Home About us Contact
|
Home About us Contact | ||
|
|
||
Peri-implant Inflammation (peri-implant + inflammation)
Selected AbstractsAn Analysis of the Effect of a Vent Hole on Excess Cement Expressed at the Crown,Abutment Margin for Cement-Retained Implant CrownsJOURNAL OF PROSTHODONTICS, Issue 1 2009Dipan Patel BDS Abstract Purpose: The labial margins of anterior implant-retained crowns are often positioned subgingivally for a superior esthetic appearance. One of the consequences of subgingival margins is the increased risk of leaving excess cement behind following cementation. This can lead to potential problems, including peri-implant inflammation, soft tissue swelling, soreness, bleeding or suppuration on probing, and bone loss. The purpose of this laboratory study was to investigate the effect of placement, location, and diameter of a vent hole on the amount of cement being expressed at the margin of an anterior implant abutment-retained crown. Materials and Methods: Three implant crown copings were fabricated to fit on the same custom abutment. Three vent diameters (0.75, 1.25, and 1.65 mm) and three locations on the palatal surface of the coping (cervico-palatally, mid-palatally, inciso-palatally) were chosen for vent hole placement. For each test, the coping was cemented onto the abutment under standardized conditions. A preweighed thin coating of cement was applied to the fit surface of the coping. The amount of cement expressed at the margin and vent hole was measured by weight and calculated as a proportion of the amount of cement placed in the coping before seating. The procedure was completed 15 times for each variable. The results were statistically analyzed using univariate ANOVA with post hoc Bonferroni-adjusted independent samples t -tests. Results: The presence of a vent hole influenced the proportion of cement expressed at the coping margin (p < 0.05). The location of a vent hole influenced the proportion of cement expressed at the coping margin (p < 0.05), with the exception of the mid-palatal and inciso-palatal positioning where there was no significant difference (p= 0.61) between groups. The diameter of the vent hole did not significantly influence the proportion of cement expressed at the coping margin (p= 0.096). Conclusions: When using anterior cement-retained implant crowns, the use of a 0.75-mm mid-palatal or inciso-palatal vent hole to minimize the amount of cement expressed at the margin during cementation should be considered. [source] Increased metal allergy in patients with failed metal-on-metal hip arthroplasty and peri-implant T-lymphocytic inflammationALLERGY, Issue 8 2009P. Thomas Background:, In 16 patients with revised metal-on-metal arthroplasty and peri-implant lymphocytic inflammation, we verified the role of metal hypersensitivity by patch testing (PT) and lymphocyte transformation test (LTT). Methods:, In the 16 patients with lymphocyte dominated periprosthetic inflammation, allergy history was obtained by a questionnaire, specific serum IgE to aeroallergens was measured to assess atopy, PT to standard and metal series was performed and metal sensitivity was further assessed by LTT using blood mononuclear cells. Results:, Revision surgery was performed because of pain (8/16), osteolysis (4/16), dislocation (3/16) and loosening of the stem (1/16). Histological examination showed perivascular infiltrates of T lymphocytes, high endothelial venules, fibrin exudation and accumulation of macrophages with drop-like inclusions. Five patients had a history of cutaneous metal allergy and atopy was found in 25% of the patients. In 13/16 patients (81%), systemic metal sensitivity was found based on PT and/or LTT. Patch test reactions were seen in 11/16 patients (69%; partly multiple reactions/patient): 7/16 to Cobalt (Co), 7/16 to Chromium (Cr), 4/16 to Nickel (Ni), and one each to Molybdenum (Mo) and Manganese (Mn). Ten of 16 patients (62%) showed enhanced LTT reactivity to metals: 7/16 to Ni, 7/16 to Co, 5/16 to Cr, 5/16 to Mo and 4/16 to Mn. Conclusions:, The lymphocyte dominated peri-implant inflammation may well reflect an allergic hyper-reactivity in these patients, given the high rate of concomitantly found metal allergy. Despite the overall incidence of metal implant allergy being low, allergic reactions should be included as differential diagnosis in failed metal-on-metal arthroplasty. [source] OC8 The short-term efficacy of osseointegrated implants in patients with non-malignant oral mucosal disease: a case seriesORAL DISEASES, Issue 2006TA Hodgson Purpose, The spectrum of patients who may wish or warrant osseointegrated implants is increasing, despite few reports of the impact of non-malignant oral mucosal disease upon implant placement. This report details the implant placement outcomes in three patients with pre-existing oral mucosal disease. Case reports,A: Four implants were placed in the lower anterior region of a 78-year-old female with longstanding mucous membrane pemphigoid (MMP) in 2004. The MMP had resulted in extensive cicatrisation of the upper and lower buccal and labial vestibules. One implant failed to osseointegrate, but was successfully replaced. There have been no other postplacement adverse events, despite the MMP remaining mildly active. B: A 36-years-old male with orofacial granulomatosis characterised by recurrent lip swelling and gingival enlargement, had a single implant placed in the upper canine region in 2001. Although still in situ significant peri-implant alveolar bone loss has occurred and has been stabilised by repeated debridement, local administration of topical minocycline and several courses of systemic metronidazole. C: A 53-years-old female with oral manifestations of diffuse systemic sclerosis and fibrosing alveolitis had four lower anterior mandibular implants placed in 1995 to support an 8 unit bridge. One episode of peri-implant inflammation was controlled with local debridement and topical chlorhexidine mouthrinse. The implants remain satisfactory 11 years postinsertion. Conclusion, The short-term failure of osseointegrated implant integration appears uncommon in patients with non-malignant oral mucosal disease. There remains a need to establish appropriate case selection criteria and monitor outcomes. [source] Long-term effects of magnetron-sputtered calcium phosphate coating on osseointegration of dental implants in non-human primatesCLINICAL ORAL IMPLANTS RESEARCH, Issue 2 2009Fügl Alexander Abstract Objectives: To determine the effect of magnetron-sputtered calcium phosphate coating of implants on the later stages of osseointegration in a non-human primate model. Material and methods: Eighteen and 20 implants with a 0.1 ,m amorphous calcium phosphate coating and a turned surface, respectively, were inserted in the anterior upper and lower jaw of adult non-human primates. Following a 7.5 months healing period, one part of the implants remained in the submerged position. The other part of implants was connected to healing abutments to allow peri-implant inflammation to occur. After another 20 months, histologic and histomorphometric analysis of the peri-implant area was performed. Results: Submerged implants with a calcium phosphate coating and a turned surface showed no signs of an inflammatory reaction. The histomorphometric parameters ,bone volume per tissue volume' (BV/TV) and ,bone-to-implant contacts' (BIC) were not affected by calcium phosphate coating. Non-submerged implants of both groups showed occasionally signs of inflammation at the implant,abutment junction. Histomorphometric analysis revealed that the distance between the implant,abutment junction and the most coronal level (where bone was attached to the implant) as well as BV/TV and BIC were independent from the surface modification. Conclusion: Our results show that dental implants with calcium phosphate coating behave similar to turned implants independently whether they are connected to healing abutments or remain submerged. Ultra-thin calcium phosphate coating can combine the positive effects of calcium phosphate during the early stage of osseointegration without causing impairment of the later stages. [source] | ||||||||||