Tsung-Chieh Yang

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OBJECTIVE To evaluate the retentive force and lateral force of an implant with various types of attachments for overdentures in relation to implant inclination. MATERIAL AND METHODS An implant (3.75 × 13 mm) was embedded into an acrylic resin block, simulating the edentulous ridge. Four different attachment systems were used, including: (1) Locator black(More)
PURPOSE The poor bone quality that exists in the posterior maxilla is associated with lower initial stability and higher failure rates in implants. This study examined the bone densities of edentulous posterior maxillae by computed tomography (CT). MATERIALS AND METHODS Based on CT images, the voxel values representing implant replacement in the posterior(More)
Seven implants provided with strain gauges were placed in an acrylic block to evaluate the biomechanical performance of short implants in splinted restorations. Two 7-mm-long implants with the same diameter (3.8, 4.4, or 5.0 mm) were splinted together (short-short implant splinted restoration [SS]) or individually with a 4.4 ? 12.0-mm implant (short-long(More)
PURPOSE To evaluate the biomechanical effects of platform switching on external- and internal-connection implants with regard to strain around the implants under loading. MATERIALS AND METHODS Implant analogs (5.0 × 12 mm) with external (EX) and internal (IN) connections were embedded into an acrylic resin block that simulated an edentulous ridge.(More)
This study evaluated secondary caries and periodontal conditions associated with metal (MCs) and composite resin copings (RCs) of abutment teeth for overdentures. The rates of secondary caries and periodontal problems in 70 root copings (41 MCs, 29 RCs) in 35 patients were retrospectively investigated for a period of 6.9 years. Statistical analysis was(More)
Gastric hamartomatous inverted polyp (HIP) is difficult to diagnose preoperatively because of its rarity [1,2]. It is pathologically benign, but has been reported as a paracancerous lesion [3–5], and therefore its diagnosis and treatment are clinically important. We report a case of gastric HIP and focus on its special characteristics on endoscopy and(More)
This study evaluated how the contact height between the magnetic attachment and denture base influences stability and bending strain. An implant modified with strain gauges and a magnetic attachment mounted in an acrylic resin block were used to characterize systems with varying degrees or heights of contact with the abutment. Bending strain under lateral(More)
OBJECTIVE The objective was to develop a new tissue conditioner using acetyl tributyl citrate (ATBC), tributyl citrate (TBC), and a novel hyperbranched polyester (TAH) with long-term stable viscoelasticity. METHODS Plasticizers, i.e., ATBC, TBC, TAH (number-average molecular weight, 1306 g/mol; weight-average molecular weight, 4245 g/mol), butyl phthalyl(More)
This retrospective report describes an individual prosthodontist's views regarding clinical factors that presumably influence the frequency of relining procedures (FRP) during the maintenance period of removable prostheses. Patient selection was composed of 60 removable prosthesis-wearing individuals who had been clinically monitored and maintained at(More)
This study aimed to clarify the efficacy of a newly developed self-adjusting magnetic attachment (SMAT) that allowed 0.4 mm of vertical and 8 degrees of rotational movements using an in vitro model. Comparison between the SMAT and a conventional magnetic attachment (CMAT) was performed for the retentive force under different dislodgement directions. Lateral(More)