Influence of substance loss and restoration materials on the fracture resistance of 1-piece endodontic crowns: An in vitro study.

Statement Of Problem: How different restorative materials designed for computer-aided design and computer-aided manufacturing (CAD-CAM) and substance loss affect the fracture resistance of endodontically treated maxillary first premolars restored with 1-piece endodontic crowns is unclear.

Purpose: The purpose of this in vitro study was to assess the impact of various CAD-CAM restorative materials and residual tooth structure on the fracture resistance of endodontically treated maxillary first premolars restored with 1-piece endodontic crowns.

Material And Methods: Sixty-four maxillary first premolars were endodontically treated and divided into 4 main groups (n=16) according to the restorative material: ZP: Zirconia 1-piece endodontic crowns group (IPS e.

Lay health worker-delivered and technology-based interventions for sexual and reproductive health among adolescents and young adults in low- and middle-income countries: protocol for a scoping review.

Background: Adolescents and young adults (AYAs) in low- and middle-income countries (LMICs) are at high risk of harmful sexual and reproductive health (SRH) practices due to limited knowledge, low availability or acceptability of modern contraceptives, gender inequality and cultural practices like child marriage. Preventive and educational interventions by lay health workers or through technological means are a cost-effective and scalable solution. Unfortunately, too little is currently known about the scope, content and conditions of the effectiveness and sustainability of these approaches and synthetic evidence on this topic is scarce.

Surface Pretreatment Protocols For Indirect/Semi-Direct Dental Restorations: A Cross-Sectional Survey and Expert Consensus.

Purpose: To investigate, via questionnaire, how protocols for adhesive luting workflows of dental restorations are applied in three German-speaking countries.

Material And Methods: A 47-item questionnaire gathered data on airborne particle abrasion (APA) unit characteristics, parameters, operating procedures, pretreatments in adhesive luting workflows for restorations, and participant demographics. The survey was distributed via trade journals, expert associations, universities, technical schools, and social media.

Single mandibular midline-implant supported overdentures: Fifteen-year clinical outcome.

Objective: The aim of this prospective pilot study was to evaluate the 15-year clinical performance of mandibular overdentures supported by a single midline implant in edentulous patients.

Methods: Eleven eligible patients were enrolled. A single implant was inserted in the midline of the mandible (Root Line; Promote, Camlog Biotechnologies, diameter 3.

Durability of resin bonding to translucent zirconia materials: An in vitro study.

Statement Of Problem: How the yttria content (3Y-PSZ, 4Y-PSZ and 5Y-PSZ) affects the tensile bond strength of luting resin to translucent zirconia ceramics is unclear.

Purpose: The purpose of this in vitro study was to evaluate whether the bond strength of resin to translucent zirconia ceramics and its durability are influenced by the yttria content (3Y-PSZ, 4Y-PSZ and 5Y-PSZ).

Material And Methods: Sixty-four disk-shaped specimens of zirconia ceramics were randomly allocated to 4 groups (n=16) with respect to the yttria concentration: GHT: 3 mol% yttria-partially stabilized zirconia 3Y-PSZ; GHTML: 3 mol% yttria-partially stabilized multilayered zirconia 3Y-PSZ; GSTML: 4 mol% yttria-partially stabilized zirconia 4Y-PSZ; and GUTML: 5 mol% yttria-partially stabilized zirconia 5Y-PSZ.

Influence of different primers and adhesive system combinations on the durability of resin bonding to lithium disilicate.

Statement Of Problem: The long-term performance of universal dental primers and adhesive systems where all the different components are mixed in a single composition has not yet been thoroughly investigated.

Purpose: The purpose of this in vitro study was to evaluate the bond strength and the durability of various luting composite resins to lithium disilicate ceramic after the application of the system's specific primer or after the application of a pure silane primer (Hoffmann's Silan).

Material And Methods: A total of 128 lithium disilicate specimens were etched with hydrofluoric acid and randomly divided into 4 main groups according to the assigned adhesive system.

Influence of different airborne-particle abrasion pressures, cleaning methods, and artificial aging on zirconia ceramic bonding.

Statement Of Problem: Airborne-particle abrasion (APA) with alumina combined with a primer or luting resin containing a phosphate monomer has been well established for resin bonding to zirconia. However, a standardized method for bonding to zirconia is unavailable, as some factors including the optimal pressure of airborne-particle abrasion, the cleaning method, and the luting resin system are still unclear because of the limited available data.

Purpose: The purpose of this in vitro study was to evaluate the influence of different airborne-particle abrasion pressures and different cleaning methods of zirconia on the tensile bond strength (TBS) of 2 luting resins system containing methylacryloyloxydecyl-dihydrogenphosphate (MDP) either in the primer or in the luting resin.

Influence of buccal bone lamella defects on hard and soft tissues with submerged and non-submerged healing in immediate implants - an experimental study in minipigs.

Purpose: This study assessed the impact of the buccal bone on hard and soft tissues in submerged and non-submerged immediate implants using a minipig model.

Methods: Sixty-five titanium implants (Camlog Progressive Line) were placed in four minipigs immediately after tooth extraction. All non-submerged (NSM) implants received a mechanically induced buccal bone defect (NSM-BD), whereas the submerged group (SM) was classified as defective (SM-BD) and intact (SM-BI).

Influence of proximal box elevation on microleakage in 3Y-TZP zirconia ceramic fixed dental prostheses after thermomechanical loading: A laboratory study.

Statement Of Problem: Deep subgingival defects at the abutment teeth for fixed dental prostheses (FDPs) are a common problem in prosthodontics. Surgical crown lengthening or orthodontic extrusion of the abutment teeth have been recommended treatment options. However, disadvantages such as extended treatment time, treatment costs, or surgical problems have to be considered.

Long-term outcome of anterior cantilever zirconia ceramic resin-bonded fixed dental prostheses: Influence of the pontic location.

Statement Of Problem: Scientific data on the long-term clinical performance of cantilever zirconia resin-bonded fixed dental prostheses (RBFDPs) replacing missing incisors are lacking.

Purpose: The purpose of this clinical study was to evaluate the survival, retention, and success rates of cantilever zirconia ceramic RBFDPs replacing missing maxillary and mandibular incisors.

Material And Methods: A total of 258 patients had been provided with 328 cantilever zirconia RBFDPs to replace missing incisors in the period 2001 to 2022.

Influence of pretreating enamel on the durability of resin bonds.

Statement Of Problem: Minimally invasive restorations adhesively bonded to prepared enamel have been well established clinically. However, studies on the durability of noninvasive restorations are still lacking.

Purpose: The purpose of this laboratory study was to evaluate the tensile bond strength (TBS) of a luting resin and its durability to differently pretreated enamel with 2 different etching procedures.

The Impact of an MDP-Containing Primer on the Properties of Zinc Oxide Networks Infiltrated with BisGMA-TEGDMA and UDMA-TEGDMA Polymers.

This study was conducted to evaluate the material properties of polymer-infiltrated zinc oxide networks (PICN) and the effect of using a phosphate monomer-containing primer applied before polymer infiltration. A total of 148 ZnO-network (zinc oxide) specimens were produced: = 74 were treated with a primer before polymer infiltration and light curing, while the remaining specimens were untreated. Each group was divided into two subgroups ( = 37) based on the infiltrating polymer: UDMA (aliphatic urethane-dimethacrylates)-TEGDMA (triethylene glycol-dimethacrylate) or BisGMA (bisphenol A-glycidyl-methacrylate)-TEGDMA.

Fracture Resistance and Wear Behavior of Ultra-Thin Occlusal Veneers Made From Translucent Zirconia Ceramics Bonded to Different Tooth Substrates.

Objective: Investigation of the mechanical properties of occlusal veneers made from zirconia with varying translucency, bonded to different tooth substrates.

Materials And Methods: Sixty-four extracted molars were divided into two groups: preparation within enamel (E) or extending into dentin (D). Veneers were milled from four zirconia ceramics (n = 8): 5Y-TZP (HT), a multilayer of 5 and 3Y-TZP (GT), 3Y-TZP (LT), and 4Y-TZP (MT).

Hydrofluoric Acid in Dentistry: An Investigation of Isolation and Neutralizing Agents and Precipitates on IPS e.max CAD.

Purpose: The purpose of this laboratory study was to evaluate common materials for isolation and neutralizing agents for hydrofluoric acid (HF). Additionally, surfaces of lithium disilicate ceramic were examined for precipitates after the etching and neutralizing process.

Materials And Methods: The HF permeability of the following isolation agents (n=8) was investigated by positioning them over pH indicator paper under airtight conditions and applying 9% HF: latex rubber dam; elastic plastomer rubber dam; nitrile gloves; latex gloves; liquid rubber dam; Teflon; AZ strip.

Influence of the preparation design on the retentive strength of resin-bonded attachments.

Objectives: The study investigated the influence of retention grooves and material thickness of the retainer wing on the retentive strength of resin-bonded attachments (RBAs).

Materials And Methods: Sixty-four extracted human molars were used. Each tooth received a preparation limited to the enamel for the retainer wings of the RBAs.

Soft Tissue Changes at the Pontic Sites of Cantilever Zirconia Ceramic Resin-Bonded Fixed Dental Protheses in the Esthetic Zone: A Clinical Observational Study.

Objective: Data on the stability of soft tissues at pontic sites of resin-bonded fixed dental protheses (RBFDP) are lacking. The purpose of this study was to evaluate soft tissue changes at pontic sites of cantilever zirconia ceramic RBFDPs with and without surgical pretreatment after different follow-up periods in the esthetic zone.

Materials And Methods: Impressions were taken after the insertion of the restorations and an intraoral scan was performed at follow-up examinations.

Single mandibular implant study - impact on dietary habits after 5 years of observation in patients with immediate and delayed loading protocols.

Objectives: Single midline implants in the edentulous mandible can be used to support existing complete dentures to improve patients' satisfaction and masticatory efficiency. The impact on patients' dietary habits and the influence of the loading protocol of the implants was the subject of this study.

Materials And Methods: In this prospective randomized clinical trial, edentulous patients with existing complete dentures in both jaws were treated with a single midline implant in the mandible.

Influence of different cutting instruments and rotational speeds on heat generation and cutting efficiency when sectioning different types of zirconia.

Purpose: The purpose of this study was to evaluate the temperature generated on the intaglio surface and efficiency when cutting different types of zirconia with different rotary instruments and rotational speeds.

Methods: A conventional diamond rotary instrument (Brasseler, grit size 107 μm) and special diamond rotary instrument marketed to cut zirconia (4 ZR, Brasseler, grit size 126 μm) were tested on 3Y-TZP and 4Y-TZP zirconia with a rotation speed of 100,000 rpm and 200,000 rpm. Zirconia specimens were cut under water cooling (110 mL/min) in a custom-made holder attached to a universal testing machine.

The physical-mechanical properties of 3D-printed versus conventional milled zirconia for dental clinical applications: A systematic review with meta-analysis.

Aim Of Study: This systematic review aimed to compare the physical-mechanical properties of 3D-printed (additively manufactured (AM)) zirconia compared to conventionally milled (subtractive manufactured: SM) zirconia specimens.

Materials And Methods: A thorough search of Internet databases was conducted up to September 2023. The search retrieved studies that evaluated AM zirconia specimens and restorations regarding the physical-mechanical properties and mechanical behavior of zirconia.

Influence of pretreating radicular dentin with different polyacrylic acids and isopropanol on the retention of posts.

Statement Of Problem: The optimal pretreatment of radicular dentin before cementing a post with glass ionomer cement is unclear.

Purpose: The purpose of this in vitro study was to evaluate the retention of prefabricated tapered titanium posts to endodontically treated teeth after applying different pretreatment protocols on the radicular dentin.

Material And Methods: The coronal part of 32 single-rooted human teeth was removed 1-mm coronally to the cemento-enamel junction.

Investigation of Mechanical Properties of Polymer-Infiltrated Tetrapodal Zinc Oxide in Different Variants.

The aim of this study was to evaluate the influence of weight ratio, the shape of the precursor particles, and the application of a phosphate-monomer-containing primer on the mechanical properties of polymer infiltrated ceramic networks (PICNs) using zinc oxide. Two different types of zinc oxide particles were used as precursors to produce zinc oxide networks by sintering, each with two different densities resulting in two different weight ratios of the PICNs. For each of these different networks, two subgroups were built: one involving the application of a phosphate-monomer-containing primer prior to the infiltration of Bis-GMA/TEGDMA and one without.

Effects of sterilization, conditioning, and thermal aging on the retention of zirconia hybrid abutments: A laboratory study.

Objective: To investigate the effects of sterilization, conditioning method, and thermal aging on the retentive strength of two-piece zirconia abutments.

Materials And Methods: In total, 128 stock zirconia abutments were divided into four groups (n = 32) according to the conditioning parameters: (A) air-abrasion using 50 μm alumina particles/1.0 bar, (B) 50 μm/2.

The Influence of Contamination and Different Cleaning Methods and the Effect of Plasma Treatment of CoCr Alloy on Tensile Bond Strength to Composite Resin.

Purpose: To investigate the influence of contamination and different cleaning methods on resin bonding to cobalt-chro- mium (CoCr) alloy disks.

Materials And Methods: A total of 160 CoCr disks were divided into 3 groups. The first group (N = 64) was air abraded with alumina particles and contaminated with a silicone disclosing agent and saliva; the second group (N = 64) was air abraded but not contaminated; the third group (N = 32) was neither air abraded nor contaminated.

3D-printed versus conventionally milled zirconia for dental clinical applications: Trueness, precision, accuracy, biological and esthetic aspects.

Objectives: This systematic review aimed to compare the clinical outcome, internal gap, trueness, precision, and biocompatibility of 3D-printed (AM) compared to milled (SM) zirconia restorations.

Data Source: A thorough search of Internet databases was conducted up to September 2023. The search retrieved studies compared AM zirconia to SM zirconia restorations regarding clinical outcome, fit, trueness, precision, and biocompatibility.

Long-term effect of simulated five years professional mechanical biofilm removal on the luting gap of ceramic restorations.

Background: Achieving sufficient professional mechanical biofilm removal (PMPR) can be challenging in supportive periodontal therapy (SPT), particularly in patients with prosthetic restorations. This experimental study aimed to simulate five years of SPT with periodic PMPR near the luting gap of ceramic restorations using a rubber cup with polishing paste (RCP), air polishing with two different low-abrasive powders (LAPA-1: glycine powder, LAPA-2: erythritol powder), and non-professional mechanical cleaning (control group) to measure the extent of volume loss in the luting gap after baseline (∆V = V-V; in µm).

Methods: Two operators randomly performed PMPR ten times for thirty seconds on one of four sides of 30 crown replicas fixed with glass-ionomer cement (CGIZ: n = 15) or adhesive bonding (CAB: n = 15).