Background: The aim of this study was to evaluate the factors that may affect implant fixture fractures. Methods: Patients who experienced implant fixture removal at Seoul National University Bundang Hospital from 2007 to 2015 due to implant fixture fracture were included. Implant/crown ratio, time of implant fracture, clinical symptoms before implant fracture, treatment of fractured implants, and the success and survival rate of the replaced implants were evaluated retrospectively. Results: Thirteen implants were fractured in 12 patients. Patient mean age at the time of fracture was 59.3 years. Of the 13 implants, 7 implants were placed at our hospital, and 6 were placed at a local clinic. The mean crown/ implant ratio was 0.83:1. The clinical symptoms before fracture were screw loosening in five implants, marginal bone loss in five implants, and the presence of peri-implant diseases in five implants. All the fractured implants were removed, and 12 out of the 13 sites were re-implanted. Parafunctions were observed in two patients: one with bruxism and one with attrition due to a strong chewing habit. Conclusions: Several clinical symptoms before the fracture of an implant can predict implant fixture failure. Therefore, if these clinical symptoms are observed, appropriate treatments can be taken before more serious complications result.
The authors analyzed the three-dimensional postoperative condylar position change across the plating systems. This retrospective study was conducted with the patients who underwent bilateral sagittal split ramus osteotomy with setback surgery. The condylar change was analyzed from preoperative cone-beam computed tomography to postoperative 1 month (T1) and postoperative 6 months (T2) using superimposition software, automatically merging based on the anterior cranial base. The condylar changes during T1 and T2 were analyzed across the four types of plates (4-hole sliding, heart-shaped, 3-hole sliding, and 4-hole conventional) Mean intraclass correlation coefficient values were consistently high for each measurement (>0.850). During T1, the conventional plate had a decreased condylar anterior distance when compared with the 3-hole sliding plate ( P = 0.032). During T2, the conventional plate had an increased condylar posterior distance when compared with the 3-hole sliding plate ( P = 0.031). S uperimposition software based on the anterior cranial base could be available for measurement of condylar position with highly reproducible results. After bilateral sagittal split ramus osteotomy, the 3-hole sliding plate could effectively compensate for the anterior displacement of the condyle compared to other plates.
The aim of this study was to compare and analyze the survival rate, success rate, and loss of marginal bone of internal and external hexes and presence or absence of microthreads of implant immediately installed after tooth extraction. Forty-four implants were installed in 30 patients, average follow-up period was 80 months, and each product was divided into 3 groups. Group 1 is Osstem TS III implant, Group 2 is Osstem US II implant, and Group 3 is Implantium implant. Panoramic and periapical radiographs were used to measure the marginal bone loss. One implant was removed during the study period, and TS III had a survival rate of 100% and a success rate of 88%, US II had a survival rate of 100% and a success rate of 100%, Implantium had a survival rate of 95% and a success rate of 89%. These results suggest that Osstem and Dentium products show good clinical prognosis when implant is immediately installed after extraction, so it may be a good treatment option in the case of indications.
Background : Mechanical complications are inevitable problems in implant restoration. Fracture of an implant fixture is quite rare, but it is one of the complications that surgeons and patients encounter, and requires implant removal (explantation) and re-implantation.Aim/Hypothesis : The aim of this study was to evaluate the factors that may affect the fracture of implant fixtures.Material and Methods : Patients who experienced implant fixture removal at Seoul National University Bundang Hospital from 2007 to 2015 due to implant fixture fracture were selected. Implant Crown ratio, time of implant fracture, clinical symptoms before implant fracture, treatment of fractured implants, success and survival rate, and marginal bone loss of the replaced implants were evaluated retrospectively. Marginal bone loss was measured using panoramic or periapical radiographs. After calculating the enlargement ratio of each radiograph, the amount of marginal bone loss was measured at the mesial and distal sides, and the average was obtained.Results : Thirteen implants were fractured in 12 patients. The mean age of the patients at the time of the fracture was 59.3 years. Of the 13 implants, seven implants were installed in our hospital, and six were implanted in a local clinic. The mean crown implant ratio was 0.83-1. The clinical symptoms before fracture were screw loosening in five implants, marginal bone loss in five, and peri-implant diseases were observed in five. All fractured implants were removed and 12 out of 13 implants were re-implanted. Parafunctions were observed in two patients-one with bruxism and one with attrition due to a strong chewing habit. Six of the upper prostheses were single crown prostheses, and seven were two or more fixed prostheses. There are no cantilevers. The seven implants installed in our hospital took an average of 61.7 months to fracture after prosthesis completion. The average marginal bone loss of the 12 implants re-installed was 0.13 mm, and the success and survival rates were all 100%. Conclusion and Clinical Implications: Screw loosening, peri-implantitis and marginal bone loss were observed before fracture of the implant fixture. Therefore, when symptoms are observed, care should be taken to prevent fracture of the implant.
For the maxillary sinus to normally function, the ventilation and drainage should be well maintained. The natural ostium of the maxillary sinus could be blocked owing to various reasons. In this condition, recurrence is likely to occur although the cause of maxillary sinusitis is treated. In this study, patients with chronic maxillary sinusitis were subjected to preoperative computed tomography. Overall, 11 patients with natural ostium obstruction and nasal septum deviation were examined and underwent otorhinolaryngological surgeries such as functional endoscopic sinus surgery and septoplasty. Of the 11 patients who exhibited complete healing after maxillary sinus treatment, 13 implants were placed in 5 patients. The average follow-up period was 5 years except for 2 patients who were lost to follow-up after prosthetic delivery or repeatedly exhibited failure for osseointegration. The success and survival rates of 9 of 11 patients were 100%, with no marginal bone loss.
Background : Progressive periodontal disease has an adverse effect on the prognosis of implants. In particular, if bone marrow destruction due to periodontal disease continues in the adjacent site where the implant will be placed, the clinician will have the following concerns-possible need for extraction or implant treatment while preserving the tooth as much as possible through surgical treatment.Aim/Hypothesis : This study examined the effects of advanced periodontal disease on implants placed at the same time as adjacent progressive periodontal surgery, by evaluating the survival rate, success rate, and marginal bone loss of implants. Material and Methods :The following patients were selected-1. Those who underwent periodontal surgery due to progressive periodontal disease in the adjacent site where the implant was to be placed and implant installation at the same time. 2. Those who were implanted at the Seoul National University Bundang Hospital from 2003 to 2007. The medical records were reviewed and the complications, implant success rate, survival rate, and marginal bone loss after implant treatment were examined. The marginal bone loss was measured using panoramic or periapical radiographs. After calculating the enlargement ratio of each radiograph, the amount of marginal bone loss was measured at the mesial and distal sides, and the average value was obtained.Results : Eleven implants were placed in a total of nine patients. There were two cases of diabetes mellitus, one case of stroke, and two cases of smokers. Two types of periodontal surgery of the adjacent teeth at the time of implant placement were performed. The regenerative surgery such as guided tissue regeneration or bone graft was performed in eight cases. The respective flap curettage was performed in three cases.Three cases of GBR, two cases of sinus lifting, one case of GBR and sinus lifting were performed at implant placement, and the remaining five implants were simply placed in healthy bone tissue. The type of upper prosthesis of 11 implants was a single crown. Postoperative complications occurred in two patients, and osseointegration failure, hematoma, and abutment fracture occurred. With the exception for the two failed implants, the mean survival duration was 123 months and the success and survival rate were 100%. The mean marginal bone loss of the survived implants was 0.16 mm. Conclusion and Clinical Implications :The prognosis of implants placed at the same time as periodontal surgery for the adjacent natural teeth with progressive periodontitis is reasonable.
This study examined the effects of periodontal disease on implants placed simultaneously with adjacent periodontal surgery through an evaluation of the survival rate, success rate, and marginal bone loss of the implants. In total, 11 implants were placed in nine patients. Regenerative surgery including guided tissue regeneration was performed in eight patients. Resective flap curettage (open flap debridement) was performed in three patients. Seven of the eleven teeth that underwent periodontal surgery were extracted, and the remaining four survived for an average of 6 years and 6 months during follow-up. Two implants failed during the follow-up period. Except the two failed implants, the mean survival period was 94 months and the success and survival rates were 90.9% each. Moreover, the mean marginal bone loss of the survived implants was 0.14 mm. The prognosis of implants placed simultaneously with periodontal surgery of the adjacent natural teeth with periodontitis is reasonable.
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