1,721,147 research outputs found
Nasopharyngeal carcinoma mimicking a temporomandibular disorder: A case report (vol 20, pg 101, 2006)
No full textSensory and motor changes of the human jaw muscles during induced orthodontic pain
No full textThe aim of this study was to evaluate the short-term effects of orthodontic pain on the pressure pain threshold (PPT) of the masseter and anterior temporalis muscles, and on their electromyographic (EMG) activity during clenching and chewing. Orthodontic pain was induced in 14 healthy subjects (mean age 26.6, SEM 1.1) by placing orthodontic separators. The subjects were randomly assigned to an experimental and to a control session in a double-blind crossover study. PPT was significantly reduced (Student's t-test; P 0.05). EMG activity during clenching and chewing was significantly reduced (0.001 less than or equal to P 0.05). The decrease of PPT found in this study can be related to the occurrence of muscle pain and headache reported by patients during orthodontic or other dental treatment. The decrease of EMG activity of the jaw muscles associated with orthodontic pain is consistent with the pain adaptation model and should be considered as a potential factor for loss of occlusal anchorage during orthodontic treatment
Evaluation of mandibular growth using cone-beam computed tomography in a rabbit model: a pilot study.
No full textOBJECTIVES:
The aim of this pilot study was to describe three-dimensional (3D) changes during mandibular growth in a rabbit model using cone-beam computed tomography (CBCT).
MATERIALS AND METHODS:
CBCT scans were taken of three growing New Zealand white rabbits at baseline and then fortnightly for eight weeks. Metallic tantalum 1-mm spheres were implanted as bone reference markers. 3D images were constructed, and mandibular growth was described by six measurements.
RESULTS:
The animals coped well with the experimental procedures. The use of CBCT to evaluate 3D mandibular growth appeared feasible in this rabbit model. Consistent mandibular growth (of 0.6 to 5.7 mm) was observed in all rabbits. Distances between the bone markers changed slightly (0.0 to 1.6 mm).
CONCLUSION:
During the observation period, vertical ramus growth in the rabbit mandible was more prominent than either sagittal or transverse growth. The mandibular molar region seemed to be the most stable area for radiographic superimposition in the rabbit model. 3D evaluation of mandibular growth in a rabbit model using CBCT represents a promising approach for the preclinical evaluation of proposed treatment intervention studies
Late facial growth and continuous dentoalveolar eruption: Implications for optimal dental implant placement
No full textAfter somatic growth ceases, craniofacial remodeling continues throughout adult-
hood, and teeth maintain a slow but persistent tendency to erupt. These ongoing
skeletal and dental changes contribute to the progressive infraocclusion of dental
implants. Our aim was to critically evaluate the evidence on late facial growth and
continuous dentoalveolar eruption, and their implications for timing, risk assessment,
and management of dental implants. A critical review of the current literature was
conducted, focusing on longitudinal studies, clinical trials, and systematic reviews
addressing residual facial bone remodeling, dentoalveolar eruption, and implant in-
fraocclusion. Particular attention was given to patient- specific factors and patient-reported
outcomes. Late craniofacial growth and continuous eruption of natural teeth
contribute to spatial discrepancies between implants and adjacent dentition, even in
skeletally mature adults. Younger age, increased anterior facial height, hyperdivergent
facial patterns, and high smile lines were identified as key risk factors for implant in-
fraocclusion. While delaying implant placement may reduce the risk of infraocclusion,
there is no clear age threshold beyond which implants are entirely stable. Certain
surgical techniques and prosthetic designs may mitigate long- term infraocclusion, and
alternative treatments such as orthodontic space closure or adhesive bridges may
provide a viable solution in selected cases. Progressive infraocclusion of implants is
a multifactorial phenomenon influenced by residual craniofacial growth and alveo-
lar changes. A thorough understanding of these biological processes and associated
risk factors is essential to guide clinicians in selecting the optimal timing for implant
placement and in considering alternative treatment strategies when appropriate. An
evidence- based, patient- centered approach can help improve long- term functional
and aesthetic outcomes, as well as patient satisfaction
Effect of prior knowledge about treatment on cephalometric measurements
Full text linkObjective: We hypothesised that prior knowledge of details for a growth modification treatment influences cephalometric measurements and results in a detectable bias. Design: Observational study. Setting: University teaching facility. Methods: Six orthodontic residents assessed 48 lateral cephalograms taken before and after functional appliance treatment from 24 patients. The residents assessed six cephalometric measurements, (Cd-Pog, Cd-Me, Ar-Pog, Ar-Me, Go-Me, SNB) over three separate sessions, in either a random concealed order or as matched pairs with information about treatment and time disclosed. Results: When information was disclosed, five out of the six cephalometric measurements were significantly higher that the corresponding cephalometric measurements taken randomly with undisclosed information. The bias was in the range of 1.6-3.2 mm for linear measurements and was 1.1° for SNB. Conclusion: Disclosing treatment information does introduce systematic errors in cephalometric measurements. Cephalometric analysis in orthodontic clinical research should be carried out by assessors who are blinded to treatment details, to minimise risk of bias
Fingers in mouths: from cause to management.
No full textDigit sucking is a habit that occurs in childhood and can lead to malocclusion if it persists for a long time. Understanding the cause and available management approaches for habit cessation can lead to more positive outcomes for clinicians, parents and children alike. Increasing clinicians' awareness of the causes and management of digit sucking behaviours can aid in their effective and systematic management, thereby reducing the risk of future malocclusion in some individuals
Psychological aspects of orthodontics in clinical practice. Part two: general psychosocial wellbeing.
No full textOrthodontists tend to treat/see their patients on a systematic, recurrent basis, often during crucial stages of psychological development. Therefore, they have a pivotal role in identifying a number of psychological as well as of psychiatric disorders. Effective communication is crucial and unfortunately, it is often underestimated in a busy clinical practice. Aim of part two of this article it to review the role clinical orthodontics and the orthodontist-patient relationship have on the patients' psychosocial wellbeing, including effects on self-esteem, bullying and harassment by peers, and even several psychiatric disorders, such as anorexia/bulimia nervosa, and attention deficit hyperactivity disorders. Due to the complexity and importance of these issues, the orthodontist may play a dynamic role, not only in the management of dental malocclusions, but at times, as "psychologist" and a counselor to the patient
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