Publications by authors named "Joachim Anton Obwegeser"

Purpose: This study aimed to compare the reliability of three different imaging software programs for measuring the PAS and concurrently to investigate the morphological changes in oropharyngeal structures in mandibular prognathic patients before and after orthognathic surgery by using 2D and 3D analyzing technique.

Material And Methods: The study consists of 11 randomly chosen patients (8 females and 3 males) who underwent maxillomandibular treatment for correction of Class III anteroposterior mandibular prognathism at the University Hospital in Zurich. A set of standardized LCR and CBCT-scans were obtained from each subject preoperatively (T0), 3 months after surgery (T1) and 3 months to 2 years postoperatively (T2).

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Long-term anthropometric follow-up of cranial vault growth may considerably add valuable information to current literature focusing on treatment strategies for premature multiple-suture craniosynostosis. The aim of this paper was to compare postoperative growth patterns of nonsyndromic and syndromic multiple-suture craniosynostotic children with sex-matched and age-matched children from the typically developing population. Forty-one multiple-suture craniosynostotic patients (19 nonsyndromic and 22 syndromic) were included in this 5-year follow-up.

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Purpose: The use of three-dimensional (3D) photography for anthropometric measurements is of increasing interest, especially in the cranio-maxillofacial field. Before standard implementation, accurate determination of the precision and accuracy of each system is mandatory.

Methods: A mannequin head was labelled with 52 landmarks, and 28 three-dimensional images were taken using a commercially available five-pod 3D photosystem (3D VECTRA; Canfield, Fairfield, NJ) in different head positions.

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Purpose: This study analysed the aesthetic outcome assessments after trigonocephaly correction using different assessor groups.

Methods: Twenty-four patients (9 males, 15 females) with a surgical age between 8 and 10 months were included. Standardised photographs showing different facial views of the patients between ages 3 and 6 years were evaluated in terms of aesthetics by three study groups: surgeons, medical students, and lay persons.

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Various techniques for the correction of sagittal craniosynostosis have been described in the literature. Nevertheless, there is a lack of consensus regarding surgical procedure and timing, although a long-term anthropometric analysis may shed light on this controversy. The aim of the current study was to collect serial anthropometric data of children before and after total cranial vault remodeling and to evaluate cranial vault growth pattern.

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Fronto-orbital advancement (FOA) is the most common technique used to correct plagiocephaly and trigonocephaly. The aim of this study was to investigate the cranial vault growth following FOA and to compare the growth pattern to the normal standard. Fifty-two Swiss children (25 with anterior plagiocephaly and 27 with trigonocephaly) between the surgical ages of 8 and 10 months were included in this 5-year follow-up study.

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Segmental distraction osteogenesis of the anterior alveolar process is a sufficient method to enlarge the alveolar arch. Indications for this method are dental crowding, retroalveolism, and leveling of the curve of Spee. However, after the distraction period, the anterior alveolar segment often shows an unfavorable inclination resulting in nonphysiologic load on the lower incisors.

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Purpose: Anterior alveolar osteodistraction is a common method for enlargement of the dentoalveolar process, and bone-borne distraction devices are hypothesized to avoid the risk of dental tipping and periodontal impairment during distraction. The aim of this study was to objectify this thesis and to determine the reliability of bone-borne osteodistraction of the anterior alveolar process.

Patients And Methods: The study group consisted of 18 consecutive patients who underwent anterior alveolar segmental distraction with a bone-borne distraction device for the treatment of dental crowding or alveolar retrusion from 2008 through 2011.

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Questions Under Study: 8 years after discovery of osteonecrosis of the jaw associated with bisphosphonate therapy a lot of experience has been garnered in treating 112 patients with this disease. This disease, although uncommon, is still a burden for the patient as well as the treating specialists and an adequate standardised classification as well as therapy does not exist. This article presents a summary of collected patient data, garnered experience and consequential changes in knowledge, in diagnostic measures and therapy.

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Segmental distraction osteogenesis of the anterior mandibular alveolar process (frontblock) is a sufficient method to avoid extractions in patients with dental crowding and to decompensate retroalveolism. Up to now dental-borne devices were used, but limitate the indications for front-block distraction. A new bone-borne distraction device for mandibular alveolar front-block movement is introduced in this study.

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Purpose: Segmental distraction osteogenesis of the anterior alveolar process has been introduced as a technique designed to avoid extractions in patients with severe dental crowding. The aim of this study was to quantify the degree of dental tipping within the alveolar segment after distraction osteogenesis.

Patients And Methods: Patients treated for dental crowding, retruded anterior alveolar process, or flat curves of Spee using segmental distraction osteogenesis of the anterior alveolar process were included in the study.

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The closure of wide palatal clefts and recurrent oronasal fistulae may be challenging. After repeated failure of conventional techniques, microvascular tissue transfer may be indicated in the closure of such fistulae. Depending on the location and the size of the palatal fistula, different tissues are required to sufficiently close the palatal gaps.

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Background: Buried intraoral devices for distraction osteogenesis in mandibular deformities have numerous advantages, but success depends on the precise positioning of these devices. Although most centers nowadays use template-guided techniques for precise positioning, computer navigation has been described as a promising technique. Surgical navigation during device placement could become a viable method because it affords certainty in defining a device position.

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In the modern anthropometry of complex structures, such as the face, different technical approaches for acquisition of three-dimensional data have become increasingly more common. Results of meticulous evaluations have shown high degrees of precision and accuracy under both ideal and clinical circumstances. However, the question remains as to which level of accuracy is adequate to meet clinical needs.

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Background: Surgical navigation requires registration of the pre-operative image dataset with the patient in the operation theatre. Various marker and marker-free registration techniques are available, each bearing an individual level of precision and clinical practicability. In this study the precision of four different registration methods in a maxillofacial surgical setting is analyzed.

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