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Author: Benedict Wilmes (51)


Nov
2017

To (1) quantify the three-dimensional treatment effect of a Mesialslider appliance using superimposed digital models, (2) to evaluate anchorage loss (measured by incisor displacement), and (3) to assess agreement between two different matching approaches, i.e., control point (CP)-based and iterative closest point (ICP) matching.

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Jul
2017

Treatment outcomes are frequently evaluated based on the superimposition of digital dental models. However, errors from surface matching may distort these findings. The aims of this study were (i) to develop a simulation unit to mimic point set registrations and (ii) to evaluate the impact and clinical relevance of manual landmark selection errors on registration accuracy.

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Sep
2016

Successful intervention in a developing Class III malocclusion with facemask protraction therapy depends on a patient's ability to adhere to the recommendations for duration of appliance wear. In this article, we report the introduction of a novel approach for tracking of the duration of application of a protraction facemask, with the incorporation of a "FaceMon" sensor (TheraMon, microelectronic system; MC Technology GmbH, Hargelsberg, Austria) to track wear time. A 9-year-old boy with a Class III malocclusion was successfully treated with a modified alternate rapid maxillary expansion and constriction protocol and intermittent application of a hybrid hyrax-protraction facemask combination.

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May
2016

The aim of the present study was to assess the skeletal, dental and soft tissue effects of a specific treatment protocol in consecutively treated patients who presented with a Class III malocclusion. Treatment involved the use of a Hybrid Hyrax (HH) in the maxilla, a Mentoplate in the mandible and the application of continuous intra-oral Class III elastics.
The treated group was comprised of seven males and seven females (mean pretreatment age 10.

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Nov
2015

Recently, skeletal anchorage devices have been used as anchorage units for upper molar intrusion as a way of correcting an anterior open bite malocclusion. To avoid the surgical procedures associated with the placement of miniplates in the zygomatic area, mini-implants may be inserted palatally or buccally in the alveolar process. However, consideration must be given to the potential risks of root damage and a higher failure rate associated with the placement of temporary anchorage devices (TADs) in the interradicular area.

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Dec
1969

Protraction facemask has been advocated for treatment of class III malocclusion with maxillary deficiency. Studies using tooth-borne rapid palatal expansion (RPE) appliance as anchorage have experienced side effects such as forward movement of the maxillary molars, excessive proclination of the maxillary incisors, and an increase in lower face height. A new Hybrid Hyrax bone-anchored RPE appliance claimed to minimize the side effects of maxillary expansion and protraction.

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May
2015

The present case report describes the orthodontic treatment and long-term follow-up of an adult female patient (27 years) who was diagnosed with a mild Class III malocclusion characterised by an anterior and lateral open bite and three periodontally-compromised first permanent molars.
The aim of treatment was to provide an acceptable aesthetic and functional occlusion while, at the same time, improving the periodontal prognosis.
The patient was treated with fixed orthodontic appliances utilising direct and indirect skeletal anchorage derived from two mini-screws placed in the palate and one mandibular buccal mini-screw.

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Nov
2014

A treatment objective of upper molar distalisation may often be required during the correction of a malocclusion. Distalisation is not only indicated for the management of Class II patients, but also for Class III surgery patients who require decompensation in the upper arch if upper incisor retrusion is needed. Unfortunately, most conventional intra-oral devices for non-compliance maxillary molar distalisation experience anchorage loss.

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Sep
2015

To evaluate the treatment effects of a hybrid hyrax-facemask (FM) combination in growing Class III patients.
A sample of 16 prepubertal patients (mean age, 9.5 ± 1.

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Sep
2014

Growing class III patients with maxillary deficiency may be treated with a maxillary protraction facemask. Because the force generated by this appliance is applied to the teeth, the inevitable mesial migration of the dentition can result in anterior crowding, incisor proclination and a possible need for subsequent extraction therapy. The Hybrid Hyrax appliance, anchored on mini-implants in the anterior palate, can be used to overcome these side-effects during the facemask therapy.

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Oct
2013

Aim of the study was to assess the impact of the length of mini-implants inserted in the midpalatal region on the stability at the initial healing period.
A sample of 20 consecutively treated patients (15.6 ± 7.

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May
2013

The aim of this in study was the evaluation of treatment outcomes after using a hybrid hyrax-facemask combination in growing class III patients.
Treatment of 16 children (mean age 9.5±1.

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Dec
2013

Over the last years, a tendency to prefer purely intra-oral appliances with minimal need for patient cooperation is noticed if upper molars should be distalized. Unfortunately, most of the conventional devices for non-compliance upper molar distalization produce unwanted side effects such as anchorage loss. To minimize or eliminate anchorage loss, mini-screws attracted a great attention in recent years because of minimal surgical invasiveness and low cost.

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Jan
2014

To evaluate the changes of mini-implant stability over the initial healing period in humans.
A sample of 19 consecutively treated patients (mean age 15.5 ± 7.

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Nov
2013

To assess the effect of wear-time recording on subjective and objective wear time.
This study retrospectively examined a group of 18 patients and a control group of 14 patients at four appointments over 168 days. The patients were treated with removable appliances with embedded TheraMon-microsensors to be worn for 15 hours per day.

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Mar
2013

In this study, we aimed to assess the ability of a new viscoelastic finite element method model to accurately simulate rapid palatal expansion with a miniscrew-supported hybrid hyrax appliance.
A female patient received 3-dimensional craniofacial imaging with computed tomography at 2 times: before expansion and immediately after expansion, with the latter serving as a reference model for the analysis. A novel approach was applied to the finite element method model to improve simulation of the viscoelastic properties of osseous tissue.

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Sep
2012

Orthodontists are continuing to increase the use of mini-implants as a source of skeletal anchorage. However, the relatively high 16.4% rate of their failures remains a problem.

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Mar
2013

To investigate whether resonance frequency analysis (RFA) is suitable to measure orthodontic mini-implant stability. Implant size significantly affects the level of resonance frequency. Regarding the operating mode of RFA, it has to be proven whether the resonance frequency of mini-implants in bone fits the range of frequency emitted by the Osstell ISQ device.

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Aug
2011

Sufficient primary stability is of importance for the survival of orthodontic mini-implants. This means that adequate torque has to be achieved during insertion. However, as moments exceeding the fracture resistance of a mini-implant may result in their fracture, the maximum torque load capacity should be known.

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Dec
1969

Distal movement of maxillary molars is a reasonable but often challenging treatment alternative for patients with a dental Class II occlusion and an increased overjet or anterior crowding. One problem is that most of the conventional noncompliance devices that distally move maxillary molars lead to some anchorage loss. As such, a new appliance was designed that is connected to two coupled mini-implants with exchangeable abutments.

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Dec
1969

Rapid palatal expansion (RPE) is used for treatment of skeletal crossbites. It may be combined with a face mask if the maxilla is to be protracted. Conventional tooth-borne appliances rely on an almost complete dentition to transmit the relatively high forces to the bony structures of the maxilla and midface.

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Sep
2009

Air-polishing devices (APDs) are used to clean and polish tooth surfaces. The objective of this study was to examine the effects of exposing orthodontic wires and brackets to different types of powder when using an APD.
Three different wire materials (steel, TMA, Ni-Ti) were polished using an APD (Air-Flow((R)) S1), Clinpro Prophy and Air-Flow((R)).

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Aug
2009

The aim of the study was to evaluate whether resonance frequency analysis (RFA) using a wireless transducer can be used to assess the primary stability of orthodontic mini-implants.
Fifteen orthodontic mini-implants were placed in three ilium bone segments of country pigs. The wireless resonance frequency transducer was bonded to the head of the mini-implants, and RFA values of the mini-implants in bone were detected and converted into implant stability quotient (ISQ) values by the RFA monitor.

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Jul
2009

When treating pronounced dentoalveolar compensation of a skeletal Class III malocclusion, preoperative decompensation frequently requires the extraction of maxillary lateral teeth and retraction of the incisors. In this context, maximum anchorage of the maxillary molars is frequently necessary to attain the significant increase in negative overjet that is desired. The aim of this study was to compare the quality of conventional and skeletal molar anchorage using mini-implants in association with pre-operative decompensation.

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Jul
2009

The aim of this study was to compare two types of orthodontic mini-implants, self-tapping and self-drilling, by measurement of the insertion torques and the displacements under lateral loading in an animal model.
After predrilling of host sites, 27 self-tapping and 27 self-drilling mini-implants were inserted in vitro in the ilia of country pigs. The axial drilling forces at each host site and the insertion torques during placement were recorded, and the displacements applied by variable lateral force (1 to 9 N) were measured.

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Jul
2009

To test the hypothesis that the impact of the insertion depth and predrilling diameter have no effect on the primary stability of mini-implants.
Twelve ilium bone segments of pigs were embedded in resin. After implant site preparation with different predrilling diameters (1.

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May
2009

In the course of a clinical pilot study we tested the vertical periodontal ligament (V-PDL) distraction as a means of aligning ankylosed upper canines. The objective of this study was to analyze the appropriateness und effectiveness of this method.
The ankylosed upper canines of five female patients aged between 16 und 19 years were surgically exposed, luxated, and after a latency period of 5 to 7 days, distracted at a rate of 0.

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Oct
2008


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Nov
2008

To analyze the impact of the insertion angle on the primary stability of mini-implants.
A total of 28 ilium bone segments of pigs were embedded in resin. Two different mini-implant sizes (Dual-Top Screw 1.

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Jan
2008

The use of mini-implants for skeletal anchorage has greatly broadened the therapeutic spectrum in orthodontics over the last few years. The alveolar ridge is the most frequent insertion site, which however is associated with tooth injury, a risk not to be underestimated. The objective of this study was to examine the quantitative parameters of pre-drilling and implant insertion in association with the degree of a root contact.

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Jan
2008

Skeletal anchorage with mini-implants has greatly broadened the treatment possibilities in orthodontics over the last few years. To reduce implant failure rates, it is advisable to obtain adequate primary stability. The aim of this study was to quantitatively analyze the impact of implant design and dimension on primary stability.

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