A novel reference model for dental scanning system evaluation: analysis of five intraoral scanners.

Purpose: The aim of this study was to investigate the accuracy (trueness and precision) of five intraoral scanners (IOS) using a novel reference model for standardized performance evaluation.

Materials And Methods: Five IOSs (Medit i500, Omnicam, Primescan, Trios 3, Trios 4) were used to digitize the reference model, which represented a simplified full-arch situation with four abutment teeth. Each IOS was used five times by an experienced operator, resulting in 25 STL (Standard Tessellation Language) files.

Esthetic and functional outcomes of narrow-diameter implants compared in a cohort study to standard diameter implants in the anterior zone of the maxilla.

Objective: The aim of this study was to evaluate functional and esthetic clinical outcomes and patient satisfaction with narrow-diameter implants in comparison to standard-diameter implants in the anterior zone of the maxilla in a follow-up examination after 1 to 6 years.

Method And Materials: The study was designed as a retrospective cohort study investigation including 27 patients receiving a 3.3-mm diameter single implant (NDI, n = 14) or a standard-diameter 4.

Surgical therapy of peri-implantitis with adjunctive hydroxyapatite and enamel matrix derivative: a 1-year retrospective case series.

This case series retrospectively investigated the one-year surgical outcome of regenerative peri-implantitis therapy using a hydroxyapatite (HA) bone substitute material in combination with enamel matrix derivate (EMD) and collagen membrane for guided bone regeneration (GBR). Data-sheets of patients were screened to detect patients who received identical regenerative peri implantitis-therapy with surface decontamination and GBR applying HA, EMD and a collagen membrane under broad- spectrum antibiotic regime. For inclusion, information on pre- and postoperative clinical and radiographic parameters (probing pocket depth (PPD), bleeding on probing (BOP), suppuration (SUPP) and the radiological bone level (RBL)) had to be available for statistical analysis.

Accuracy of a separating foil impression using a novel polyolefin foil compared to a custom tray and a stock tray technique.

Purpose: To compare the dimensional accuracy of three impression techniques- a separating foil impression, a custom tray impression, and a stock tray impression.

Materials And Methods: A machined mandibular complete-arch metal model with special modifications served as a master cast. Three different impression techniques (n = 6 in each group) were performed with addition-cured silicon materials: i) putty-wash technique with a prefabricated metal tray (MET) using putty and regular body, ii) single-phase impression with custom tray (CUS) using regular body material, and iii) two-stage technique with stock metal tray (SEP) using putty with a separating foil and regular body material.

Partial Ceramic Crowns Prepared by Dental Students: Clinical Performance Up to Five Years.

Partial ceramic crowns (PCCs) are an accepted treatment option for the restoration of posterior teeth with deficient tooth substance. Data on the survival of PCCs fabricated by dental students are scarce. The aim of this retrospective clinical study was to investigate the clinical performance and longevity of PCCs placed by dental students in the last year of their training program at the University of Basel, Switzerland.

Technical accuracy of printed surgical templates for guided implant surgery with the coDiagnostiX ™ software.

Background: Printing of templates for guided surgery represents an alternative to laboratory manufactured templates.

Purpose: To determine the technical accuracy of a virtually designed and printed surgical template for guided implant surgery based on a surface scan of a cast model using the coDiagnostiX™ software.

Materials And Methods: Cast models and the virtual planning data of nine patients receiving guided implant surgery with the coDiagnostiX software were analyzed.

Periodontal surgery in furcation-involved maxillary molars revisited--an introduction of guidelines for comprehensive treatment.

Maxillary molars with interradicular loss of periodontal tissue have an increased risk of additional attachment loss with an impaired long-term prognosis. Since accurate clinical analysis of furcation involvement is not feasible due to limited access, morphological variations and measurement errors, additional diagnostics, e.g.

Teledental consultations related to trauma in a Swiss telemedical center: a retrospective survey.

Background/aim: In addition to medical advice, telemedical centers also provide counseling on the telephone for patients with dental injuries.

Material And Methods: Data from a Swiss telemedical center during the years 2001-2008 were analyzed retrospectively.

Results: A total of 371 988 medical consultations were recorded.

[Frequency and manifestations of back pain in the dental profession].

Dentists, dental hygienists and dental assistants due to the nature of their work-related physical activity often have to deal with physical stress that will cause actual physical damage. The aim of the current survey was to analyse the frequency of job-related pain and associated impairment. The questionnaire for the cervical and lumbal region of the North American Spine Society was modified and used in the present investigation.

What is the prevalence of various types of prosthetic dental restorations in Europe?

Objectives: The aim of this review was to analyse the prevalence of prosthetic dental restorations in the adult population in Europe and to investigate factors influencing the frequencies of fixed restorations and removable dental prostheses (RDP).

Material And Methods: A search for literature up to 31 October 2006 on dental restorations was performed in Medline via PubMed and in an additional hand search using several keywords related to epidemiology and dental restorations. Out of approximately 6000 titles listed, 136 articles were identified, which were related to 13 different European countries.

The ovate pontic design: a histologic observation in humans.

Statement Of The Problem: Fixed partial dentures with an ovate pontic design contacting the underlying soft tissue may interfere with long-term mucosal health.

Purpose: The purpose of this study was to examine the clinical and histologic characteristics of the human alveolar ridge mucosa adjacent to an ovate pontic-designed restoration.

Material And Methods: Twelve patients requiring maxillary fixed partial dentures (either implant- or tooth-supported) with a pontic site in the premolar or molar region were studied.

A review of clinical and technical considerations for fixed and removable implant prostheses in the edentulous mandible.

Purpose: The aim of the present article is to review some of the technical treatment options for implant prostheses restoring the edentulous mandible, mainly based on the Brånemark system.

Materials And Methods: Clinical and technical aspects are discussed for the three established concepts: (1) implant-supported fixed prosthesis, (2) removable implant-supported overdenture, and (3) combined implant-retained and soft tissue-supported overdenture prosthesis.

Results: The framework of an implant-supported fixed screw-retained prosthesis can be processed in gold, Co-Cr alloy, or titanium with casting, laser-welding, or milling techniques.