Luis Tomas Huanca Ghislanzoni

University of Geneva | UNIGE · Department of Orthodontics

Aim: To evaluate maxillary and mandibular dental arch changes induced by a passive self-ligating system by analysing digital dental casts. Subjects and methods: A sample of 25 growing patients (16 females and 9 males, mean age 12.8 years) treated with passive self-ligating brackets was compared to a sample of 25 untreated controls (15 females and 1...

Intrusion is not easy to achieve with preadjusted edgewise appliances, which rely on the resilience of the nickel titanium or stainless steel archwires as they return to their original shapes. If brackets are strategically bonded at differential heights, the result may be an undesirable change in torque expression. As an alternative, several author...

Upper molar distalization supported by miniscrews has become increasingly popular in the last years. A detailed clinical and lab procedure for the realization of a distalization appliance (fast back or distal jet) connected to miniscrews inserted in the anterior region of the palate is presented. A case report illustrates the use of a fast back app...

Objective: To evaluate treatment and posttreatment dentoskeletal effects induced by the Forsus device (FRD) in growing patients with Class II malocclusion in a retrospective controlled clinical study. Materials and methods: Thirty-six Class II patients (mean [SD] age 12.3 [1.2] years) were treated consecutively with the FRD protocol and compared...

Objectives. To evaluate the accuracy and reproducibility of measurements obtained using the Bellus3D Face Application on a mobile smartphone by comparing them to direct measurements on pre-marked and blank face scans. Materials and Methods. Twenty-five healthy young adults (six males and nineteen females; age range 20–30 years) were included in thi...

Smile aesthetics are increasingly prioritized in dental practice, with accurate orthodontic assessment and treatment planning being crucial for optimal outcomes. This study evaluates Invisalign® SmileView™ (SV), an AI-based tool that simulates post-treatment smiles, focusing on its ability to present potential orthodontic outcomes to patients. Back...

Objective The aim of this study was to evaluate changes in shape of the palatal vault after maxillary expansion with hyrax expander (HE) and leaf expander (LE), using 3D Geometric Morphometric Analysis. Setting and Sample Population Overall, 250 patients (110 M, 140 F) with maxillary transverse deficiency were selected for this study. In this stud...

Objectives To evaluate three‐dimensional movements of maxillary teeth during headgear treatment in Class II growing children, using digital analytical tools, and to determine the effects of compliance on these movements. Materials and Methods A 9‐month parallel‐group randomized controlled trial was carried out on 40 children with Class II malocclu...

Introduction This study aimed to compare achieved movements with predicted movements after 28‐week use of Invisalign Lite aligners. Settings and Sample Population The digital impressions of 21 subjects treated with Invisalign Lite at a private practice and in the dental clinic (Milan, Italy) were taken and analysed. Subjects were Caucasian with a...

Objectives To investigate the accuracy of torque, tip and rotation and linear intra-arch movements yielded by passive self-ligating lingual straight-wire appliances with brackets featuring square slots. Materials and methods Twenty-five adult Caucasian patients (16 females and 9 males; mean age 26.5 ± 4.3 years) with Class I or mild Class II head-...

Introduction: This study aimed to obtain information on the relationship between crown and root in terms of morphology - dimensions and crown-root angles -to be used for orthodontic set-ups without the use of radiological examinations. Material and methods: All the good quality CBCTs of patients obeying the eligibility criteria, from 2000 to 201...

Objective: Controlling the incisal inclination is fundamental in orthodontics. However, the relationship between the inclination prescription and its clinical outcome is not obvious, and the incisal inclination changes generated by different bracket prescriptions were investigated. Methods: Twenty-eight non-extraction dental Class II patients (1...

Objectives To analyze the accuracy of planned tooth movements of torque, tip, rotations, and transverse width values with lingual straight-wire technique. Materials and Methods 40 Caucasian subjects with mean age of 23.9 years, consecutively treated in private practice with a lingual straight-wire appliance (STb, Ormco, Glendora, Calif) were evalu...

Objectives We aimed to investigate associations between sella turcica dimensions and maxillary growth in children with unilateral cleft lip and palate (UCLP) Methods Forty-nine patients with non-syndromic UCLP, prior to secondary alveolar bone-grafting, were included. The outcomes measured were sella turcica and maxillary cephalometric measurement...

Background: Clear aligners treatment (CAT) is a common solution in orthodontics to treat both simple and complex malocclusions. This study aimed to evaluate the predictability of CAT, comparing the virtually planned and the achieved tooth movement at the end of stage 15, which is often the time of first refinement. Methods: Seventeen patients (m...

Objective To obtain reference values for tip, torque and in-out from digital models of Italian and Mozambican subjects in ideal occlusion using a repeatable and validated method and to compare these measurements with previously reported values. Material and Methods Dental parameters were acquired from digital models of each subject, categorized to...

Aim To investigate differences in sella turcica size and bridging in children with unilateral cleft lip and palate (UCLP) with or without concomitant dental anomalies. Patients and Methods A cross-sectional study was carried out looking at 56 children with nonsyndromic UCLP. Lateral cephalograms, taken before alveolar bone grafting, were used to a...

Background: The patients' request for treatment with clear aligners is constantly increasing. The aligners permit to the clinicians a valid way to solve a lot of orthodontic cases but the patients' compliance and the clinicians' capabilities and knowledge of the technique is fundamental for the outcome. Methods: Seventy-two digital models of 18 co...

Intraoral scanners are widely used today, and virtual models have replaced plaster casts in most orthodontic offices. Pretreatment scans can now be stored in the cloud. Most clinicians transmit digital models to their preferred clear-aligner provider, whether it’s a well-known firm or an in-house lab. Nevertheless, only a minority use digital scans...

Objective The present study aimed to analyze palatal changes due to rapid maxillary expansion (RME) by using modern geometric morphometric analysis (GMA) on 3D models. Settings and sample population Forty children with posterior crossbite and maxillary deficiency were selected for this study. Twenty children were treated with RME (mean age 7.4 ± 0...

Objective To use morphometric methods to investigate the size and shape of the sella turcica in children with unilateral cleft lip and palate (UCLP). Setting and Sample Population Fifty‐six healthy children with non‐syndromic UCLP, from a major pediatric teaching hospital, with lateral cephalograms taken prior to alveolar bone grafting, were compa...

Purpose: To investigate whether functional factors estimated by the masseter muscle thickness (MMT) and the maximum occlusal force (MOF), were associated with the amount of continuous eruption of maxillary incisors in adults. Materials and methods: Dental casts were taken twice in 24 adult female patients during a 10-year prospective cohort stud...

Introduction: Self-ligating appliances are purposed to expand the arches, but evidence on stability of the result is lacking. We measured the width of maxillary and mandibular arches and torque changes after treatment with the use of passive self-ligating appliances and assessed stability at the 2-year follow-up. Methods: Maxillary and mandibula...

Objective: To accurately describe compliance in headgear wearing time by using a temperature- and force-sensitive device over an 8 month period of use in a prospective clinical manner. Materials and methods: Twenty children with Class II malocclusion aged 8-12 years were randomly selected for treatment with cervical headgear. The headgears were...

Background: Low-frequency vibrations have been proposed as a means of accelerating tooth movement and reducing orthodontic treatment times. Objective: To determine any differences in the accuracy of dental movement in patients treated with a low-frequency vibration aligner protocol and/or by reducing the aligner replacement interval with respect...

The aim of this study was to test for dimensional variations between plaster models recorded with alginate impression and printed 3D physical replicas from an .stl file digitized with an intra-oral scanner. Eighty arches (maxillary and mandibular) from 40 different patients were analyzed. Classic alginate impressions and digital recordings with an...

Background The aim of this study was to evaluate the predictability of F22 aligners (Sweden & Martina, Due Carrare, Italy) in guiding teeth into the positions planned using digital orthodontic setup. Methods Sixteen adult patients (6 males and 10 females, mean age 28 years 7 months) were selected, and a total of 345 teeth were analysed. Pre-treatm...

Background Geometric morphometrics (GMM) has been traditionally applied to the field of biology to study developmental differentiations between species. Orthodontics deals with the shape and size of the face and its components. While several tools have been used to measure size, proportions, and relations between anatomical components, shape has be...

Introduction: Forsus is a useful appliance for non-compliant Class II problems, however various problems can occur when using them. Objective: To demonstrate a comprehensive series of of critical situations that can occur using the Forsus device and to provide the possible solutions of each complication. Materials & Method: The clinical management...

Background Continuous physiologic eruption of teeth may become a main aesthetic issue for implants inserted in the maxillary anterior region. Purpose To study maxillary tooth vertical changes during a 10 years period by 3-dimensional superimposition of digital dental casts. Material and methods Alginate impressions were taken at both baseline an...

Background: The effects of rapid maxillary expansion (RME) have been widely studied with classic bidimensional imaging. Objectives: This study aimed to study immediate post-expansion effect of RME with three-dimensional (3D) imaging. Patients and Methods: Computed tomography (CT) low dose scans records were taken for three patients before applying...

The present study aimed to describe longitudinal palatal shape changes in post-stroke patients when compared to a sample of healthy subjects through linear measurements and geometric morphometrics. The 3D palatal scanned models of seven stroke patients having a 1-year post-stroke follow up were matched with seven control subject of the same age gro...

BACKGROUND: The purpose of this controlled study was to investigate indirect effects on mandibular arch dimensions, 1 year after rapid palatal expansion (RPE) therapy. METHODS: Thirty-three patients in mixed dentition (mean age 8.8 years) showing unilateral posterior crossbite and maxillary deficiency were treated with a RPE (Haas type) cemented on...

INTRODUCTION: Mesiodens is the most common type of supernumerary tooth with proportion of males:females of 2:1. The etiology of this anomaly is various and includes both genetic and environmental factors, syndromic conditions and disturbances in dental development. CASE PRESENTATION: A palatally positioned maxillary midline mesiodens was incidental...

Objective: To analyze variations in palatal morphology in subjects presenting unilaterally impacted maxillary permanent central incisors compared with a control group of subjects without eruption anomalies using a three-dimensional (3D) analysis. Materials and methods: Twenty-six white subjects (10 girls and 16 boys; mean age 9.5 ± 1.5 years) wi...

Introduction: The aims of this study were to evaluate the differences between 2 regions of maxillary voxel-based registration and to test the reproducibility of the registration. Methods: Three-dimensional models were built for before-treatment (T1) and after-treatment (T2) based on cone-beam computed tomography images from 16 growing subjects....

This randomized-controlled trial studied the efficacy of palifermin, administered as a dose during HSCT therapy, as primary prophylaxis on paediatric patients with Acute lymphoblastic leukemia in order to reduce Oral Mucositis. Patients in the palifermin group were randomly assigned to receive Palifermin, 60 μg/kg, intravenously as a single dose 3...

To compare the dental effects produced by a bonded versus a banded expander combined with facial mask (FM) in patients with Class III malocclusion by means of digital dental casts. Two groups of patients with Class III malocclusion and maxillary transverse deficiency in the deciduous or early mixed dentition were selected. The first group consisted...

Objective: To assess maxilla and mandibular arch widths' response to Haas-type rapid maxillary expansion (RME) anchored to deciduous vs permanent molars on children with unilateral posterior crossbite. Materials and methods: Seventy patients with unilateral posterior crossbite recruited at the Universities of Genova, Siena, and Insubria (Varese)...

Objective: To compare the anatomical characteristics of the maxillary arch, identified as palatal surface area and volume, between mouth-breathing and nose-breathing subjects using a three-dimensional (3D) analysis of digital dental casts. Methods: Twenty-one Caucasian subjects (14 females and 7 males) with a mean age of 8.5 years [standard devi...

Objective To evaluate the active-treatment effects of the Forsus fatigue resistant device (Forsus) during comprehensive correction of Class II malocclusion in growing patients. Methods Fifty-four patients (mean age, 12.5 ± 1.2 years) with Class II division 1 malocclusion were consecutively treated with fixed app-liances in combination with Forsus....

Background This study tested the validity of, and describes, a novel method of constructing an average morphology of the dental arch. Methods Upper dental arches of adult patients with a sound full permanent dentition were selected for the study. Laser-scanned images of the dental casts were obtained with an optical laser scanning device. The scan...

Objectives Three-dimensional virtual models are described. Since orthodontic manufacturers have been for long almost the only operators in the field, orthodontists are non familiar with this imaging instrument. Times are ripe for the use of three-dimensional virtual casts in everyday clinical practice and research. Materials and methods This paper...

The objectives of this study were to develop and validate a novel analysis protocol to measure linear and angular measurements of tip and torque of each tooth in the dental arches of virtual study models. Maxillary and mandibular dental casts of 25 subjects with a full permanent dentition were scanned using a three-dimensional model scanner. Sixty...

Class III treatment. Because the fit of the chin cup is not customized for each patient, however, poor adaptation often causes skin irritation and even mild swelling, with a negative effect on compliance. Suggestions for avoiding such irritation have included placing a soft, natural-fiber cloth between the chin and the cup or taking an alginate imp...

In this article, we report the successful use of miniscrews in the distalization of the lower dentition to correct an Angle class III malocclusion with lower anterior crowding in a dolichofacial adult patient. Conventional intraoral and extraoral appliances have many disadvantages, including the need for patient cooperation, potential for anchorage...

The objective of this study is to evaluate the effect of timing on Mandibular Anterior Repositioning Appliance (MARA) and fixed appliance treatment of Class II malocclusion in a prospective clinical trial. The treated sample consisted of 51 consecutively treated patients at prepubertal (n = 21), pubertal (n = 15), and postpubertal (n = 15) stages o...

To evaluate the treatment and posttreatment dentoskeletal effects induced by the Mandibular Advancement Repositioning Appliance (MARA) in the treatment of Class II malocclusion. The treated sample consisted of 23 consecutively treated patients at prepubertal or pubertal stages, as assessed by the cervical vertebral maturation method. A control grou...

To evaluate morphologic characteristics of occlusion (contact points, contact areas, and frequency of contact) in clinically successful patients 1 year after orthodontic and surgical-orthodontic therapy followed by passive retention. Twenty-two orthodontic and 18 surgical-orthodontic patients were analyzed. All patients were treated with standard e...