scholarly journals A New Orthodontic Appliance with a Mini Screw for Upper Molar Distalization

2016 ◽  
Vol 2016 ◽  
pp. 1-4
Author(s):  
Nurhat Ozkalayci ◽  
Mehmet Yetmez
Keyword(s):  
Measurement Techniques ◽  
Force Level ◽  
Orthodontic Appliance ◽  
Molar Distalization ◽  
Second Molar ◽  
Permanent Molar ◽  
Intraoral Device ◽  
Molar Teeth ◽  
Main Components ◽  
Upper Molar

The aim of this study is to present a new upper molar distalization appliance called Cise distalizer designed as intraoral device supported with orthodontic mini screw for upper permanent molar distalization. The new appliance consists of eight main components. In order to understand the optimum force level, the appliance under static loading is tested by using strain gage measurement techniques. Results show that one of the open coils produces approximately 300 gr distalization force. Cise distalizer can provide totally 600 gr distalization force. This range of force level is enough for distalization of upper first and second molar teeth.

scholarly journals Endodontic treatment of a mandibular hypertaurodontic second molar

2015 ◽  
Vol 63 (2) ◽  
pp. 203-206
Author(s):  
Emmanuel João Nogueira Leal SILVA ◽  
Plínio Mendes SENNA ◽  
Tauby de Souza COUTINHO FILHO ◽  
Renato Liess KREBS
Keyword(s):  
Anatomical Variations ◽  
Endodontic Treatment ◽  
Study Objective ◽  
Second Molar ◽  
Clinically Normal ◽  
Permanent Molar ◽  
Root Sheath ◽  
Molar Teeth ◽  
Root Canal System ◽  
Apical Displacement

Taurodontism is the consequence of a developmental disorder in which the invagination of Hertwig's epithelial root sheath doesn't occur at a proper level. As a result, the pulp body and the chamber of a multi-root tooth, usually permanent molar teeth, are enlarged by the apical displacement of the pulp floor. Despite its clinically normal appearance, the morphological variation of this tooth can be diagnosed by a routine radiographic exam that shows enlarged apico-occlusal pulp chamber and short roots. Due to these anatomical variations, endodontic treatment of a taurodontic element is a clinical challenge given the complexity of localization and instrumentation of the root canal system. According to the degree of displacement of the pulp floor, taurodontism can be classified as: hypotaurodontism, mesotaurodontism and hypertaurodontism. This study objective is to report a clinical case of a patient who was submitted to endodontic treatment of the second inferior molar affected by hypertaurodontism.

scholarly journals Upper Second Molar Distalization with Clear Aligners: A Finite Element Study

2020 ◽  
Vol 10 (21) ◽  
pp. 7739
Author(s):  
Gabriele Rossini ◽  
Matteo Schiaffino ◽  
Simone Parrini ◽  
Ambra Sedran ◽  
Andrea Deregibus ◽  
...  
Keyword(s):  
Finite Element ◽  
Periodontal Ligament ◽  
Element Analysis ◽  
Molar Distalization ◽  
Force System ◽  
Second Molar ◽  
Maxillary Molar ◽  
Clinical Environments ◽  
Upper Molar ◽  
Element Study

Among orthodontists and scientists, in the last years, upper molar distalization has been a debated topic in the orthodontic aligner field. However, despite that few clinical studies have been published, no insights on aligners’ biomechanics regarding this movement are available. The aim of this study was to assess, through finite element analysis, the force system resulting in the upper arch during second maxillary molar distalization with clear aligners and variable attachments settings. The average tooth distalization was found to be 0.029, with buccal flaring of the upper incisors in all attachment configurations. The mesial deformation of the aligner was registered to be 0.2 mm on average. Different pressure areas on the interface between aligners and upper molars were registered, with the mesial attachment surface to be directly involved when present. Periodontal ligament pressure was reported to range between 67 g/cm2 and 132 g/cm2. Configurations with rectangular attachments from second molar-to-canine and from first molar-to-canine present, in an in silico environment, almost equal efficiency in distalizing the upper second molar. However, attachments from the second molar to the canine are suggested to be adopted in clinical environments due to greater feasibility in everyday practice.

PREVALENSI KARIES GIGI MOLAR SATU PERMANEN PADA ANAK UMUR 6-9 TAHUN DI SEKOLAH DASAR KECAMATAN TOMOHON SELATAN

e-GIGI ◽  
2015 ◽  
Vol 3 (2) ◽  
Author(s):  
Marsela Liwe ◽  
Christy N. Mintjelungan ◽  
Paulina N. Gunawan
Keyword(s):  
Elementary Schools ◽  
Dental Caries ◽  
Sampling Method ◽  
Permanent Teeth ◽  
Primary Data ◽  
Cross Sectional ◽  
Permanent Molar ◽  
Molar Teeth ◽  
Milk Teeth ◽  
Cross Sectional Design

Abstract: In children, caries occurs mostly at the age of 6 to 9 years. At the age of 6 years permanent molar teeth begin to erupt, therefore, they are more susceptible to caries. Moreover, at the age of 9 years, a period of mingled teeth where the number of permanent teeth and of the milk teeth are nearly the same. This study aimed to obtain the prevalence of dental caries of the first permanent molar among students of elementary schools in South Tomohon. This was a descriptive study with a cross-sectional design. The population of this study was 72 students aged 6-9 years old. Samples were obtained by using total sampling method. Primary data were obtained by examination of the teeth and mouth. The results showed that the prevalence of caries among students of elementary schools in South Tomohon was 68.1% (49 students). Based on gender, caries were most frequent among males (68.4%). Based on age, caries were most frequent among students of 8 years old (79.2%). Based on tooth element, tooth 36 had the highest incidence of caries (37.2%). Based on the severity of caries, dentine caries was the most frequent (46.51%).Keywords: dental caries, the first permanent molarAbstrak: Karies merupakan penyakit yang banyak menyerang anak-anak terutama umur 6 sampai 9 tahun. Pada umur 6 tahun gigi molar permanen sudah mulai tumbuh sehingga lebih rentan terkena karies dan umur 9 tahun merupakan periode gigi bercampur dimana jumlah gigi permanen dan gigi sulung dalam rongga mulut hampir sama. Penelitian ini bertujuan untuk mengetahui prevalensi karies gigi molar satu permanen pada anak di SD kecamatan Tomohon Selatan. Penelitian ini menggunakan metode deskriptif observasional dengan pendekatan potong lintang. Populasi penelitian yaitu anak umur 6 - 9 tahun di SD kecamatan Tomohon Selatan dengan jumlah 72 orang. Sampel penelitian digunakan total sampling. Metode pengambilan data secara primer yaitu dengan pemeriksaan gigi dan mulut. Hasil penelitian menunjukkan prevalensi karies pada anak-anak di SD kecamatan Tomohon Selatan mencapai 68,1% dengan jumlah 49 anak. Berdasarkan jenis kelamin angka kejadian karies tertinggi didapatkan pada anak laki-laki mencapai 26 anak (68,4%). Berdasarkan usia angka kejadian karies tertinggi didapatkan pada usia 8 tahun mencapai 19 anak (79,2%). Berdasarkan elemen gigi, gigi 36 merupakan yang paling tinggi angka kejadian kariesnya yaitu 32 gigi (37,2%) dan berdasarkan tingkat keparahan karies kejadian karies dentin yang paling tinggi yaitu mencapai 40 gigi (46,51%).Kata kunci: karies gigi, molar satu permanen

New design for unilateral upper molar distalization with bone anchorage system

2019 ◽  
pp. 1-4
Keyword(s):  
Patient Compliance ◽  
Tooth Movement ◽  
Molar Distalization ◽  
Anchorage System ◽  
Conventional Methods ◽  
Upper Molar ◽  
Bone Anchorage

Molar distalization is considered as a good approach for creating space. Conventional methods were depended on patient compliance but with se of mini screw, tooth movement are done more rapidly, easily and non-compliance. Our design is useful for unilateral upper molar distalization by modified power arm that is connected to mini screw by elastic chain.

scholarly journals Comparison of one versus two maxillary molars distalization with iPanda: a finite element analysis

2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Kamontip Sujaritwanid ◽  
Boonsiva Suzuki ◽  
Eduardo Yugo Suzuki
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Alveolar Bone ◽  
Vertical Direction ◽  
Minimal Amount ◽  
Element Analysis ◽  
Molar Distalization ◽  
Second Molar ◽  
Maxillary Molars ◽  
Displacement Patterns

Abstract Background The purpose of this study was to compare the stress distribution and displacement patterns of the one versus two maxillary molars distalization with iPanda and to evaluate the biomechanical effect of distalization on the iPanda using the finite element method. Methods The finite element models of a maxillary arch with complete dentition, periodontal ligament, palatal and alveolar bone, and an iPanda connected to a pair of midpalatal miniscrews were created. Two models were created to simulate maxillary molar distalization. In the first model, the iPanda was connected to the second molar to simulate a single molar distalization. In the second model, the iPanda was connected to the first molar to simulate “en-masse” first and second molar distalization. A varying force from 50 to 200 g was applied. The stress distribution and displacement patterns were analyzed. Results For one molar, the stress was concentrated at the furcation and along the distal surface in all roots with a large amount of distalization and distobuccal crown tipping. For two molars, the stress in the first molar was 10 times higher than in the second molar with a great tendency for buccal tipping and a minimal amount of distalization. Moreover, the stress concentration on the distal miniscrew was six times higher than in the mesial miniscrew with an extrusive and intrusive vector, respectively. Conclusions Individual molar distalization provides the most effective stress distribution and displacement patterns with reduced force levels. In contrast, the en-masse distalization of two molars results in increased force levels with undesirable effects in the transverse and vertical direction.

scholarly journals Efficiency of the skeletonized Pendulum K appliance for non-compliance maxillary molar distalization

2021 ◽  
Author(s):  
Gero Stefan Michael Kinzinger ◽  
Jan Hourfar ◽  
Jörg Alexander Lisson
Keyword(s):  
Side Effects ◽  
Lower Percentage ◽  
Molar Distalization ◽  
Maxillary Molars ◽  
Maxillary Molar ◽  
Force Moment ◽  
Maxillary Premolars ◽  
Anchorage Loss ◽  
Upper Molar

Abstract Purpose Conventional anchorage with exclusively intraorally anchored appliances for non-compliance molar distalization combines a palatal acrylic button with periodontal anchorage. This type of anchorage is critically discussed because of the temporary hygienic impairment of the palate and the uncertain anchoring quality of the button. A purely dentally/periodontally anchored Pendulum K appliance was developed, which is exclusively anchored via four occlusal rests. The aims of this pilot study were to examine the suitability of the skeletonized Pendulum K for distalization of maxillary molars, and to investigate the quality of this alternative anchoring modality. Patients and methods In all, 10 patients received skeletonized Pendulum K appliances attached to all maxillary premolars for bilateral molar distalization. Supporting anchorage through an acrylic button adjacent to the anterior palate was not used. The pendulum springs were initially activated on both sides with a distalization force of 220 cN each and provided with uprighting and toe-in bends. The specific force/moment system was regularly reactivated intraorally by adjustment of the distal screw. Results The study demonstrates the suitability of the skeletonized Pendulum K appliance for the distalization of maxillary molars (3.28 ± 0.73 mm). Side effects on the molars were slight distal tipping (3.50 ± 2.51°/PP, 3.00 ± 1.41°/SN) and mesial inward rotation (average 2.75 ± 7.50° and 4.50 ± 12.77°). Significant anchorage loss occurred in the form of mesialization of the incisors by 1.40 ± 0.82 mm and of the first premolars by 2.28 ± 0.85 mm. Conclusion The skeletonized Pendulum K appliance allows compliance-free upper molar distalization. Exclusively dental/periodontal anchorage resulted in a lower percentage of molar distalization compared to a conventional anchoring preparation of the Pendulum K with a palatal acrylic button. Anchorage loss had a comparatively stronger effect on the anchoring premolars but less on the incisors. Typical side effects on the molars such as distal tipping and mesial inward rotation were remarkably low.

Incidence of Lower Second Permanent Molar Impaction

1988 ◽  
Vol 15 (3) ◽  
pp. 199-203 ◽  
Author(s):  
Ruth Evans
Keyword(s):  
Deciduous Teeth ◽  
Control Group ◽  
Second Molar ◽  
Permanent Molar ◽  
Two Samples ◽  
Orthodontic Patients

The incidence of lower second molar impaction was investigated, comparing the records of two samples of 200 orthodontic patients referred consecutively, in 1976 and 1986. A further study compared 50 cases showing both bilateral and unilateral impactions, with a non-impacted control group. This allowed possible causes of the impactions to be examined, particularly concerning the effect of premature loss of deciduous teeth on the distribution of crowding.

Independent regulation of Dlx2 expression in the epithelium and mesenchyme of the first branchial arch

Development ◽  
2000 ◽  
Vol 127 (2) ◽  
pp. 217-224 ◽  
Author(s):  
B.L. Thomas ◽  
J.K. Liu ◽  
J.L. Rubenstein ◽  
P.T. Sharpe
Keyword(s):  
Tooth Development ◽  
Branchial Arch ◽  
Oral Epithelium ◽  
Upstream Sequence ◽  
Loss Of Function ◽  
Signalling Molecules ◽  
Molar Teeth ◽  
Overlapping Domains ◽  
Upper Molar

Dlx2, a member of the distal-less gene family, is expressed in the first branchial arch, prior to the initiation of tooth development, in distinct, non-overlapping domains in the mesenchyme and the epithelium. In the mesenchyme Dlx2 is expressed proximally, whereas in oral epithelium it is expressed distally. Dlx2 has been shown to be involved in the patterning of the murine dentition, since loss of function of Dlx1 and Dlx2 results in early failure of development of upper molar teeth. We have investigated the regulation of Dlx2 expression to determine how the early epithelial and mesenchymal expression boundaries are maintained, to help to understand the role of these distinct expression domains in patterning of the dentition. Transgenic mice produced with a lacZ reporter construct, containing 3.8 kb upstream sequence of Dlx2, led to the mapping of regulatory regions driving epithelial but not mesenchymal expression in the first branchial arch. We show that the epithelial expression of Dlx2 is regulated by planar signalling by BMP4, which is coexpressed in distal oral epithelium. Mesenchymal expression is regulated by a different mechanism involving FGF8, which is expressed in the overlying epithelium. FGF8 also inhibits expression of Dlx2 in the epithelium by a signalling pathway that requires the mesenchyme. Thus, the signalling molecules BMP4 and FGF8 provide the mechanism for maintaining the strict epithelial and mesenchymal expression domains of Dlx2 in the first arch.

scholarly journals A case of tooth fracture occurred upon medicating bisphosphonate for an elderly person: Preservation therapy and responses for Stage 0 of bisphosphonate-related osteonecrosis of jaw

2017 ◽  
Vol 11 (02) ◽  
pp. 258-263
Author(s):  
Noriko Suzuki ◽  
Hitoshi Oguchi ◽  
Yu Yamauchi ◽  
Yasuyo Karube ◽  
Yukimi Suzuki ◽  
...  
Keyword(s):  
Elderly Person ◽  
Signs And Symptoms ◽  
Apical Position ◽  
X Ray ◽  
Second Molar ◽  
Tooth Fracture ◽  
Molar Teeth ◽  
Osteonecrosis Of Jaw ◽  
Bone Exposure ◽  
Symptoms And Signs

ABSTRACTThis case report aimed to report the progress of preservation therapy and response of symptoms and signs for Stage 0 of bisphosphonate-related osteonecrosis of jaw (BRONJ). A 68-year-old female was recognized having a tooth at the left upper first molar fracture upon medicating bisphosphonate (BP) in 2007. At that time, the extraction of the tooth was an absolute contraindication. Therefore, we performed preservation therapy. We observed the symptoms and signs every month. After 5 months, swelling and redness in the entire first molar tooth were seen and fistula formed partly. Bone exposure was not seen. We administrated antibiotics immediately. As a result, symptoms disappeared. On April 10, 2009, the patient visited us as she felt a sense of incongruity in the lower left first and second molar teeth. Clinically, there were no symptoms of pain. However, we observed the radiolucent finding in about 5 mm diameter at apical position by X-ray photography; we considered a possibility of Stage 0 for BRONJ. We immediately administered medicine for 5 days and the symptoms disappeared. At present, no inflammation with signs and symptoms at the upper left first molar and lower left first, second molar parts is shown. We performed preservation therapy for tooth fracture case medicating of BP. Immediate responses for inflammation and symptoms of the Stage 0 of BRONJ have led to success. Hence, dentists should perform regular clinical observation, and enough education to the patient for BRONJ is necessary.

Sign in / Sign up

Export Citation Format

Share Document