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

2016 ◽  
Vol 17 (1) ◽  
pp. 7-15 ◽  
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.

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

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.

Does Apico-Coronal Implant Position Influence Peri-Implant Marginal Bone Loss? A 36-Month Follow-Up Randomized Clinical Trial

2019 ◽  
Vol 77 (3) ◽  
pp. 515-527 ◽  
Author(s):  
Hilario Pellicer-Chover ◽  
Maria Peñarrocha-Diago ◽  
Amparo Aloy-Prosper ◽  
Luigi Canullo ◽  
Miguel Peñarrocha-Diago ◽  
...  
Keyword(s):  
Clinical Trial ◽  
Bone Loss ◽  
Randomized Clinical Trial ◽  
Marginal Bone Loss ◽  
Implant Position

scholarly journals 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

2020 ◽  
Vol 08 (01) ◽  
pp. 17-21
Author(s):  
Udey Singh Wirring ◽  
Tarun Kalra ◽  
Manjit Kumar ◽  
Ajay Bansal ◽  
Aquib Javaid
Keyword(s):  
Bone Loss ◽  
Dental Implants ◽  
Test Group ◽  
Radiographic Evaluation ◽  
Control Group ◽  
Marginal Bone Loss ◽  
Zirconia Crowns ◽  
Bone Level ◽  
The Difference

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.

scholarly journals Influence of Biologically Oriented Preparation Technique on Peri-Implant Tissues; Prospective Randomized Clinical Trial with Three-Year Follow-Up. Part I: Hard Tissues

2019 ◽  
Vol 8 (12) ◽  
pp. 2183 ◽  
Author(s):  
Rubén Agustín-Panadero ◽  
Naia Bustamante-Hernández ◽  
María Fernanda Solá-Ruíz ◽  
Álvaro Zubizarreta-Macho ◽  
Antonio Fons-Font ◽  
...  
Keyword(s):  
Clinical Trial ◽  
Bone Loss ◽  
Randomized Clinical Trial ◽  
Preparation Technique ◽  
Crown Group ◽  
Clinical Behavior ◽  
Prospective Randomized Clinical Trial ◽  
Hard Tissues ◽  
Functional Loading

Purpose: The objective of this prospective randomized clinical trial (RCT) was to analyze and compare the clinical behavior of three types of prosthesis supported by single implants in the posterior region after three years functional loading. Materials and Methods: Seventy-five implants were divided into three groups according to the type of prosthetic restoration: screw-retained crown (Group GS); cemented crown without finishing line (biologically oriented preparation technique) (Group GBOPT); and conventional cemented crown with finishing line (Group GCC). The clinical behavior of each restoration type was analyzed after 3 years functional loading by analyzing radiographic peri-implant bone loss. Results: GBOPT obtained the least bone loss (p < 0.01) in comparison with GS and GCC. Conclusions: Bone loss around implants is related to the type of prosthetic restoration it supports, whereby cemented BOPT crowns present less bone loss.

Influence of abutment disconnection on peri‐implant marginal bone loss: A randomized clinical trial

2020 ◽  
Vol 31 (4) ◽  
pp. 341-351 ◽  
Author(s):  
Luciano de Freitas Guimarães Praça ◽  
Renata Cordeiro Teixeira ◽  
Rodrigo Otavio Rego
Keyword(s):  
Clinical Trial ◽  
Bone Loss ◽  
Randomized Clinical Trial ◽  
Marginal Bone Loss

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

2016 ◽  
Vol 27 (6) ◽  
pp. 712-716 ◽  
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.

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

Materials ◽  
2018 ◽  
Vol 11 (1) ◽  
pp. 119 ◽  
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.

Effectiveness of a conversational chatbot in the smartphone to cease smoking in the adult population: pragmatic, controlled, randomized clinical trial in primary care (Dejal@). (Preprint)

2021 ◽  
Author(s):  
EDUARDO OLANO-ESPINOSA ◽  
Jose Francisco Avila-Tomas ◽  
Cesar Minue-Lorenzo ◽  
Blanca Matilla Pardo ◽  
Encarnación Serrano-Serrano ◽  
...  
Keyword(s):  
Primary Care ◽  
Clinical Trial ◽  
Clinical Practice ◽  
Randomized Clinical Trial ◽  
Control Group ◽  
Evidence Based ◽  
Intention To Treat ◽  
Usual Clinical Practice ◽  
Treat Analysis

BACKGROUND The magnitude and severity of smoking, the benefits of quitting, and the existence of effective and efficient interventions make it a priority problem. Health professionals intervene less than they should, and the most effective interventions are more expensive, require specific training and more time, which is a disadvantage for the service provider and for the accessibility of the services. Information and communication technologies avoid these problems thanks to their accessibility, privacy, customization possibilities, access to social support, and scalability. OBJECTIVE To assess the effectiveness of an evidence-based intervention to cease smoking via a chatbot in the smartphone compared to usual clinical practice in primary care. METHODS Pragmatic randomized clinical trial in 34 primary healthcare centers within the Madrid Health Service (Spain). Smokers over 18 years of age who attended on-site consultation and accepted help to quit tobacco were recruited by their doctor or nurse and randomly allocated to receive usual care (control group, CG) or an evidence-based chatbot intervention (intervention group, IG). The interventions in both arms were based on the 5A´s by the US clinical practice guideline, which combines behavioral and pharmacological treatments and is structured in several follow-up appointments. The primary outcome was continuous abstinence from smoking that was biochemically validated after 6 months by the collaborators. The outcome analysis was blinded to allocation of subjects although participants were unblinded to group assignment. An intention-to-treat analysis, entering the basal observation carried forward in cases of missing data, and logistic regression models with robust estimators were employed for assessing the primary outcomes. RESULTS The trial was conducted between October 1st of 2018 and March 31st of 2019. The sample comprised 513 patients (242 in the IG and 271 in the CG), with an average age of 49.8 years (SD 10.82) and gender ratio of 59.3% women and 40.7% men. Of them, 232 patients (45.2%) completed the follow-up, 104 (42.9%) in the IG and 128 (47.2%) in the CG. Main outcome: In the intention-to-treat analysis, the biochemically-validated abstinence rate at 6 months was higher in the IG with 26.03% (63/242) versus 18.82% (51/271) in the CG (odds ratio (OR)=1.52, 95% CI: 1.00–2.31, P=.05). After adjusting for basal CO-oxymetry and bupropion intake, no substantial changes were observed (OR=1.52, 95% CI 0.99–2.33 P= .053; pseudo R2=0.045). In the IG, 61.16% (148/242) of users accessed the chatbot, average bot-patient interaction time was 121 minutes (CI 95% 121.1–140.0), and average number of contacts was 45.56 (SD 36.32). CONCLUSIONS A treatment including a chatbot for helping in tobacco cessation was more effective than usual clinical practice in primary care. CLINICALTRIAL ClinicalTrials.gov, reference number NCT 03445507.

scholarly journals Clinical and Microbiological Efficacy of Pyrophosphate Containing Toothpaste: A Double-Blinded Placebo-Controlled Randomized Clinical Trial

2020 ◽  
Vol 8 (11) ◽  
pp. 1806
Author(s):  
Inpyo Hong ◽  
Hyun Gee Lee ◽  
Hye Lim Keum ◽  
Myong Ji Kim ◽  
Ui-Won Jung ◽  
...  
Keyword(s):  
Clinical Trial ◽  
Randomized Clinical Trial ◽  
Pathogenic Bacteria ◽  
Test Group ◽  
Amplicon Sequencing ◽  
Oral Microbiome ◽  
Plaque Index ◽  
Control Group ◽  
Placebo Control ◽  
Significant Difference

(1) Background: Dental calculus works as a niche wherein pathogenic bacteria proliferate in the oral cavity. Previous studies revealed the anticalculus activity of pyrophosphates, however there was no clinical study that evaluated microbiome changes associated with calculus inhibition. Therefore, the aim of this randomized clinical trial was to evaluate the calculus inhibition of pyrophosphate-containing toothpaste and its effect on oral microbiome changes. (2) Methods: Eighty subjects with a calculus index ≥2 on the lingual of the mandibular anterior tooth were randomly allocated to the test group that pyrophosphate-containing toothpaste was given to or the placebo control group. Full mouth debridement and standardized tooth brushing instruction were given before the allocation. Plaque index, gingival index, calculus index, probing depth, and bleeding on probing were measured at the baseline, and at 4, 8 and 12 weeks. Genomic DNA was extracted from the plaque samples collected at the baseline and at 12 weeks, and 16S ribosomal RNA gene amplicon sequencing was applied for microbiome analysis. (3) Results: None of the clinical parameters showed significant differences by visits or groups, except the plaque index of the test group, which reduced significantly between 4 and 12 weeks. A significant difference of microbiome between the baseline and 12 weeks was observed in the test group. Between baseline and 12 weeks, the proportion of Spirochetes decreased in the control group, and the proportions of Proteobacteria, Fusobacteria and Spirochetes in the phylum level and the proportions of Haemophilus, Fusobacterium and Capnocytophaga in the genus level decreased in the test group. In the test group, as plaque index decreased, Streptococcus increased, and Fusobacterium and Haemophilus parainfluenza decreased. (4) Conclusion: The use of pyrophosphate-containing toothpaste effectively inhibited the dysbiosis of the oral microbiome and the proliferation of pathogenic species in periodontal disease. Clinically, plaque formation in the pyrophosphate-containing toothpaste group was effectively decreased, however there was no significant change in calculus deposition.

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