| 51. |
- Jemt, Torsten, 1950, et al.
(författare)
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Early Implant Failures Related to Individual Surgeons: An Analysis Covering 11,074 Operations Performed during 28 Years
- 2016
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Ingår i: Clinical Implant Dentistry and Related Research. - : Wiley. - 1523-0899. ; 18:5, s. 861-872
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Tidskriftsartikel (refereegranskat)abstract
- Background: Compared with knowledge on patient and implant component factors, little knowledge is available on surgeons' role in early implant failures. Purpose: To report incidence of early implant failures related to total number of operations performed by individual surgeons. Materials and Methods: Early implant failures (21 year of implant prosthesis function) were reported after a total of 11,074 implant operations at one specialist clinic during 28 years of surgery. Altogether, 8,808 individual patients were treated by 23 different dentists, of whom 21 surgeons were specialists in oral surgery or periodontology. Recorded failures were related to total numbers of performed operations per surgeon, followed by statistical comparisons (chi(2)) between surgeons with regard to type of treated jaw and implant surface. Results: Altogether, 616 operations were recorded with early implant failures (5.6%), most often observed in edentulous upper jaws after placing implants with a turned surface (p <.05). Significant differences between surgeons, gender of surgeon, type of treated jaws by the surgeon, and implant surface used by the surgeon could be observed (p <.05). Conclusions: Early implant failures are complex, multifactorial problems associated with many aspects in the surgical procedure. A stochastic variation of failures for individual surgeons could be observed over the years. Different levels of failure rate could be observed between the surgeons, occasionally reaching significant levels as a total or for different jaw situations (p <.05). The surgeons reduced their failure rates when using implants with moderately rough surfaces (p <.5), but the relationship of failure rate between the surgeons was maintained.
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| 52. |
- Jemt, Torsten, 1950, et al.
(författare)
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Failures and complications in 127 consecutively placed fixed partial prostheses supported by Brånemark implants: from prosthetic treatment to first annual checkup.
- 1992
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Ingår i: The International journal of oral & maxillofacial implants. - 0882-2786. ; 7:1, s. 40-4
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Tidskriftsartikel (refereegranskat)abstract
- Ninety-six partially edentulous maxillae and mandibles were consecutively treated with 127 freestanding fixed prostheses supported by 354 implants. The patients were followed for 1 year and the overall success rate was 98.6% for the examined implants. None of the inserted prostheses was lost during the observation period. The most commonly reported problems during the first year of function were related to loose gold screws and esthetic complaints, complications that were easily resolved. Furthermore, the total number of complications was low and was less than has been reported for routine full-arch fixed prostheses.
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| 53. |
- Jemt, Torsten, 1950
(författare)
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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.
- 1991
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Ingår i: The International journal of oral & maxillofacial implants. - 0882-2786. ; 6:3, s. 270-6
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Tidskriftsartikel (refereegranskat)abstract
- A 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.
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| 54. |
- Jemt, Torsten, 1950
(författare)
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Fixed implant-supported prostheses in the edentulous maxilla. A five-year follow-up report.
- 1994
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Ingår i: Clinical oral implants research. - : Wiley. - 0905-7161. ; 5:3, s. 142-7
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Tidskriftsartikel (refereegranskat)abstract
- Seventy-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.
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| 55. |
- Jemt, Torsten, 1950, et al.
(författare)
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Fixed implant-supported prostheses with welded titanium frameworks.
- 1992
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Ingår i: The International journal of periodontics & restorative dentistry. - 0198-7569. ; 12:3, s. 177-84
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Tidskriftsartikel (refereegranskat)abstract
- Eighty-six edentulous patients provided with Brånemark implants were randomly selected for fixed prostheses with modified framework designs. This study describes alternative laboratory techniques in which premachined titanium components are welded together to form the framework. Clinical experience, following the patients for 1 year after placement, indicates that it is a predictable technique with a similar pattern of complications as experienced by patients with cast frameworks supported by implants. The prostheses are considered to be slightly more bulky than cast frameworks, but seem to have, on a clinical level, a better fit to the implants.
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| 56. |
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| 57. |
- 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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| 58. |
- 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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| 59. |
- 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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| 60. |
- 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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