摘要:

Lack of bone in localized areas of the jaws frequently poses a problem when placing oral implants. In this clinical study, we have tested an osteopromotive membrane technique for its ability to create bone over buccal fenestrations after fixture installation in the maxilla. 7 patients were selected by the use of CT‐scan. Criteria for patient selection were that the alveolar crest should have a vertical height>I3 mm and a facial‐palatal concavity, where exposure at the central portion of the fixture could be anticipated. One fenestration, randomly chosen, in each patient was covered with an e‐PTFE (expanded polytetrafluoroethylene)(Gore‐Tex GTAM™) membrane. Contralateral fenestrations served as controls (without the placement of a membrane). The amount of newly formed bone was calculated by photometric assessments. The results showed that the fixture fenestrations, treated with the membrane technique, demonstrated a significantly (p<0.005) higher amount of new bone formation compared to the controls, where little or no improvement had taken place at the fenestrations. The study conclusively shows that the membrane technique is a reconstructive technique, able to create new bone at localized bone fenestrations at titanium fixtures. Additionally. the study also demonstrates that the periosteum alone, in adult humans. is not capable of generating new bone at exposed titanium

ISSN:0905-7161    

DOI:10.1034/j.1600-0501.1991.020401.x

出版商:Munksgaard International Publishers    

年代:1991

数据来源: WILEY

摘要:

The aim of the present study was to explore the possibility of achieving osseointegration of dental titanium implants, inserted into alveoli immediately after tooth extraction, by covering the recipient site with a teflon membrane. In each of 7 monkeys, mucoperiosteal flaps were raised on the buccal and palatal aspects of the maxillary molars in both sides of the jaw. The second molars were then extracted and self tapping titanium implants of the screw type (Astra® Dental Implants) were inserted into the sockets of the largest roots. In the coronal portion of the sockets, a void was always present between the implant and the socket walls. In one side of the jaw, a membrane (Gore‐;Tex Aug‐mentation Material@) was adjusted to cover the implant. The implant in the other side of the jaw served as control and was only covered by the tissue flaps. Microscopic analysis after 3 months of healing revealed that soft tissue was facing the coronal portion of the implants to a varying degree in the control side, while osseointegration was consistently observed to the top of the membrane‐covered implants which remained submerged throughout the experimental period. The results suggest that the membrane techniaue can secure complete osseointegration of implants inserted immediately into extraction s

ISSN:0905-7161    

DOI:10.1034/j.1600-0501.1991.020402.x

出版商:Munksgaard International Publishers    

年代:1991

数据来源: WILEY

摘要:

The purpose of the present study was to examine the effect of treating bony craters around titanium dental implants with polytetrafluoroethylene membranes PTFE, with and without grafting of hydroxyapatite (HA), and with HA alone. 4 standardized bone defects were prepared in the alveolar ridge of edentulous areas in each of 7 monkeys. A titanium implant was then placed centrally in each defect, and in each monkey, the defects were treated with 1 of the following 4 treament modalities: 1 coverage with PTFE membrane;(2) grafting of HA and covering with a PTFE membrane;(3) HA grafting;(4) no treatment. Following a healing period of 12 weeks, all animals were sacrificed and mesiodistal ground sections of the treated areas were prepared. The histological analysis showed that all bone defects around the implants treated with PTFE membranes and 5 of the defects treated with HA and PTFE membranes were completely filled with new bone. The defects treated with HA alone and the control defects with no treatment only demonstrated new bone formation in the bottom of the defects. The results suggest that bone defects around titanium implants can be 1 treated successfully with PTFE membranes.

ISSN:0905-7161    

DOI:10.1034/j.1600-0501.1991.020403.x

出版商:Munksgaard International Publishers    

年代:1991

数据来源: WILEY

摘要:

The presence of certain glycosaminoglycans in peri‐implant sulcus fluid may be an effective means of monitoring changes in bone metabolic activity following initial loading of implant abutments. This study has investigated levels of chondroitin 4 sulphate and hyaluronan in peri‐implant sulcus fluid from titanium osseointegrated implants following initial abutment placement and exposure to masticatory stresses. Abutments were placed after a 3‐month osseointegration period post‐initial surgical placement of the interosseous stage. 10 edentulous patients, each with 5 mandibular implants were reviewed at 2, 4, 6 and 8 days after abutment placement. Clinical details were assessed and recorded and sulcus fluid collected in microcapillary tubes for a 5‐min period for each abutment. Levels of glycosaminoglycans were assessed using cellulose acetate electrophoresis and densitometric scanning of alcian blue stained strips against known glycosaminoglycan standards. Maximum levels of sulcus fluid (0.3–1.25 /5 min) were evident at 4 days with a decrease towards 8 days. Levels of sulphated glycosaminoglycans were also maximal at 2–4 days (range 0.03–0.126 μg/5 min) and decreased at 6‐8 days. Hyaluronan was detected within a similar range of values reaching maximal levels at 4 days and decreasing by 8 days. The results indicate that glycosaminoglycan levels of peri‐implant sulcus fluid is an effective means of measuring and maintaining changes in bone metabolism. The absence of proteodermatan sulphate precludes 1 soft tissues being a sou

ISSN:0905-7161    

DOI:10.1034/j.1600-0501.1991.020404.x

出版商:Munksgaard International Publishers    

年代:1991

数据来源: WILEY

摘要:

This study involved 108 patients (age 38–82 years) rehabilitated with overdentures in the lower jaw supported by 2 endosseous screw‐shaped implants. At each follow‐up visit, the clinical attachment level (PAL) around the implants was assessed with a Merrit‐B probe or a constant force electronic probe, Peri‐probe, and biannually parallel long‐cone radiographs were taken to locate the marginal bone level. These data were used to examine the relationship between bone and attachment level estimations around implants. As a mean, bone level was scored 1.4 mm apically of PAL and this difference remained constant with time. The Pearson correlation coefficient between bone level and PAL, for mesial and distal sites, was 0.67 and 0.61 for the Merrit‐B probe, and 0.76 and 0.65, respectively for the Peri‐probe. The highest correlations were obtained for sites with a healthy gingiva or in absence of intra‐bony craters. Duplicate PAL registrations showed a standard deviation for the intra‐examiner variability of 0.37 (Peri‐probe) or 0.40 mm (Merrit‐B probe) with more than 90% of the variation within 0.5 mm. The mean difference in PAL between Merrit‐B probe or Peri‐probe was 0.05 mm. It was concluded that the clinical attachment level determination is a reliable indicator for bone level around implants with

ISSN:0905-7161    

DOI:10.1034/j.1600-0501.1991.020405.x

出版商:Munksgaard International Publishers    

年代:1991

数据来源: WILEY

摘要:

The purpose of this paper is to report the outcome of 1097 consecutively implanted endosteal implants (Brånemark®) into 303 jaws, between September 1983 and May 1990. All implants were placed using the prescribed technique suggested by manufacturer, and were restored either with fixed or removable prosthesis. Alveolar bone resorption (quantity) was scored from lesser to greater degree by assigning a value of l–5 to each jaw, and jaw anatomy was scored from l–l, based on decreasing cortical and cancellous bone quality. The data were separated into fixed and removable prosthesis and analyzed to determine the correlation between success and the scored resorption and jaw anatomy, as well as implant position. Assessment demonstrated a maxillary success rate of 93.4% and a mandibular success rate of 97.2% over a 36‐month period (mean). Results of correlations of success with jaw anatomy for both fixed and removable prosthesis revealed that bone quality 4 exhibited the greatest failure rate. Preoperative resorption values (1‐S) had little effect on failure, and quality appears to influence failure more than I

ISSN:0905-7161    

DOI:10.1034/j.1600-0501.1991.020406.x

出版商:Munksgaard International Publishers    

年代:1991

数据来源: WILEY

摘要:

Supraplant®, the skull in 6 rabbits. The results demonstrate that an implant which is placed on top of bone can be osseointegrated by the guided generation of new bone using membrane barriers

ISSN:0905-7161    

DOI:10.1034/j.1600-0501.1991.020407.x

出版商:Munksgaard International Publishers    

年代:1991

数据来源: WILEY

摘要:

This case report describes the successful rebuilding of jaw bone for the anchorage of an endosseous implant by applying the principle of “guided tissue regeneration”. The extremely reduced bone volume required reconstructive surgery in 2 stages, the 1st surgical procedure being carried out before the installation of the implant and the 2nd simultaneously with the placement of the implant. The biological prerequisites as well as technical demands for this treatment modality are discus

ISSN:0905-7161    

DOI:10.1034/j.1600-0501.1991.020408.x

出版商:Munksgaard International Publishers    

年代:1991

数据来源: WILEY