scholarly journals Applicability of a single camera-based catheter navigation system using teeth arch as an anatomical landmark for superselective intraarterial infusion in advanced oral cancer treatment

2021 ◽  
Vol 59 (3) ◽  
pp. 663-672
Author(s):  
Ken Yanagida ◽  
Takashi Ohya ◽  
Junchen Wang ◽  
Toshinori Iwai ◽  
Toshiharu Izumi ◽  
...  
Keyword(s):  
Oral Cancer ◽  
Carotid Artery ◽  
Tracking System ◽  
Anatomical Landmark ◽  
Single Camera ◽  
Intraarterial Infusion ◽  
Posterior Teeth ◽  
Anterior Teeth ◽  
The Difference ◽  
3D Information

AbstractSuperselective intraarterial infusion chemoradiotherapy is a modality of oral cancer therapy in which the artery feeding the tumor is catheterized. 3D information about the carotid artery is required to enable the surgeon to judge whether to advance, retract, or rotate the catheter. For this purpose, we proposed and conducted a model experiment to assess a new method of catheterization that applies a tracking system using registration with a monocular camera using the maxillary arch as the anatomical landmark. In this method, the preoperative 3D computer tomography angiographic image of the carotid artery that the catheter will be passed through is overlaid on the 2D video image. The mean TRE was 0.96 ± 0.36 mm and 0.88 ± 0.31 mm and 1.12 ± 0.46 mm when images were registered with the anterior and posterior teeth as the landmarks, respectively; the difference was not significant (p = 0.21). This tracking system that enables markerless registration simply by taking images of the maxillary anterior teeth with a single camera was convenient and effective for catheterization. In this study, we propose the new application of this tracking system and a novel method of catheterization for superselective intraarterial infusion chemoradiotherapy for oral cancer. Graphical abstract

An analysis of malpractice litigation in the surgical management of carotid artery disease

2020 ◽  
Vol 132 (6) ◽  
pp. 1900-1906 ◽  
Author(s):  
Jack J. Haslett ◽  
Lindsey A. LaBelle ◽  
Xiangnan Zhang ◽  
J Mocco ◽  
Joshua Bederson ◽  
...  
Keyword(s):  
Carotid Artery ◽  
Perioperative Care ◽  
Carotid Artery Disease ◽  
Significant Risk ◽  
Search Terms ◽  
Jury Verdicts ◽  
Procedural Error ◽  
Legal Databases ◽  
The Difference ◽  
Artery Disease

OBJECTIVECarotid artery disease is a common illness that can pose a significant risk if left untreated. Treatment via carotid endarterectomy (CEA) or carotid artery stenting (CAS) can also lead to complications. Given the risk of adverse events related to treating, or failing to treat, carotid artery disease, this is a possible area for litigation. The aim of this review is to provide an overview of the medicolegal factors involved in treating patients suffering carotid artery disease and to compare litigation related to CEA and CAS.METHODSThree large legal databases were used to search for jury verdicts and settlements in cases related to untreated carotid artery disease, CEA, and CAS. Search terms included “endarterectomy,” “medical malpractice,” “carotid,” “stenosis,” “stenting,” “stent,” and combinations of those words. Three types of cases were considered relevant: 1) cases in which the primary allegation was negligence performing a CEA or perioperative care (CEA-related cases); 2) cases in which the primary allegation was negligence performing a CAS or perioperative care (CAS-related cases); and 3) cases in which the plaintiff alleged that a CEA or CAS should have been performed (failure-to-treat [FTT] cases).RESULTSOne hundred fifty-four CEA-related cases, 3 CAS-related cases, and 67 FTT cases were identified. Cases resulted in 133 verdicts for the defense (59%), 64 settlements (29%), and 27 plaintiff verdicts (12%). The average payout in cases that were settled outside of court was $1,097,430 and the average payout in cases that went to trial and resulted in a plaintiff verdict was $2,438,253. Common allegations included a failure to diagnose and treat carotid artery disease in a timely manner, treating with inappropriate indications, procedural error, negligent postprocedural management, and lack of informed consent. Allegations of a failure to timely treat known carotid artery disease were likely to lead to a payout (60% of cases involved a payout). Allegations of procedural error, specifically where the resultant injury was nerve injury, were relatively less likely to lead to a payout (28% of cases involved a payout).CONCLUSIONSBoth diagnosing and treating carotid artery disease has serious medicolegal implications and risks. In cases resulting in a plaintiff verdict, the payouts were significantly higher than cases resolved outside the courtroom. Knowledge of common allegations in diagnosing and treating carotid artery disease as well as performing CEA and CAS may benefit neurosurgeons. The lack of CAS-related litigation suggests these procedures may entail a lower risk of litigation compared to CEA, even accounting for the difference in the frequency of both procedures.

scholarly journals Comparison of the accuracy of intraoral scans between complete-arch scan and quadrant scan

2020 ◽  
Vol 21 (1) ◽  
Author(s):  
Youn-Gyeong Moon ◽  
Kyung-Min Lee
Keyword(s):  
Third Molar ◽  
Careful Consideration ◽  
Missing Teeth ◽  
Posterior Teeth ◽  
Anterior Teeth ◽  
Posterior Quadrant ◽  
Left Posterior ◽  
The Right ◽  
Best Fit ◽  
Posterior Area

Abstract Objective To compare the accuracy of complete-arch scans and quadrant scans obtained using a direct chairside intraoral scanner. Material and methods Intraoral scans were obtained from 20 adults without missing teeth except for the third molar. Maxillary and mandibular complete-arch scans were carried out, and 4 quadrant scans for each arch were performed to obtain right posterior, right anterior, left anterior, and left posterior quadrant scans. Complete-arch scans and quadrant scans were compared with corresponding model scans using best-fit surface-based registration. Shell/shell deviations were computed for complete-arch scans and quadrant scans and compared between the complete-arch scans and each quadrant scans. In addition, shell/shell deviations were calculated also for each individual tooth in complete-arch scans to evaluate factors which influence the accuracy of intraoral scans. Results Complete-arch scans showed relatively greater errors (0.09 ~ 0.10 mm) when compared to quadrant scans (0.05 ~ 0.06 mm). The errors were greater in the maxillary scans than in the mandibular scans. The evaluation of errors for each tooth showed that the errors were greater in posterior teeth than in anterior teeth. Comparing the right and left errors, the right side posterior teeth showed a more substantial variance than the left side in the mandibular scans. Conclusion The scanning accuracy has a difference between complete-arch scanning and quadrant scanning, particularly in the posterior teeth. Careful consideration is needed to avoid scanning inaccuracy for maxillary or mandibular complete-arch, particularly in the posterior area because a complete-arch scan might have potential error than a quadrant scan.

scholarly journals Dual-section versus conventional archwire for en-masse retraction of anterior teeth with direct skeletal anchorage: a finite element analysis

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Ryo Hamanaka ◽  
Daniele Cantarella ◽  
Luca Lombardo ◽  
Lorena Karanxha ◽  
Massimo Del Fabbro ◽  
...  
Keyword(s):  
Finite Element ◽  
Tooth Movement ◽  
Occlusal Plane ◽  
Skeletal Anchorage ◽  
Element Analysis ◽  
Posterior Teeth ◽  
Posterior Portion ◽  
Anterior Teeth ◽  
Retraction Force ◽  
En Masse Retraction

Abstract Background The aim of this study is to compare the biomechanical effects of the conventional 0.019 × 0.025-in stainless steel archwire with the dual-section archwire when en-masse retraction is performed with sliding mechanics and skeletal anchorage. Methods Models of maxillary dentition equipped with the 0.019 × 0.025-in archwire and the dual-section archwire, whose anterior portion is 0.021 × 0.025-in and posterior portion is 0.018 × 0.025-in were constructed. Then, long-term tooth movement during en-masse retraction was simulated using the finite element method. Power arms of 8, 10, 12 and 14 mm length were employed to control anterior torque, and retraction forces of 2 N were applied with a direct skeletal anchorage. Results For achieving bodily movement of the incisors, power arms longer than 14 mm were required for the 0.019 × 0.025-in archwire, while between 8 and 10 mm for the dual-section archwire. The longer the power arms, the greater the counter-clockwise rotation of the occlusal plane was produced. Frictional resistance generated between the archwire and brackets and tubes on the posterior teeth was smaller than 5% of the retraction force of 2 N. Conclusions The use of dual-section archwire might bring some biomechanical advantages as it allows to apply retraction force at a considerable lower height, and with a reduced occlusal plane rotation, compared to the conventional archwire. Clinical studies are needed to confirm the present results.

Full-Mouth Rehabilitation for a Patient With Dentinogenesis Imperfecta: A Clinical Report

2014 ◽  
Vol 40 (5) ◽  
pp. 593-600 ◽  
Author(s):  
Sompop Bencharit ◽  
Michael B. Border ◽  
C. Russell Mack ◽  
Warren C. Byrd ◽  
John T. Wright
Keyword(s):  
Dental Implants ◽  
Computer Aided Design ◽  
Genetic Disorder ◽  
Asian Woman ◽  
Clinical Report ◽  
Dentinogenesis Imperfecta ◽  
Posterior Teeth ◽  
Anterior Teeth ◽  
Computer Aided ◽  
Full Mouth Rehabilitation

Dentinogenesis imperfecta (DI) is a genetic disorder affecting the structural integrity of the dentin that can result in weakened dentin. The affected teeth, especially posterior teeth, often need to be extracted due to severe wear or fracture. This frequently yields a loss of posterior occlusion and occlusal vertical dimension. Besides wear and fracture, anterior teeth often have an unesthetic appearance because of discoloration. Current treatments of choice, including composite bonding restorations and, more recently, all-ceramic restorations, are typically suggested to preserve the remaining teeth and tooth structure. However, there are a limited number of studies on dental implants in patients with DI. The effectiveness of dentin bonding and dental implants in patients with DI is not known. This clinical report describes a 32-year-old Asian woman with DI who underwent full-mouth rehabilitation. The posterior occlusion, mostly in the molar areas, was restored with dental implants and ceramometal restorations. The anterior teeth and premolars were restored with bonded lithium disilicate glass-ceramic pressed veneers and crowns made with computer-aided design/computer-aided manufacturing. This case demonstrates that restoring functional occlusion and esthetics for a patient with DI can be completed successfully using contemporary implant therapy and adhesive dentistry.

scholarly journals Correlation between Innercanthal Distance and Mesiodistal Width of Maxillary Anterior Teeth in a Thrissur, Kerala, India, Population

2016 ◽  
Vol 17 (5) ◽  
pp. 382-387 ◽  
Author(s):  
Kamalakanth Shenoy ◽  
George Attokaran
Keyword(s):  
Statistical Significance ◽  
Age Group ◽  
Dynamic Changes ◽  
Anterior Teeth ◽  
High Statistical Significance ◽  
Treatment Plans ◽  
Facial Proportions ◽  
Males And Females ◽  
The Difference ◽  
Changes Over Time

ABSTRACT Background Selecting and replacing missing teeth to natural proportions and esthetic preference of a patient in the absence of pre-extraction records is a very challenging task. Although facial analysis and proportions are well discussed in many populations, none exists for the Thrissur, Kerala, population. A prosthodontic rehabilitation for Kerala patients relying on other racial norms may result in dissonant facial proportions. Therefore, the purpose of this study was (1) to evaluate the validity of innercanthal distance as a guide in determining the mesiodistal dimension of six maxillary anterior teeth in a selected Malayalee population in the Thrissur Municipal Corporation area; (2) to check whether innercanthal distance undergoes dynamic changes over time as a result of aging; and (3) to evaluate whether there is a gender difference in the analyzed mean facial and dental proportions in this population. Materials and methods The study was conducted on 1,200 subjects in the Thrissur Municipal Corporation area. From five wards, 240 subjects were selected, out of which 120 were from the 18 to 25 years age group and 120 from the 40 to 50 years age group. Sixty males and females were selected from each group. The innercanthal distance was measured using a Digital Vernier Caliper, and alginate impressions were made to evaluate the size of maxillary anteriors. The data was analyzed statistically. Results The study showed that there is a high statistical significance between the innercanthal distance and the mesiodistal width of six maxillary anterior teeth in females (p < 0.01) and no significance in males. There was also dynamic changes in the innercanthal dimension and the mesiodistal width of maxillary anteriors with increase in age (p < 0.001). The difference in the mean of innercanthal distance between the genders was highly statistically significant, but no significance was found between the genders in the mesiodistal width of maxillary anteriors. Conclusion Within the population evaluated, there was a high statistical significance in females between the innercanthal distance and the mesiodistal width of six maxillary anterior teeth, but not for males. Innercanthal dimension was found to undergo dynamic changes as age increases in both males and females, and it was much higher in males than in females. There was no statistical significance in the comparative evaluation of mesiodistal width of maxillary anteriors of males and females in the study. Clinical significance Teeth selection is a critical step in determining the outcome of successful prosthodontic treatment. No definite guidelines for the selection of maxillary anterior teeth pertaining to the Thrissur, Kerala, population exist. A prosthodontic rehabilitation of Thrissur, Kerala, patients relying on other racial norms will result in dissonant facial proportions. In selecting maxillary anterior teeth, the knowledge of racial norms will help specify certain esthetic and functional modifications in treatment plans, which might be specific to each group. Therefore, there remains an unquestionable need for a scientific and reliable method for maxillary anterior teeth selection, which can be applied on this group of Indian population. How to cite this article Attokaran G, Shenoy K. Correlation between Innercanthal Distance and Mesiodistal Width of Maxillary Anterior Teeth in a Thrissur, Kerala, India, Population. J Contemp Dent Pract 2016;17(5):382-387.

scholarly journals Do NiTi Instruments show Defects before Separation? Defects caused by Torsional Fatigue in Hand and Rotary Nickel-Titanium (NiTi) Instruments which Lead to Failure during Clinical Use

2012 ◽  
Vol 13 (6) ◽  
pp. 867-872 ◽  
Author(s):  
Sudhir Kumar ◽  
P Ratnakar ◽  
NV Murali Krishna Chakka ◽  
Sanjib Das ◽  
Anandamy Bagchi ◽  
...  
Keyword(s):  
Nickel Titanium ◽  
Clinical Use ◽  
New Classification ◽  
Torsional Fatigue ◽  
Anterior Teeth ◽  
Microscopic Evaluation ◽  
Different Types ◽  
Before And After ◽  
The Difference ◽  
Niti Instruments

ABSTRACT Aims Visual and microscopic evaluation of defects caused by torsional fatigue in hand and rotary nickel titanium (NiTi) instruments. Materials and methods Ninety-six NiTi greater taper instruments which were routinely used for root canal treatment only in anterior teeth were selected for the study. The files taken include ProTaper for hand use, ProTaper Rotary files and Endowave rotary files. After every use, the files were observed visually and microscopically (Stereomicroscope at 10×) to evaluate the defects caused by torsional fatigue. Scoring was given according to a new classification formulated which gives an indication of the severity of the defect or damage. Statistical analysis Data was statistically analyzed using KruskallWallis and Mann-Whitney U test. Results Number of files showing defects were more under stereomicroscope than visual examination. But, the difference in the evaluation methods was not statistically significant. The different types of defects observed were bent instrument, straightening/stretching of twist contour and partial reverse twisting. Endowave files showed maximum number of defects followed by ProTaper for hand use and least in ProTaper Rotary. Conclusion Visible defects due to torsional fatigue do occur in NiTi instruments after clinical use. Both visual and microscopic examinations were efficient in detecting defects caused due to torsional fatigue. This study emphasizes that all files should be observed for any visible defects before and after every instrumentation cycle to minimize the risk of instrument separation and failure of endodontic therapy. How to cite this article Chakka NVMK, Ratnakar P, Das S, Bagchi A, Kumar S, Anumula L. Do NiTi Instruments show Defects before Separation? Defects caused by Torsional Fatigue in Hand and Rotary Nickel-Titanium (NiTi) Instruments which Lead to Failure during Clinical Use. J Contemp Dent Pract 2012;13(6):867-872.

scholarly journals The quality of etched enamel in different regions and tooth types and its significance in bonding and the development of white spot lesions

2021 ◽  
Author(s):  
Elisabeth C. Barnhart ◽  
Phillip M. Campbell ◽  
Amal Noureldin ◽  
Katie Julien ◽  
Peter H. Buschang
Keyword(s):  
White Spot ◽  
Cervical Region ◽  
White Spot Lesions ◽  
Micro Computed Tomography ◽  
Human Teeth ◽  
Posterior Teeth ◽  
Material Density ◽  
Anterior Teeth ◽  
Before And After

ABSTRACT Objectives To quantify differences in the etch quality of enamel within and between human teeth, which has not previously been attempted. Materials and Methods The buccal right and left halves of 27 extracted human teeth were randomly allocated to scanning electron microscopy (SEM) or micro–computed tomography (μCT) for evaluation. The buccal surfaces were pumiced, etched with 37% phosphoric acid gel etchant for 15 seconds, rinsed, and air dried. Each tooth was divided into three regions (incisal, middle, and cervical) and viewed after etching at 1200× magnification with SEM. The μCT scans were taken before and after etching to calculate apparent and material mineral densities. Results SEM showed greater aprismatic enamel and poorer etch quality (ie, significantly less percentage enamel) for the posterior than anterior teeth and for the cervical region than for the incisal and middle regions of all teeth. Although there were no density differences prior to etching, μCT demonstrated that etching increased material density significantly more for the anterior than posterior teeth. Prior to etching, the enamel in the cervical regions was significantly less dense than the enamel in the middle or incisal regions. Etching significantly increased the material density of all three regions, which decreased initial regional differences. After etching, the apparent density of the cervical region remained significantly lower than the densities of the other two regions. Conclusions Based on SEM and μCT, there is greater aprismatic enamel and inferior etch quality in the cervical regions of all tooth types and is clinically significant in explaining the failure of sealant retention and the propensity for white spot lesions.

scholarly journals Effectiveness of the Greater Palatine Nerve Block for Anaesthetising Anterior Palate: A Prospective Study

2020 ◽  
Author(s):  
Gopinath Thilak Parepady Sundar ◽  
Tripthi Prakash Shetty ◽  
Bhanuprakash Bylapudi ◽  
Vikram Shetty ◽  
Chrysl Castellino ◽  
...  
Keyword(s):  
Prospective Study ◽  
Nerve Block ◽  
Anterior Region ◽  
Infraorbital Nerve ◽  
Outcome Variable ◽  
Posterior Teeth ◽  
Similar Action ◽  
Anterior Teeth ◽  
Greater Palatine Nerve ◽  
Palatal Mucosa

Introduction: Local Anaesthesia (LA) is the mainstay of any routine dental extraction. Accomplishing optimum anaesthesia with least pain and anxiety to patients is a challenge. Hence, modification of technique and application of routine dental LA to enhance patient comfort is the need of the hour. In this pursuit, a prospective cohort study was carried out to evaluate the effectiveness of greater palatine nerve block as an alternative to nasopalatine nerve block in anaesthetising the anterior palatal mucosa and to achieve optimum palatal anaesthesia. Aim: The primary outcome variable is to assess the extent of the anaesthetic effect of greater palatine nerve block in maxillary anterior palatal region. Materials and Methods: A total of 100 patients scheduled for the extraction of ipsilateral anterior and posterior maxillary teeth were included in this prospective study between June 2017 to June 2019. Palatal anaesthesia for all the extractions done was achieved only with greater palatine nerve block. After an interval of five minutes, the extent of palatal anaesthesia from the posterior palatal tissue to the anterior region was evaluated for both subjective and objective symptoms. Pain on the palatal mucosa was assessed using Numerical rating scale of 0-10. Post-evaluation, depending on the proposed tooth of extraction, buccal anaesthesia was achieved with Posterior superior alveolar nerve block for posterior teeth and infraorbital nerve block for anterior teeth. Results: Of the 100 patients administered with greater palatine nerve block, it was observed that in 36 patients (36%) had effectiveness in anaesthesia till central incisor, 28 (28%) patients had effectiveness in anaesthesia till lateral incisor, 20 (20%) patients had effective in anaesthesia till the canine and 16 (16%) patients anaesthetic effects were limited to posterior teeth. Overall, 84% had varied degree of positive anterior anaesthesia with greater palatine nerve block alone. Conclusion: Greater palatine nerve block was effective in providing anaesthesia to the posterior region till the premolars, with the extended complete anaesthesia in the anterior region with similar action as the nasopalatine nerve block administered to anaesthetise the anterior palate for extraction of the anterior teeth.

scholarly journals Case Report. Prosthetic Rehabilitation of Crowded Maxillary Anterior Teeth

2017 ◽  
Vol 2 (s1) ◽  
pp. 64-67
Author(s):  
Emese Rita Markovics ◽  
Kinga Dörner ◽  
Orsolya Birta ◽  
Julia Popa
Keyword(s):  
Case Report ◽  
Plaster Cast ◽  
Point Of View ◽  
Case Presentation ◽  
Golden Proportion ◽  
Anterior Teeth ◽  
Characteristic Values ◽  
The Difference ◽  
Objective Basis ◽  
Dental Plaster

Introduction In this case report we present the aesthetical correction of crowded anterior teeth in a patient who has refused the orthodontic treatment. We also discuss how this correction can be resolved from the point of view of dental prosthetic and what measurements can be helpful in order to collect the data used to restore a satisfying smile on the patient’s face using dental ceramic restoration. Case presentation: A 32-year-old patient complained about his crowded incisors. We examined the incisal curvature, the proportion between the height and the width of the teeth, and the relation between the widths of the teeth and the golden proportion. The results of the measurements were compared to the characteristic values of the ideal denture. After the examination of the dental plaster cast, calculating the difference between the existing space and the necessary space, we were able to calculate the lack of space, which caused the crowded teeth. Conclusion: Along the prosthetic planning, these measurements may serve as a guideline to the dentist as an objective basis for the formation of an aesthetic denture and smile.

Minimally Invasive Adhesive Rehabilitation for a Patient With Tooth Erosion: Seven-year Follow-up

2019 ◽  
Vol 44 (1) ◽  
pp. E45-E57
Author(s):  
NI Pavesi Pini ◽  
LM De Marchi ◽  
AL Ramos ◽  
RC Pascotto
Keyword(s):  
Composite Resin ◽  
Tooth Wear ◽  
Restorative Dentistry ◽  
Posterior Teeth ◽  
Main Complaint ◽  
Anterior Teeth ◽  
Prevention And Treatment ◽  
Orthodontic Device ◽  
Scanning Electron

SUMMARY Tooth wear is a multifactorial condition of growing concern. In clinical practice, it is often a challenge for prevention and treatment since many etiological factors may be involved. This case report describes an esthetic rehabilitation of a young patient presenting tooth wear due to erosion. The etiological factor of this case was the patient sucking on lemons, an acidic fruit. The main complaint of the patient was the appearance of short maxillary incisors. The treatment involved orthodontic and restorative dentistry techniques. First of all, an orthodontic device was used to increase the vertical dimension of occlusion and create an adequate space for the direct restorations. The posterior teeth were restored with two direct composite resin techniques; the anterior teeth were then restored using a balanced occlusion. The seven-year follow-up of the case is presented. Replicas of the restorations were made and visualized under scanning electron microscopy up to the 12-month evaluation. In the clinical follow-up at seven years, maintenance of the results and restorations can be clearly seen.

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