Biomechanical influence of narrow-diameter implants placed at the crestal and subcrestal level in the maxillary anterior region. A 3D finite element analysis.

Purpose: To evaluate the tendency of movement, stress distribution, and microstrain of single-unit crowns in simulated cortical and trabecular bone, implants, and prosthetic components of narrow-diameter implants with different lengths placed at the crestal and subcrestal levels in the maxillary anterior region using 3D finite element analysis (FEA).

Materials And Methods: Six 3D models were simulated using Invesalius 3.0, Rhinoceros 4.

Biomechanical Evaluation of Different Implant-Abutment Connections, Retention Systems, and Restorative Materials in the Implant-Supported Single Crowns Using 3D Finite Element Analysis.

This is an in silico study aimed to evaluate the biomechanical influence of different implant-abutment interfaces (external hexagon and Morse taper implants), retention systems (cement and screw retained), and restorative crowns (metal-ceramic and monolithic) using 3-dimensional finite element analysis (3D-FEA). Eight 3D models were simulated for the maxillary first molar area using InVesalius, Rhinoceros, and SolidWorks and processed using Femap and NEi Nastran software. Axial and oblique forces of 200 and 100 N, respectively, were applied on the occlusal surface of the prostheses.

Clinical comparison between crestal and subcrestal dental implants: A systematic review and meta-analysis.

Statement Of Problem: How the performance of dental implants is related to their occlusogingival placement, crestal or subcrestal, is unclear.

Purpose: The purpose of this systematic review and meta-analysis was to evaluate marginal bone loss, implant survival rate, and peri-implant soft tissue parameters between implants placed at the crestal and subcrestal bone level.

Material And Methods: Two independent reviewers searched the PubMed/MEDLINE, Embase, and Cochrane Library databases for randomized clinical trials published up to September 2020.

Effect of bone quality and bone loss level around internal and external connection implants: A finite element analysis study.

Statement Of Problem: A consensus regarding the biomechanical effects of vertical bone loss in normal and osteoporotic bone tissue according to different implant-abutment interfaces is lacking.

Purpose: The purpose of this finite element analysis study was to evaluate the effect of vertical bone loss (without bone loss; with 1.5-mm bone loss; with 3-mm bone loss; and with 4.

Clinical effect of the high insertion torque on dental implants: A systematic review and meta-analysis.

Statement Of Problem: A consensus on the clinical performance in dental implants placed with different insertion torques is lacking.

Purpose: The purpose of this systematic review and meta-analysis was to evaluate the effect of high insertion torque compared with regular or low torques during dental implant placement in terms of implant survival rate and marginal bone loss.

Material And Methods: Two independent reviewers searched electronic databases for studies published until April 2019.

Clinical Evidence for Treatment of Class II Periodontal Furcation Defects. Systematic Review and Meta-analysis.

Background: This systematic review evaluated the most effective therapeutic approach to treat periodontal furcation defects with a minimum follow-up of 12 months. The primary outcome was clinical attachment level (CAL). Secondary outcomes were probing pocket depth, gingival margin level, gingival index and plaque index.

Systematic review and meta-analysis of welding procedures in one-piece cast implant-supported frameworks.

The objective of this systematic review and meta-analysis was to evaluate the effect of welding techniques on implant-supported prostheses and determine whether they contribute to a better adaptation compared with a one-piece cast. A search was conducted using the PubMed/MEDLINE, Embase, and Cochrane Library databases, and articles published until November 2017 were obtained from these databases. This review followed the PRISMA criteria and is registered on the PROSPERO platform (CRD42017081865).

Ceramic versus metal-ceramic implant-supported prostheses: A systematic review and meta-analysis.

Statement Of Problem: There is insufficient evidence to recommend the restorative material for implant-supported prostheses.

Purpose: The purpose of this systematic review and meta-analysis was to evaluate studies that compared ceramic and metal-ceramic restorations for implant-supported prostheses (within the same study to avoid indirect comparison) in terms of the mechanical and biological complication rates, prosthesis survival rate, and marginal bone loss.

Material And Methods: Two independent reviewers performed a comprehensive search in databases (PubMed/MEDLINE, Web of Science, and Cochrane Library) for articles indexed until March 31, 2018.

Short implants versus longer implants with maxillary sinus lift. A systematic review and meta-analysis.

This study compared the survival rate of dental implants, amount of marginal bone loss, and rates of complications (biological and prosthetic) between short implants and long implants placed after maxillary sinus augmentation. This systematic review has been registered at PROSPERO under the number (CRD42017073929). Two reviewers searched the PubMed/MEDLINE, Embase, LILACS, and Cochrane Library databases.

Should the restoration of adjacent implants be splinted or nonsplinted? A systematic review and meta-analysis.

Statement Of Problem: The decision to splint or to restore independently generally occurs during the planning stage, when the advantages and disadvantages of each clinical situation are considered based on the proposed treatment. However, clinical evidence to help clinicians make this decision is lacking.

Purpose: The purpose of this systematic review and meta-analysis was to assess the marginal bone loss, implant survival rate, and prosthetic complications of splinted and nonsplinted implant restorations.

Comparison of the Use of Titanium-Zirconium Alloy and Titanium Alloy in Dental Implants: A Systematic Review and Meta-Analysis.

The aim of this study was to compare the values of bone-implant contact (BIC) and removal torque (RTQ) reported in different animal studies for titanium-zirconium (TiZr) and titanium (Ti) dental implants. This review has been registered at PROSPERO under number CRD42016047745. We undertook an electronic search for data published up until November 2017 using the PubMed/Medline, Embase, and The Cochrane Library databases.

Three-dimensional finite element analysis of glass fiber and cast metal posts with different alloys for reconstruction of teeth without ferrule.

The aim of this study was to evaluate different materials for restoration of teeth without ferrule by three-dimensional (3D) finite element analysis (FEA). Five models simulating the maxillary central incisor and surrounding bone were simulated according to the type of post: glass fibre post (GFP) or cast metal post (CMP) with different alloys such as gold (Au), silver-palladium (AgPd), copper-aluminum (CuAl) and nickel-chromium (NiCr). Models were designed using Invesalius and Rhinoceros.

Palliative care for patients with HIV/AIDS admitted to intensive care units.

Objective: To describe the characteristics of patients with HIV/AIDS and to compare the therapeutic interventions and end-of-life care before and after evaluation by the palliative care team.

Methods: This retrospective cohort study included all patients with HIV/AIDS admitted to the intensive care unit of the Instituto de Infectologia Emílio Ribas who were evaluated by a palliative care team between January 2006 and December 2012.

Results: Of the 109 patients evaluated, 89% acquired opportunistic infections, 70% had CD4 counts lower than 100 cells/mm3, and only 19% adhered to treatment.

Influence of bicortical techniques in internal connection placed in premaxillary area by 3D finite element analysis.

The aim of study was to evaluate the stress distribution in implant-supported prostheses and peri-implant bone using internal hexagon (IH) implants in the premaxillary area, varying surgical techniques (conventional, bicortical and bicortical in association with nasal floor elevation), and loading directions (0°, 30° and 60°) by three-dimensional (3D) finite element analysis. Three models were designed with Invesalius, Rhinoceros 3D and Solidworks software. Each model contained a bone block of the premaxillary area including an implant (IH, Ø4 × 10 mm) supporting a metal-ceramic crown.

Can the modeling for simplification of a dental implant surface affect the accuracy of 3D finite element analysis?

The aim of this study was to assess stress/strain of different implant modeling simplifications by 3D-FEA. Three variation of external hexagon implant (Ø3.75 × 10 mm) supporting one molar crown were simulated: A (no threads); B (slightly threads simplification); C (original design).