The Histological Structures and the Developmental Process of Mandibular Molar Teeth in Rabbits

1973 ◽  
Vol 26 (6) ◽  
pp. 376-399
Author(s):  
Yasunari Uchida
Keyword(s):  
Developmental Process ◽  
Mandibular Molar ◽  
Molar Teeth

Effects of Various Antioxidant Pretreatment Modalities on Adhesion to Sound and Caries-Affected Dentin: An In Vitro Study

2021 ◽  
pp. 232020682199798
Author(s):  
Beyza Unalan Degirmenci ◽  
Alperen Degirmenci ◽  
Emine Kara
Keyword(s):  
Bond Strength ◽  
In Vitro Study ◽  
Natural Antioxidants ◽  
Microtensile Bond Strength ◽  
Mandibular Molar ◽  
Electron Microscopy Analysis ◽  
Molar Teeth ◽  
Microscopy Analysis ◽  
Two Parameters

Aim: Natural antioxidants were offered as the answer of dentin adhesion issue. The aim of this study is to investigate the effects of proanthocyanidin and lycopene as pretreatment agents on the sound and caries-affected dentin surface on microtensile bond strength and microleakage. Materials and Methods: This study was designed as in vitro because of that 84 mandibular molar teeth were collected. Forty-two of the included teeth were carious teeth, while the other 42 were without caries. Sixty of them were used for microleakage and 24 for microtensile bond strength testing and scanning electron microscopy analysis. The samples were divided into six subgroups randomly according to dentin pretreatments: 5% proanthocyanidin, 5% lycopene, and no antioxidant application. After the restorative procedures, samples were attached to the microtensile tester. Samples were subjected to tensile stress in the load cell until they broke at a speed of 0.5 mm per min. Microtensile bond strength (µTBS) and microleakage test data were analyzed with two-way analysis of variance, Bonferroni correction, and Tamhane’s T2 tests. Results: Two-way variance analysis showed that dentin pretreatment applications, dentin substrate, and the interaction between these two parameters had statistically significant effects on µTBS values ( P < .001). There was no difference between dentin pretreatment applications in terms of microleakage scores ( P > .05). Conclusion: The application of dentin pretreatment with proanthocyanidin is a successful procedure that increases the bond strength in both dentin substrate, while pretreatment with lycopene in caries-affected dentin reduces it.

scholarly journals Relationship between nutritional status and eruption of first permanent mandibular molar teeth among the school children in Indonesia

2013 ◽  
Vol 2 (2) ◽  
pp. 85-86
Author(s):  
Syukra Alhamda
Keyword(s):  
Public Health ◽  
Nutritional Status ◽  
East Asia ◽  
School Children ◽  
South East Asia ◽  
Mandibular Molar ◽  
Molar Teeth

Abstract not available DOI: http://dx.doi.org/10.3329/seajph.v2i2.15962 South East Asia J Public Health | Jul-Dec 2012 | Vol 2 Issue 2 | 85-86

scholarly journals Hemisection of a Mandibular Molar

2013 ◽  
Vol 1 (1) ◽  
pp. 18-22
Author(s):  
SM Abdul Quader ◽  
M Shamsul Alam ◽  
M Osman Ghani Khan ◽  
A Asgor Moral
Keyword(s):  
Bone Loss ◽  
Simple Procedure ◽  
Severe Bone Loss ◽  
Mandibular Molar ◽  
Molar Teeth ◽  
The Individual

Teeth once designated obsolete for rehabilitation and deemed for extraction should be re-evaluated for salvaging two thirds or even one third component of the individual teeth. Advances in dentistry, as well as the increased desire of patients to maintain their dentition, have lead to treatment of teeth that once would have been removed. In order to carry out this present day mandate, periodontally diseased teeth with severe bone loss and/or mandibular molar teeth exhibiting furcation invasions may well be retained by removal of one or more of their roots. This article describes a simple procedure for root amputation in mandibular molar and its subsequent restorations. DOI: http://dx.doi.org/10.3329/updcj.v1i1.13949 Update Dent. Coll. j: 2011; 1 (1): 18-22

scholarly journals Focal Palatitis (Previously Focal Palatine Erosions) in Captive Cheetahs (Acinonyx jubatus)

2021 ◽  
Vol 8 ◽  
Author(s):  
Gerhard Steenkamp ◽  
Sonja C. Boy ◽  
Paul J. van Staden ◽  
Marthán N. Bester
Keyword(s):  
Molar Tooth ◽  
Permanent Teeth ◽  
Foreign Material ◽  
Acinonyx Jubatus ◽  
Inflammatory Lesions ◽  
Skull Development ◽  
Mandibular Molar ◽  
Molar Teeth ◽  
A Prospective Study

Focal palatine erosion (FPE) is a misleading term that is used in the literature to describe inflammatory lesions associated with depressions of the palatal mucosa in cheetah. Cheetahs have large cheek teeth and these depressions are formed to accommodate them. Previously FPE was only described as a mandibular molar tooth malocclusion on the hard palate due to suspected rotation and super eruption of the mandibular molar teeth of cheetahs aged 18 months and older. Two hundred and fifty six cheetahs (135 male, 121 female), originating from two independent facilities, had their oral cavities evaluated as part of an annual health visit over a decade. Ninety-nine cheetahs were seen once, 59 cheetahs were seen twice, 33 were seen three times, 43 on four occasions, 16 on five occasions, 5 on six occasions, and 1 cheetah was seen seven times. Apart from these clinical cases a prospective study on 5 cheetah cubs (3 male and 2 female) was conducted to document their skull development and mandibular molar tooth eruption over a period of 25 months. Of the 261 cheetahs observed none developed rotation or super eruption of their mandibular molar teeth. The term FPE is a misnomer as these inflammatory lesions were found in palatal depressions opposing any of the cusps of all of the cheetah mandibular cheek teeth. It consisted mainly of deep ulcerations, inflammation and oedema and also micro abscess formation. In severe cases oro-nasal fistulas were present. Of all the depressions present on the cheetah's palate, the large one palatal to the 4th maxillary premolar tooth was most commonly affected. In the five cubs evaluated prospectively, focal palatitis was evident from the 7 month evaluation, before all the permanent teeth erupted. Conservative treatment of the inflamed depressions by removing the foreign material through curettage and copious flushing reduced the grade of the inflammation when observed on follow-up. Focal palatine erosion is an incorrect term used to describe focal palatitis that occurs randomly in cheetahs. This focal palatitis is often associated with foreign material trapped in the palatal depressions. Conservative management is sufficient to treat these animals without odontoplasties.

scholarly journals Radix Entomolaris in the Mandibular Molar Teeth of an Iranian Population

2017 ◽  
Vol 2017 ◽  
pp. 1-4 ◽  
Author(s):  
Maryam Kuzekanani ◽  
Laurence J. Walsh ◽  
Jahangir Haghani ◽  
Ali Zeynali Kermani
Keyword(s):  
Root Length ◽  
Type I ◽  
Exact Test ◽  
Second Molar ◽  
Type Iii ◽  
Dental Clinics ◽  
Mandibular Molar ◽  
Molar Teeth ◽  
Distolingual Root ◽  
The Difference

Purpose. Supernumerary roots in permanent mandibular molar teeth make endodontic treatment more complicated. The aim of this study was to determine the prevalence of Radix Entomolaris (RE) in permanent mandibular first and second molars in the population of Kerman, in the southeast of Iran. Materials and Methods. From a collection of 500 mandibular first and second molar teeth extracted over 2015-2016 at dental clinics in Kerman, teeth were scored for an additional distolingual root, and the average root length and root morphology of this extra root were determined using the De Moor classification scheme. Results. In this population, RE occurred in 6% of mandibular first molars (4% with a straight apex (Type I) and 2% with buccal apical curvature (Type III)). In all cases, RE was the shortest root, with an average root length of 18.37 mm. RE occurred in only 0.8% of mandibular second molars, with an average root length of 18.0 mm. All mandibular second molars with RE were of Type III. Fisher’s exact test showed that the difference in frequency between first and second molars was statistically significant (two-sided P=0.002). Conclusion. Radix Entomolaris occurs more frequently in mandibular first molars than in mandibular second molars in this sample of 500 mandibular molars. The reported rate of 6% in first molars is expected to be higher than reported rates in European or Caucasian populations where the prevalence is typically less than 2%.

Comparison of Micro-Computed Tomography and Digital Intraoral Radiography to Determine the Accuracy of Digital Radiographic Measurements of Mandibular Molar Teeth in Dogs

2017 ◽  
Vol 34 (4) ◽  
pp. 248-258
Author(s):  
Louise Marron ◽  
Jennifer Rawlinson ◽  
Kirk McGilvray ◽  
Ben Prytherch
Keyword(s):  
Computed Tomography ◽  
Root Canal ◽  
Intraoral Radiography ◽  
Structural Representation ◽  
Micro Computed Tomography ◽  
Radiographic Measurements ◽  
Canal Width ◽  
Mandibular Molar ◽  
Molar Teeth ◽  
Digital Intraoral Radiography

Introduction: The purpose of this study was to compare root and root canal width measurements between digital intraoral radiography (IOR) and micro-computed tomography (μCT). The accuracy of IOR measurements of canine mandibular molars was scrutinized to assess feasibility of developing a model to estimate animal age based on dentinal thickness. Materials and Methods: Thirty-nine canine mandibular first molars were imaged using μCT and IOR. For each tooth, the root and root canal width of the mesial and distal roots were measured by a single observer at 3 marked sites on μCT and IOR. Two different software programs were used to measure the radiographs. The radiograph measurements were compared to each other and to the μCT measurements. The μCT images were considered the anatomic reference standard for structural representation. Results: The data collected demonstrated IOR bias and variability throughout all measurement sites, with some sites being more affected than others. Neither IOR system produced unbiased measurements that closely reflected the μCT measurements consistently. The overall lack of agreement between measurements demonstrated the difficulties in developing a standardized protocol for measuring root and root canal width for the first molar teeth in dogs. Conclusion: Developing a protocol to accurately measure and compare μCT and IOR measurements is challenging. Designing a measurement system that would allow for universal application to age dogs would require continued research utilizing a standardized approach to overcome the limitations identified in this article.

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