1,721,054 research outputs found
Primary stability determination of implants inserted in sinus augmented sites: 1-step versus 2-step procedure.
No full textOBJECTIVES:
The aim of this study was to evaluate the primary stability of implants placed immediately after a sinus lift, compared with implants placed in the area treated with a sinus lift 6 months before.
MATERIAL AND METHODS:
Patients with a residual bone height of at least 4 mm were treated with a 1-stage procedure (group A) and patients with a residual bone height < 4 mm with a 2-stage approach (group B). Sinus lift was always performed with 50% autogenous bone and 50% deproteinized bovine bone mineral. Data recorded included maximum insertion torque (IT), resonance frequency analysis (RFA) values, and bone density, length, and diameter. It was recorded whether an implant was removed within 6 months after insertion.
RESULTS:
Fourteen patients were included in group A and 16 patients in group B; 96 implants were inserted. Mean IT was 23.77 ± 12.63 N·cm in group A and 26.48 ± 20.80 N·cm in group B. Mean RFA was 65.25 ± 4.45 implant stability quotient (ISQ) in group A and 67.92 ± 10.99 ISQ in group B. No statistically significant differences were found. All implants were osseointegrated.
CONCLUSIONS:
The results show that the implants studied can obtain a sufficient primary stability in both clinical situations without statistically significant differences
Parallel screw cylinder implants: Comparative analysis between immediate loading and two-stage healing of 1005 dental implants with a 2-year follow up
No full textBACKGROUND: Recently, several authors have focused on the possibility of an immediate functional loading of dental implants to minimize the delay between surgical and prosthetic phases. PURPOSE: The aim of this study was a reevaluation of the XiVE dental implant (Dentsply-Friadent, Mannheim, Germany) with: (1) a longer follow-up period; (2) a higher number of fixture; and (3) a proper statistical method. MATERIALS AND METHODS: In July 2001 and December 2002, 371 patients (180 males and 191 females; ages ranging from 17 to 83; mean age, 53 years) were consecutively enrolled in this study. In 371 patients, a total of 1,005 XiVE dental implants were distributed as follows: 484 immediately loaded implants (test group) were inserted in 130 patients, whereas 521 unloaded implants were inserted in 241 patients (control group). RESULTS: The implant survival was 98.7 and 99.4\% in immediate loading and control group, respectively. Univariate analysis showed no statistically significant difference between the two groups. CONCLUSION: In a previous report, we showed that immediate loading offered a predictable and reliable procedure also for XiVE implants, at least in the short period. In this study, we confirmed the results of the previous study and added information regarding the survival rate and marginal bone level stability with a 2-year follow up
Influence of Stepped Osteotomy on Primary Stability of Implants Inserted in Low-Density Bone Sites: An In Vitro Study.
No full textThe aims of this study were to evaluate the ability of a stepped osteotomy to improve dental implant primary stability in low-density bone sites and to investigate possible correlations between primary stability parameters. The study was performed on fresh humid bovine bone classified as type III. The test group consisted of 30 Astra Tech EV implants inserted following the protocol provided by the manufacturer. The first control group consisted of 30 Astra Tech EV implants inserted in sites without the underpreparation of the apical portion. The second control group consisted of 30 Astra Tech TX implants inserted following the protocol provided by the manufacturer. Implant insertion was performed at the predetermined 30 rpm. The insertion torque data were recorded and exported as a curve; using a trapezoidal integration technique, the area underlying the curve was calculated: this area represents the variable torque work (VTW). Peak insertion torque (pIT) and resonance frequency analysis (RFA) were also recorded. A Mann-Whitney test showed that the mean VTW was significantly higher in the test group compared with the first control and second control groups; furthermore, statistical analysis showed that pIT also was significantly higher in the test group compared with the first and second control groups. Analyzing RFA values, only the difference between the test group and second control group showed statistical significance. Pearson correlation analysis showed a very strong positive correlation between pIT and VTW values in all groups; furthermore, it showed a positive correlation between pIT and RFA values and between VTW and RFA values only in the test group. Within the limitations of an in vitro study, the results show that stepped osteotomy can be a viable method to improve implant primary stability in low-density bone sites, and that, when a traditional osteotomy method is performed, RFA presents no correlation with pIT and VTW
Immediate loaded dental implants: comparison between fixtures inserted in postextractive and healed bone sites
No full textImmediate loaded dental implants: Comparison between fixtures inserted in postextractive and healed bone sites
No full textIn the last two decades, several investigators have reported immediate placement of dental implants into extraction sockets achieving excellent results with a two-stage surgical procedure. Recently, immediate loading (IL) has become an emerging technique because it has been documented to be a successful and time-saving procedure. Regarding the possibility of immediate/early loading of implants placed in fresh extraction sockets, few reports are available. In addition, they are based on limited series with short follow up. Thus, we decided to perform a retrospective study on a large series of postextractive IL implants. From January 1995 to October 2004, 416 IL fixtures were placed immediately after extraction and 658 IL fixtures in healed sites. The mean follow up is 3 years. Multiple implant systems were used. Because only eight of 1,074 implants were lost (i.e., survival rate, 99.3\%) and no statistical differences were detected among the studied variables, no or reduced marginal bone loss was considered as an indicator of success rate to evaluate the effect of several host-, surgery-, and implant-related factors. A general linear model was then performed to detect those variables statistically associated with marginal bone loss. Only eight of 1,074 implants were lost (i.e., survival rate, 99.3\%) and no differences were detected among the studied variables. On the contrary, the general linear model showed that younger age (cutoff, 55 years) and harder bone are related to a lower delta insertion abutment junction (or marginal bone loss) and thus a better outcome. We demonstrated that postextractive IL implants have a high survival rate and success rate that are similar to those reported in previous studies of two-stage procedures or in IL implants inserted in healed bone. Poor bone quality and older age correlate with a slight higher bone resorption
Immediately loaded titanium implants with a porous anodised surface with at least a 36 months follow-up
No full textBackground: Results from some studies clearly suggest that immediate loading can achieve equal success rates as those found in delayed or unloaded implants. There is still a lack of knowledge about the role of surface oxide properties during the peri-implant bone healing processes.
Purpose: The aim of this study was a clinical follow-up study of immediately loaded implants with a porous anodized surface.
Materials and Methods: A total of 142 TiUnite(TM) (Nobel Biocare, Goteborg, Sweden) implants were inserted from January to September 2001. All implants have been used in fixed restorations. Fifty implants were inserted in completely edentulous mandibles, and 69 implants were inserted in completely edentulous maxillae. All 119 implants were subjected to immediate functional loading (IFL) (immediate restoration with full occlusal contact). The other 23 implants, inserted in 12 patients, underwent immediate nonfunctional loading (INFL) (immediate restoration without occlusal contact) in different anatomical configurations (single tooth, small bridges in the anterior mandible, anterior maxilla, and posterior maxilla). All 142 implants have been followed for at least 3 years.
Results: All implants appeared to be osseointegrated from a clinical and radiographic point of view. No failures were observed in the IFL and INFL groups. The implant success was 100%. The mean marginal bone loss was 0.8 and 1.0 mm at 12 and 36 months, respectively.
Conclusions: Implants with a porous anodized surface appear to work well under an immediate loading state in the long term
Regeneration of the alveolar crest using titanium micromesh with autologous bone and a resorbable membrane.
No full textThe conometric concept: Coupling connection for immediately loaded titanium-reinforced provisional fixed partial dentures-a case series
No full textThe aim of this prospective study was to demonstrate the feasibility of the conic coupling connection as a novel approach for the retention of immediately loaded, titanium-reinforced, temporary fixed partial restorations. The patients received a fixed, immediate partial restoration, attached using the conic coupling connection to two implants placed in a fresh extraction socket. Changes in marginal peri-implant bone level or probing depth measurements, biologic or technical complications, and any other adverse event were recorded at yearly follow-ups up to 3 years after implantation. A total of 78 implants placed in 39 patients reached the 3-year follow-up. A trend of bone overgrowth over the implant platform (mean: 0.2 mm) and a complete fill of the vertical gap between the implant platform level and the first point of contact of the bone with the implant surface was seen after the 6-month follow-up. No disconnection of any prosthesis was noted during 3 years of full occlusal function. The results of this study suggest that titanium-reinforced, temporary partial restorations with conic coupling retention supported by immediate implants provide a successful, cost-effective treatment modality
Immediately loaded short implants: Analysis of a case series of 133 implants
No full textOBJECTIVE: To perform a retrospective study on the success of immediately loaded short implants (ie, length 3.75 mm) and longer (length = 10 mm) implants were related to a lower delta insertion abutment junction (or marginal bone loss) and thus a better outcome. CONCLUSION: Immediately loaded short implants had a high survival rate and success rate similar to those reported in previous studies of 2-stage procedures. Immediate loading of short implants can be considered a reliable technique, although a higher marginal bone loss was to be expected when narrow (diameter < or = 3.75 mm) and shorter (length < 10 mm) implants were used
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