Ting-Hsun Lan

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OBJECTIVE To compare the differences between the right and left ovarian responses in patients undergoing standard in vitro fertilization (IVF) treatment. DESIGN Prospective, observational study. SETTING A university hospital in Taiwan. PATIENT(S) Seven hundred eighty-nine consecutive patients undergoing IVF or intracytoplasmic sperm injection. (More)
OBJECTIVE To compare the results of IVF and intracytoplasmic sperm injection (ICSI) in extremely low oocyte retrieval cycles. DESIGN Case-control study. SETTING An IVF laboratory in a university hospital in Taiwan. PATIENT(S) Between January 2003 and December 2007, infertile couples with one, two, or three oocytes per retrieval were divided into two(More)
This study evaluates the influence of different implant materials on the primary stability of orthodontic mini-implants by measuring the resonance frequency. Twenty-five orthodontic mini-implants with a diameter of 2 mm were used. The first group contained stainless steel mini-implants with two different lengths (10 and 12 mm). The second group included(More)
Clinically, many implant cases with different angulation over the lower posterior area have been found. The purpose of this study was to analyze the bony stress with different implant tilting during normal masticatory load using the finite element method (FEM), with the hope of discovering a desirable installation of implant. A three-dimensional finite(More)
PURPOSE Ideally, implants for dental prostheses should be placed parallel to each other. However, anatomic limitations sometimes make nonparallel implants necessary. The purpose of this study was to determine the bone stresses on implants tilted at various angles and to determine what arrangements might carry a higher risk of failure. MATERIALS AND(More)
STATEMENT OF PROBLEM The use of monolithic zirconia crowns in implant prostheses is increasing, especially when the interdental space is insufficient. However, fractures have been reported in clinical practice. PURPOSE The purpose of this study was to determine the minimal thickness of a complete zirconia crown used for an implant prosthesis in the(More)
Threaded implants have been shown to play an important role in increasing mechanical osseointegration. The aim of this study was to determine bone stress distribution when using different types of implant thread pitches and designs. Five 3D finite element models were constructed to simulate bone stresses induced in implant bodies with two types of thread(More)
BACKGROUND The purpose of this study is to analyze biomechanical interactions in the alveolar bone surrounding implants with smaller-diameter abutments by changing position of the fixture-abutment interface, loading direction, and thickness of cortical bone using the finite element method. METHODS Twenty different finite element models including four(More)
Oral appliances are a range of devices that are designed to alter upper airway patency. The efficiency of these appliances for treatment of obstructive sleep apnea (OSA) has been rarely discussed. This case report describes two designs of mandibular repositioning appliances used to treat OSA. A 36-year-old man was diagnosed with mild OSA by his physician. A(More)
Conical crown-retained dentures (CCRD) show a higher survival rate and greater patient satisfaction than transitional removable partial dentures during long-term follow-up. However, unsustainable denture retention force on supporting abutments after initial delivery and loss retention are frequently seen in long-term follow-up of clinical cases. The main(More)