Publications by authors named "Nicholas Callahan"

Article Synopsis
  • Microvascular free flap reconstruction, while intended to restore function and aesthetics in head and neck surgery, often requires elective revisions to improve contour, symmetry, and support for dental needs.
  • The study aimed to determine the rate and risk factors for these elective revisions by analyzing data from 377 patients who underwent free flap surgeries from 2014 to 2021, following a cohort design.
  • Results indicated that demographic, medical history, and complications potentially influenced the necessity for revisions, with a significant portion of the sample requiring additional surgeries to enhance results.
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Article Synopsis
  • Patients treated with both antiresorptive medication and radiotherapy in the head and neck are at increased risk for developing complications such as jaw necrosis, fractures, and recurrence of conditions.
  • The study involved 17 patients who were compared to larger control groups, revealing significant differences in outcomes, with those receiving combined treatment facing higher risks.
  • The findings suggest that the combination of these treatments leads to a four-fold increase in recurrence risk and a higher likelihood of serious complications compared to patients receiving just one type of treatment.
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Dental implant therapy has developed over the past half century to have documented successful outcomes in most patients who receive treatment. The long-term survival of dental implants depends upon a variety of factors including patient, surgeon, restorative dentist, and materials-related factors. The impact of patient-associated factors may impact significantly on the success of dental implants including diabetes mellitus, medications, smoking, parafunctional habits, oral hygiene, head and neck radiation, and the use of bisphosphonates, antiangiogenic, and antiresorptive medications.

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Objective: Interfacility emergency department transfers (IETs) for maxillofacial trauma and infections are prevalent in the United States, with significant implications for health care costs. Limited availability of oral and maxillofacial surgeons (OMS) exacerbates unnecessary transfers and associated expenses. This study aimed to determine the incidence and costs of OMS IET.

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Oral squamous cell carcinoma (OSCC) biomarker studies rarely employ multi-omic biomarker strategies and pertinent clinicopathologic characteristics to predict mortality. In this study we determine for the first time a combined epigenetic, gene expression, and histology signature that differentiates between patients with different tobacco use history (heavy tobacco use with ≥10 pack years vs. no tobacco use).

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Odontogenic tumors represent a collection of entities ranging from hamartomas to destructive benign and malignant neoplasms. Occasionally, pathologists encounter gnathic lesions which clearly exhibit an odontogenic origin but do not fit within the confines of established diagnoses. Here, we describe two such odontogenic tumors, both affecting 3-year-old males.

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Purpose: Tumor margin status is critical in local tumor recurrence and is a significant prognostic factor in head and neck cancer survival. With the introduction of computer-assisted surgical planning, one of the main challenges is the accurate positioning of the surgical cutting guide but there is limited evidence of the accuracy of the 3D cutting guides in mimicking virtually planned osteotomy. This study evaluates the accuracy of osteotomy lines produced by 3D-printed cutting guides and assesses the overall accuracy of mandibular reconstruction.

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Statement Of Problem: Patients with vascularized bone flaps from the fibula have reduced bone height, in which case a higher prosthetic abutment is needed for their implant-supported prosthesis. Although the double-flap technique seems promising, systematic reviews and meta-analyses of prospective studies are lacking.

Purpose: The purpose of this systematic review and meta-analysis was to evaluate the grafted areas of single barrel fibular flaps (SBFF) and double-barrel fibular flaps (DBFF) by considering failure rates, dental implant complications, and bone union at the osteotomy sites.

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Background: Ablative mandibular resection with sacrifice of the inferior alveolar nerve (IAN) results in loss of sensation and decreased quality of life.

Purpose: The purpose of this study is to evaluate functional sensory recovery (FSR) of immediate IAN allograft reconstruction performed during ablative mandibular resection at 1 year following surgery.

Study Design, Setting, Sample: This is a single-center retrospective cohort study that included consecutive subjects who underwent mandibular resection with IAN discontinuity and used a nerve allograft of ≥40 mm.

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Background: Open reduction internal fixation (ORIF) of mandibular subcondylar fractures (MSF) involves several variables that could affect decision making. There is insufficient data regarding factors influencing the outcomes of MSF ORIF.

Purpose: The purpose of this study was to investigate factors associated with quality of bony reduction of MSF and occlusion, after ORIF.

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Numerous technologies are currently in development for use in next-generation protein sequencing platforms. A notable published approach employs fluorescently-tagged binding proteins to identity the N-terminus of immobilized peptides, in-between rounds of digestion. This approach makes use of N-terminal amino acid binder (NAAB) proteins, which would identify amino acids by chemical and shape complementarity.

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Background: Few studies have described a transmandibular approach for decompression in a patient with Klippel-Feil syndrome (KFS) for cervical myelopathy.

Objective: To describe the transmandibular approach in a KFS patient with cervical myelopathy and to perform a systematic review according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses.

Methods: A systematic review was performed using Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines.

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Odontogenic infections are preventable yet common in adults and children, and can progress to life-threatening levels if not definitively managed in a timely manner. Children with odontogenic infections often first present to the pediatric or general dental practice, making pediatric and general dentists key players in the management of odontogenic infections. While the pediatric or general dentist can definitively manage several types of infections, their critical role goes well beyond treatment to include timely and appropriate triage as well as facilitation of care when the severity of the infection exceeds the scope of their practice.

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Myositis ossificans Traumatica (MOT) is a non-neoplastic, heterotrophic ossifying disease process in muscle and soft tissue rarely involving the craniofacial area. Treatment depends on the extent of ossification and functional limitations. We present the first case of MOT of the temporalis muscle following neurosurgical intervention.

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Hypothesis And Objective: The oral and digestive tract microbial ecosystem has sparked interest because of its impact on various systemic diseases and conditions. The oral cavity serves not only as a reservoir for many potentially virulent microbiota but also as an important entry point and portal to the human body system. This is especially significant in the transmissibility of the virulent current pandemic virus SARS-CoV-2.

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Oral squamous cell carcinoma (OSCC) patients suffer from poor survival due to metastasis or locoregional recurrence, processes that are both facilitated by perineural invasion (PNI). OSCC has higher rates of PNI than other cancer subtypes, with PNI present in 80% of tumors. Despite the impact of PNI on oral cancer prognosis and pain, little is known about the genes that drive PNI, which in turn drive pain, invasion, and metastasis.

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Bottom-up proteomic experiments often require selective conjugation or labeling of the N- and/or C-termini of peptides resulting from proteolytic digestion. For example, techniques based on surface fluorescence imaging are emerging as a promising route to high-throughput protein sequencing but require the generation of peptide surface arrays immobilized through single C-terminal point attachment while leaving the N-terminus free. While several robust approaches are available for selective N-terminal conjugation, it has proven to be much more challenging to implement methods for selective labeling or conjugation of the C-termini that can discriminate between the C-terminal carboxyl group and other carboxyl groups on aspartate and glutamate residues.

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Background And Purpose: Treatment of oral squamous cell carcinoma (OSCC) is based on clinical exam, biopsy, and a precise imaging-based TNM-evaluation. A high sensitivity and specificity for magnetic resonance imaging (MRI) and F-18 FDG PET/CT are reported for N-staging. Nevertheless, staging of oral squamous cell carcinoma is most often based on computed tomography (CT) scans.

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