Spyridon N. Papageorgiou

Spyridon N. Papageorgiou
University of Zurich | UZH

About

183
Publications
82,291
Reads
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3,392
Citations
Additional affiliations
March 2022 - present
University of Zurich
Position
  • Deputy Director and Clinic Coordinator
January 2021 - present
King's College London
Position
  • Lecturer
October 2016 - March 2022
University of Zurich
Position
  • Research Assistant

Publications

Publications (183)
Article
Full-text available
Background Failure of eruption of the maxillary permanent incisor teeth usually presents in the mixed dentition between the ages of 7 and 9 years. Missing and unerupted maxillary incisors can be regarded as unattractive and have a potentially negative impact on facial and dental aesthetics. The presence of a supernumerary tooth (or odontoma) is com...
Article
Full-text available
There is an association between increased overjet and risk of trauma to the maxillary incisor teeth in children and adolescents. It would therefore seem sensible to recommend overjet reduction as early as possible to help reduce this risk. However, orthodontic outcomes are essentially the same whether you start treatment in the early or late mixed...
Article
Full-text available
Objectives Three-dimensional (3D) printing technology is a promising technique for fabricating custom orthodontic metallic appliances. Aim of this study was to assess the effect of intraoral aging on the mechanical / electrochemical properties of 3D-printed orthodontic metallic appliances. Methods Twelve molar orthodontic distalization appliances...
Article
Background Proper oral hygiene and absence of periodontal inflammation is pre-requisite for orthodontic treatment. Chlorhexidine (CHX) is an established oral antiseptic used in the treatment of periodontal disease, but its role in orthodontic therapy is unclear. Objectives To assess the efficacy of adjunct use of CHX-containing products in maintai...
Article
Purpose Adequate control of the vertical dimension is of great importance in orthodontic treatment. Although existing evidence is very limited, extraction of four premolars is thought to contribute towards improved control of anterior facial height compared with non-extraction treatment protocols. Thus, the aim of this retrospective cohort study wa...
Article
Full-text available
Early orthodontic treatment in the mixed dentition aims to simplify definitive treatment in the permanent dentition. In Class III cases, this can be an effective strategy for the management of a local anterior crossbite, using either a removable or simple fixed appliance. For more significant Class III malocclusions, the decision to intervene early...
Article
Full-text available
PURPOSE Adequate control of the vertical dimension is of great importance in orthodontic treatment. Although existing evidence is very limited, extraction of four premolars is thought to contribute towards improved control of anterior facial height compared with non-extraction treatment protocols. Thus, the aim of this retrospective cohort study wa...
Article
Introduction Orthodontic aligners printed with in-office 3-dimensional (3D) procedures have been described, but no data on their biocompatibility exist. This study investigates the cytotoxicity and estrogenicity of a 3D-printed orthodontic aligner by assessing its biological and behavioral effects. Methods Ten sets of 1 type of aligner were immers...
Article
Objectives: In systematically healthy patients with an implant-supported fixed restoration (P), what is the influence of thin (E) as compared to thick (C) peri-implant soft tissues on aesthetic outcomes (O)? Methods: Following an a priori protocol, a literature search of six databases was conducted up to August 2020 to identify prospective/retro...
Article
Full-text available
Introduction: Dentists' knowledge and expertise, especially in their early career, is primarily shaped during undergraduate studies. This cross-sectional study aimed to assess the knowledge and perception of Syrian under- and post-graduate students regarding diagnosing and managing Molar-Incisor Hypomineralisation (MIH)-affected teeth. Materials...
Article
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Objectives Three-dimensional (3D) printing technology is an emerging manufacturing process for many orthodontic appliances, and the aim of this study was to evaluate the mechanical properties of resin-based materials as alternatives for the in-house preparation of orthodontic brackets. Material and Methods Two types of 3D printed resins used for t...
Article
Full-text available
Aim: To assess the frequency and quantity of interproximal contact loss (ICL) between implant restorations and adjacent teeth after at least 10 years of follow-up (FU). Methods: Thirty-nine patients (median age 57.3 years) with 80 implants were re-examined at least 10 years after insertion of final restorations (single-crowns or fixed dental pro...
Article
Aim The aim of this international survey was to assess knowledge concerning the design, conduct, critical appraisal and synthesis of clinical studies among senior orthodontic postgraduate residents. Materials and methods Senior postgraduate residents from four universities in Europe and the United States were invited to complete a custom questionn...
Article
Objective The purpose of this investigation of untreated monozygotic and dizygotic twins was to identify the genetic and environmental component to the facial soft tissue growth. Settings and Sample Population The sample consisted of 52 untreated monozygotic twins (36 male, 16 female) and 46 untreated dizygotic twins (23 male, 23 female) from the...
Article
Full-text available
Objectives To identify the 10 most numerically prolific authors publishing in the field of orthodontics for each year over the last decade (2011-2020), describe the characteristics of these outputs and identify trends in the types of study being published. Materials and Methods A Scopus literature search was conducted to identify the 10 most numer...
Article
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The mammalian dentition is a serially homogeneous structure that exhibits wide numerical and morphological variation among multiple different species. Patterning of the dentition is achieved through complex reiterative molecular signaling interactions that occur throughout the process of odontogenesis. The secreted signaling molecule Sonic hedgehog...
Article
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Background Orthodontic patients wearing fixed appliances are susceptible to traumatic dental injuries during a wide range of sporting activities. This randomized clinical trial investigated wearability and preference of mouthguards during sporting activities in patients undergoing orthodontic treatment with fixed appliances. Methods A prospective...
Article
Introduction A key goal of orthodontic treatment with fixed appliances is alignment of the dentition, and this remains a commonly selected outcome in clinical studies investigating orthodontic tooth movement. This systematic review has evaluated treatment duration to achieve alignment of the mandibular dentition using fixed appliances. Methods Sys...
Article
Full-text available
Background Knowledge obtained at the undergraduate level regarding molar incisor hypomineralisation (MIH) has an impact on future practice of dentists and paediatric dentists. This cross-sectional study aimed to assess final-year dental students’ knowledge, attitudes and beliefs towards MIH in all Swiss universities. Methods A previously utilised...
Article
Full-text available
Objective Aim of this study was to compare the mechanical properties of orthodontic aligners among different commercially available 3D printing devices. Materials and Methods Five 3D printers (Ka:rv LP 550, Swinwon; “KAR”), (L120, Dazz 3D; “L12”), (MiiCraft 125, Miicraft Jena; “MIC”), (Slash 2, Uniz; “SLS”) and (Pro 95, SprintRay; “PRO”) were used...
Article
Full-text available
PURPOSE Orthodontic fixed appliances have been proven to be effective in treating a wide variety of malocclusions, and different types of appliances have emerged during recent decades. However, the comparative effects of different appliances have not been adequately assessed. Thus, the aim was to assess the occlusal outcome of orthodontic treatment...
Article
Full-text available
Aim To assess the beneficial and adverse effects of periodontal-orthodontic treatment of teeth with pathological tooth flaring, drifting and elongation in patients with severe periodontitis on the dental and periodontal tissues. Materials and methods Nine databases were searched in April 2020 for randomized/non-randomized clinical studies. After d...
Article
Full-text available
Background: Orthodontic patients wearing fixed appliances are susceptible to traumatic dental injuries during contact-sport. This laboratory study investigated the protective qualities of orthodontic mouthguards using impact-testing to a typodont fitted with a fixed appliance through peak load transfer and retention of the mouthguard. Methods: S...
Article
Objective: To investigate alterations in the mechanical properties of in-house three-dimensional (3D) printed orthodontic aligners after intraoral ageing. Materials and methods: Sixteen 3D-printed aligners (TC-85DAC resin, Graphy, Seoul, Korea) were used for the purpose of the study, which were divided into 10 control (not used) aligners and 6 m...
Article
Full-text available
Objectives Mandibular collum fractures among growing patients can lead to abnormal growth, function, esthetics, and ultimately quality of life. Among the proposed treatment alternatives, orthopedic treatment with functional appliances has been suggested, with encouraging results. Aim of the present systematic review was to critically appraise exist...
Article
Full-text available
Background Even though treatment of Class II malocclusion with premolar extractions and incisor retraction might affect incisor inclination and soft tissue profile, the effects of bracket prescription on this have not been thoroughly assessed. Methods Fifty patients (mean age: 13.6 years; 34% male) receiving extraction-based treatment with either...
Article
Objective: To assess three rapid maxillary expansion (RME) appliances in nasal ventilation. Trial design: Three-arm parallel randomized clinical trial. Methods: Sixty-six growing subjects (10-16 years old) needing RME as part of their orthodontic treatment were randomly allocated (1:1:1 ratio) to three groups of 22 patients receiving Hyrax (H)...
Article
Full-text available
Objectives To determine the additive genetic and environmental contributions to the vertical growth of craniofacial structures. Materials and Methods The sample consisted of 64 untreated monozygotic (44 male, 20 female) and 61 untreated dizygotic twins (32 male, 29 female). Lateral cephalograms taken at 15 and 18 years of age were traced to analyz...
Article
Full-text available
Purpose Orthodontic fixed appliances have been proven to be effective in treating a wide variety of malocclusions, and different types of appliances have emerged during recent decades. However, the comparative effects of different appliances have not been adequately assessed. Thus, the aim was to assess the occlusal outcome of orthodontic treatment...
Article
Full-text available
Aim of this systematic review was to assess the effects of orthopedic treatment for Class II malocclusion with Functional Appliances (FAs) on the dimensions of the upper airways. Eight databases were searched up to October 2020 for randomized or nonrandomized clinical studies on FA treatment of Class II patients with untreated control groups. After...
Article
Full-text available
This observational study compared palatal rugae morphology in adolescent subjects with normal tooth number and tooth agenesis. Maxillary dental study casts were used to compare rugae number, length and shape. Each study group contained 60 subjects (30 females and 30 males) mean age 13.4 (SD, 1.55) in control and 13.56 (SD, 1.54) years in tooth agen...
Article
PurposeTo compare the clinical failure rate of two resin-modified glass ionomer cements (RMGICs) used for Class II primary molar restorations over a 3-year period.Methods Healthy, cooperative children aged 4–8 years with carious, asymptomatic primary molars requiring class II restorations received either nano-filled (Ketac Nano, 3 M ESPE) or regula...
Article
Full-text available
Purpose: To assess the knowledge of postgraduate dental students about evidence-based methodology pertaining to the design, conduct, and critical appraisal of clinical trials. Materials and methods: Senior postgraduate students were surveyed from the dental schools of three universities in Athens (Greece), Boston (USA), and Zürich (Switzerland)....
Article
Full-text available
Objectives: Adults with fixed orthodontic appliances are increasing nowadays. Compared with adolescents, adults present biological differences that might influence treatment duration. Therefore, the aim of the study was to compare duration of treatment with fixed appliances between adults and adolescents. Materials and methods: Eight databases w...
Poster
Introduction: The optimal treatment for rheumatoid arthritis (RA), bearing no adverse effects, remains to be found. Most of the used medications carry various adverse effects, which affect the quality of life, psychological status and the degree of adherence to the therapeutic protocols. Anecdotal evidence has suggested that fasting could be employ...
Article
Full-text available
The aim of this systematic review is to compare the effect on the upper airways of orthopedic treatment for skeletal Class III malocclusion with untreated controls. Nine databases were searched up to August 2020 for randomized or nonrandomized clinical trials comparing orthopedic Class III treatment (facemask or chin-cup) to untreated Class III pat...
Article
Orthodontic treatment with sequential aligners has seen a considerable surge in the last decades, and is currently used to treat malocclusions of varying severity. To enhance tooth movement and broaden the spectrum of malocclusions that can be treated with aligners, composite resin attachments are routinely bonded with the acid-etch technique on mu...
Article
Introduction: This prospective clinical cohort study investigated the potential influence of obesity on orthodontic treatment outcome. Methods: A prospective cohort of adolescent patients undergoing routine fixed appliance treatment were recruited into normal-weight or obese groups based upon body mass index (BMI) centile and followed up until t...
Article
Objective: To assess upper airway volume changes after rapid maxillary expansion (RME) with three different expanders. Trial design: Three-arm parallel randomized clinical trial. Methods: Sixty-six patients, 10-16 years old, in permanent dentition, with maxillary transverse deficiency were recruited and assigned with block randomization (1:1:1...
Article
Full-text available
Use of thermoplastic material in orthodontics, either as aligner or as retainer appliances, is common practice and is likely to increase in the years to come. However, no systematic assessment on safety considerations of these adjuncts has been implemented up to date. The aim of this systematic review was to collectively appraise the existing evide...
Article
Introduction This split-mouth trial aimed to investigate the effect of low-level laser therapy (LLLT) on the amount of maxillary canine distalization when applied every 4 weeks over 12 weeks. Methods Twenty-two adolescents and young adults (15 female, 7 male; aged 13-25 years; n = 22) requiring bilateral maxillary first premolar extractions were r...
Article
Background: The aim of this retrospective cohort study was to assess long-term occlusal changes at debond and a median of 8 years afterwards (in retention) with the American Board of Orthodontics (ABO) objective grading system and identify risk factors. Materials and method: Fifty patients (median age: 14.3 years at debond; 60% female) treated w...
Article
Full-text available
Background: Juvenile idiopathic arthritis (JIA) can cause osseous deformity in the temporomandibular joint (TMJ) and may impair mandibular growth. This study aimed to evaluate whether facial asymmetry determined clinically or by morphometric analysis of three-dimensional (3D) photographs in JIA patients is associated with an asymmetric affection o...
Chapter
Treatment of teeth with mild molar incisor hypomineralization (MIH) often includes conservative approaches like prophylaxis and desensitization in order to remineralize the lesions, reduce tooth sensitivity, or minimize enamel breakdown and caries. This chapter describes the different approaches suggested for prophylaxis and desensitizing of MIH te...
Article
Background: The use of orthodontic aligners to treat a variety of malocclusions has seen considerable increase in the last years, yet evidence about their efficacy and adverse effects relative to conventional fixed orthodontic appliances remains unclear. Objective: This systematic review assesses the efficacy of aligners and fixed appliances for...
Article
Objective: The aims of this longitudinal analysis of untreated monozygotic and dizygotic twins were to investigate vertical changes of the craniofacial structures during growth, to determine the concordance between genetically twins, and to assess the genetic component for the various aspects of vertical growth. Settings and sample population: T...
Article
Objective To assess the treatment efficacy/efficiency with prefabricated myofunctional appliances (PMA) for children with malocclusion. Data sources Nine databases searched without limitations till July 2019. Data selection Randomised trials comparing PMAs to functional appliance treatment or no treatment. Data extraction Study selection, data e...
Article
We thank our colleagues for their thoughtful remarks
Article
The following description of a retrospective non-randomized study is given within a publication in a scientific journal: “A total of 54 consecutive patients (24 male / 28 female; mean age: 14.1 years) treated with sequential thermoplastic aligners during the last 12 months were identified from the archive of a private practice. They were compared t...
Article
Full-text available
Background: The aim of the current systematic review was to compare the radiologic effects of functional appliance Class II treatment compared to no treatment on the temporomandibular joint and its components. Methods: Nine databases were searched up to June 2019 for randomized or prospective non-randomized clinical trials comparing Class II pat...
Article
Objectives: To evaluate the biological and mechanical complications of angulated abutments on full-arch and partial jaw rehabilitations with a follow up for at least 1 year. Methods: Electronic search was carried out in MEDLINE, Embase, and Web of Science. Studies published between January 2000 and January 2019 were included. The quality of the...
Article
Full-text available
Objectives This study was conducted in order to investigate whether enamel sandblasting as an adjunct or substitute to the acid-etch technique has an effect on the shear bond strength (SBS) and fractography of the bracket-adhesive-enamel complex using the DIN 13990:2017-04 standard. Materials and methods Upper central incisor brackets (discovery®,...
Article
An orthodontist attends the scientific orthodontic congress and passing by the company exhibitions receives a free sample of a novel orthodontic archwire introduced in the market for initial alignment/levelling with favourable performance over conventional superelastic nickel-titanium archwires. This novel archwire should increase according to the...
Article
Objective To assess the efficacy of preventive interventions against the development of White Spot Lesions (WSLs) during fixed appliance orthodontic treatment. Setting and sample population Systematic review with meta‐analysis. Materials and Methods Nine databases were searched without limitations in September 2018 for randomized trials. Study sel...
Article
Objective: To investigate the effects of orthodontic forced eruption (OFE) with the straight-wire appliance in the dimensions of the alveolar process when used for extracting compromised maxillary anterior teeth and implant site development. Material and methods: Cone-beam computed tomography (CBCT) scans of 7 patients needing extraction of 17 m...
Article
Objective: The aim of this study was to explore the methods, reporting and transparency of clinical trials in orthodontics and compare them to the field of periodontics, as a standard within dentistry. Design/setting: Cross-sectional bibliographic study. Methods: A total of 300 trials published in 2017-2018 and evenly distributed in orthodonti...
Article
Objective: This cross-sectional study aimed to explore the level of knowledge and expectations people deciding on a future orthodontic treatment have about post-orthodontic retention and to investigate the influence of sociocultural characteristics. Material and methods: A total of 227 consecutive people involved as legal decision maker (as pati...
Article
Why are there so many systematic reviews in orthodontics, and what are the negative consequences of this for our speciality as an academic discipline?