Clinical and Radiological Evaluation of Marginal Bone Loss around Dental Implants Restored with Zirconium vis-à-vis Porcelain Fused to Metal: An In Vivo Study

Abstract Introduction Marginal bone level is the criterion for implant success. Patient expectations for more natural looking implant restorations created the need to restore implants with more esthetically pleasing materials like Zirconia rather than conventional porcelain-fused to-metal (PFM) crowns. The aim of this study was to evaluate marginal bone loss around dental implants clinically and radiographically when restored with Zirconia and PFM prosthesis. Materials and Methods Two groups (control and test) were formed with 14 patients each. In the control group, the subjects were rehabilitated with PFM crowns and in the test group, the subjects were rehabilitated with Zirconia crowns. Rehabilitation was done after the healing period of 3 months. Radiographic evaluation was done at regular (baseline, 3rd, 6th, and 12th month) intervals. Results The results were statistically analyzed. Keeping in mind the limitations of the study, it was revealed that the difference in the crestal bone resorption in both the groups was not significant.

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The Association of the One-Abutment at One-Time Concept with Marginal Bone Loss around the SLA and Platform Switch and Conical Abutment Implants

Journal of Clinical Medicine ◽

10.3390/jcm11010074 ◽

2021 ◽

Vol 11 (1) ◽

pp. 74

Author(s):

Nasreen Hamudi ◽

Eitan Barnea ◽

Evgeny Weinberg ◽

Amir Laviv ◽

Eitan Mijiritsky ◽

...

Keyword(s):

Bone Loss ◽

Test Group ◽

Mucosal Barrier ◽

Control Group ◽

X Rays ◽

Marginal Bone Loss ◽

Bone Level ◽

The Difference ◽

The One

Objectives: Repeated abutment disconnection/reconnection may compromise the mucosal barrier and result in crestal bone level changes. The clinical significance of this phenomenon is not yet clear, as most studies on this topic are short-term. Therefore, the aim of the present study was to evaluate the influence of abutment disconnections and reconnections on peri-implant marginal bone loss over a medium-term follow-up period. Material and methods: Twenty-one patients (6 men and 15 women) with a mean age 66.23 ± 9.35 year at the time of implant placement were included. All patients who received two adjacent nonsubmerged implants were randomly assigned into one of the two groups: definitive multiunit abutments (DEFs) connected to the implant that were not removed (test group) or healing abutments (HEAs) placed at surgery, which were disconnected and reconnected 3–5 times during the prosthetic phase (control group). Peri-implant marginal bone levels (MBL) were measured through periapical X-rays images acquired immediately after the surgery (baseline), at 4–7 months immediately after prosthetic delivery, and at 1-year and 3-year follow-up visits. Results: No implant was lost or presented bone loss of more than 1.9 mm during the 3-year follow-up; thus, the survival and success rate was 100%. Peri-implant mucositis was noticed in 38.1% DEFs and 41.9% of HEAs at the 3-year follow-up assessment. At the end of 3 years, the MBL was −0.35 ± 0.69 mm for participants in the DEFs group and −0.57 ± 0.80 mm for the HEAs group, with significant statistical difference between groups. Conclusions: Immediate connection of the multiunit abutments reduced bone loss in comparison with 3–5 disconnections noted in the healing abutments 3 years after prosthetic delivery. However, the difference between the groups was minimal; thus, the clinical relevance of those results is doubtful.

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Peri-Implant Behavior of Sloped Shoulder Dental Implants Used for All-On-Four Protocols: An Histomorphometric Analysis in Dogs

Materials ◽

10.3390/ma11010119 ◽

2018 ◽

Vol 11 (1) ◽

pp. 119 ◽

Cited By ~ 1

Author(s):

Jose Calvo Guirado ◽

Aldo Lucero-Sánchez ◽

Ana Boquete Castro ◽

Marcus Abboud ◽

Sergio Gehrke ◽

...

Keyword(s):

Soft Tissue ◽

Bone Loss ◽

Dental Implants ◽

Test Group ◽

Control Group ◽

Histomorphometric Analysis ◽

Tissue Thickness ◽

Marginal Bone Loss ◽

Soft Tissue Thickness ◽

The Mean

The aim of this study was to evaluate the soft tissue thickness and marginal bone loss around dental implants with sloped micro-threaded shoulder (30° angle) in comparing with conventional design, inserted 30° degrees angulated in post extraction sockets and immediate loaded with temporary prosthesis simulating the all-on-four protocol. Materials and Methods: Six fox hound dogs received forty-eight post extraction dental implants with the different diameter and length (Medentika, Germany), but with different neck configurations. Two group of implants were inserted 1mm subcrestal. Control group has a micro-threaded neck and the Test group has a sloped microthreaded neck. Immediate loading was applied using a constructed metallic structure. After three months, soft and hard tissue levels were assessed by histomorphometric analysis. Results: The mean soft tissue thickness (STT) was 2.5 ± 0.2 mm for the Control group and 3.3 ± 0.3 mm for Test group (p = 0.036), meanwhile the mean marginal bone loss (MBL) was 1.53 ± 0.34 mm for Control group and, 1.62 ± 0.22 mm for Test group (p > 0.05). Conclusions: Within the limitations of this experimental model in dogs, the findings showed that dental implants with microthreaded and microthreaded sloped necks installed in immediate post extraction sites with immediate load, presented a comparable perimplant tissue behavior.

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Marginal Bone Loss Around Implants Supporting Fixed Restorations

Journal of Oral Implantology ◽

10.1563/aaid-joi-d-10-00018 ◽

2011 ◽

Vol 37 (5) ◽

pp. 549-558 ◽

Cited By ~ 18

Author(s):

Emre Mumcu ◽

Hakan Bilhan ◽

Ali Cekici

Keyword(s):

Bone Loss ◽

Dental Implants ◽

Radiographic Evaluation ◽

Marginal Bone Loss ◽

Implant Size ◽

Bone Level ◽

Marginal Bone Level ◽

Implant Length

A key criterion of success following dental implants is the marginal bone level. Long-term clinical and radiographic evaluation is necessary to test the results of in vitro studies investigating how cantilevering of restorations or implant size affect bone level changes around implants. There is no consensus on the effect of several variables such as age, gender, implant size, and cantilever prostheses on marginal bone levels around fixed dentures supported by dental implants. Patients who received cemented, fixed restorations supported by implants and who were examined in routine recall sessions 6, 12, 24, and 36 months after loading were included in the study group. Comparative bone level measurements were obtained from images of radiographs at ×20 magnification using the CorelDraw 11.0 software program. Statistical analysis was performed using the Student t test and 1-way analysis of variance. In the 36-month observation period, there were no incidences of implant failure, excessive bone loss around implants, or peri-implant inflammation. One hundred twenty-six implants in 36 patients were evaluated, and the effect of several factors on marginal bone loss (MBL) during the 36 months after loading was analyzed statistically. There was no significant relationship between MBL and implant length or diameter, whereas age, gender, and cantilevers affected bone loss rates. MBL was elevated in older and female patients as well as in patients who received cantilevers. In cases of limiting anatomic conditions, short and/or narrow implants should be preferred over cantilever extensions.

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Clinical outcomes of dental implants placed in the same region where previous implants failed due to peri-implantitis: a retrospective study

International Journal of Implant Dentistry ◽

10.1186/s40729-021-00392-1 ◽

2021 ◽

Vol 7 (1) ◽

Author(s):

Eduardo Anitua ◽

Adriana Montalvillo ◽

Asier Eguia ◽

Mohammad Hamdan Alkhraisat

Keyword(s):

Retrospective Study ◽

Survival Rate ◽

Bone Loss ◽

Clinical Outcomes ◽

Dental Implants ◽

Demographic Data ◽

High Survival ◽

Implant Survival ◽

Marginal Bone Loss ◽

Bone Level

Abstract Purpose There is paucity in the studies that assess dental implants replacing failed dental implants due to peri-implantitis. This study aims to evaluate the clinical outcomes of these implants in terms of implant survival and marginal bone loss. Methods Patients in this retrospective study were selected if having one or more implants removed due to peri-implantitis and the placement and loading of dental implants in the same region from April 2010 to December 2019. Information was collected about the patient's demographic data, implant dimensions, surgical and prosthetic variables. Changes in peri-implant bone level, cumulative implant survival rate and technical complications were assessed. Results Three hundred and eighty one dental implants in 146 patients that were placed in the same position or one-tooth position mesially/distally to the site of explantation were included. The patients' mean age was 63 ± 10 years. Ninety seven patients were females and 49 were males. After a mean follow-up of 34 ± 17 months, two implants failed. The cumulative survival rate was 99%. The marginal bone loss was −0.1 ± 0.6. Immediate or delay replacement of the failed implant did not affect implant survival or marginal bone stability. All the prostheses were screw-retained and presented the following complications: ceramic chipping (3 events), resin tooth fracture (1 event) and prosthetic screw loosening (1 event). Conclusions Dental implants replacing failed implants due to peri-implantitis would be an option in the management of peri-implantitis. They showed high survival rate and marginal bone stability.

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Assessment of Marginal Bone Loss around Platform-Matched and Platform-Switched Implants - A Prospective Study

Brazilian Dental Journal ◽

10.1590/0103-6440201601160 ◽

2016 ◽

Vol 27 (6) ◽

pp. 712-716 ◽

Cited By ~ 1

Author(s):

Newton Sesma ◽

Carlos Garaicoa-Pazmino ◽

Piero R. Zanardi ◽

Eliseo P. Chun ◽

Dalva Cruz Laganá

Keyword(s):

Bone Loss ◽

Positive Impact ◽

Test Group ◽

Control Group ◽

Bone Modeling ◽

Radiographic Assessment ◽

Marginal Bone Loss ◽

Implant Placement ◽

Platform Switching ◽

Implant Loading

Abstract The aim of the present study was to perform a software-assisted radiographic assessment of the effect of platform-switching on marginal bone loss (MBL) around dental implants. Forty patients requiring a dental implant in non-grafted partially edentulous mandibles were enrolled and categorized into implants receiving a platform-matched abutment (control group) or implants with a platform-switched abutment (test group). Standardized digital periapical radiographs were taken at the time of implant placement (T0), at implant loading (T1) and 1-year after functional loading (T2). Software-assisted radiographic assessment of the MBL horizontal, vertical and area changes was performed and compared between time intervals (T1-T0, T2-T1 and T2-T0). Mean radiographic horizontal MBL (hMBL) and vertical MBL (vMBL) from implant placement to 1-year after implant loading (T2-T0) were significantly increased around platform-matched when compared to platform-switched abutments (1.04 mm vs 0.84 mm, p<0.05) and (0.99 mm vs 0.82 mm, p<0.05), respectively. Additionally, bone loss area (BLa) was greater (0.77 mm2 vs 0.63 mm2; p<0.05) for platform-matched compared to platform-switched abutments. Platform-switching has a positive impact upon the amount of bone modeling after loading implants with internal hexagon connection.

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Trends of Implant Placement in Relation to Crestal Bone Level in a Private Dental Institute

International Journal of Research in Pharmaceutical Sciences ◽

10.26452/ijrps.v11ispl3.2944 ◽

2020 ◽

Vol 11 (SPL3) ◽

pp. 358-362

Author(s):

Rinieshah Nair R Baskran ◽

Rajendra Prabhu Abhinav ◽

Murugaiyan Arun ◽

Balaji Ganesh S

Keyword(s):

Bone Loss ◽

Dental Implants ◽

P Value ◽

Marginal Bone Loss ◽

Oral Rehabilitation ◽

Implant Placement ◽

Significant Difference ◽

Bone Level ◽

Natural Dentition ◽

Bone Height

Dental implants provide a strong foundation for fixed or removable prosthetic teeth that are made to match natural dentition. It has become an ideal method of oral rehabilitation after missing natural dentition has been recognised as a reliable tool for dental reconstruction and aesthetics. Marginal bone loss is characterized by a reduction in bone loss is characterized by a reduction in bone level both vertically and horizontally. The levels at which dental implants are placed include sub-crystal, equi-crestal, and supra-crestal. The crestal levels affect bone height significantly. Failure to do so will lead to peri-implant bone loss which will affect the implant function and ultimately implant failure. A retrospective study was conducted based on a university setting. 615 patients with 1141 implant sites were reviewed from June 2019 to March 2020. Excel tabulation and SPSS analysis were done for data analysis. There was a statistically significant difference between the variables that included tooth region, crestal relation and site (jaw)—[p-value<0.05] The most common crestal relation of implant placement is equi-crestal implant placement. The assessment of trends of implant placement in relation to crestal bone level shows that equi-crestal implant is the most preferred crestal relation of implant placement in Saveetha Dental College.

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Clinical, Histomorphometric and Radiographic Evaluation of Dental Extraction Sockets Treated with Autologous Stem Cells

Blood ◽

10.1182/blood.v116.21.2398.2398 ◽

2010 ◽

Vol 116 (21) ◽

pp. 2398-2398

Author(s):

André Pelegrini ◽

Maria Elvira P Corrêa ◽

Thiago Oliveira ◽

Carmino De Souza ◽

José Francisco Marques

Keyword(s):

Stem Cells ◽

Bone Marrow ◽

Bone Loss ◽

Dental Implants ◽

Tooth Extraction ◽

Alveolar Bone ◽

Test Group ◽

Autologous Bone Marrow ◽

Control Group ◽

Autologous Bone

Abstract Abstract 2398 Introduction: Autologous bone marrow has mesenchymals stem cells that can differentiate into osteoblasts. Therefore, the use of these cells in bone reconstruction therapy is becaming promising. Purpose: The first aim of this study was to evaluate the potential of autologous bone marrow graft aspirate containing mesenchymal stem cells in preserving the alveolar ridges following tooth extraction. A second aim was to clinically and radiographically evaluate the outcomes of dental implants installed in the healed sockets after one year in function. Methods: 13 healthy patients requiring upper anterior teeth extractions were enrolled in this study. They were randomized into two groups: Test group: 7 patients (n = 15 teeth); Control group: 6 patients (n = 15 teeth). 5 ml of autologous bone marrow from the iliac posterior crest were collected by haematologists immediately before the extractions and it was placed in alveolar sockets right after the teeth extractions in the test group. Nothing was grafted in the control sites. Following tooth extraction and evaluation of a buccal full-thickness flap, titanium screws were positioned throughout the buccal to the palatal plate and were used as reference points for measuring purposes. After 6 months, the sites were re-opened and bone loss measurements for thickness and height were taken. Additionally, prior to implant placement, bone cores were harvested and prepared for histologic and histomorphometric evaluation. Data of clinical probing and radiographic analysis were done in all sites after 1 year of follow up. Results: The test group had better results in preserving alveolar ridges for thickness showing 1.14+0.87mm of bone loss compared with the control group that showed 2.46+0.4mm (P<0.05). The test group showed also a less height of bone loss on the buccal plate, 0.62+0.51 and 1.17+0.26mm, respectively (P<0.05). Complimentary procedures were required before install the implants in five sites in the control group, but not, in the test group. The histomorphometric analysis showed similar amounts of mineralized bone in both control and test groups, 42.87+11.33% and 45.47+7.21% respectively (P>0,05). The results of 1 year clinical probing follow-up showed deeper probing depths around the control group dental implants when compared to the test group, 4.45+1.58mm and 3.78+1.58mm, respectively (P< 0,05). Radiographic analysis showed more marginal bone level loss in the control group when compared to test group, 3.44+3.39mm and 1.05+0.9mm, respectively (P<0,05). Conclusion: These findings suggest that the autologous bone marrow graft can contribute to alveolar bone repair after tooth extraction and can also minimize the dental implants attachment loss. This study indicate that the participation of mesenchymal stem cell in the alveolar bone healing should be better understanding to explain this process of repairement. Disclosures: No relevant conflicts of interest to declare.

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One-Abutment One-Time Effect on Peri-Implant Marginal Bone: A Prospective, Controlled, Randomized, Double-Blind Study

Materials ◽

10.3390/ma14154179 ◽

2021 ◽

Vol 14 (15) ◽

pp. 4179

Author(s):

Filipe Moreira ◽

Salomão Rocha ◽

Francisco Caramelo ◽

João P. Tondela

Keyword(s):

Bone Loss ◽

Statistical Significance ◽

Test Group ◽

Primary Stability ◽

Control Group ◽

Double Blind Study ◽

Double Blind ◽

Implant Placement ◽

Bone Level ◽

The Mean

Objective: To evaluate the peri-implant hard tissue change at 6 and 12 months after implant placement between definitive abutment placed at the same time of implant surgery, never removing it, and healing abutment disconnected and reconnected three times until the placement of the final rehabilitation. Material and methods: Each partial edentulous patient could receive between 1 and 4 platform-switched implants in the posterior regions. If the implants had primary stability—implant stability quotient (ISQ) equal to or greater than 50, they were randomized to the test group with the abutment inserted at the same time of implant placement (DA) or to the control group, receiving a healing abutment (PA). At 6 and 12 months after surgery, data related with vertical bone level changes (primary outcome) and other clinical parameters (implant mobility, bleeding on probing, probing depth, plaque index) were assessed. Results: 53 implants were included in the trial and completed 12 months follow-up (overall survival rate: 100%). All implants achieved primary stability, with an average ISQ value of 80.9 on the day of surgery. From surgery to 6 months, the mean bone loss was 0.14 ± 0.18 mm for the DA group and 0.23 ± 0.29 mm for the PA group, without statistical significance difference. Between 6 and 12 months, the mean bone loss was 0.14 ± 0.21 mm for the DA group and 0.21 ± 0.27 mm for the PA group, also without statistical significance between the two groups. There were no statistically significant differences (p = 0.330) in total bone loss after 12 months between the control and the study groups. Conclusions: The one abutment one time protocol has at least an equivalent effect on the peri-implant bone level changes when compared with the use of healing abutments that are disconnected and reconnected at least three times.

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Marginal Bone Remodeling around healing Abutment vs Final Abutment Placement at Second Stage Implant Surgery: A 12-month Randomized Clinical Trial

The Journal of Contemporary Dental Practice ◽

10.5005/jp-journals-10024-1795 ◽

2016 ◽

Vol 17 (1) ◽

pp. 7-15 ◽

Cited By ~ 3

Author(s):

Ronald Younes ◽

Antoine Berberi ◽

Nabih Nader ◽

Maissa Aboulhosn ◽

Cordahi Manal

Keyword(s):

Clinical Trial ◽

Bone Loss ◽

Randomized Clinical Trial ◽

Bone Remodeling ◽

Test Group ◽

Control Group ◽

Marginal Bone Loss ◽

Second Stage ◽

Stable Connection

ABSTRACT Background The periimplant bone level has been used as one of the criteria to assess the success of dental implants. It has been documented that the bone supporting two-piece implants undergoes resorption first following the second-stage surgery and later on further to abutment connection and delivery of the final prosthesis. Objective The aim of this multicentric randomized clinical trial was to evaluate the crestal bone resorption around internal connection dental implants using a new surgical protocol that aims to respect the biological distance, relying on the benefit of a friction fit connection abutment (test group) compared with implants receiving conventional healing abutments at secondstage surgery (control group). Materials and methods A total of partially edentulous patients were consecutively treated at two private clinics, with two adjacent two-stage implants. Three months after the first surgery, one of the implants was randomly allocated to the control group and was uncovered using a healing abutment, while the other implant received a standard final abutment and was seated and tightened to 30 Ncm. At each step of the prosthetic try-in, the abutment in the test group was removed and then retightened to 30 Ncm. Horizontal bone changes were assessed using periapical radiographs immediately after implant placement and at 3 (second-stage surgery), 6, 9 and 12 months follow-up examinations. Results At 12 months follow-up, no implant failure was reported in both groups. In the control group, the mean periimplant bone resorption was 0.249 ± 0.362 at M3, 0.773 ± 0.413 at M6, 0.904 ± 0.36 at M9 and 1.047 ± 0.395 at M12. The test group revealed a statistically significant lower marginal bone loss of 20.88% at M3 (0.197 ± 0.262), 22.25% at M6 (0.601 ± 0.386), 24.23% at M9 (0.685 ± 0.341) and 19.2% at M9 (0.846 ± 0.454). The results revealed that bone loss increased over time, with the greatest change in bone loss occurring between 3 and 6 months. Alveolar bone loss was significantly greater in the control condition than the test condition. Conclusion The results of this prospective study demonstrated the benefit of placing a prosthetic component with a stable connection at second-stage surgery, in terms of reduced marginal bone remodeling when compared with conventional procedure. Clinical significance. The use of a stable connection in a healing component during try-in stages prior to final restoration placement leads to less periimplant marginal bone loss. How to cite this article Nader N, Aboulhosn M, Berberi A, Manal C, Younes R. Marginal Bone Remodeling around healing Abutment vs Final Abutment Placement at Second Stage Surgery: A 12-month Randomized Clinical Trial. J Contemp Dent Pract 2016;17(1):7-15.

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The Difference of Marginal Bone Preservation between Dental Implants with Non-Threaded or Micro-Threaded Collar Designs

Coatings ◽

10.3390/coatings11101232 ◽

2021 ◽

Vol 11 (10) ◽

pp. 1232

Author(s):

Mazen Almasri

Keyword(s):

Bone Loss ◽

Dental Implants ◽

P Value ◽

Marginal Bone Loss ◽

Significant Difference ◽

Bone Preservation ◽

The Mean ◽

The Difference ◽

Implant System ◽

Metal Show

This study analyzes the marginal bone loss (MBL) among dental implants characterized with non-threaded collar design (NT) when compared to the more classic micro-threaded collar design (MC) as such might reflect the future dentogengival esthetics, implant metal show, and mucositis. A total of 112 patients who received 311 implants have been included in the study and analyzed for their postoperative MBL using sequential periapical radiographs. The prevalence of postoperative peri-implant mucositis was recorded as well. The periapical radiographic comparison was performed between the immediate postoperative record and at the 24-month recall visit. Among the 311 implants, 124 (39.9%) had NT implants, and 187 (60.1%) had MC implants. Out of the 112 patients, 37 (44.6%) were females, and 10 (34.5%) were males included in the NT group. In contrast, 46 (55.4%) females and 19 (65.5%) males were in the MC group. The mean age among the two groups was 41.43 ± 15.900 and 46.68 ± 16.070, respectively. In contrast, the mean MBL among the groups were 0.544 ± 0.7129 and 0.061 ± 0.2648, respectively. The change in MBL was not positively correlated with gender (p-value = 0.154) or age (p-value = 0.115) in both groups. However, there was a significant difference (p-value = 0.001, X2 = 62.796, Df = 4) of MBL between the two implant systems themselves. The MBL was higher in people implanted with the NT system when compared to MC. Therefore, the MC implant system can be a better choice for marginal bone preservation, especially in restoring esthetically demanding areas in the mouth.

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