Influence of Underpreparation on Primary Stability of Implants Inserted in Poor Quality Bone Sites: An In Vitro Study

2015 ◽  
Vol 73 (6) ◽  
pp. 1084-1088 ◽  
Author(s):  
Marco Degidi ◽  
Giuseppe Daprile ◽  
Adriano Piattelli
Keyword(s):  
In Vitro Study ◽  
Primary Stability ◽  
Poor Quality ◽  
Vitro Study

scholarly journals Comparison of Osteotome and Conventional Drilling Techniques for Primary Implant Stability: An In Vitro Study

2016 ◽  
Vol 42 (4) ◽  
pp. 321-325 ◽  
Author(s):  
Ioanna N Tsolaki ◽  
Pallavi P Tonsekar ◽  
Babak Najafi ◽  
Howard J Drew ◽  
Andrew J Sullivan ◽  
...  
Keyword(s):  
Pearson Correlation ◽  
In Vitro Study ◽  
Primary Stability ◽  
Poor Quality ◽  
Vitro Study ◽  
Insertion Torque ◽  
Low Density ◽  
Posterior Maxilla ◽  
Conventional Drilling

It may be difficult to achieve primary stability in the posterior maxilla because of poor quality and quantity of bone. Studies have shown that the osteotome technique immediately increases bone density thereby increasing primary stability. An in vitro study was conducted to compare the stability achieved by the osteotome and conventional drilling techniques in low density bone. Forty endosseous implant fixtures (n = 40) were inserted in a solid rigid polyurethane block simulating low density (D3) bone. The implants were divided into 4 groups to test 2 variables: (1) implant length (10 mm or 13 mm) and (2) preparation of osteotomy (conventional drilling or osteotome technique). Insertion torque (IT) and resonance frequency analysis (RFA) were measured for each implant. Statistical analysis using one-way ANOVA and Tukey post hoc test was done to study IT and RFA data of the 4 groups. Pearson Correlation test was used to determine the correlation between IT and RFA values of the implants. The IT and RFA values were statistically significant higher using the osteotome technique as compared to conventional drilling (P < 0.0001). Statistically significant higher values were also found for IT and RFA of 13 mm implants as compared to 10 mm implants. A significant correlation was found between insertion torque and RFA values in all 4 groups (r = 0.86, P < 0.0001). The conclusion was that the osteotome technique significantly increased primary stability.

scholarly journals Relationship between Implant Geometry and Primary Stability in Different Bony Defects and Variant Bone Densities: An In Vitro Study

Materials ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 4349
Author(s):  
Ahmad Ibrahim ◽  
Marius Heitzer ◽  
Anna Bock ◽  
Florian Peters ◽  
Stephan Christian Möhlhenrich ◽  
...  
Keyword(s):  
In Vitro Study ◽  
Primary Stability ◽  
Tissue Level ◽  
Significant Loss ◽  
Titanium Implants ◽  
Vitro Study ◽  
Loss Of Stability ◽  
Implant Stability ◽  
Bone Level

Aim: This in vitro study aimed to evaluate the effects of implant designs on primary stability in different bone densities and bony defects. Methods: Five implant types (tapered-tissue-level, tissue-level, zirconia-tissue-level, bone-level, and BLX implants) were used in this assessment. The implants were inserted into four different artificial bone blocks representing varying bone-density groups: D1, D2, D3, and D4. Aside from the control group, three different types of defects were prepared. Using resonance frequency analysis and torque-in and -out values, the primary stability of each implant was evaluated. Results: With an increased defect size, all implant types presented reduced implant stability values measured by the implant stability quotient (ISQ) values. Loss of stability was the most pronounced around circular defects. Zirconia and bone-level implants showed the highest ISQ values, whereas tissue level titanium implants presented the lowest stability parameters. The implant insertion without any thread cut led to a small improvement in primary implant stability in all bone densities. Conclusions: Compared with implants with no peri-implant defects, the three-wall and one-wall defect usually did not provide significant loss of primary stability. A significant loss of stability should be expected when inserting implants into circular defects. Implants with a more aggressive thread distance could increase primary stability.

scholarly journals An in vitro study of factors affecting the primary stability of orthodontic mini-implants

2012 ◽  
Vol 82 (6) ◽  
pp. 1022-1028 ◽  
Author(s):  
Lindsy Holm ◽  
Susan J. Cunningham ◽  
Aviva Petrie ◽  
Richard R. J. Cousley
Keyword(s):  
In Vitro Study ◽  
Primary Stability ◽  
Vitro Study ◽  
Factors Affecting ◽  
Mini Implants

Effects of lateral cortical anchorage on the primary stability of implants subjected to controlled loads: an in vitro study

2012 ◽  
Vol 50 (2) ◽  
pp. 161-165 ◽  
Author(s):  
Jian-rui Xiao ◽  
Yong-Qi Li ◽  
Su-Min Guan ◽  
Liang Kong ◽  
Baolin Liu ◽  
...  
Keyword(s):  
In Vitro Study ◽  
Primary Stability ◽  
Vitro Study ◽  
Cortical Anchorage

scholarly journals Biomechanics of a cemented short stem: a comparative in vitro study regarding primary stability and maximum fracture load

2021 ◽  
Author(s):  
Tobias Freitag ◽  
Karl Philipp Kutzner ◽  
Ralf Bieger ◽  
Heiko Reichel ◽  
Anita Ignatius ◽  
...  
Keyword(s):  
Bone Quality ◽  
Periprosthetic Fracture ◽  
In Vitro Study ◽  
Primary Stability ◽  
Fracture Load ◽  
Vitro Study ◽  
Short Stem ◽  
Significant Difference ◽  
Short Stems

AbstractPurposeIn total hip arthroplasty, uncemented short stems have been used more and more frequently in recent years. Especially for short and curved femoral implants, bone-preserving and soft tissue-sparing properties are postulated. However, indication is limited to sufficient bone quality. At present, there are no curved short stems available which are based on cemented fixation.MethodsIn this in vitro study, primary stability and maximum fracture load of a newly developed cemented short-stem implant was evaluated in comparison to an already well-established cemented conventional straight stem using six pairs of human cadaver femurs with minor bone quality. Primary stability, including reversible micromotion and irreversible migration, was assessed in a dynamic material-testing machine. Furthermore, a subsequent load-to-failure test revealed the periprosthetic fracture characteristics.ResultsReversible and irreversible micromotions showed no statistical difference between the two investigated stems. All short stems fractured under maximum load according to Vancouver type B3, whereas 4 out of 6 conventional stems suffered a periprosthetic fracture according to Vancouver type C. Mean fracture load of the short stems was 3062 N versus 3160 N for the conventional stems (p = 0.84).ConclusionPrimary stability of the cemented short stem was not negatively influenced compared to the cemented conventional stem and no significant difference in fracture load was observed. However, a clear difference in the fracture pattern has been identified.

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