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

Materials ◽  
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.

scholarly journals One Abutment One Time: A Multicenter, Prospective, Controlled, Randomized Study

2020 ◽  
Vol 17 (24) ◽  
pp. 9453
Author(s):  
José Vicente Ríos-Santos ◽  
Gregorio Tello-González ◽  
Pedro Lázaro-Calvo ◽  
Francisco Javier Gil Mur ◽  
Blanca Ríos-Carrasco ◽  
...  
Keyword(s):  
Bone Loss ◽  
Statistical Significance ◽  
Randomized Study ◽  
Study Groups ◽  
Control Group ◽  
Implant Stability ◽  
Chi Square ◽  
Implant Placement ◽  
Qualitative Variables ◽  
Bone Level

Aim: (PRIMARY) Assess the changes in bone level (6 and 12 months after implant placement) between the test (definitive abutment (DEF)) and control (healing abutment (HEA)) groups. (SECONDARY) Assess the changes in bone level (6 and 12 months after implant placement) between the 1 mm high abutment group and 2 mm abutment group. Evaluate changes in implant stability recorded with analysis of the resonance frequency (RFA) Osstell system, at 6 and 12 months after implant placement, between the control group (HEA) and test (DEF). For the DEF group, the abutment was placed at the time of the surgery and was never removed. For the HEA group, the abutment was removed three times during the manufacture of the crowns. The abutments used were 1 mm high (Subgroup A) and 2 mm high (Subgroup B). Materials and methods: A total of 147 patients were selected between 54.82 ± 11.92 years old. After implant placement, patients were randomly distributed in the DEF and HEA group. After the implant placement, a periapical radiograph was taken to assess the peri-implant bone level; the same procedure was carried out 6 and 12 months post-placement. To compare the qualitative variables between the groups (HEA/DEF), the Chi-square test was used; for quantitative (MANOVA). Results: After a year, the accumulated bone loss was 0.48 ± 0.71 mm for the HEA group and 0.36 ± 0.79 mm for the DEF group, without statistical significance. Differences were only found due to timing (time) between 0 and 6 months (=0.001) and 0 and 12 months (0.001), with no differences attributable to the study groups (DEF and HEA). The accumulated bone loss (1 year) was 0.45 ± 0.78 mm for the 1 mm abutment group and 0.41 ± 0.70 mm for the 2 mm abutment group (p = 0.02). No differences were observed in implant stability between groups. Conclusions: The “One Abutment—One Time” concept does not reduce peri-implant bone loss compared to the connection–disconnection technique. The height of the abutment does influence bone loss: the higher the abutment, the lower the bone loss.

OCT as a monitoring tool for assessment of the stage and severity of multiple sclerosis

2020 ◽  
Vol 1 (3) ◽  
pp. 179-182
Author(s):  
Yoav Yechezkel Pikkel ◽  
◽  
Vadim Igal ◽  
Yael Sara Pikkel Igal ◽  
Adi Nov-Sharabi ◽  
...  
Keyword(s):  
Multiple Sclerosis ◽  
Statistical Significance ◽  
Control Group ◽  
Double Blind Study ◽  
Monitoring Tool ◽  
Fiber Layer ◽  
Double Blind ◽  
Rnfl Thickness ◽  
Disability Status ◽  
The Mean

AIM: To identify a link between optical coherence tomography (OCT), length of multiple sclerosis (MS) and the expanded disability status scale (EDSS). METHODS: In a prospective double blind study, 29 patients with a diagnosis of MS were compared with 29 healthy patients, matched by age and sex. All participants underwent an OCT study and neurological EDSS test on the same day. RESULTS: The mean EDSS score was 3.2 in the MS group vs 0.03 in the control group, and the duration of MS is 11.7y. The mean retinal nerve fiber layer (RNFL) thickness was significantly thinner in those with MS (P<0.001). Correlation was found between duration of MS and RNFL thinning. EDSS and thinning of RNFL showed a tendency to correlate but without statistical significance.

The Effectiveness of Group Acceptance and Commitment Therapy and Cognitive Therapy on Alexithymia and Marital Boredom, Case study: Women Affected by Marital Infidelity in Mashhad, Iran

2022 ◽  
Author(s):  
Maryam Sadeghi ◽  
Naeimeh Moheb ◽  
Marziyeh Alivandi Vafa
Keyword(s):  
Cognitive Therapy ◽  
Analysis Of Covariance ◽  
Control Group ◽  
Double Blind Study ◽  
University Counseling Center ◽  
Double Blind ◽  
University Counseling ◽  
Acceptance And Commitment ◽  
Marital Infidelity ◽  
The Mean

Introduction: The aim of current paper was to compare the effectiveness of acceptance and commitment group therapy (ACT) and group cognitive therapy (GCT) on Alexithymia and marital boredom (MB) among women affected by marital infidelity in Mashhad. Method: This clinical trial was a double- blind study with a pretest-posttest design in which two intervention groups and one control group were investigated. The study performed on women who realized their spouse infidelity and referred to Azad University Counseling Center in Mashhad in 2018. The sample consisted of 30 women who were selected by purposive sampling and were randomly assigned to two intervention groups and a control group (n=10 per group). The intervention groups were put under ACT training (twelve 90-minute sessions) and GCT training (twelve 90-minute sessions), but the control group did not receive any intervention. Data was obtained by the Toronto Alexithymia Scale-20 and Pines Marital Boredom Scale and was analyzed by multivariate analysis of covariance with SPSS (version 22) software. Results: The results showed a significant reduction in the mean score of MB in the ACT group, also there was a significant reduction in the mean score of Alexithymia in the GCT group (P <0.05). So comparing both therapies, ACT was more influential on reducing marital boredom whereas GCT was more effective on reducing alexithymia. Conclusion: Although both intervention methods were effective on Alexithymia and Marital Boredom in women affected by marital infidelity, it was demonstrated that ACT and GCT have more effect on Marital Boredom and Alexithymia, respectively.

A Parallel-Group Comparison of Astemizole and Loratadine for the Treatment of Perennial Allergic Rhinitis

1997 ◽  
Vol 25 (4) ◽  
pp. 175-181 ◽  
Author(s):  
H Al-Muhaimeed
Keyword(s):  
Allergic Rhinitis ◽  
Statistical Significance ◽  
Double Blind Study ◽  
Perennial Allergic Rhinitis ◽  
Double Blind ◽  
Once Daily ◽  
Runny Nose ◽  
Parallel Group ◽  
The Mean ◽  
To Receive

The efficacy and safety of the two antihistamines, astemizole and loratadine, were compared in a double-blind study of 84 patients with perennial allergic rhinitis. Patients were randomized to receive orally either astemizole 10 mg once daily ( n = 40) or loratadine 10 mg once daily ( n = 44) for 1 week. No other antirhinitis medication was allowed during the study. By day 7 the mean daily symptom scores, recorded on diary cards, were lower in patients receiving astemizole than in those receiving loratadine for runny nose, itchy nose and sneezing, although not for blocked nose, and treatment differences only reached statistical significance for runny nose. After 7 days, 53.75% of patients on astemizole and 38.6% on loratadine were free of symptoms, and 87% of patients on astemizole described the treatment as good or excellent compared with 62% on loratadine. The present results suggest that astemizole may be more effective than loratadine in controlling symptoms of perennial allergic rhinitis.

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 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.

scholarly journals The Vertical Soft Tissue Thickness and Subcrestal Implant Placement as Factors for Peri-implant Crestal bone Stability

2021 ◽  
Vol 9 (D) ◽  
pp. 257-263
Author(s):  
Darko Veljanovski ◽  
Aneta Atanasovska-Stojanovska ◽  
Aleksandra Pivkova-Veljanovska ◽  
Eitan Mijiritsky ◽  
Curd Bollen
Keyword(s):  
Soft Tissue ◽  
Bone Loss ◽  
Control Group ◽  
Tissue Thickness ◽  
Implant Placement ◽  
Soft Tissue Thickness ◽  
Crestal Bone Loss ◽  
Bone Level ◽  
Mandibular Region ◽  
To Receive

Aim The aim of this prospective study was to determine the influence of vertical soft tissue thickness on bone level changes in platform-switched implants placed eqicrestally or subcrestally and restored with screw-retained or cement-retained restorations. Methods Platform-switched bone-level implants were placed in a single stage manner in the posterior mandibular region. Implant sites were divided into thick (control) and thin (test) vertical soft tissue groups. The implants in the control group were placed equicrestally. The implant sites from the control group were randomly allocated to receive equicrestally or subcrestally placed implants. Bone remodeling/loss was radiographically measured at baseline, three months postoperatively and six months after delivery of final prosthetic restoration. Results The mean crestal bone loss values three months postoperatively and six months post prosthetic restoration were higher in sites with thin versus sites with thick gingiva. In implant sites with thin gingiva, subcrestally placed implants presented less bone loss than eqicrestally placed implants. Conclusion Platform switched implants are prone to more bone loss when they are placed in sites with thin soft tissue, regardless of the type of final restoration (screw-retained or cement-retained). Subcrestal placement of platform-switched implants can prevent crestal bone loss in sites with vertical soft tissue thickness < 3 mm.    

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.

scholarly journals Clinical effect of a herbal dentifrice on the control of plaque and gingivitis: a double-blind study

2003 ◽  
Vol 17 (4) ◽  
pp. 314-318 ◽  
Author(s):  
Claudio Mendes Pannuti ◽  
Joyce Pereira de Mattos ◽  
Paula Nini Ranoya ◽  
Alberto Martins de Jesus ◽  
Roberto Fraga Moreira Lotufo ◽  
...  
Keyword(s):  
Clinical Trial ◽  
Clinical Effect ◽  
Test Group ◽  
Control Group ◽  
Double Blind Study ◽  
Gingival Index ◽  
Control Groups ◽  
Double Blind ◽  
Double Blind Clinical Trial ◽  
Significant Difference

The aim of this randomized, double-blind clinical trial was to evaluate the effect of the Paradontax dentifrice on the reduction of plaque and gingivitis. Subjects were randomly allocated into either the test group (n = 15, Paradontax) or the control group (n = 15, standard dentifrice with fluoride). Plaque levels were measured using the Turesky modification of the Quigley & Hein Plaque Index (PI), and gingivitis was evaluated with the Gingival Index (GI). Subjects were asked to brush their teeth with the allocated dentifrice, three times a day, for 21 days. There was no significant difference between groups in relation to the PI and GI medians, at baseline and at the end of the 21-day period. There was no significant reduction in PI in either the test or control groups. There was a significant decrease in GI in the test group. The authors concluded that there was no difference between the dentifrices in the reduction of plaque and gingivitis.

Sign in / Sign up

Export Citation Format

Share Document