Incidence of condylar resorption after bimaxillary, Lefort I, and mandibular surgery: an overview

Abstract Background: This study was conducted to evaluate the accuracy of navigation process according to the type of tracking methods and registration markers. The target registration errors (TREs) were measured at seven anatomical landmarks of the mandible for evaluation. Methods: Four different experiments were performed to obtain the TREs using two different tracking methods, the optical tracker (Polaris) and the electromagnetic (EM) tracker (Aurora), and two different types of registration markers, invasive and noninvasive markers. All comparisons of TREs were statistically analyzed using SPSS and Python-based statistical package (Pingouin). Results: The average TRE values obtained from the four different experiments were as follows: 1) 0.85 mm using invasive marker and Aurora, 2) 1.06 mm using invasive marker and Polaris, 3) 1.43 mm using noninvasive marker and Aurora, and 4) 1.57 mm using noninvasive marker and Polaris. All comparisons among the type of markers and the seven anatomical landmarks revealed statistically significant differences, except for the type of tracking system. Although the comparison between the modality of the tracking system showed no significant differences, the EM-based approach consistently demonstrated better performances than the optical type in all comparisons. Conclusions: This study demonstrates that, irrespective of the tracking modality, the invasive marker is a better choice in terms of accuracy. When using the noninvasive marker, it is important to consider the increased TREs. In the present study, the noninvasive marker caused a maximum increment of TREs of approximately 0.81 mm compared with the invasive marker. Furthermore, EM-based tracking using an invasive marker may result in the best accuracy for the mandible.

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Pulpal and Periodontal Tissues Changes Associated with Le Fort I and Sagittal Split Ramus Osteotomies: A review

The Open Dentistry Journal ◽

10.2174/1874210601812010024 ◽

2018 ◽

Vol 12 (1) ◽

pp. 24-31 ◽

Cited By ~ 1

Author(s):

Konstantinos Lazaridis ◽

Maria Lazaridou ◽

Athanasios E. Athanasiou

Keyword(s):

Blood Flow ◽

Adverse Effects ◽

Initial Increase ◽

Sagittal Split Ramus Osteotomy ◽

Le Fort ◽

Periodontal Tissues ◽

Tooth Discoloration ◽

Maxillary Surgery ◽

Le Fort I ◽

Mandibular Surgery

Introduction: Le Fort I and sagittal split ramus osteotomies are the most commonly performed orthognathic surgery procedures on the maxilla and mandible, respectively. Techniques: Despite progress in the techniques, these procedures may still be associated with morbidity, expressed as inflammation, inadequate bony union, periodontal damages or in extreme cases even total bone loss. Discussion: Through a comprehensive review of the literature, the influences of maxillary and mandibular surgery on Pulpal Blood Flow (PBF), pulp sensitivity and pulp vitality are examined. Moreover, adverse effects of maxillary surgery on tooth color and periodontal tissues are also reported. The effects had a variety of expression. Concerning maxillary surgery, some studies showed an initial increase in PBF followed by a decrease to the baseline or even lower levels after 1-3 months. Other studies found an initial decrease in PBF followed by an increase soon after. There were also studies that showed no significant PBF changes, in contrast. Conclusion: Concerning mandibular surgery, a recent study showed a decrease in PBF immediately after sagittal split ramus osteotomy. Some authors detected tooth discoloration of maxillary teeth after Le Fort I osteotomy. Root resorption and root injury were also detected, but were of minor significance. Usually, these adverse effects derive from injury of the vessels of the palatal pedicle. This pedicle should be maintained intact for the avoidance of blood flow impairments. In addition, the descending palatine artery should be protected during maxillary surgery procedures in order to maintain the highest possible blood flow on the maxillary teeth.

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ELECTRICAL VESTIBULAR NERVE STIMULATION FOR THE MANAGEMENT OF TENSION HEADACHE

Asian Journal of Pharmaceutical and Clinical Research ◽

10.22159/ajpcr.2020.v13i1.35975 ◽

2019 ◽

pp. 1-3

Author(s):

SAI SAILESH KUMAR GOOTHY ◽

SRILATHA GOOTHY ◽

JASON MCKEOWN

Keyword(s):

Nerve Stimulation ◽

Tension Headache ◽

Pain Scale ◽

Vestibular Nerve ◽

Normal Limits ◽

Relieve Pain ◽

Single Person ◽

History Of ◽

Mandibular Surgery ◽

Stimulation Of

Tension headache is the most common type of headache and typically it is described as pain or pressure in the head, scalp, or neck, often associated with localized muscle discomfort. It was hypothesized that stimulation of vestibular nerve may relieve pain. In this single-person study, vestibular nerve stimulation was administered daily for a period of 6 weeks. The participant was an 18 years male with a 4 years history of moderate headache at least once week and with repeated periods of moderate stress. He was under medications; however, the pain was not relieved. Stress levels were measured using DASS 21 scale. Pain was measured using pain scale, autonomic, and cognitive parameters recorded by standard methods. During this study, the participant reported a significant reduction in both the frequency and intensity of headaches and by the end of the 6 weeks of the study, it was noticed that he reduced the usage of pain medication. Autonomic parameters remained within normal limits after the periods of stimulation and cognitive functions were improved. This study suggests that electrical stimulation of the vestibular nerve may help to reduce tension headache and highlights the need for larger studies in this area and further exploratory studies in the management of other regional pain such as orofacial pain, dental pain, and management of pain after mandibular surgery.

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