Alzamer® a few lymphocytes were observed, but no multinuclear giant 1 cells were

ISSN:0905-7161    

DOI:10.1034/j.1600-0501.1993.040402.x

出版商:Munksgaard International Publishers    

年代:1993

数据来源: WILEY

摘要:

The presence and distribution of intraepithelial antigen‐presenting cells was studied in the keratinized mucosa around healthy osseointegrated implants and teeth. Vimentin, cytokeratins, HLA‐Dr, CD18, ICAM‐I and CDla‐positive cells were assessed by a 3‐stage ABC immunoperoxidase system in serial sections from clinically characterized sites. A total of 11 biopsies (7 adjacent to osseointegrated dental implants and 4 adjacent to teeth in healthy volunteers) were qualitatively and quantitatively analyzed. All biopsies displayed the presence of a small inflammatory infiltrate subjacent to themost coronal portion of the junctional epithelium. Intraepithelial antigen‐presenting cell markers were present both around implants and teeth. The observations were consistent with the presence of functional local major histocompatibility complex Class II restricted antigen presentation. Quantitative differences were observed by analysis of variance in terms of different locations within the same section (i.e. junctional epithelium vs oral epithelium) and in terms of the source of the biopsy (i.e. implants vs teeth). The significance, if any, of the observed quantitative difference is discussed in terms of different maturity of the local immune response and possible environmental differences. It is concluded that clinically healthy keratinized mucosa around osseointegrated dental implants shares functional similarities with normal gingiva in terms ofantigen presentation. These results further contribute to the characterization of a functional local immune response that represents the basis for long‐term clinical success of osseointegrated de

ISSN:0905-7161    

DOI:10.1034/j.1600-0501.1993.040403.x

出版商:Munksgaard International Publishers    

年代:1993

数据来源: WILEY

摘要:

Patients with resorbed edentulous upper jaws were arranged into 2 different groups, based on an overall assessment of bone resorption prior to implant surgery. Each group comprised 3.5 patients, all of whom received an overdenture after abutment connection. The patients in the group with the best bone situation were scheduled to receive a fixed prosthesis after 1 year provided that the clinical situation was stable. The overall cumulative implant and prosthesis treatment success rates were 77% and 85%, respectively, for a 3‐year follow‐up period. Nineteen of the patients in the best bone group received a fixed prosthesis after they had used the overdenture for 1 year. These patients exhibited a cumulative implant success rate of 97%. None of the fixed prostheses was lost. Implant failures and other clinical adjustments were frequent for the first year of follow‐up, but the number of problems diminished in the subsequent

ISSN:0905-7161    

DOI:10.1034/j.1600-0501.1993.040404.x

出版商:Munksgaard International Publishers    

年代:1993

数据来源: WILEY

摘要:

The Scanora X‐ray unit permits linear and rotational narrow beam radiography as well as spiral tomography, making it well suited for implant planning radiography. The purpose of this study was to evaluate the reliability of measurements made in spiral lower jaw tomograms of patients examined with the Scanora® technique. Six observers measured the distance between the alveolar crest and the mandibular canal in spiral tomographic images taken on 40 consecutive patients before implant surgery. In one randomly chosen image from each patient, the observers marked the measuring points at the two locations. The measurements were repeated 2 months later. Three of the observers, all radiologists. excluded in total 11 sets of images considered to improve if retaken. Analysis of variance showed an average standard deviation between observers of 1.67 mm. This was mainly due to the intraobserver variation, 1.07 mm. The variation between plots was significantly larger at the alveolar crest. Confidence intervals showed that reliability improves with multiple readings, either made independently by one observer or separately by several. The inter‐ and intraobserver variation decreased to 1.42 mm and 0.86 mm, respectively. without the images of inferior quality. Compared with a similar study based on hypocycloidal images, the variability was less due to the intraobserver variation and was affected positively by an optimized image qua

ISSN:0905-7161    

DOI:10.1034/j.1600-0501.1993.040405.x

出版商:Munksgaard International Publishers    

年代:1993

数据来源: WILEY

摘要:

Nine localized buccal ridge deformities were treated combining the use of barrier membranes and resorbable space‐making material. After elevating flaps, the bone defects were completely filled with calcium carbonate and a fibrin‐fibronectin sealing system (FFSS). Membranes (Gore‐Tex aug‐mentation material) were then shaped and positioned to cover the calcium carbonate overlapping the surrounding bone. The flaps were sutured, taking care to avoid any compression on the treated area. The membranes were removed 4 to 5 months postoperatively: in all cases the membranes were tightly adapted to the regenerated tissues and force was required to separate them from the underlying tissues. The defects were filled with hard, bone‐like tissue. The histology from one case, taken 1 year post‐operatively, confirmed the regeneration of bone and revealed the presence of a few residual particles of calcium carbonate in the sample. The clinical appearance of the treated areas was satisfactory for colour. texture and form. The horizontal deficiencies were almost completely resolved in all cases, while the vertical component showed incomplete filling in

ISSN:0905-7161    

DOI:10.1034/j.1600-0501.1993.040406.x

出版商:Munksgaard International Publishers    

年代:1993

数据来源: WILEY