Effects of aging on the tensile strength and surface condition of orthodontic aligners: a comparative study of five models.

Background/objective: The objective of this study is to determine the effect of aging on tensile strength and surface condition of orthodontic aligners on days 0, 1, 5, 7, 10, and 14.

Materials/methods: The total sample of 80 aligners included five brands (Accusmile®, Angel®, GRAPHY®, Invisalign® and Suresmile®) were placed in a thermocycler to imitate the temperature variations of the oral cavity and accelerate aging for 50, 250, 350, 500, and 700 cycles. The mechanical tensile properties (Young's modulus E, yield strength YS, maximum elastic stress MES, Ultimate Tensile Strength UTS, and maximum stress MS) were measured by Universal Testing Machine at a rate of 5 mm of deformation per minute for 4 minutes.

Assessment of interproximal enamel reduction planned by the digital set-up of a customized lingual orthodontic appliance: A comparison cohort study.

Objectives: Interproximal enamel reduction (IER), commonly known as stripping, is a frequently used technique in orthodontic treatment to address issues related to arch length discrepancies and tooth size discrepancies (TSD). The use of digital set-up allows for precise prediction of the amount of IER required. TSD occurs when the sizes of maxillary and mandibular teeth are not in proportion to each other.

Evaluation of orthodontists' experience with the surgery first protocol in orthodontic-surgical management.

Aim Of The Study: The aim of this study was to analyze the popularity of surgery first among orthodontists as well as the protocols used for its implementation and to collect the opinions (favorable or unfavorable) of practitioners and patients regarding it.

Materials And Methods: A questionnaire was sent to a population of dental surgeons qualified in Dentofacial Orthopedics or in the process of specialization (residents) practicing in France. The questionnaire consisted of a total of 27 questions.

Evaluation of orthodontic habits regarding the use of miniplates in the correction of Skeletal Class III.

Aims: To determine the habits of Orthodontists in the management of moderate skeletal class III patients by using miniplates, and to assess the relationship between the factors that may hinder the implementation of such treatment.

Material And Methods: A questionnaire was carried out using the Google Form® platform, which included 18 questions relating to the seniority of the practice of the orthodontists, the preferential treatment, the difficulties encountered, the results obtained, and the frequency of a relapse.

Results: Experienced orthodontists (more than 10 years) treated skeletal class III malocclusion with the conventional facemask therapy, whereas orthodontists with less than 5 years of experience shifted to the miniplate technique which presented less dental effect and more skeletal correction with a decreased frequency of relapse.

Microhardness and Chemical Composition of Different Metallic Brackets: An Study.

The purpose of the study is to compare the hardness of different metallic brackets to enamel and to determine their chemical composition and microstructure. Five metallic brackets (0.022″ × 0.

What is the current state of artificial intelligence applications in dentistry and orthodontics?

Background: The use of Artificial Intelligence (AI) in the medical field has the potential to bring about significant improvements in patient care and outcomes. AI is being used in dentistry and more specifically in orthodontics through the development of diagnostic imaging tools, the development of treatment planning tools, and the development of robotic surgery. The aim of this study is to present the latest emerging AI softwares and applications in dental field to benefit from.

Comparison of shear bond strength and ARI of four different adhesive systems used to bond molar tubes: An in vitro study.

Objective: The purpose of this in vitro study was to determine and compare the shear bond strength and ARI score of one traditional etch-and-rinse adhesive system serving as control, with those of two other all-in-one adhesives but with enamel acid etching preceding their application, and of one new 8th generation all-in-one bonding agent combined with a traditional adhesive used to bond stainless steel buccal tubes to molar teeth.

Material And Methods: Four groups of teeth were formulated according to the adhesive system used to bond the tubes on the molars. Shear bond strength was measured using a universal testing machine (Hounsfield, UK).

CBCT in orthodontics: a systematic review on justification of CBCT in a paediatric population prior to orthodontic treatment.

Background: Taking into account radiation doses, safety, and protection, we highlighted the features in which cone-beam computed tomography (CBCT) can offer an advantage compared to the conventional two-dimensional imaging in paediatric dentistry before orthodontic treatment.

Objective: The aim of this article was to conduct a systematic review to assess the diagnostic efficacy of CBCT in the paediatric population at a pre-orthodontic phase.

Search Methods: MEDLINE via PubMed was searched to identify all peer-reviewed articles potentially relevant to the review until 1 July 2018.

Secondary implant stability outcome of immediate versus late placed variable-thread implants in the maxilla. A retrospective cohort study.

Background: The healing of xenograft augmentated intra-alveolar gaps following immediate implant placement (IMIP) after tooth extraction is likely to differ in time and density compared to the native bone part that directly contacts the implant.

Material And Methods: Secondary implant stability (SIS) data recorded 2-3 months following a late implant placement protocol (LIP) (n= 43) and 6-8 months following an immediate implant placement protocol (IMIP) (n=33) of variable-thread implants (Nobel Active™) in the maxilla were retrospectively collected from files of 63 patients (42 females, 21 males). Statistical analysis was performed using a generalized estimating equation model (GEE).

Updated secondary implant stability data of two dental implant systems. A retrospective cohort study.

Background: At present, updated secondary implant stability data generated by actual versions of resonance frequency analysis (RFA) and mobility measurement (MM) electronic devices of 2 different implant systems with actual manufactured surfaces seem to lack and/or are incomplete.

Material And Methods: Secondary implant stability data based on both RFA and MM measurements were collected and analyzed from 44 formerly treated patients (24 f, 20 m) that received either Ankylos Cellplus (Ø3.5mm) (A) (n=36) or Straumann regular neck SLA tissue level (Ø4.

ISQ calculation evaluation of in vitro laser scanning vibrometry-captured resonance frequency.

Background: Implant stability testing at various stages of implant therapy by means of resonance frequency analysis is extensively used. The overall measurement outcome is a function of the resulting stiffness of three entities: surrounding bone, bone-implant complex, and implant-Smartpeg complex. The influence of the latter on the overall measurement results is presently unknown.

The effect of various adhesives, enamel etching, and base treatment on the failure frequency of customized lingual brackets: a randomized clinical trial.

Objectives: The aim of this paper was to compare failure differences in precious metal customized lingual brackets bonded with three adhesive systems. Also, differences in failure of non-precious metal brackets with and without a silicatized base layer bonded with the same adhesive, as well as the influence of enamel etching prior to using a self-etching dual cure resin were explored.

Materials/methods: Five different groups were defined in a semi-randomized approach.

Maxillary changes with bone-borne surgically assisted rapid palatal expansion: A prospective study.

Introduction: The aim of this prospective study was to analyze the postexpansion positional changes of the maxillary halves and their initial stability after transpalatal distraction with a bone-borne distractor and standard corticotomies of the anterior, lateral, and median bony supports of the maxilla without pterygomaxillary disjunction.

Methods: The sample consisted of 21 patients (15 female, 6 male; mean age, 26 years 5 months). Measurements on the maxillary study casts and the posteroanterior cephalograms were obtained before surgery, at the end of palatal expansion, and 10 weeks later.

How orthodontic records can influence torque choice decisions?

Introduction: The aim of this study was to investigate whether the addition of records can influence intra- and inter-rated agreement on torque choices made to treat a group of patients with various malocclusions.

Methods: Forty-eight patients were presented to five orthodontic specialists in three different occasions. During the first session, the participants were shown only the models and intraoral photos of the patients; extraoral photos were added during the second session, and cephalometric X-rays were further supplemented during the third session.

On the augmented reproducibility in measurements on 3D orthodontic digital dental models and the definition of feature points.

Objective: The objective of this study was to explore digital measurement methodology on 3-dimensional (3D) dental models. Standardised manipulation and practices have lead to reliable measurements on plaster casts. Identifying landmarks on digital models or digitised plaster casts is fundamentally different from actual measurements.

[Concepts, evaluation methods, diagnostic and prognostic values of implant stability].

The outcome of oral implant treatment is in part focused on the obtained implant stability as outlined in the success criteria as propose by Albrektsson T. & Albrektsson B. (1987) and by Buser et al.

Clinical observations and success rates of palatal implants.

Introduction: Anchorage control is a challenge in orthodontics. Implants can be used to provide absolute anchorage.The aim of this study was to evaluate the success rates of palatal implants used for various anchorage purposes.

Glass fibre reinforced versus multistranded bonded orthodontic retainers: a 2 year prospective multi-centre study.

The objective of this study was to compare glass fibre reinforced (GFR) with multistranded bonded orthodontic retainers in terms of success rate and periodontal implications. A 2 year parallel study was conducted of 184 patients scheduled to receive bonded retainers in the upper and lower anterior segments. In three centres, the patients (mean age 14 years; 90 males and 94 females) were sequentially assigned to receive GFR retainers containing 500 unidirectional glass fibres (GFR500), 1000 unidirectional glass fibres (GFR1000), or multistranded retainers (gold standard).

Aspects in post-orthodontic removal of Orthosystem implants.

Objectives: Problems encountered in the removal of a temporary anchorage device, such as the Orthosystems implant, specially designed for orthodontic anchorage purposes after insertion at the palatal side of the maxilla, are presented and discussed.

Material And Methods: The removal of these osseo-integrated implants was originally described to be executed by means of bone cutting around the implant with a trephine explanation burr. However, situations can be encountered in which the orthodontic tooth movement resulted in close contact between the implant and neighbouring teeth or the nasal cavity.

Osseointegration of miniscrews: a histomorphometric evaluation.

Mini-implants and miniscrews are commonly used in orthodontics to provide additional temporary intraoral anchorage. Partial osseointegration represents a distinct advantage in orthodontic applications, allowing effective anchorage to be combined with easy insertion and removal. This article reports the histomorphometric findings of the osseointegration of bracket screw bone anchors (BSBAs).

Cytotoxicity of two bonding adhesives assessed by three-dimensional cell culture.

Objective: To determine the toxicity of orthodontic adhesives assessed on in vitro three-dimensional reconstructed human oral epithelium (RHOE).

Materials And Methods: Two adhesive primers, Transbond XT (3M, Monrovia, Calif) and Excite (Vivadent, Schaan, Liechtenstein), were tested. After topical exposure, the cell cultures were fixed, cut, and stained for light microscopy (LM) and transmission electron microscopy (TEM).

The use of three-dimensional oral mucosa cell cultures to assess the toxicity of soldered and welded wires.

The aim of the present study was to determine whether there is a difference in toxicity and loss of viability of three-dimensional (3D) reconstructed human oral epithelium (RHOE) cell cultures induced by point-welded (PW), laser-welded (LW), and silver-soldered (SiS) orthodontic wires. Three types of soldered stainless steel (SS) wires: PW, LW, and SiS were prepared (n = 3) and subjected to multiple end-point analysis (MEA). Six pieces were cut from each wire.

Toxicity of used orthodontic archwires assessed by three-dimensional cell culture.

The aim of the present study was to determine whether used orthodontic wires made of different materials cause toxicity and loss of viability on three-dimensional (3D) cell cultures. Three types of orthodontic wires, stainless steel, Nitinol, and TMA (n = 9) which had been used clinically in fixed appliances for a period of 1 month, were retrieved at random from five patients. Both upper and lower archwires were collected and subjected to two different protocols: to assess toxicity, two pieces of each wire were placed on 3D cell cultures (reconstituted human epithelium); to investigate the possibility of cell damage, the 3-(4,5-dimethylthiazol-2-yl)2,5-diphenyl tetrazolium bromide (MTT) assay was used and haematoxylin and eosin staining was performed to evaluate morphological changes.

Influence of a soft drink with low pH on enamel surfaces: an in vitro study.

Introduction: The purpose of this study was to investigate, in vitro, the short-term effect of a soft drink (Coca Cola, Coca Cola Company, Atlanta, Ga) with low pH on enamel surfaces at different levels of intake. Effects on labial and palatal surfaces were also compared.

Methods: Thirty human enamel blocks (labial and palatal enamel surfaces) were randomly divided into 5 groups-1 control and 4 experimental.