In Vitro Handling Characteristics of a Particulate Bone Substitute for Ridge Preservation Procedures.

While particulate bone substitute materials are applied in a variety of augmentation procedures, standardized defects are being used for preclinical testing. This in vitro study evaluated the density and homogeneity of a particulate bone substitute in ridge preservation procedures. Premolars and molars were extracted in ten semimandibles of minipig cadavers.

Pilot study on the applicability of boron-doped diamond electrodes for tooth whitening.

Objectives: While various approaches are available for tooth whitening, the basic concept employs the use of peroxides in the form of gels, which are applied to tooth surfaces. Previous studies have shown that reactive oxygen species acting as potent disinfectants can be produced using boron-doped diamond (BDD) electrodes for the electrolysis of water. With these electrodes being applicable, for example, for endodontic treatment, it was the goal of this pilot study to use such electrodes for tooth whitening.

Wedge Shaped vs Round Implants: Bone Strain During the Insertion Process.

A novel implant system resembling the shape of a wedge and employing piezosurgery for implant bed preparation has been introduced with the aim of solving the problem of horizontal bone deficiency. This in vitro study compared emerging bone strain during insertion of a conventionally round implant vs the wedge implant. Adhering to the manufacturers' protocols, implant surgery was performed in polyurethane foam blocks equipped with strain gauges attached to the buccal and occlusal surfaces.

Use of a dentin bonding agent for the fixation of strain gauges on bone.

Capturing deformation of bone using strain gauges is still a common approach in biomechanics. So far, the bone surfaces had to be sanded and cleaned using various solvents prior to attaching the sensors using cyanoacrylate. This work proposes a novel approach employing common bonding procedures to enamel and dentin as used in restorative dentistry.

Rationale for a novel attachment system for implant-supported overdentures.

Purpose: To quantify the effect of support stiffness on the retention forces of telescopic crowns and to evaluate a prototype attachment system incorporating a nickel-titanium element.

Materials And Methods: In the first part of the study, telescopic crowns were fabricated employing standard laboratory procedures. For six combinations of telescopic crowns, the separation force was determined while varying the stiffness of their supporting implants.

Adhesive removable partial denture attachments made from zirconia ceramic: A finite element analysis and in vitro study.

Statement Of Problem: Whether adhesive zirconia ceramic removable partial denture attachments are feasible with current technology is unclear.

Purpose: The purpose of this finite element analysis and in vitro study was to evaluate the effect of the lever arm, tooth preparation, and aging on the loading of the tooth-zirconia attachment interface.

Material And Methods: Three different finite element analysis (FEA) models allowing for the loading of an adhesive attachment either directly or through a removable partial denture were used.

Students at Saarland University dental school-A survey on their background and curriculum perception.

Introduction: With the aim of optimising dental education without overburdening students, new legislation restructuring the undergraduate dental curriculum in German is under way. The goal of this study was to survey the current situation of dental students at one specific university with respect to their socio-economic background, admission to dental school, curriculum perception and work-life balance.

Materials And Methods: An online questionnaire was presented to all undergraduate students enrolled at Saarland University who had at least completed the first preclinical practical course in dentistry.

Pilot Study on the Use of a Laser-Structured Double Diamond Electrode (DDE) for Biofilm Removal from Dental Implant Surfaces.

No proper treatment option for peri-implantitis exists yet. Based on previous studies showing the in vitro effectiveness of electrochemical disinfection using boron-doped diamond electrodes, novel double diamond electrodes (DDE) were tested here. Using a ceramic carrier and a laser structuring process, a clinically applicable electrode array was manufactured.

Evaluation of Insertion Energy as Novel Parameter for Dental Implant Stability.

Insertion energy has been advocated as a novel measure for primary implant stability, but the effect of implant length, diameter, or surgical protocol remains unclear. Twenty implants from one specific bone level implant system were placed in layered polyurethane foam measuring maximum insertion torque, torque-time curves, and primary stability using resonance frequency analysis (RFA). Insertion energy was calculated as area under torque-time curve applying the trapezoidal formula.

Insertion torque/time integral as a measure of primary implant stability.

The goal of this in vitro study was to determine the insertion torque/time integral for three implant systems. Bone level implants (n = 10; BLT - Straumann Bone Level Tapered 4.1 mm × 12 mm, V3 - MIS V3 3.

Insertion and Loading Characteristics of Three Different Bone-Level Implants.

Purpose: While primary stability still constitutes an important factor for implant success, high levels of insertion torque resulting from bone compression are controversial and may constitute a co-factor in peri-implant bone loss.

Materials And Methods: Adhering to the manufacturers' protocols for medium-quality bone, implant surgery was performed in polyurethane foam blocks equipped with strain gauges attached to the buccal aspect. Following insertion and attachment of provisional abutments, oblique loading was performed.

A Pilot Animal Study Aimed at Assessing the Mechanical Quality of Regenerated Alveolar Bone.

Purpose: Bone regeneration procedures are often evaluated based on biologic aspects only. As regenerated bone also has to ensure primary implant stability, the goal of this study was to determine the mechanical quality of regenerated bone.

Materials And Methods: Six adult minipigs were allocated for this experiment with four mandibular study sites each established following tooth removal.

Does intraoperative bone density testing correlate with parameters of primary implant stability? A pilot study in minipigs.

Objectives: Bone density, surgical protocol, and implant design are the major determinants of primary stability. The goal of this animal trial was to investigate potential correlations of intraoperative bone density testing with clinical and histologic parameters of primary implant stability.

Material And Methods: Following extractions of all mandibular premolars and subsequent healing, four implants each were placed in a total of four minipigs.

Mechanical stress during implant surgery and its effects on marginal bone: a literature review.

Objective: High levels of primary implant stability have been advocated particularly for immediate loading protocols. Current implant systems and drill protocols are intended not to cause excessive stress on bone during implant insertion as resorptive processes might compromise esthetics and function. The goal of this narrative review was to summarize current data on the effect of mechanical stress on alveolar bone.

Electrochemical Disinfection of Experimentally Infected Teeth by Boron-Doped Diamond Electrode Treatment.

Disinfection and prevention of re-infection are the decisive treatment steps in endodontic therapy. In this study, boron-doped diamond (BDD) electrodes have been fabricated and used for disinfecting the root canals of extracted human teeth, which had been covered with bacterial biofilms formed by and . The growth of could be successfully impaired, achieving a complete disinfection after 8.

Reliability of clinical techniques for evaluating alveolar bone quality and primary implant stability.

Objective: A novel device for intraoperative compressive testing of alveolar bone during implant surgery has been introduced. It was the goal of this study to compare the performance of this device with traditional methods used for determining alveolar bone quality and primary implant stability.

Method And Materials: Implant surgery in human cadaver bone was performed by two implantologists differing in experience.

Effect of bone quality, implant design, and surgical technique on primary implant stability.

Objective: Adaptation of the surgical protocol and implant selection depending on bone quality has been advocated. It was the goal of this in-vitro study to quantify the effect of implant geometry and implant site preparation on micromotion at the implant-bone interface.

Method And Materials: A parametric study was conducted with implants differing in shape, length, and diameter placed in polyurethane foam material differing in density and structure following various methods of implant site preparation.

Fracture of Reduced-Diameter Zirconia Dental Implants Following Repeated Insertion.

Purpose: Achievement of high insertion torque values indicating good primary stability is a goal during dental implant placement. The objective of this study was to evaluate whether or not two-piece implants made from zirconia ceramic may be damaged as a result of torque application.

Materials And Methods: A total of 10 two-piece zirconia implants were repeatedly inserted into polyurethane foam material with increasing density and decreasing osteotomy size.

Characterisation of Roseomonas mucosa isolated from the root canal of an infected tooth.

Objective: The genus Roseomonas comprises a group of pink-pigmented, slow-growing, aerobic, non-fermentative Gram-negative bacteria, which have been isolated from environmental sources such as water and soil, but are also associated with human infections. In the study presented here, Roseomonas mucosa was identified for the first time as part of the endodontic microbiota of an infected root canal and characterised in respect to growth, antibiotic susceptibility and biofilm formation.

Results: The isolated R.

Comparison of simplistic biofilm models for evaluating irrigating solutions.

Objective: Many innovations have recently been implemented in the field of endodontics, often based on a variety of in-vitro/ex-vivo test setups. It was the goal of this research to compare different biofilm models for evaluating the effectiveness of rinsing solutions.

Method And Materials: Three different models have been applied in this study, including petri dishes with nutrient medium, arrays of human dentin disks, and split bovine root segments.

Correlation Between Micromotion and Gap Formation at the Implant-Abutment Interface.

Purpose: This study aimed to correlate micromotion and gap measurements at the implant-abutment interface.

Materials And Methods: A total of 10 implant-abutment assemblies were subjected to micromotion measurements under cyclic loading and subsequently quartered and inspected under a light microscope to measure vertical and horizontal gaps between implant and abutment. Statistical analysis was based on Pearson product-moment correlations (α = .

Effect of endodontic access cavity preparation on monolithic and ceramic veneered zirconia restorations.

Objectives: Due to the high chipping rates observed in veneered zirconia ceramic restorations, the use of monolithic zirconia restorations has been recommended. This study tried to compare veneered and monolithic zirconia fixed dental prostheses (FDPs) with respect to the amount of damage induced by endodontic access preparation.

Method And Materials: Monolithic and ceramic veneered (n = 10) three-unit restorations (retainers: first premolar and first molar; pontic: second premolar) were subject to endodontic access cavity preparation in both retainers using a diamond rotary instrument under continuous water cooling.