RFs (log rank, p = 0.006)
Fig. 2. The cumulative survival rates for the different RF groups revealing a significant difference for patients without any and patients with local and systemic RFs (log rank, p = 0.006)
Fig. 1. On Kaplan-Meier survival estimates, the cumulative survival rate was 91.5%
Fig. 1. On Kaplan-Meier survival estimates, the cumulative survival rate was 91.5%
Region
Systemic RF
Local RF
Immediate procedure
Bone grafting
Time of failure (months...
Systemic RF
No. of implants (n = 31)
No. of patients (n = 14)
Local RF
No. of implants (n = 100)
...
Saridakis, S.K., Wagner, W. & Noelken, R. Retrospective cohort study of a tapered implant with high primary stability in patients with local and systemic risk factors—7-year data.
Int J Implant Dent 4, 41 (2018). https://doi.org/10.1186/s40729-018-0151-5
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Received: 20 May 2018
Accepted: 24 October 2018
Published: 17 December 2018
DOI: https://doi.org/10...
Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were m...
This article contains data obtained during follow-up in a cohort of patients treated with a CE-certified implant in a University Medical Center. Since the product is already approved in accordance with the German Medical Devices Act, no additional ethics approval was not required for treatment. All procedures performed in studies involving human participants were in accordance with the ethical sta...
Department of Oral and Maxillofacial Surgery – Plastic Surgery, University Medical Center, Johannes Gutenberg University of Mainz, Augustusplatz 2, 55131, Mainz, Germany
Sotirios Konstantinos Saridakis, Wilfried Wagner & Robert Noelken
Private Practice for Oral Surgery, Lindau/Lake Constance, Germany
Robert Noelken
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The work was supported by the Clinic of Oral and Maxillofacial Surgery, University Medical Center, Mainz.
The dataset supporting the conclusions of this article is partially included within the article. The SPSS data can be given on demand of the editor.
Schropp L, Isidor F, Kostopoulos L, Wenzel A. Patient experience of, and satisfaction with, delayed-immediate vs delayed single-tooth implant placement. Clin Oral Implants Res. 2004;15:498–503.
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Ortega-Martinez J, Perez-Pascual T, Mareque-Bueno S, Hernandez-Alfaro F, Ferres-Padro E. Immediate implants following tooth extraction. A systemic review. Med Oral Patol Oral Cir Bucal. 2012;17(2):e251â€...
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This study was based on the recruitment of a quite heterogeneous group of patients treated with NobelActive implants, for the purpose of investigating the influence of local and systemic risk factors on implant survival and marginal bone levels. It can be considered that the presence of local or systemic risk factors does not influence implant survival whereas the combination of local and systemic...
A major weakness of the study is the relative small size of the group with systemic RFs (14 implants by 6 patients) as well as of the group with systematic and local RFs (17 implants by 6 patients). Because of the relative small size of the sample, this study can provide the basis for further investigations based on larger patient samples.
The survival rate for 93 implants in 45 patients with no RFs was 94.8%. Moraschini et al. [44] have exhibited in their systematic review, based on 7711 implants, similar SRs with cumulative mean values of 94.6%. Moreover, in the subcohort of our study, by 44 of the above 93, implants were performed immediate procedures (25 immediate implantations, 35 immediate restorations, 16 both of them) so the...
In one patient with three implants and long intake of corticosteroids against rheumatoid arthritis (7.5 mg prednisolone per day for at least 2 years), no complication was detected in our study. Long-term use of corticosteroids can also lead to implant failures, according to Wood and Vermilyea [34] by modifying the patient’s response to bacterial infection [35], but at the present time, there i...
Most implant studies deal only with local risk factors, although the existence of systemic risk factors plays a significant role to the implant survival. We use the NobelActive dental implant in this study in order to investigate if this promising implant with the special design could achieve better survival rates in difficult situations with several risk factors. The present study revealed no sta...
Regarding the implant shoulder level, the average interproximal marginal bone level was − 0.49 ± 0.83 mm (range, 0 to − 3.3 mm) at the mesial aspect and − 0.51 ± 0.82 mm (range, 0 to − 3.9 mm) at the distal aspect of the implants.
When the marginal bone level was considered as a function of time, there was no strict correlation between the marginal bone status and th...
Ninety-eight patients with 207 implants complied with the treatment protocol attended the follow-up.
During the follow-up period, 15 implants failed in 12 patients. Age and gender were not correlated with a lower implant survival. The implant losses occurred in a time range between 0.5 and 39 months following implant placement (mean 7.3 ± 11.1 months). The reasons for implant failure were ...
Subpopulations within the study group (immediate vs. delayed placement) were compared using the Wilcoxon-Mann-Whitney non-parametric U test. The reported p values were two sided. All calculations were carried out using SPSS for Mac, Version 22 (SPSS Inc., Chicago, IL, USA).
Preservation of all alveolar socket walls via longitudinal extraction after periotomy avoiding oro-vestibular luxation.
Meticulous cleaning of the extraction site.
Placement of rather long implants that allow for a high level of primary stability.
Implant dimensions were as follows: implant length 8.5Â mm, 24 implants; 10Â mm, 6 implants; 11.5Â mm, 64 implants; 13Â mm, 80 implants; 15Â mm, 31 i...
These patients received a total of 207 NobelActive implants (Nobel Biocare, Zurich, Switzerland) placed by two experienced surgeons. Between November 2011 and February 2015, 188 implants were placed in the maxilla, and 19 implants in the mandible. All implant placement procedures were conducted at the Department of Oral and Maxillofacial Surgery of the University Medical Center, Mainz, Germany. Fi...
One hundred and ten patients were invited for follow-up evaluation. All patients were treated in the period from 10/2008 to 02/2015 in the Clinic of Oral and Maxillofacial Surgery, University Medical Center Mainz. Inclusion criteria were as follows: implant placement of a NobelActive implant, study subjects over 18Â years old, residual bone dimension in the edentulous region of at least 5Â mm in h...
Primary stability is a prerequisite for successful osseointegration and remains the most significant factor for the survival of dental implants [16]. Therefore, current research focuses on amelioration of existing augmentation techniques and materials or on the development of new implants with self-tapping properties for improving bone contact as well for increasing primary stability.
The aim of ...
Based on published demographic data, the median age of the world population constantly increases [1]. This has led to an increase in the number of dental implants inserted in senior individuals with local and systemic risk factors [2]. Nevertheless, despite numerous studies having been conducted on this topic, the results remain controversial, almost 50Â years after the first dental implant placem...
This retrospective study examined the mid- to long-term clinical and radiographic performance of a tapered implant in various treatment protocols in patients with local and systemic risk factors (RFs).
Two hundred seven NobelActive implants were inserted in 98 patients in the period from 10/2008 to 02/2015. The subdivision of the cohort was defined by local (n = 40), systemic (n = 6), loc...
Â
Figure 5. Torque-time curves of the MK3 and MK4. a Insertion torque. b Removal torque
Figure 4. Torque-time curves of the TE. a Insertion torque. b Removal torque
Â
Figure 3. Torque-time curves of the BL. a Insertion torque. b Removal torque
Â
Â
Figure 2. Torque-time curves of the ST. a Insertion torque. b Removal torque
Figure 1. Compressed longitudinally to one third for characteristics of implant design. ST Straumann standard implant, MK3 Nobel Biocare MKIII, BL Straumann bone level implant, TE Straumann tapered effect implant, MK4 Nobel Biocare MKIV. Outer surface of implant (solid line). Inner surface of implant (dotted line)
Figure 1. Compressed longitudinally to one third for characteristics of implant d...
Â
Initial area
Parallel area
Tapered area
Platform area
ST6
1.42 ± 0.43
0.31 ± 0.14
–
–
ST8
3.57 ± 1.62
0.35 ± 0.09
–
–
ST10
2.49 ± 0.81
0.45 ± 0.05
–
–
BL8
2.16 ± 0.21
0.50 ± 0.08
2.32 ± 0.52
–
BL10
1.96 ± 0.49
0.35+0.04
2.45+0.23
–
BL12
1.82 ± 0.27
0.33 ±â€...
Code
Insertion torque
Removal torque
Effective thread length (ETL)
(N · cm)
(N · cm)
(×π mm)
ST6
6.19 ± 0.716
5.95 ± 0.718
11.53
ST8
8.06 ± 1.038
9.09 ± 1.093
15.11
ST10
13.13 ± 1.763
12.37 ± 1.746
21.48
BL8
17.67 ± 1.290
16.67 ± 2.140
20.88
BL10
23.56 ± 1.628
21.99 ± 1.530
31....
System
Length
Pitch
Lead
Code
Manufacturer
(mm)
(mm)
(mm)
Standard RN
6, 8, 10
1.2
1.2
ST
Straumann
Bone Level RC
8, 10, 12
0.8
0.8
BL
Straumann
Tapered Effect RN
10
0.8
0.8
TE
Straumann
Brånemark MKIII
10
0.6
1.2
MK3
Nobel Biocare
Brånemark MKIV
10
0.6
1.2
MK4
Nobel Biocare
Abbreviations
BL:
Bone Level RC
IT:
insertion torque value
MK3:
Brånemark MKIII
MK4:
Brånemark MKIV
RT:
removal torque value
ST:
Standard RN
TE:
Tapered Effect RN
References
Friberg B, Sennerby L, Roos J, Johansson P, Strid CG, Lekholm U. Evaluation of bone density using cutting resistance measurements and microradiography. An...
Influence of cortical bone
The reason why a simulation test for only cancellous bone without cortical bone was performed in the present study has already been described. It was reported that bone density and the ratio of cortical bone and cancellous bone have influence on the primary stability of an implant and that higher primary stability is achieved with thread, even at the slightest lev...
Although the removal torque curves measured in the present study had similar shapes to one another, they were divided into two groups upon detailed observation, comprising a group of ST with parallel only, and a group of BL, TE, MK3, and MK4 having tapers and platforms. Since the thread contacts the artificial bone sequentially at the time of insertion, the torque curves showed the character...
This indicates that the friction at the time of rotating and pressing is greater than that at the time of rotating and cutting the bones with a tap and is a reasonable result. In the parallel area, the torque curve was a line with a moderate gradient, and the torque rise rate obtained from the gradient of the line was 0.36 N · cm/s. From this, it is estimated that the torque increase w...
Discussion
Insertion torque curve
In 2000, O’Sullivan reported torque curves for a prosthetic implant for the first time, and evaluated the characteristics of the tapered type by torque curves obtained by inserting five kinds of implants into the maxillary bone of unembalmed human cadavers. In a subsequent review, Meredith cited six kinds of torque curves when the final osteotomy diamete...
For the TE, the lower part of the implant was parallel and the lateral surface and axial surface had the same taper in the cervical region. TE10 in Fig. 4a showed a torque curve with a similar form to BL10 in Fig. 3 and had three kinds of areas. The torque curves for MK3 and MK4 in Fig. 4a had an area in which the torque finally rose suddenly after reaching its critical point and became moderate...
Results
Insertion torque
The insertion torque curve was divided into four regions. The first was the region where the torque rose suddenly immediately after insertion, which was seen in all implant bodies (shown as ① in the figure, and hereinafter called the initial area). The second was the region where the torque rose linearly with a moderate gradient, which was seen in all implant bodie...
Methods
Implants
The type of implant used for the experiments and the characteristics of its design are shown in Table 1 and Fig. 1, respectively. Figure 1 shows that the implant is compressed longitudinally to one third. The outer surface of the implant is indicated with a solid line, and the inner surface of the implant is indicated with a dotted line.
Preparation of an implant socket in ...
Background
Primary stability following implant placement is an essential condition for osseointegration. The primary stability is affected by the implant design, including surface-modifying or implant cavity-forming techniques, as well as by the bone quantity and bone density of the patient. In recent years, the interest of implant manufacturers and clinicians has shifted to the acquisition of ...
Abstract
Background
Primary stability following implant placement is essential for osseointegration and is affected by both implant design and bone density. The aim of this study was to compare the relationships between torque-time curves and implant designs in a poor bone quality model.
Methods
Nine implant designs, with five implants in each category, were compared. A total of 90 implants ...