| 43371. |
- Jemt, Torsten, 1950
(författare)
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Implant failures and age at the time of surgery: A retrospective study on implant treatment in 2915 partially edentulous jaws
- 2019
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Ingår i: Clinical Implant Dentistry and Related Research. - : Wiley. - 1523-0899. ; 21:4, s. 686-692
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Tidskriftsartikel (refereegranskat)abstract
- Purpose: 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 <.05). The overall cumulative survival rates for treated jaws increased consistently from the age group of 40 to 49 years to that of >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.
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| 43372. |
- Jemt, Torsten, 1950
(författare)
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Implant failures and age at the time of surgery: A retrospective study on implant treatments in 4585 edentulous jaws
- 2019
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Ingår i: Clinical Implant Dentistry and Related Research. - : Wiley. - 1523-0899 .- 1708-8208. ; 21:4, s. 514-520
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Tidskriftsartikel (refereegranskat)abstract
- Background 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 < 0.05). The difference between young (<45 years), middle-aged (45-64 years), and old (>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.
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| 43373. |
- Jemt, Torsten, 1950, et al.
(författare)
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Implant failures before and after peri-implantitis surgery: A retrospective study on 207 consecutively treated patients
- 2020
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Ingår i: Clinical Implant Dentistry and Related Research. - : Wiley. - 1523-0899 .- 1708-8208. ; 22:5, s. 567-573
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Tidskriftsartikel (refereegranskat)abstract
- Purpose This study aimed to report implant failures before and after peri-implantitis surgery (P-IS) and to compare the pattern of implant failures with in untreated at-risk patients during the same period. Materials and Methods A total of 5628 untreated at-risk patients (7240 jaws) and 207 consecutively patients treated with P-IS (212 jaws) were included in two groups. Implants were placed and followed-up between 1986 and 2018. Cumulative survival rates (CSR) for patients treated with P-IS after 2003 were calculated before and after P-IS and compared with those for nontreated patients. Results The overall 15-year CSR was 91.2% (CI 95%; 90.5%-91.9%) and 68.5%, (CI 95%, 62.1%-75.5%) for untreated patients at risk and P-IS patients, respectively (P < .05). The 10-year CSR (baseline 1 year after implant surgery) was 97.2% (CI 95%, 95.2%-100%) for treated patientsbeforeP-IS which was comparable with that for untreated patients: 95.4% (CI 95%, 94.8%-97.7%). The corresponding 10-year CSR for P-IS patientsaftersurgery was significantly lower (71.6%: CI 95%, 63.1%-81.3% (P < .05)). Conclusion CSR for patients/jaws without implant failures was comparable between untreated and treated P-IS patientsbefore, but lower for P-IS patientsafterP-IS (P < .05). A negative effect of P-IS on implant survival after treatment cannot be disregarded.
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| 43374. |
- Jemt, Torsten, 1950, et al.
(författare)
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Implant-supported laser-welded titanium and conventional cast frameworks in the partially edentulous law: a 5-year prospective multicenter study.
- 2003
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Ingår i: The International journal of prosthodontics. - 0893-2174. ; 16:4, s. 415-21
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Tidskriftsartikel (refereegranskat)abstract
- PURPOSE: This study evaluated and compared the clinical performance of laser-welded titanium fixed partial implant-supported prostheses with that of conventional cast frameworks in the partially edentulous jaw. MATERIALS AND METHODS: Forty-two patients provided with Brånemark system implants were arranged into two groups. Twenty-one patients (group A) were provided with a conventional cast ceramometal framework in one side of the jaw and a laser-welded titanium framework with low-fusing porcelain in the other side. In group B, 21 patients received a titanium framework prosthesis to replace a conventional implant prosthesis. Clinical and radiographic data were collected for 5 years. RESULTS: Four implants and one titanium framework were lost during the follow-up period. The two framework designs did not show any significant differences with regard to implant or prosthesis survival (P > .05). Few clinical complications were observed. In group A, marginal bone loss after 5 years was similar for both prosthesis designs, with an average of 0.1 mm and 0.3 mm in the maxilla and mandible, respectively. Basically, no bone loss was observed on average in group B. Furthermore, no significant relationship was observed between marginal bone loss and placement of prosthesis margin or prosthesis design. CONCLUSION: Except for an insignificant tendency toward a slightly higher incidence of small chips of porcelain veneers, laser-welded titanium frameworks presented an overall similar clinical performance as conventional cast frameworks in partial implant situations after 5 years.
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| 43375. |
- Jemt, Torsten, 1950, et al.
(författare)
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Implant-supported welded titanium frameworks in the edentulous maxilla: a 5-year prospective multicenter study.
- 2002
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Ingår i: The International journal of prosthodontics. - 0893-2174. ; 15:6, s. 544-8
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Tidskriftsartikel (refereegranskat)abstract
- PURPOSE: This study evaluated the 5-year clinical and radiographic performance of fixed implant-supported maxillary prostheses with either welded titanium or conventional cast-gold alloy frameworks. MATERIALS AND METHODS: Fifty-eight consecutive patients were provided with 349 osseointegrated Brånemark system implants in the edentulous maxilla at six different implant centers. Twenty-eight of the patients received, at random, prostheses with laser-welded titanium frameworks, and the remaining 30 patients had prostheses with conventional cast-gold alloy frameworks. Clinical and radiographic data were collected for 5 years after prosthesis placement. RESULTS: The titanium and cast-gold framework groups exhibited similar cumulative survival and success rates (CSR). The 5-year implant CSR from time of placement was 91.4% and 94.0%, respectively, and from prosthesis delivery the rate was 94.9% and 95.6%, respectively. The corresponding 5-year prosthesis CSRs were 96.4% and 93.3%. One patient from each group lost all the implants and turned to complete dentures within the first year of function. Another patient with a cast-gold framework had the prosthesis replaced after 4 years, basically because of problems with the veneering material. No fractures of implant components were observed during the follow-up period. Bone loss was on average 0.59 mm (SD 0.97 mm) during 5 years, with no statistical difference between the two groups. CONCLUSION: Welded titanium frameworks presented a similar favorable clinical performance as conventional cast-gold alloy frameworks in fixed implant-supported prostheses in the edentulous maxilla after 5 years in function. Implant failures were concentrated in only a few patients in each study group.
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| 43376. |
- Jemt, Torsten, 1950
(författare)
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Implant Survival in the Edentulous Jaw-30 Years of Experience. Part I: A Retro-Prospective Multivariate Regression Analysis of Overall Implant Failure in 4,585 Consecutively Treated Arches
- 2018
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Ingår i: International Journal of Prosthodontics. - : Quintessence Publishing. - 0893-2174. ; 31:5, s. 425-435
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Tidskriftsartikel (refereegranskat)abstract
- Purpose: To report retro-prospective data on the prevalence of overall implant failure in a large number of edentulous patients treated at one referral clinic over a 30-year period and to analyze possible associations between implant failure and basic clinical variables Materials and Methods: Altogether, 24,781 implants were consecutively placed in 4,585 edentulous arches between 1986 and 2015. All implant failures identified at the clinic during follow-up were consecutively recorded, and a multivariate logistic regression analysis was performed to identify possible associations between implant failure and different clinical factors. Results: Altogether, 1,333, 688, and 249 treated arches were followed up for 15, 20, and 25 years, respectively. Cumulative survival rates (CSR) for the treated arches were 86.2% and 83.8% after 15 and 25 years, respectively. Most patients lost only one implant each (58%). Loss of all implants was reported in 68 arches, with total failure rates of 1.9% and 2.2% after 15 and 25 years, respectively. The strongest associations with increased risk for implant failure were maxilla (hazard ratio [HR] 4.76: 95% confidence interval [CI] 3.70 to 6.25) and implant surface (HR 2.38: 95% CI 1.59 to 3.57). Age at surgery, implant surgeon, calendar year of surgery, and time of follow-up also showed significant associations with risk of implant failure (P < .05). A completely steady-state level in implant survival was not observed, but few implants were lost up to the last years of follow-up. Conclusion: There is a higher risk for implant failure in the maxilla compared to the mandible. Risk is reduced when using implants with a moderately rough surface. The highest risk for failure was observed during the first year. This was followed by a reduced failure rate, which never reached a steady-state level.
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| 43377. |
- Jemt, Torsten, 1950
(författare)
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Implant Survival in the Edentulous Jaw: 30 Years of Experience. Part II: A Retro-Prospective Multivariate Regression Analysis Related to Treated Arch and Implant Surface Roughness
- 2018
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Ingår i: International Journal of Prosthodontics. - : Quintessence Publishing. - 0893-2174. ; 31:6, s. 531-539
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Tidskriftsartikel (refereegranskat)abstract
- Purpose: To report retro-prospective, long-term data on the prevalence of implant failures related to maxillary and mandibular arches and to different implant surfaces in a large number of edentulous patients. Materials and Methods: Altogether, 3,493 and 1,092 edentulous arches were consecutively treated with implants with turned (1986-2002) or moderately rough (2003-2015) surfaces, respectively, during two time periods at one referral clinic. All implant failures were consecutively identified during routine follow-up, and a multivariate logistic regression analysis was performed to analyze implant failure related to arch and implant surface. Results: Overall cumulative survival rates (CSR) for arches treated with turned surface implants were 75.7% and 94.6% for the maxilla and mandible, respectively. The corresponding 10-year CSRs for arches treated with implants with a moderately rough surface were 91.9% and 96.1%, respectively. The strongest significant association (P < .05) with risk for implant failure was the maxilla, and this was more pronounced for implants with a turned surface. Age at surgery, implant surgeon, calendar year of surgery, and time of follow-up also had significant associations with risk of implant failure (P < .05). Conclusion: Risk for implant failure was significantly higher for treatment in the maxilla, but this risk was decreased significantly when using implants with a moderately rough surface. The impact of surface was not so obvious for treatment in the mandible. Risk for late implant failures after the first year was lower for implants with a moderately rough surface in the maxilla, but this risk seemed to be comparable for the different surfaces in the mandible.
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| 43378. |
- Jemt, Torsten, 1950, et al.
(författare)
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Implant treatment in edentulous maxillae: a 5-year follow-up report on patients with different degrees of jaw resorption.
- 1995
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Ingår i: The International journal of oral & maxillofacial implants. - 0882-2786. ; 10:3, s. 303-11
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Tidskriftsartikel (refereegranskat)abstract
- In a retrospective study, 150 patients with edentulous maxillae were selected for treatment with Brånemark implants. The patients were arranged into four different groups, based on jaw shape prior to implant placement. After second-stage surgery, they were provided with either fixed prostheses, removable overdentures followed by fixed prostheses after at least 1 year, or overdentures for the whole period. Patients were followed up for 5 years, with implant and prosthesis survival, annual visits, marginal bone loss, and complications recorded. Results of the study indicated that treatment outcome in edentulous maxillae might be predicted by careful presurgical evaluation of jaw shape. Five-year cumulative implant failure rates varied from 7.9% for patients considered to have enough bone to be provided with fixed prostheses immediately after second-stage surgery to 28.8% for those with severely resorbed jaws receiving an overdenture. The corresponding cumulative prosthesis failure rates were 3.0% and 18.9%, respectively. Patients provided with autogenous bone grafts compared favorably to the group presenting severely resorbed jaws and provided with overdentures, but showed a compromised result compared to the group with the least resorption. Failure of implant treatment correlated significantly with bone quality and ratio of 7-mm implants. All groups, except those treated with bone grafts, showed an average marginal bone level of 1.2 mm after 5 years, irrespective of type of prosthesis. The bone-grafted group showed a corresponding mean level of 2.3 mm after 5 years of function. Regarding clinical complications, a different pattern, mainly related to the type of prosthetic construction used, was observed between the groups. The number of visits clearly indicated that severely resorbed jaws provided with overdentures were the most demanding.
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| 43379. |
- Jemt, Torsten, 1950
(författare)
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Implant treatment in elderly patients.
- 1993
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Ingår i: The International journal of prosthodontics. - 0893-2174. ; 6:5, s. 456-61
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Tidskriftsartikel (refereegranskat)abstract
- A 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.
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| 43380. |
- Jemt, Torsten, 1950, et al.
(författare)
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Implant treatment in the edentulous maxillae: a 15-year follow-up study on 76 consecutive patients provided with fixed prostheses.
- 2006
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Ingår i: Clinical implant dentistry and related research. - : Wiley. - 1523-0899 .- 1708-8208. ; 8:2, s. 61-69
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: Few long-term follow-up studies are available on implant treatment based on patient level data related to time. PURPOSE: The aim of this study was to report 15-year patient-based data in relation to time of follow up after treatment with fixed prostheses supported by implants in the edentulous upper jaw. MATERIALS AND METHODS: Seventy-six edentulous consecutive patients, provided with 450 turned Brånemark implants, were followed up with regard to maintenance, complications, and radiographs taken during the follow-up period. RESULTS: Forty-four patients provided with 247 implants were lost to follow up. Patients followed up for 15 years showed as a group a trend of better implant survival than patients lost to follow up (p > .05). Altogether, 37 implants and 5 fixed prostheses failed during the follow-up period. Most implants were lost at abutment surgery (n- 15) and another nine during the first year of function. The 15-year implant and fixed prosthesis cumulative survival rate was 90.9 and 90.6%, respectively. Resin veneer fractures caused most problems, more frequent in the earlier stage while severe wear increased in the later stage of follow up. No implant fractures or loosening of abutment/bridge locking screws were noted. The mean marginal bone loss was 0.5 mm (SD 0.47) after 5 years, followed by only minimal average changes during the following years. No radiographic parameter showed any time-dependent relationship. The percentage of patients presenting at least one implant with more than 2.0-mm bone loss was 4.9% in the interval from 0 to 5 years and 4.0% between 10 and 15 years. Only 1.3% of implants showed >3.0 mm accumulated bone loss after 15 years. CONCLUSION: Implant treatment in the edentulous upper jaw functions well in a 15-year time perspective, but an insignificant trend of higher implant failures was observed for patients lost to follow up. Besides wear and fractures of veneers, no other parameter showed any time-related relationship, indicating an increased risk for more complications during later stages of follow up. However, accumulation of smaller amount of bone loss during the years resulted in an increasing number of implants and patients with bone levels below the third thread, which could be speculated to increase future maintenance after 15 years.
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