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Cone-beam computed tomography observation of maxillary first premolar canal shapes

Yoza T, Serikawa M, Sugita T, Harada T, Usami A

A variety of shapes has been reported for the roots and root canals of maxillary first premolars. The purposes of the present study were to determine branching and shapes of...
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Anesthetic efficacy and safety of 2% lidocaine hydrochloride with 1:100,000 adrenaline and 4% articaine hydrochloride with 1:100,000 adrenaline as a single buccal injection in the extraction of maxillary premolars for orthodontic purposes

Deshpande N, Jadhav A, Bhola N, Gupta M

Background: Palatal injection of local anesthetics is the most painful injection. To obviate the need for palatal injections, local anesthetic agents with diffusibility are being investigated. Hence the present study...
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Debris removal efficiency depend on different ultrasonic irrigation protocols

Heo G, Kim JW, Cho KM, Enkhbileg N, Lee EH, Park SH

Purpose: The purpose of this study is comparing the efficiency of debris removal of passive ultrasonic irrigation depend on different protocols. Materials and Methods: Forty-eight mandibular premolars were randomly divided...
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Changes in maximum lip-closing force after extraction and nonextraction orthodontic treatments

Choi TH, Kim SH, Kim C, Kook YA, Larson BE, Lee NK

OBJECTIVE: The aims of the present study were to evaluate the changes in the maximum lip-closing force (MLF) after orthodontic treatment with or without premolar extractions and verify the correlation...
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Three-dimentional finite element analysis of a mandibular premolar with reduced periodontal support under a non-axial load

Yang SM, Chung HJ

This study analyzed stress profiles of a mandibular premolar and its supporting periodontium under non-axial occlusal load as a function of the level of periodontal bone support using finite element...
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Surgical extrusion of a maxillary premolar after orthodontic extrusion: a retrospective study

Choi YH, Lee HJ

OBJECTIVES: Crown-root fracture and cervical caries in maxillary premolars constitute a challenge in cases of subgingival placement of restoration margins. Surgical extrusion has been practiced successfully in permanent anterior teeth....
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Chewing performance in orthodontic patients treated with extraction of premolars

Jang I, Jang E, Choi DS, Cha BK

The purpose of the present study was to evaluate the kinematic parameters of the chewing cycles in patients who had undergone comprehensive orthodontic treatment with extraction of premolars and to...
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A study on the occlusal wear patterns in maxillary posterior teeth with palatal side abfractions

Song JH, Kim HJ, Lee GJ

PURPOSE: Aims to analyze the occlusal wear patterns in maxillary posterior teeth with palatal side abfractions and study the association between occlusal force and abfractions. MATERIALS AND METHODS: This study was...
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Load response of the natural tooth and dental implant: A comparative biomechanics study

Robinson D, Aguilar L, Gatti A, Abduo J, Lee PV, Ackland D

PURPOSE: While dental implants have displayed high success rates, poor mechanical fixation is a common complication, and their biomechanical response to occlusal loading remains poorly understood. This study aimed to...
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Tooth Agenesis and Delay in Patients with Agenesis of Mandibular Second Premolars

Park M, Kim SO, Song JS, Lee J

Tooth agenesis is a common human dental anomaly and the agenesis of mandibular second premolars has been proven to be the most frequently observed. The aim of this study is...
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Effect of ferrule on the fracture resistance of mandibular premolars with prefabricated posts and cores

Kim AR, Lim HP, Yang HS, Park SW

PURPOSE: This study evaluated fracture resistance with regard to ferrule lengths and post reinforcement on endodontically treated mandibular premolars incorporating a prefabricated post and resin core. MATERIALS AND METHODS: One hundred...
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The efficacy of ultrasonic irrigation technique on debris removal during root canal treatment

Kim JH, Kim JW, Cho KM, Park SH

PURPOSE: The purpose of this study was comparing the efficacy of passive irrigation (PI) and passive ultrasonic irrigation (PUI) for ability to remove debriment of canals. MATERIALS AND METHODS: Mandibular premolars...
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A comparison of the fracture resistances of endodontically treated mandibular premolars restored with endocrowns and glass fiber post-core retained conventional crowns

Guo J, Wang Z, Li X, Sun C, Gao E, Li H

PURPOSE: This in-vitro study aimed to evaluate the fracture resistances and failure modes of endodontically treated mandibular premolars restored with endocrowns and conventional post-core retained crowns. MATERIALS AND METHODS: Thirty mandibular...
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Endodontic treatment of a C-shaped mandibular second premolar with four root canals and three apical foramina: a case report

Bertrand T, Kim SG

This case report describes a unique C-shaped mandibular second premolar with four canals and three apical foramina and its endodontic management with the aid of cone-beam computer tomography (CBCT). C-shaped...
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Occlusal Surface Analysis of Mandibular Premolars in Koreans

Yoo HI, Park HY, Kim SH

The aim of this study was to investigate the characteristics of mandibular premolars regarding size and morphology in Koreans. Moreover, comparisons of gender difference in mandibular premolars were examined to...
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Differences in the mandibular premolar positions in Angle Class I subjects with different vertical facial types: A cone-beam computed tomography study

Duan J, Deng F, Li WS, Li XL, Zheng LL, Li GY, Bai YJ

OBJECTIVE: To compare the positions of the mandibular premolars in Angle Class I subjects according to vertical facial type. The results will provide a theoretical basis for predicting effective tooth...
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Use of cone-beam computed tomography and three-dimensional modeling for assessment of anomalous pulp canal configuration: a case report

Sinanoglu , Helvacioglu-Yigit D, Mutlu I

Three-dimensional (3D) reconstruction of cone-beam computed tomography (CBCT) scans appears to be a valuable method for assessing pulp canal configuration. The aim of this report is to describe endodontic treatment...
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Fracture resistance of endodontically treated maxillary premolars restored by silorane-based composite with or without fiber or nano-ionomer

Shafiei F, Tavangar M, Ghahramani Y, Fattah Z

PURPOSE: This in vitro study investigated the fracture resistance of endodontically treated premolars restored using silorane- or methacrylate-based composite along with or without fiber or nano-ionomer base. MATERIALS AND METHODS: Ninety-six...
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Study of endodontic working length of Korean posterior teeth

Kim JY, Lee SH, Lee GH, Park SH

OBJECTIVES: The aim of this study was to investigate average working lengths of Korean posterior teeth and evaluate validity of endodontic file length. MATERIALS AND METHODS: The endodontic working length of...
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Root canal treatment of a mandibular second premolar with three separate root canals

Lee SR, Shin SH, Hong SO, Song CK, Chang HS, Min KS

Mandibular premolars show a wide variety of root canal anatomy. Especially, the occurrence of three canals with three separate foramina in mandibular second premolars is very rare. This case report...
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