| 61. |
- Jemt, Torsten, 1950, et al.
(författare)
-
Implant-supported welded titanium frameworks in the edentulous maxilla: a 5-year prospective multicenter study.
- 2002
-
Ingår i: The International journal of prosthodontics. - 0893-2174. ; 15:6, s. 544-8
-
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.
|
|
| 62. |
- Jemt, Torsten, 1950
(författare)
-
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
-
Ingår i: International Journal of Prosthodontics. - : Quintessence Publishing. - 0893-2174. ; 31:5, s. 425-435
-
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.
|
|
| 63. |
- Jemt, Torsten, 1950
(författare)
-
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
-
Ingår i: International Journal of Prosthodontics. - : Quintessence Publishing. - 0893-2174. ; 31:6, s. 531-539
-
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.
|
|
| 64. |
- Jemt, Torsten, 1950, et al.
(författare)
-
Implant treatment in edentulous maxillae: a 5-year follow-up report on patients with different degrees of jaw resorption.
- 1995
-
Ingår i: The International journal of oral & maxillofacial implants. - 0882-2786. ; 10:3, s. 303-11
-
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.
|
|
| 65. |
- Jemt, Torsten, 1950
(författare)
-
Implant treatment in elderly patients.
- 1993
-
Ingår i: The International journal of prosthodontics. - 0893-2174. ; 6:5, s. 456-61
-
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.
|
|
| 66. |
- Jemt, Torsten, 1950, et al.
(författare)
-
Implant treatment in the edentulous maxillae: a 15-year follow-up study on 76 consecutive patients provided with fixed prostheses.
- 2006
-
Ingår i: Clinical implant dentistry and related research. - : Wiley. - 1523-0899 .- 1708-8208. ; 8:2, s. 61-69
-
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.
|
|
| 67. |
- Jemt, Torsten, 1950, et al.
(författare)
-
Implant treatment with fixed prostheses in the edentulous maxilla. Part 1: implants and biologic response in two patient cohorts restored between 1986 and 1987 and 15 years later.
- 2011
-
Ingår i: The International journal of prosthodontics. - 0893-2174. ; 24:4, s. 345-55
-
Tidskriftsartikel (refereegranskat)abstract
- Purpose: Implant treatment has been performed for more than 45 years, but there is still limited knowledge on how treatment outcomes are changing over time. The aim of this study was to report and compare the treatment outcomes of two patient cohorts from the same clinic, rehabilitated with fixed implant prostheses in the edentulous maxilla between 1986 and 1987 (early) and 2001 to 2004 (late). Materials and Methods: The early group included 76 edentulous patients who were consecutively provided with 450 turned Branemark System implants; the late group included 109 edentulous patients provided with 360 turned and 310 TiUnite Branemark System implants. Both groups were followed and evaluated clinically and radiographically for 5 years according to similar protocols. Results: Altogether, 37 patients (20%) were lost to follow-up over 5 years; more patients were noncompliant in the late group (P < .05). The 5-year overall implant cumulative survival rates were 93.4% and 97.3% for the early and late groups, respectively. In the early group, significantly more turned implants failed before prosthesis insertion compared to the outcome of TiUnite implants in the late group (P < .05). Mean bone loss was comparable for the early and late groups during the 5 years of follow-up (0.5 ± 0.46 and 0.7 ± 0.76 mm, respectively), but more patients presented at least 1 implant with more than 2 mm of bone loss during the follow-up period in the late group (P < .05). Mucosal hyperplasia and inflammation showed a trend of higher frequency at implants in the early group of patients (P > .05). Conclusion: Implant treatment was more predictable before loading in the late group of patients, related to the change in the implant surface (P < .05). On the other hand, it was observed that the prevalence of patients with more bone loss at at least 1 implant (> 2 mm) was higher in the late group (P < .05). This could possibly be attributed to a more bioactive implant surface and shorter healing period before implant surgery in the late group. Int J Prosthodont 2011;24:345-355.
|
|
| 68. |
- Jemt, Torsten, 1950, et al.
(författare)
-
Implant treatment with fixed prostheses in the edentulous maxilla. Part 2: prosthetic technique and clinical maintenance in two patient cohorts restored between 1986 and 1987 and 15 years later.
- 2011
-
Ingår i: The International journal of prosthodontics. - 0893-2174. ; 24:4, s. 356-62
-
Tidskriftsartikel (refereegranskat)abstract
- Purpose: Implant treatment using osseointegrated implants has been performed for more than 40 years, but limited knowledge is available on how treatment outcomes have changed over time. The aim of this study was to report and compare the prosthetic treatment outcomes from two patient cohorts provided with fixed implant prostheses in the edentulous maxilla between 1986 and 1987 (early) and 2001 to 2004 (late) at the same clinic. Materials and Methods: The two groups of patients comprised 76 and 109 edentulous patients consecutively provided with 450 and 670 Branemark System implants and fixed screw-retained prostheses, respectively. Both groups were followed for 5 years with regard to prosthetic treatment, clinical maintenance, and complications. Results: Altogether, 37 patients (20%) were lost to follow-up during the 5 years, and more patients were noncompliant in the late group (P < .05). Prosthetic treatment was performed using significantly less chair time in the late group (P < .05), and 22 and 68 patients were followed for 5 years without any reported complications in the early and late groups, respectively (P < .05). The 5-year prosthesis cumulative survival rate was 97.1% in the early group and 100.0% in the late group. Patients in the late group presented fewer problems with diction and veneer fractures, and fewer patients had their prostheses temporarily removed for adjustments (P < .05). Conclusion: Prosthetic treatment and maintenance of implant-supported fixed prostheses improved significantly between the groups. Int J Prosthodont 2011;24:356-362.
|
|
| 69. |
- Jemt, Torsten, 1950, et al.
(författare)
-
Incidence of First Implant Failure: A Retroprospective Study of 27 Years of Implant Operations at One Specialist Clinic
- 2015
-
Ingår i: Clinical Implant Dentistry and Related Research. - : Wiley. - 1523-0899 .- 1708-8208. ; 17, s. e501-e510
-
Tidskriftsartikel (refereegranskat)abstract
- © 2015 Wiley Periodicals, Inc. Background: Even though there are many studies available reporting on implant failures, there are few studies that follow implant failures over time in large populations. Purpose: The purpose of this article is to present an overview of the annual incidence of reported implant failures for patients and operations over a 28-year period. Materials and Methods: A total of 8,528 patients were consecutively provided with 39,077 implants in 10,719 implant operations during a 27-year period (1986-2012) at one specialist clinic. All patients with reported failures of implants during a 28-year routine follow-up period (1986-2013) were included, and data from the patients' files were retrieved and reported. Results: Altogether, 857 patients (882 jaws/operations) were identified with one or more failures (10.0% of patients/8.5% of operations). Mean annual incidence of first failure showed obvious variations between years, even between seemingly clinically similar situations. However, incidence of first implant failure was higher for upper than lower jaws (p<.05), within 1 year of surgery (69%) than after 1 year (p<.05), and for implants with a turned surface compared with implants with a moderately rough surface (p<.05). Conclusions: With regard to annual failure incidence in relation to total number of operations over time, obvious variations in failure rate can be observed between seemingly similar clinical situations, as well as significant differences in incidence of first implant failure between the first year after surgery and later time points, between upper and lower jaws using implants with turned surfaces, and between operations to install implants with turned surfaces and those to install implants with moderately rough surfaces.
|
|
| 70. |
- Jemt, Torsten, 1950, et al.
(författare)
-
Incidence of Surgery Related to Problems with Peri-Implantitis: A Retrospective Study on Patients Followed Up between 2003 and 2010 at One Specialist Clinic
- 2015
-
Ingår i: Clinical Implant Dentistry and Related Research. - : Wiley. - 1523-0899. ; 17:2, s. 209-220
-
Tidskriftsartikel (refereegranskat)abstract
- BackgroundLittle knowledge is available on incidence of patients treated for peri-implantitis problems in routine follow-up protocols. PurposeThe aim was to report the incidence, and clinical and radiographic characteristics related to routine follow-up patients who are surgically treated for peri-implantitis problems during 8 years of inclusion. Materials and MethodsPatients with a history of peri-implantitis surgery were identified from patients examined on routine basis at one clinic (Branemark clinic) between January 2003 and December 2010. Data on included patients were retrospectively retrieved and reported from dental records and radiographs. ResultsOn an average, 1,294 patients per year (SD 96) were followed up during inclusion period. Altogether, 134 patients had surgery related to peri-implantitis problems, corresponding to an average of 1.2% of followed-up patients per year. No prosthesis was completely lost, but altogether, 37 implants (6% of included implants) were removed in 34 patients (25%) during these surgical interventions. Peri-implantitis surgery was observed more often in the edentulous upper jaw (p<.05), and there was a tendency that surgery increased by time of follow-up. No significant differences were found between patients provided with machined or medium-rough implant surfaces. ConclusionsIncidence of peri-implantitis surgery was on an average 1.2% of followed-up patients per year during an 8 years period of inclusion. As no data were available on patient compliance, it could be assumed that the result may underscore the clinical need. Significantly, more edentulous upper jaws were included compared with other treated jaw situations. Data also indicated that the need for surgery may increase by time of follow-up, but no significant differences were observed between patients provided with machined and medium-rough implant surfaces.
|
|
