168 research outputs found
Implant failures and age at the time of surgery: A retrospective study on implant treatment in 2915 partially edentulous jaws
No full textPurpose: To further report and analyze data on the prevalence of implant failures related to age at surgery in partially edentulous jaws. Materials and Methods: Altogether, 2915 partially edentulous jaws (Kennedy Class I and II) were consecutively treated with 9167 implants over a 30-year period (1986-2015) in one referral clinic. All implant failures were consecutively recorded and the first event of implant failure was analyzed in relation to patient age at implant surgery. Results: A total of 2453 patients participated in the study. The main observations were a nonlinear, normal distribution association between risk of implant failure and age at surgery with the highest risk in middle-aged patients. The risk for implant failures was significantly higher for middle-aged patients (45-64 years) than for old patients at the time of surgery (P 79 years. However, younger age groups (<40 years) presented a different pattern. Partially edentulous patients included late in the study (2003-2015) presented a more pronounced nonlinear, normal distribution, and the highest risk of implant failure in patients between 50 and 55 years of age at surgery. Conclusions: An overall nonlinear risk pattern of implant failure was observed, with the highest risk in the middle-aged group at implant surgery. Overall cumulative survival rates were highest in the youngest and oldest age groups at implant surgery, and this pattern became more pronounced in patients included late in the study. © 2019 Wiley Periodicals, Inc
Cemented CeraOne® and Porcelain Fused to TiAdapt™ Abutment Single‐Implant Crown Restorations: A 10‐Year Comparative Follow‐Up Study
No full textBackground: Long-term data comparing cemented and noncemented single-implant restorations has not been reported. Aim: To compare clinical and radiographic performance of single-implant crown restorations made by either directly baked porcelain to custom-made TiAdapttrade mark titanium abutments (Nobel Biocare AB, Göteborg, Sweden) (test) or cement crowns onto CeraOne(R) (Nobel Biocare AB) abutments (control) after 10 years in function. Materials and Methods: Altogether, 35 consecutive patients were provided with 41 turned single Brånemark System(R) implants (Nobel Biocare AB) in the partially edentulous upper jaw. By random, 15 and 20 patients were provided with 18 test and 23 control implant crowns, respectively. Thereafter, clinical and radiographic data were collected and compared between the two groups. Results: None of the implants were found loose during the follow-up period (100%). Few clinical problems were observed, and the overall average marginal bone loss was 0.26 mm (SD 0.64) during 10 years in function. After the final tightening of the crowns, no significant differences were observed between the test and control groups (p > .05). The head of the implants was placed on an average 6.3 mm (SD 2.24) below the cement/enamel junction of the adjacent teeth (range 2.5-10.0 mm). Implants with reported mechanical and/or mucosal problems or placed more apically in relation to the adjacent teeth did not present more bone loss as compared with implants with no problems or placed more coronally, respectively (p > .05). Conclusions: There seems to be no obvious clinical or radiographic differences between the test and control single-implant restorations during 10 years of follow-up. Occasionally, some restorations presented loose abutment screws and/or fistulas during follow-up. This implies a certain need for maintenance where a one-piece single-implant protocol (test) allows both for a simple clinical procedure at placement without cementation problems, as well as for an easy and simple maintenance of installed single implant crowns in long-term function
Implant failures and age at the time of surgery: A retrospective study on implant treatments in 4585 edentulous jaws
No full textBackground There is limited knowledge on the relationship between implant failures and patient age at implant surgery. Purpose To further analyze and report long-term data on previously presented significant associations between implant failures and age at surgery in patients receiving treatment in the edentulous jaw. Materials and Methods A total of 4049 patients were provided with 24 781 implants during 4585 operations in edentulous jaws between 1986 and 2015 in one referral clinic. Patients were thereafter invited to be followed up until the termination of the study. All implant failures were recorded, and nonlinear spline statistical methods and calculations of survival curves for different age groups were used to analyze implant failures related to age at surgery. Results Ten-year age groups presented consistently higher overall survival rates with increasing age. The overall 10-year survival rates for treated jaws without failures ranged between 83.4% and 91.0% for different age groups. The risk of implant failures in 50-year-old patients was higher than in older patients within 15 years of follow-up (66/78 years; P 64 years) patients became more pronounced in patients included later in the study (2003-2015). Conclusions Young edentulous patients presented an overall significantly higher risk of implant failure than did old patients. The risk decreased consistently from patients in the youngest age group (30-39 years) to those in the oldest age group (>79 years), with a more pronounced pattern for the patients included in the late period. This finding suggests a change in patient characteristics during the time of inclusion, but no causal explanations for the present observations have been established
Data on implant failures will show different results depending on how patients are compiled and analyzed: A retrospective study on 3902 individual patients treated either with one single implant or implants in the edentulous upper jaw
No full textPurpose The basic aim of the present study was to analyze the results of implant failures in two different implant populations, and how these results may vary depending on how the data are compiled and analyzed. Materials and Methods Two groups of consecutively treated patients were included who had been provided with either one single implant in a partially edentulous upper jaw (1881 patients) or four to eight implants in an edentulous upper jaw (2031 patients/12 454 implants). The risk of implant failure in the two groups separately and in combination was statistically compared by using uni- and multivariable analyses. Results The two groups showed significant differences in inclusion, surgical treatment protocols, and the risk of implant failures (P < .05). Overall, 25-year patient-level cumulative survival rates (CSRs) were 75.8% and 96.3% for edentulous and single implant treatment, respectively. "Dental condition" was the variable associated with the greatest risk of implant failure (HR 6.00; edentulous). Only one variable was significantly associated with the risk of implant failure in all tested groups ("time after surgery"; a decreased risk was observed over time), and more variables were statistically associated with implant failures in the edentulous group than in the single implant group. Conclusions Edentulous patients present a significantly and substantially higher risk of implant failures than patients provided with a single implant. When patients with different clinical conditions are pooled into the same group, patients with the most common condition in the total group have greatest impact on the result of the total group. Based on the present observations, risk patterns for a certain oral condition are not necessarily comparable with the implant treatment received by other patients, and the external validity may be limited in small, homogeneous groups of patients
Fixed implant‐supported prostheses in the edentulous maxilla. A five‐year follow‐up report.
No full textSeventy-six patients were consecutively treated with fixed prostheses supported by osseointegrated implants in the edentulous maxilla and followed up for 5 years. The mean bone quality and resorption indices were 3.1 and 2.7 at the time of implant placement, respectively. Altogether, 449 standard Brånemark implants were placed. Two patients resumed to complete dentures, and the cumulative implant and prosthesis survival rates were 92.1% and 95.9% for 5 years, respectively. The mean marginal bone level was 0.6 mm below the reference point at the time of placement and 1.2 mm below the same point 5 years later. Speech problems was the most frequent complaint during the first year of function, while resin fractures caused most adjustments during the follow-up period. No implant, abutment or gold alloy screws were found to be fractured, and only 4 patients had their prostheses re-tightened due to loose gold alloy screws
Implant treatment in elderly patients
No full textA group of 48 patients, all more than 80 years old (mean age 82.7 years) at first implant surgery, who received a total of 254 implants, were followed in one clinical center. Of the exposed implants, 6 of 238 (2.5%) were found to be loose at second-stage surgery, and another 3 implants were lost during the follow-up period. Most patients had minimal postplacement problems, similar to what has been observed in younger patients. However, some patients (10%) experienced obvious problems with general adaptation and muscle control, which has not been observed in younger patients
Regeneration of gingival papillae after single-implant treatment
No full textAn index to assess the size of the interproximal gingival papillae adjacent to single implant restorations was described and preliminary tested in a pilot study of retrospective material comprising 25 crowns in 21 patients. The result indicated a significant spontaneous regeneration of papillae (P < .001) after a mean follow-up period of 1.5 years. Based on these results, the general conclusion was made that the proposed index allows scientific assessment of soft tissue contour adjacent to single-implant restorations. The results also indicated that soft tissue changed in a systematic manner during the time period between insertion of the crowns and follow-up 1 to 3 years later
Failures and complications in 391 consecutively inserted fixed prostheses supported by Brånemark implants in edentulous jaws: a study of treatment from the time of prosthesis placement to the first annual checkup
No full textA total of 391 edentulous maxillae and mandibles was consecutively treated with routine fixed prostheses, supported by 2,199 implants. The patients were followed for 1 year; the overall success rate was 99.5% and 98.1% for the prostheses and implants, respectively. The number of severe complications was low, but it was possible to identify a significantly higher ratio of problems in the maxillae throughout the observation period than for the mandibles. While many problems occurred in both the maxillae and mandibles, there were also problems more typical for each jaw. Diction and fractures of resin teeth were more common problems in maxillae; cheek and lip biting was a more frequent postinsertion complication in the treatment of mandibles. Most problems were easily resolved, and the retrievability of the prostheses was of great advantage
Measurements of tooth movements in relation to single-implant restorations during 16 years: a case report
No full textBACKGROUND: Osseointegrated implants behave as ankylotic abutments, and their positions are not affected by dentofacial changes. PURPOSE: To measure changes in occlusion in relation to single implants in one patient after more than 15 years in function. MATERIALS AND METHODS: One 25-year-old female was treated with two single implants in the upper central incisor and bicuspid area after trauma. Study casts made prior to treatment (1987) and after 16 years in function (2004) were scanned by means of an optical scanner. Using the palate as the reference, the models were placed in the same coordinate system and analyzed and compared in a computer-aided design (CAD) program. The results of the measurements of the casts were also compared with clinical photographs taken at the time of treatment (1988), after 9 years (1997), and after 16 years (2004) in function. RESULTS: The clinical photographs showed obvious signs of implant infraposition after 9 years. New crowns were made in the incisor region after 15 years (2002), but signs of infraposition were again present at the final examination (2004). Measurements of the casts indicated small tooth movements with a pattern of slight eruption of upper teeth combined with a palatal inclination, mesial drift, and lingual inclination and crowding of the lower anterior teeth. The small measured vertical eruption of the teeth was less than the observed clinical infraposition of the implant crowns, indicating that the vertical position of the palatal may have changed in relation to the implants as well. CONCLUSION: Obvious dentofacial changes may take place in adult patients. Teeth may adjust for this, and no major problems may arise in the dentate patient. However, because the positions of implants are not affected by dentofacial changes, other patterns of clinical problems can be seen when implant patients present with these changes. The character and frequency of these dentofacial changes that may compromise implant treatment in the long term are not yet known
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