Influence of different scan body design features and intraoral scanners on the congruence between scan body meshes and library files: An in vitro study.

Statement Of Problem: Implant scan bodies (ISBs) present with a variety of features, including diverse design geometries and manufacturing materials. How these features influence the congruence between the clinically obtained mesh file and the software-based library file of the scan body during the alignment stage within the computer-aided design (CAD) software program is unclear. It is also uncertain how these features influence the scanning accuracy of different scanners.

A comprehensive review and update on the current state of computer-assisted rehabilitation in implant dentistry.

Aim: This paper provides a comprehensive review of the established concepts and newer developments related to computer-assisted implant rehabilitation.

Methods: Two independent researchers searched the English literature published to 31st December 2023 in the PubMed/Medline database for primary and secondary research and related publications on computer-assisted implant planning, computer-assisted implant placement and computer-assisted implant restoration.

Results: A total of 58,923 papers were identified, 198 relevant papers were read in full text and 110 studies were finally included.

The current state of computer assisted orthognathic surgery: A narrative review.

Objectives: Since cone beam computed tomography (CBCT) became available, research in the field of computer assisted orthognathic surgery (CAOS) is constantly on the rising. It is the purpose of the present paper to describe the use of the available digital technology in the workflow of CAOS and to provide insight on the advantages and limitations arising from the use of both hardware and software.

Study Selection, Data And Sources: Systematic reviews, randomised controlled trials, prospective and retrospective clinical studies, case series and reports were consulted with search terms having been entered into PubMed, Google Scholar and the Cochrane database.

Complete Digital Restoration: Implant-Supported Prosthesis Using Rapid Prototyping and a Model-Free Approach.

This report presents a completely digital workflow utilizing digital intraoral scanning, rapid prototyping techniques, and a monolithic final restoration. A complete fixed prosthesis supported by six implants was used to replace a patient's periodontally compromised mandibular natural dentition. A staged approach was used in which a series of milled and 3D-printed provisional restorations were fabricated to help the patient transition to the dental implant rehabilitation.

Influence of different material substrates on the accuracy of 3 intraoral scanners: A single-blinded in vitro study.

Purpose: To compare the accuracy of three commercially available intraoral scanners when imaging various dental material substrates.

Materials And Methods: A maxillary dentate typodont model with 11 different dental material substrates was prepared and scanned using three intraoral scanners (TRIOS 3, 3Shape; CS 3600, Carestream; and Emerald S, Planmeca). The model was further scanned with a laboratory scanner (7series, Dental Wings) for reference.

The direct digital workflow in fixed implant prosthodontics: a narrative review.

Background: The purpose of this narrative review was to examine the applicability of IOS procedures regarding single and multiple fixed implant restorations. Clinical outcomes for monolithic zirconia and lithium disilicate restorations produced through a direct digital workflow were reported.

Methods: A MEDLINE (Pubmed) search of the relevant English-language literature spanning from January 1st 2015 until March 31st 2020 was conducted.

Use of CBCT and Low-Cost Additive Manufacturing in Implant Surgical Guide Fabrication.

The use of dental implants to restore oral form and function has transformed the dental treatment of both partially and fully edentulous patients. With the advent of cone-beam computed tomography (CBCT) imaging technology in 1998 followed by its establishment at the beginning of the new century as the imaging modality of choice in implant treatment, 2-dimensional treatment planning was abruptly supplemented by the much-cherished third dimension. Additive manufacturing, ie, the fabrication of an object by adding material layer by layer, was pioneered in the early 1980s and has become readily available and relatively affordable over the past few years.

A comparison of accuracy of 3 intraoral scanners: A single-blinded in vitro study.

Statement Of Problem: Measuring both the trueness and precision of an intraoral scanner (IOS) will provide a thorough understanding of its accuracy.

Purpose: The purpose of this in vitro study was to measure the complete-arch trueness and precision of 3 commercially available intraoral scanners equipped with the latest software version and compare them by using a laboratory scanner as reference.

Material And Methods: Nineteen maxillary and 19 mandibular completely dentate stone casts previously acquired from 19 patients by using a polyvinyl siloxane (PVS) dual mix impression and stock trays were scanned with 3 intraoral scanners (TRIOS 3; 3Shape A/S, i500; Medit, and Emerald; Planmeca) using their latest software versions.

Accuracy of triangular meshes of stone models created from DICOM cone beam CT data.

Background: The aim of this study was to assess the theory that CBCT scanners can be used for a subsequent triangular mesh generation which accurately represents the actual stone model. Ten, recently acquired stone models, were used in the present study. The stone models were initially scanned with the Dental Wings 7Series dental scanner.

CAD/CAM implant surgical guides: maximum errors in implant positioning attributable to the properties of the metal sleeve/osteotomy drill combination.

Background: The purpose of this study is to provide the relevant equations and the reference tables needed for calculating the maximum errors in implant positioning attributed to the properties of the mechanical parts of any CAD/CAM implant surgical guide, especially the in-office manufactured ones.

Methods: An algorithm was developed and implemented in C programming language in order to accurately calculate the maximum error at the apex, error at the neck, vertical error at the apex and deviation of implant axis, between the planned and the actual implant position. The calculations were based on the parameters of total length (= implant length + offset), offset (distance from neck of implant to the lip of the metal sleeve), clearance (space between the bur and the sleeve), sleeve length.

Radiographic evaluation of the superior alveolar canal: measurements of its diameter and of its position in relation to the maxillary sinus floor: a cone beam computerized tomography study.

Objectives: The superior alveolar canal with its contents is frequently reported as an anatomical point of consideration during lateral sinus floor elevation due to the danger of bleeding and of the subsequent impairment of vision of the surgical field. Malnutrition of the graft may also ensue. This radiographical study uses cone beam computerized tomography to identify the superior alveolar canal, to measure its diameter and its distance from the sinus floor at precise tooth positions to provide the implant surgeon with information about the position and the diameter of the canal.

The dimensions of the mandibular incisive canal and its spatial relationship to various anatomical landmarks of the mandible: a study using cone beam computed tomography.

Purpose: Often during implant surgery in the mandibular symphysis area, little attention is given to the mandibular incisive canal. Although it is true that intraoperative and postoperative complications with implants in the incisive mandibular canal are rare, they are more common when harvesting bone from the chin area. Loss of tooth sensation is a rather frequent consequence.

The anterior loop of the inferior alveolar nerve: prevalence, measurement of its length and a recommendation for interforaminal implant installation based on cone beam CT imaging.

Objectives: Interforaminal implant surgery requires anatomical knowledge of the area and adequate information on the location of the various landmarks of significance such as the mental foramen, the anterior loop of the inferior alveolar nerve and the mandibular incisive canal. Cone beam computed tomography (CBCT) is a relatively new imaging modality that provides a multi-dimensional view of the facial skeleton with, in most instances, lower radiation dose to the patient compared to medical CT. The present study aims to use CBCT to identify and measure variation in the presence and extent of the anterior loop of the inferior alveolar nerve.