Retrospective Radiographic Analysis and Treatment Outcomes of Patients With Congenitally Missing Maxillary Lateral Incisors.

Replacing congenitally missing teeth can be challenging due to anatomical limitations. This retrospective radiographic study aimed to evaluate (1) the dimensions of the alveolar ridge in congenitally missing maxillary lateral incisor sites and (2) whether straightforward implant placement and placement in a prosthetically ideal position was possible. CBCT images of the maxillary alveolar ridge were measured at 3, 8, and 13 mm from the planned crown margin in a labio-palatal and mesio-distal dimension.

Assessment of cone-beam CT technical image quality indicators and radiation dose for optimal STL model used in visual surgical planning.

Objectives: The aim of this study was to identify cone-beam computed tomography (CBCT) protocols that offer an optimal balance between effective dose (ED) and 3D model for orthognathic virtual surgery planning, using CT as a reference, and to assess whether such protocols can be defined based on technical image quality metrics.

Methods: Eleven CBCT (VISO G7, Planmeca Oy, Helsinki, Finland) scan protocols were selected out of 32 candidate protocols, based on ED and technical image quality measurements. Next, an anthropomorphic RANDO SK150 phantom was scanned using these 11 CBCT protocols and 2 CT scanners for bone quantity assessments.

Dental findings frequently overlooked in sinus computed tomography reports.

Objectives: Computed tomography (CT) and cone beam computed tomography (CBCT) represent the main imaging modalities used in rhinosinusitis patients and are also important in odontogenic sinusitis (OS) diagnostics. Reports, however, often lack information on dentition. Here, we aimed to determine how maxillary dentition is initially interpreted in rhinosinusitis patients' CT/CBCT reports and which dental findings in particular are potentially missed, thus needing more attention.

Dental health in patients with and without HPV-positive oropharyngeal and tongue cancer.

Background: Human papilloma virus is associated with oral and oropharyngeal cancer. Our aim was to examine oral health in patients with oropharyngeal (OPSCC) and oral tongue cancer (OTSCC), expecting better oral health among OPSCC patients.

Material And Methods: Fifty-five OPSCC patients with known HPV status and 59 OTSCC patients were randomly selected from a list of consecutive patients of the Helsinki University Hospital, Finland.

Surgical Treatment of Cherubism With the Use of ThreeDimensional Virtual Planning and CAD-CAM Resection Guides: A Case Report and Systematic Literature Review.

We report the use of a three-dimensional virtual surgical planning technique including both fusion and superimposition to obtain harmony and symmetry of the face in an 18-year-old woman suffering from cherubism. The treatment contained several threedimensional techniques that allowed precise planning and a predictable surgical outcome. The reduction plasty was successful, and the postoperative healing was uneventful.

Virtual Surgical Planning Combined With Intraoperative Navigation in Mandibular Bilateral Sagittal Split Osteotomy for Accurate Placement of Patient Specific Implants.

The aim of the study is to evaluate clinical methods to obtain a significantly improved fitting of patient specific implants (PSI) in bilateral sagittal split osteotomies and to evaluate the use of electromagnetic navigation as a potential guide for condyle positioning. A prospective study using (1) a solid bite registration index during preoperative computed tomography, (2) critical planning with regard to the condylar rotation, (3) a piezoelectric saw throughout the mandibular osteotomy, and (4) intraoperative navigation to determine the position of the PSIs and the mandibular segments intraoperatively was performed. Ten patients were treated.

Odontogenic causes complicating the chronic rhinosinusitis diagnosis.

Objectives: Chronic rhinosinusitis (CRS) frequently stems from a dental origin, although odontogenic sinusitis (OS) remains underdiagnosed amongst different professionals. This study aimed to explore how often odontogenic causes are considered when diagnosing CRS.

Materials And Methods: Patient records from 374 new CRS patients treated at a tertiary-level ear, nose, and throat (ENT) clinic were selected.

Activity of rheumatoid arthritis correlates with oral inflammatory burden.

To study oral health in patients with rheumatoid arthritis (RA) with emphasis on disease activity and treatment of RA. In this prospective cohort study 81 RA patients [53 early untreated RA (EURA) and 28 chronic RA (CRA) patients with inadequate response to synthetic disease modifying antirheumatic drugs (DMARDs)], underwent rheumatological [Disease Activity Score (28-joint) DAS28] and dental examinations [Total Dental Index (TDI), Decayed Missing Filled Teeth (DMFT) and Decayed Missing Filled Surfaces (DMFS)]. For controls, 43 volunteers were examined.

Did malpractice claims for failed dental implants decrease after introduction of CBCT in Finland?

Objectives: To examine the role of cone beam computed tomography (CBCT) in preventing failures in implant treatment. We hypothesize that the number of malpractice claims related to dental implant treatment would decrease after the first CBCT device came available in 2002 in Finland.

Material And Methods: Data concerning malpractice claims related to dental implant treatment during the years 1997-2011 were collected from the Finnish Patient Insurance Centre (N = 330 subjects).

Craniofacial and Dental Features in Six Children With Cherubism.

Cherubism is an autosomal-dominant benign bone disorder, characterized by fibro-osseous lesions in the mandible and maxilla commonly caused by mutations in the SH3-binding protein 2-gene. The purpose of the authors' study was to analyze craniofacial and dental features of children diagnosed with cherubism, describe their treatment, and assess their dental age compared with norms for Finnish children. Six children were diagnosed, followed up and treated due to dental and skeletal disorders caused by cherubsim.

Rapid prototyped patient specific guiding implants in critical mandibular reconstruction.

Large tumours of the mandible need immediate reconstruction to provide continuity of the mandible, satisfactory function of the jaw, as well as an acceptable aesthetic outcome. In this prospective study we described the immediate reconstruction of the mandible using computer aided design and 15 rapid prototyped patient specific implants (PSI) in 14 patients suffering from benign or malignant tumours demanding continuity resection of the mandible. The scaffold PSI was filled with β-tricalcium phosphate granules and autologous bone.

CT of facial fracture fixation: an experimental study of artefact reducing methods.

Objectives: This study aimed to determine the optimal post-operative CT imaging method that enables best visualization of facial bony structures in the vicinity of osteosynthesis material.

Methods: Conducted at Töölö Hospital (Helsinki, Finland), this study relied on scanning a phantom with CBCT, 64-slice CT and high-definition multislice CT with dual-energy scan (providing monochromatic images of 70-, 100-, 120- and 140-keV energy levels) and iterative reconstruction (IR) methods. Two radiologists assessed the image quality, and the assessments were analyzed.

Malpractice claims related to tooth extractions.

Objective: The aim of this study was to analyze malpractice claims related to tooth extractions in order to identify areas requiring emphasis and eventually to reduce the number of complications.

Material And Methods: We compiled a file of all malpractice claims related to tooth extractions (EBA code) between 1997 and 2010 from the Finnish Patient Insurance Centre. We then examined the data with respect to date, tooth, surgery, injury diagnosis, and the authority's decision on the case.

Ultrasonographic localization of the thyroid gland for its optimal shielding prior to lateral cephalometric radiography: a pilot study.

Objectives: Lateral cephalometric radiography is a common radiographic examination technique in children. The exclusion of the thyroid gland from the primary X-ray beam is important especially with children. However, patient treatment might require displaying the four most cranial cervical vertebrae (C1-C4) for the assessment of cervical vertebral maturation.

Rapid prototyping modelling in oral and maxillofacial surgery: A two year retrospective study.

Background: The use of rapid prototyping (RP) models in medicine to construct bony models is increasing.

Material And Methods: The aim of the study was to evaluate retrospectively the indication for the use of RP models in oral and maxillofacial surgery at Helsinki University Central Hospital during 2009-2010. Also, the used computed tomography (CT) examination - multislice CT (MSCT) or cone beam CT (CBCT) - method was evaluated.

Dental cone beam CT: A review.

For the maxillofacial region, there are various indications that cannot be interpreted from 2D images and will benefit from multiplanar viewing. Dental cone beam CT (CBCT) utilises a cone- or pyramid-shaped X-ray beam using mostly flat-panel detectors for 3D image reconstruction with high spatial resolution. The vast increase in availability and amount of these CBCT devices offers many clinical benefits, and their ongoing development has potential to bring various new clinical applications for medical imaging.

Dentomaxillofacial imaging with panoramic views and cone beam CT.

Panoramic and intraoral radiographs are the basic imaging modalities used in dentistry. Often they are the only imaging techniques required for delineation of dental anatomy or pathology. Panoramic radiography produces a single image of the maxilla, mandible, teeth, temporomandibular joints and maxillary sinuses.

Rapid prototyped patient specific implants for reconstruction of orbital wall defects.

Defects of orbital walls can be reconstructed using implants. The authors report a safe and accurate method to reconstruct bone defects in the orbital area using patient specific implants. A detailed process description of computer aided design (CAD) reconstructive surgery (CRS) is introduced in this prospective study.

Cone beam computed tomography in the assessment of alveolar bone grafting in children with unilateral cleft lip and palate.

Objectives: To quantify the treatment outcome of secondary alveolar bone grafting (SABG) in individuals with unilateral cleft lip and palate using cone beam computed tomography (CBCT) and to reveal needs for improvement in surgical technique.

Material And Methods: CBCT images taken 6 months after SABG of 35 patients were analysed. Vertical and horizontal bone supports of the grafted bone at three levels of the roots of the adjacent teeth were classified, the height of the nasal floor was compared with the unaffected side, and the inter- and intraexaminer reproducibility of these evaluations was assessed.

[Cone beam computed tomography and its clinical applications].

The rapid progress in imaging techniques has led to the introduction of new methods in many sections of radiology. While cone beam computed tomography is a fairly recent newcomer, it is a widely applied, precise three-dimensional method for imaging hard tissue structures especially in dental radiology. In addition to the precise imaging of hard tissue structures, its benefits include a smaller irradiation exposure than in conventional computed tomography, as well as lower price and, as a rule, smaller size of the equipment.

Availability of CBCT and iatrogenic alveolar nerve injuries.

Objective: To examine whether the rapid increase in the availability of cone-beam computed tomography (CBCT) has changed the number of inferior alveolar nerve (IAN) injuries related to the removal of mandibular third molars in Finland. The hypothesis was that the number of nerve injuries should diminish due to better imaging methods.

Materials And Methods: The number of CBCT devices, the annual number of CBCT examinations and the number of permanent IAN injuries occurring between 1997 and 2007 were analyzed.

Symptoms at presentation in children with sleep-related disorders.

Objective: To assess the link between sleep-disordered breathing and cognitive function in children. To identify correlations among polysomnography, upper respiratory infections, or cephalometric as well as rhinometric measures.

Methods: This study is based on a questionnaire survey of snoring in a population cohort of 2100 children.

Computerized tomography findings and recurrence of keratocystic odontogenic tumor of the mandible and maxillofacial region in a series of 46 patients.

Objectives: The aim of this study was to evaluate the computerized tomography (CT) features of keratocystic odontogenic tumors (KCOTs). Another aim was to determine the recurrence rate of KCOTs during a mean follow-up of 4.7 years.

Reliability of CBCT and other radiographic methods in preoperative evaluation of lower third molars.

Objectives: The aim of this study was to compare the reliability of cone-beam computerized tomography (CBCT) with that of other radiographic methods in preoperative radiographic determination of the number of roots of lower third molars and their relationship to the inferior alveolar canal (IAC).

Study Design: Forty-two teeth were clinically studied and imaged using CBCT and other imaging methods-panoramic radiography, multiprojection narrow-beam radiography (MNBR), and cross-sectional tomography. Statistical analysis (kappa values) was used to compare the diagnoses of 2 trained oral radiologists and the radiologic diagnoses with the findings at operation.

Multidetector row computed tomography of the injured larynx after trauma.

Laryngeal trauma is rare and can occur as an isolated injury or as part of multitrauma. On the basis of airway patency, it is decided whether the patient needs rapid surgical intervention or whether the patient would profit from preoperative imaging done with multidetector row multislice thin section computed tomography with multiplanar reconstruction in the soft-tissue and bone window setting. Grading the fracture pattern from minor isolated to multiple dislocated fracture lines helps to plan individual treatment options and to prevent long-term voice complications.