摘要:

The aim of the present investigation was to assess the effect of de novo plaque formation on the gingiva and masticatory mucosa around teeth and implants. The study was performed in 5 beagle dogs which at the initiation of the experiment were 15 months old. During a preparatory period, the mandibular right premolars were extracted, 3 fixtures installed, abutment connection performed and a 4‐month period of plaque control completed. A clinical examination was performed and biopsies of the second mandibular premolar (Pz) and the contralateral implant site (2P) were sampled. The dogs were allowed to form plaque during a period of 3 weeks. The clinical examination was repeated and biopsies harvested from the 2 remaining implants and the contralateral tooth sites. The tissue samples were prepared for histometric and morphometric analysis. Both the masticatory mucosa at implants and the gingiva responded to de novo plaque formation with the development of an inflammatory lesion. The size as well as the composition of the lesions in the 2 tissues had many features in common. It was concluded that the mucosa around implants and the gingiva around teeth had a similar potential to respond to early plaque formatio

ISSN:0905-7161    

DOI:10.1034/j.1600-0501.1992.030101.x

出版商:Munksgaard International Publishers    

年代:1992

数据来源: WILEY

摘要:

The objective of the present experiment was to study lesions in the peri‐implant and periodontal tissues resulting from ligature placement and subgingival plaque formation. The experiment was performed in 5 beagle dogs which at the start of the study were about 15 months old. They were given a diet which allowed gross plaque formation. The mandibular right premolars were extracted, 3 fixtures (a.m. Brånemark) installed and abutment connection performed. Towards the end of a 6‐month plaque control period, a clinical and radiographic examination was performed. Ligatures were placed in a subgingival position at 2 of the implants and the contralateral premolars. Plaque was allowed to accumulate. After 6 weeks, the ligatures were removed. 1 month later, the clinical and radiographical examination was repeated and samples from the subgingival microbiota obtained. Biopsies from the teeth and implant sites were harvested and processed for histometric and morphometric analyses. The results from the clinical and histological examinations revealed that:(i) clinical and radiographic signs of tissue destruction were more pronounced at implants than at teeth;(ii) the size of the soft tissue lesion was larger at implants than at teeth;(iii) the lesion at implants but 1 not at teeth extended into the bone ma

ISSN:0905-7161    

DOI:10.1034/j.1600-0501.1992.030102.x

出版商:Munksgaard International Publishers    

年代:1992

数据来源: WILEY

摘要:

The objective of the present study was to assess possible adaptive functional changes in the masticatory system after insertion of fixed prostheses supported by osseointegrated implants in the edentulous mandible. Registrations of mandibular movement characteristics and maximal biteforce were performed at insertion and after 1 week, 3 months and 1 year after connection. The duration of the opening and closing phase decreased and maximal biteforce increased significantly (p≤0.05–0.001) from connection of the prostheses to the annual check‐up. However, the process of functional adaptation implied2 identified stages. An immediate phase that occurred within the 1st week, probably due to altered impact from mechano‐sensitive receptors and a later more time‐dependent phase, based on learning and new cortical engrams. Accordingly, the process of adaptation will continue over a long perio

ISSN:0905-7161    

DOI:10.1034/j.1600-0501.1992.030103.x

出版商:Munksgaard International Publishers    

年代:1992

数据来源: WILEY

摘要:

The purpose of this study was to develop a digital subtraction technique to assess periimplant bone change. The method uses subtraction radiography to enhance visualization of the area of change that has occurred between radiographic examinations, and superimposes the area of change on the original radiographs. Furthermore, a reference wedge allows calculation of the mass of the lesion. The method was validated using 21 small bony chips placed on 3 different skulls prior to the first radiograph. The chips were removed, a second radiograph taken, and the images subtracted. A morphologic method was used to isolate the lesion and the change in bone mass calculated. Overall, there was excellent correlation between the calculated lesion mass (mg) and actual lesion mass (r²>0.90). The utility of the method was demonstrated using a case that experienced implant failure. These data indicate that quantitative digital subtraction radiography may be of value in measuring peri‐implant 1 bone change in root form implan

ISSN:0905-7161    

DOI:10.1034/j.1600-0501.1992.030104.x

出版商:Munksgaard International Publishers    

年代:1992

数据来源: WILEY

摘要:

The purpose of this study was to develop a repeatable method for measurement of bone support around root form and blade implants suitable for use in high‐quality but unstandardized radiographs. 10 phantoms were fabricated to simulate progressive osseous defects around implants. Radiographs were taken in triplicate and digitized. Specialized software was written which placed a grid of known dimensions over the implant so that the top and the bottom of the grid were at the neck and the base of the implant, respectively. The investigators selected the edge of the bone at each point where the grid intersected the implant and the software automatically detected the implant edge. The software also outlined and displayed the defect on the computer monitor. Measurements were performed 5 times and the standard deviation was taken as a measure of the repeatability of the method. Repeatability for blades and root forms was 0.19 ± 0.07 mm and 0.08 ± 0.03 mm, respectively. There was no significant difference in the ability to measure bone loss in the blade versus the root form (pequals;0.17, NS). These results indicate that this semi‐automated computer‐assisted method for measuring bone loss around implants is repeatable and may be of value for clinical trials using either root form or blade i

ISSN:0905-7161    

DOI:10.1034/j.1600-0501.1992.030105.x

出版商:Munksgaard International Publishers    

年代:1992

数据来源: WILEY

摘要:

The clinical success of 85 Screw Vent® and 107 Bråemark® implants, consecutively installed in a private periodontal clinic under the same conditions and by the same operator, is compared. Mobile implants were removed and considered as failures. Intraoral radiographs were assessed for the presence of peri‐implant radiolucencies and for analysis of bone loss after functional loading. 85 Screw Vent implants were installed in 31 patients. Of 23 implants installed in 9 mandibles, none failed after 16.8 (range 12–25) months of function. Of 62 Screw Vent implants installed in 23 maxillae, 6 failed at abutment connection, 1 failed after 2 months and 2 after 13 months of function. The absolute failure rate after 13.2 (range 6–24) months was 9162. Mean loss of bone was 1.47 mm (‐l.O–+4) after 12 months of functional loading. 107 Brånemark fixtures were installed in 25 patients. Of 51 fixtures inserted in 12 mandibles, none failed; of 56 fixtures installed in 13 maxillae 1 failed before and 2 failed during abutment connection. The absolute failure is 3156. All remaining fixtures were immobile after loading. 13 fixtures were more than 6 months in function. Only short‐term comparison between both systems is possible because the observation time is longer for the Screw Vent implants. In the 1st year, only 1 implant system was available to the periodontist. Short‐term comparison reveals 11.3% versus 5.3% of cumulative failure after 6 months for the Screw Vent and Brånemark implants, respectively. The results indicate that clinical efficacy is as effectively obtained with Screw Vent as with Brånemark implants in the mandible. The outcome of treatment with Screw Vent implants in the maxilla see

ISSN:0905-7161    

DOI:10.1034/j.1600-0501.1992.030106.x

出版商:Munksgaard International Publishers    

年代:1992

数据来源: WILEY

摘要:

The present case report demonstrates the application of guided tissue regeneration (GTR) in combination with antimicrobial therapy for the treatment of an early implant failure. This treatment approach both prevented further loss of bone as well as led to the regeneration of lost bone. By means of color‐converted digital subtraction images, remodelling of the tissues adjacent to the defect was documented as early as one month postsurgically. The images demonstrated “bone‐fill” in the apical portion of the defect and resorptive changes at the bone crest. This case report demonstrates that combined regenerative and antimicrobial therapy may be a successful treatment approach restoring osseointegration of dental implants following loss of bone due to infection. Continuously increasing bone‐fill inside the defect was documented when comparing the radiograph obtained immediately before the GTR procedure and at months 1, 2, 4, 5 and 6 of the healing period, respectively. Clinical measurement obtained at the time of the surgery and at the time of the membrane removal confirmed the radiographic evidence of bone‐fill by demonstrating new tissue resistant to probing in close contact to the implant surface at the site of the previous defect. Antimicrobial therapy included an antibiotic regimen during the 1st month of healing as well as topical rinses with an antiseptic (chlorhexidine) over the entire healing period of 6 months. As a result of this treatment approach, the implant was saved and could be used as an abutment for a bridge rec

ISSN:0905-7161    

DOI:10.1034/j.1600-0501.1992.030107.x

出版商:Munksgaard International Publishers    

年代:1992

数据来源: WILEY