scholarly journals Marginal Bone Loss in Implants with External Connection versus Internal Conical Connection Prior to Prosthetic Loading. A Randomized Clinical Study

Coatings ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1044
Author(s):  
Natalia Palacios-Garzón ◽  
Raul Ayuso-Montero ◽  
Enric Jané-Salas ◽  
José María Anglada-Cantarell ◽  
José López-López
Keyword(s):  
Clinical Trial ◽  
Clinical Study ◽  
Bone Loss ◽  
Resonance Frequency Analysis ◽  
Marginal Bone Loss ◽  
Randomized Clinical Study ◽  
Conical Connection ◽  
External Connection ◽  
The Stability

Introduction: The prosthetic connection of implants has been related to the loss of marginal bone. The aim of this study was to evaluate bone loss around external connection (EC) and internal conical connection (ICC) implants prior to prosthetic loading. Material and methods: A randomized clinical trial (RCT) was carried out, with a sample size of 93 implants (31 EC and 62 ICC) placed in 27 patients. Radiological controls were performed and stability was measured by resonance frequency analysis (RFA) on the day of placement, at 1 month and at 4 months after the placement. Results: Bone loss in EC implants was not statistically different than in ICC implants between the time of placement (T0) and the subsequent month (T1): (EC = 0.18 mm and ICC = 0.17 mm). Between one month (T1) and four months (T2): (EC = 0.39 mm and ICC = 0.19 mm) this difference was highly significant (p = 0.00). Bone loss between T0 and T2 was significantly lower in the ICC (EC = 0.57 mm and ICC = 0.36 mm), (p = 0.01). The overall success rate of the implants was 97.8%. The stability of the implants increased from 70.69 (T0) to 73.91 (T1) and 75.32 (T2). Conclusions: ICC showed less bone loss up to the time of prosthesis placement. Such bone loss did not have a significant impact on bone stability. Long term RCTs are needed to demonstrate whether this bone loss, which is more pronounced at the beginning in EC, tends to stabilize and equate to ICC.

scholarly journals Effects of photofunctionalization on early osseointegration of titanium dental implants in the maxillary posterior region: a randomized double-blinded clinical trial

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Bada Choi ◽  
Ye Chan Lee ◽  
Kyung Chul Oh ◽  
Jae Hoon Lee
Keyword(s):  
Clinical Trial ◽  
Resonance Frequency ◽  
Bone Quality ◽  
Frequency Analysis ◽  
Treated Group ◽  
Posterior Region ◽  
Resonance Frequency Analysis ◽  
Group Iii ◽  
The Stability ◽  
Double Blinded

Abstract Background This study aimed to investigate the effects of ultraviolet (UV) photofunctionalization on the stability of implants during the early phase in the posterior region of the maxilla. The study was a randomized double-blinded clinical trial. Half of the participants received conventional commercial implants while the other half received UV-irradiated implants. The surgical sites were classified into three bone quality groups (II, III, IV) based on the grayscale value measured on cone-beam computed tomography. The values obtained from resonance frequency analysis were recorded immediately after implant placement and at 4 weeks and at 4 months postoperatively. The marginal bone level of the implants was evaluated using periapical radiographs at 4 weeks, 4 months, and 1 year postoperatively. Results Fifty-seven implants placed in 34 participants were analyzed in this study. In group III, significant differences were observed in terms of the differences of resonance frequency analysis values at 4 weeks (p = 0.004) and 4 months (p = 0.017) postoperatively. In group II, the UV-treated group showed significantly lesser bone loss at 4 weeks post-operatively (p = 0.037). Conclusions Within the limitation of the present study, we concluded that UV surface treatment on implants may increase the initial stability in the region of the maxilla with poor bone quality.

scholarly journals Long‐term safety of adjunctive cenobamate in patients with uncontrolled focal seizures: Open‐label extension of a randomized clinical study

Epilepsia ◽  
2021 ◽  
Author(s):  
Jacqueline A. French ◽  
Steve S. Chung ◽  
Gregory L. Krauss ◽  
Sang Kun Lee ◽  
Maciej Maciejowski ◽  
...  
Keyword(s):  
Clinical Study ◽  
Open Label ◽  
Focal Seizures ◽  
Randomized Clinical Study ◽  
Open Label Extension

scholarly journals Infra-Zygomatic Mini Screws Compared to High Pull Headgear for Distalization And Intrusion of Maxillary Molars in Growing Patients with Class II Malocclusion: A Randomized Clinical Trial

2021 ◽  
Vol 2 (1) ◽  
pp. 14-19
Author(s):  
Ahmed K. Afify ◽  
Amr E. El-Dakroury ◽  
Sherif A. El-Kordy ◽  
Mostafa M. El-Dawlatly
Keyword(s):  
Clinical Trial ◽  
Clinical Study ◽  
Treatment Duration ◽  
Class Ii ◽  
Class Ii Malocclusion ◽  
Maxillary Molars ◽  
Randomized Clinical Study ◽  
Molar Intrusion ◽  
Before And After ◽  
Patient Cooperation

Objective: The aim of the present randomized clinical study was to evaluate the distalization and intrusion effect of an Infra-zygomatic mini-screws supported appliance and compare it with high pull headgear appliance in treatment of growing patients with class II malocclusion. Methodology: 22 growing boys aged between (10 to 12 years) with class II div 1 malocclusion randomly divided to 2 equal groups. The first group treated with high pull headgear with acrylic splint and the second one treated with an Infra-zygomatic mini-screws supported appliance. The treatment duration was 8 months for both groups. Lateral cephalometric radiographs were taken before and after the treatment for each patient to be analyzed. Results: The maxillary first molar distalization was 2.58±2.31 mm in head gear group and 1.53±2.83 mm in mini-screws group. There was no significant maxillary first molar intrusion in both groups. There were no significant differences between the two groups. Conclusions: the mini-screws supported appliance can be used as the fixed replacement of the removable high pull headgear appliance with no need for patient cooperation.

scholarly journals Prosthetic complications of fixed dental prostheses supported by locking-taper implants: A retrospective study with a mean follow-up of 5 years.

2021 ◽  
Author(s):  
Wen Mo Gao ◽  
Wei Geng ◽  
Chen Chen Luo
Keyword(s):  
Retrospective Study ◽  
Bone Loss ◽  
Regression Model ◽  
Protective Factor ◽  
Cox Regression ◽  
Marginal Bone Loss ◽  
Cox Regression Model ◽  
Prosthetic Complications ◽  
Free Rate

Abstract Background: Restoration with locking-taper implants is a widely used methodology. However, relatively few have examined conical connection systems like locking-taper implant systems. This study provides a retrospective study of locking-taper fixed restorations, mainly focused on prosthetic complications.Methods: All patients who underwent conical connected implants from 2008–2010 were examined. Preparation of the implant sites was performed according to the standard procedures for the Bicon system. The bone healing took over 6 months, and the prosthetic procedure was initiated thereafter. Integrated abutment crowns or gold porcelain crowns were used, and the prosthesis type was a single crown or a fixed dental prosthesis. Once the crown was in place, its occlusion was thoroughly checked and adjusted, and then the crown was glazed or finely polished. The Kaplan-Meier method was used to calculate the cumulative complication-free rates for 5 and 10 years. Additionally, a Cox regression model was used to identify the factors that independently influenced the results. Implant survival and marginal bone loss were also investigated.Results: A total of 392 patients who underwent 541 implants and 434 locking taper implant-based restorations from 2008–2010 were examined. The overall 5-year cumulative complication-free rate was 83.34%. The most common prosthetic complication was veneer chipping, with a frequency of 67.53%. According to the Cox regression model, the complication-free rate of integrated abutment crowns was significantly higher than gold porcelain crowns, molar regions was significantly higher than premolar regions, and females was significantly higher than males. Only three implant failures happened, and a mean marginal bone loss at 1- year, 5-year and 10- year was 0.25mm（95%CI：±0.12）, 0.40mm （95%CI：±0.03）and 0.51mm（95%CI：±0.05）, respectively.Conclusion: Veneer chipping was the most common complication with locking-taper implants supported fixed restorations. According to the result of Cox regression model, gold porcelain crowns are a protective factor relative to integrated abutment crowns, male sex is a protective factor relative to female sex, and premolar prosthetics are a protective factor relative to molar prosthetics. The long-term clinical effect of locking-taper implant is stable, and the implant success rate can meet the clinical needs. The bone tissue level around the implant can maintain long-term stability.

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 Factors Influencing Early Marginal Bone Loss around Dental Implants Positioned Subcrestally: A Multicenter Prospective Clinical Study

2019 ◽  
Vol 8 (8) ◽  
pp. 1168 ◽  
Author(s):  
Teresa Lombardi ◽  
Federico Berton ◽  
Stefano Salgarello ◽  
Erika Barbalonga ◽  
Antonio Rapani ◽  
...  
Keyword(s):  
Clinical Study ◽  
Bone Loss ◽  
Final Analysis ◽  
Prospective Clinical Study ◽  
Marginal Bone Loss ◽  
Insertion Depth ◽  
Mucosal Thickness ◽  
Implant Loading ◽  
Ceramic Restorations ◽  
Time Point

Early marginal bone loss (MBL) is a non-infective remodeling process of variable entity occurring within the first year after implant placement. It has a multifactorial etiology, being influenced by both surgical and prosthetic factors. Their impact remains a matter of debate, and controversial information is available, particularly regarding implants placed subcrestally. The present multicenter prospective clinical study aimed to correlate marginal bone loss around platform-switched implants with conical connection inserted subcrestally to general and local factors. Fifty-five patients were enrolled according to strict inclusion/exclusion criteria by four clinical centers. Single or multiple implants (AnyRidge, MegaGen, South Korea) were inserted in the posterior mandible with a one-stage protocol. Impressions were taken after two months of healing (T1), screwed metal-ceramic restorations were delivered three months after implant insertion (T2), and patients were recalled after six months (T3) and twelve months (T4) of prosthetic loading. Periapical radiographs were acquired at each time point. Bone levels were measured at each time point on both mesial and distal aspects of implants. Linear mixed models were fitted to the data to identify predictors associated with MBL. Fifty patients (25 male, 25 female; mean age 58.0 ± 12.8) with a total of 83 implants were included in the final analysis. The mean subcrestal position of the implant shoulder at baseline was 1.24 ± 0.57 mm, while at T4, it was 0.46 ± 0.59 mm under the bone level. Early marginal bone remodeling was significantly influenced by implant insertion depth and factors related to biological width establishment (vertical mucosal thickness, healing, and prosthetic abutment height). Deep implant insertion, thin peri-implant mucosa, and short abutments were associated with greater marginal bone loss up to six months after prosthetic loading. Peri-implant bone levels tended to stabilize after this time, and no further marginal bone resorption was recorded at twelve months after implant loading.

scholarly journals Effect of different implant‐abutment mismatch sizes on marginal bone loss ‐ prospective clinical trial

2019 ◽  
Vol 30 (S19) ◽  
pp. 23-23
Author(s):  
Roberto Pessoa ◽  
Ravel Sousa ◽  
Leandro Pereira ◽  
Eduardo Emi Shah ◽  
Guilherme Oliveira ◽  
...  
Keyword(s):  
Clinical Trial ◽  
Bone Loss ◽  
Prospective Clinical Trial ◽  
Marginal Bone Loss ◽  
Implant Abutment
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