Browsing by Author "Piyapanna Pumpaluk"

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    Biomechanical evaluation of splinted 4- and 6- millimeters short dental implants with different crown-implant ratios, a finite element analysis
    (Mahidol University. Mahidol University Library and Knowledge Center, 2024) Salaorat Bunnag; Piyapanna Pumpaluk; Surakit Visuttiwattanakorn
    The purpose of this study was to assess the influence of the crown height, and the crown to implant ratio, of two adjacent 4- and 6-millimeters short dental implants with connected and non-connected restorations on the distribution of stress to the implant abutment and periimplant structures, using a three-dimensional finite element method. Dental implants and abutments were scanned, and the scans were analysed using NX Nastran software to create finite element models. A total of 48 experimental states from 12 finite element models were initiated with different conditions according to diameter, length, crown height, and direction of the occlusal force. The results showed that crown height did not influence the stress concentration on implant abutment and surrounding bone under axial (90?) loading, while oblique (45?) loading strongly influenced the outcome. Increasing the crown to implant ratio from 1:1 to 2:1 resulted in increasing stress values 22.38-76.78%. The results of this study suggest that connecting two restorations does not have significance difference on stress distribution to implant. In splinted models, stress tends to concentrate on outer implant fixtures and peri-implant structures.
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    Comparison of physical properties of three commercial composite core buildup materials
    (2019-01-01) Sasinisa Warangkulkasemkit; Piyapanna Pumpaluk; Mahidol University
    © 2019, Japanese Society for Dental Materials and Devices. All rights reserved. Various materials have been used for core build-up when restoring the coronal portion of the tooth. Currently, bulk-fill resin composites have been produced to restore a large posterior cavity in single increment. This study aimed to evaluate the compressive strength, flexural strength, and microhardness of three commercial composite core build-up materials. All data were analyzed by oneway ANOVA and Tukey test methods (α=0.05.. Flexural strength data were subjected to Weibull statistics analysis. All three groups presented significant differences in the compressive strength, flexural strength, and Knoop hardness. FiltekTM Z350 XT had the greatest compressive strength (MPa. and Knoop hardness while FiltekTM bulk fill had the highest flexural strength. MultiCore®Flow had the lowest properties; however, it revealed the highest Weibull modulus (m. value. With regard to the properties tested in this study, bulk-fill resin composite can be used as an alternative to conventional resin composite for core build-up material.
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    A Pilot Study of Small-Diameter One-Piece Ceramic mp Placed in Anterior Regions: Clinical and Esthetic Outcomes at 1-Year Follow-up
    (2020-10-01) Chatchai Kunavisarut; Leerawan Buranaianyakul; Jira Kitisubkanchana; Piyapanna Pumpaluk; Mahidol University
    ©2020 by Quintessence Publishing Co Inc. Purpose:The aim of this study was to evaluate the clinical, esthetic, and patient-reported outcomes of one-piece zirconia implants placed in incisal areas using digital surgical templates after 1 year of follow-up. Materials and Methods: Patients who had lost an anterior tooth received a 3.3-mm-diameter zirconia implant placed by computer-guided surgery. Implant survival and soft tissue conditions were assessed periodically 1 week, 3 months, 6 months, and 1 year after loading. Standardized radiographs were taken at definitive prosthesis insertion and 1 year postloading to evaluate peri-implant bone loss. Additionally, the esthetic outcomes and patient-reported outcomes were also investigated. Results: Twenty zirconia implants were placed in 20 patients with no implants lost, resulting in 100% survival rates. A minor change in the mean marginal bone level (0.14 ± 0.87 mm) was found between definitive prosthetic loading and 12 months later. Peri-implant soft tissue remained stable throughout the observation period. The mean Pink Esthetic Score and White Esthetic Score were 12.05 and 8.60, respectively, while the mean Gingival Papilla Index scores were 1.55 at the mesial papilla and 1.65 at the distal papilla at the 1-year follow-up. The mean visual analog scale scores for patient perception of the overall process, speech, mastication, and esthetics were 93.3 ± 7.8, 95.1 ± 5.3, 93.6 ± 7.6, and 94.5 ± 6.2 mm, respectively. Conclusion: For the 1-year results, 3.3-mm-diameter one-piece ceramic implants placed by computer-guided surgery showed favorable clinical performances with no failure when used for single-tooth replacement in anterior regions. Int J Oral Maxillofac Implants 2020;35:965-973. doi: 10.11607/jomi.8308