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7th CAD/CAM & Computerized Dentistry
International Conference

06 - 07 October 2012, Marina Bay Sands Hotel

Confirmed 14 CPE Points

Organized by


Proud Supporter

SDA - Singapore Dental Association
Dental Tribune International Editorial (more...) | Welcome Message from Dr. Kuan Chee Keong, SDA President (more...) | Guest of Honnor: Prof. Patrick S K Tseng, BDS, MSc (more...) | Final Program >> (more...) | Conference Certification: 14 CPE Points attainable. |

Poster Presentations

Prashanthi Madhyastha

CAD/CAM in Dentistry - An Overview

Applications of CAD/CAM in dentistry are gaining popularity over the past 25 yrs. The technology finds its application for inlays, onlays, veneers, crowns, fixed partial dentures, implant abutment and even full mouth reconstruction which can be used in both dental laboratory and dental office. This poster gives an overview of CAD/CAM technology, discusses the materials and systems available, its advantages and disadvantages and also gives an insight into the future perspectives applicable to dental CAD/CAM.

Seung-Pyo Lee

Seung-Pyo Lee, D.D.S., M.S.D., Ph.D.

D.D.S. College of Dentistry, Seoul National University, Korea.
M.S.D. Graduate School, Seoul National University, Korea.
Ph.D. Graduate School, Seoul National University, Korea.
Full Time Instructor, Department of Oral Anatomy, School of Dentistry, Seoul National University (06/2001 - 10/2003).
Assistant Professor, Department of Oral Anatomy, School of Dentistry, Seoul National University (10/2003 - 04/2008).
Associate Professor, Department of Oral Anatomy, School of Dentistry, Seoul National University (04/2008 - present).
Research Assistant Professor, Department of Restorative Dentistry, School of Dentistry, University of Minnesota (07/2004 - 01/2006).
Assistant Dean of academic affairs, School of Dentistry, Seoul National University (01/2007 - 12/2008).
Chairman, Department of Oral Anatomy, School of Dentistry, Seoul National University (02/2009 - present).

Seung-Pyo Lee

Shin-Eun Nam

B.H.Sc. Dental Lab Science, Catholic University of Pusan, Korea (03/2002 - 02/2006).
Completed the course of M.S.D. - Ph.D. Graduate School, Seoul National University, Korea (09/2007 - 08/2010).

A Newly Developed Method Using 3-D Virtual Models for the Measurement of Interdental Space

show more/lessInterdental space is important for maintaining dental health because periodontitis is more prevalent and severe in this place than free surfaces. Conventional tooth brushing is not sufficient to clean and to keep clean, therefore interdental brush or floss silk is suggested as effective interdental cleaning aids. To test their cleaning efficacy, in vitro model with exact size and shape is useful although there were little study regarding interdental space size. Therefore, this study aimed to develop new interdental space measurement method using 3-D virtual models.

Maxillary dental casts from 22 young adults (mean age 24.23 +/- 0.69) and 22 middle-aged adults (mean age 49.82 +/- 7.23) were scanned and rendered as 3-D virtual models using Autoscan system for dental application. Seven reference points representing interdental space were registered on the virtual models buccal and lingual side, respectively. Two horizontal and frontal planes were generated using the reference points. The outer and inner circles were generated fitted to those planes based on least-squares method. The radii of circles were measured in both buccal and lingual interdental spaces, respectively. Mann-Whitney tests were applied to assess age-related differences in interdental space.

There were significant differences in the radii of all comparisons between two age groups (p /less/ .001), with the exception of outer circles of lingual interdental spaces (p = .098). The radii of interdental spaces were larger in middle-aged group than young group, within 0.206 - 0.454 mm. Especially, the maximum difference was shown in the inner circles of buccal interdental space. The inner circles representing the recession of interdental papilla were significantly larger in middle-aged group in both buccal and lingual portions.

In this study, new measuring method using 3-D virtual models were developed and the differences between age groups were compared. These results can be used as meaningful references for designing an interdental brushes and in vitro test model fabrication.

Dr. Enas Etajuri

Dr. Enas Etajuri and Dr. Eshamsul Sulaiman

Dr. Enas graduated by the Faculty of Dentistry and Oral Surgery, Tripoli University, Libya in 2007.
Practiced dentistry in public and privet clinics.
Trained at endodontic department of Al Azhar University, Egypt & Oral Surgery Department at Ain Shames University, Egypt. Got scholarship and started postgraduate study at University of Malaya, Malaysia in 2010 in MDSc program.

The Effect of Surface Treatment and Luting Cement on the Microtensile Bond Strength of Cerec CAD/CAM All-ceramic Crowns to Dentine

show more/lessTo evaluate the microtensile bond strength (µTBS) and failure mode of Cerec CAD/CAM all ceramic crowns bonded to dentine using different surface treatments and luting cements.

Thirty six human premolars were prepared for all-ceramic crowns. Occlusal dentine was cut flat and polished using 600 grit carbide paper. Thirty six all ceramic crowns were fabricated using Cerec ceramic blocs and CAD-CAM system (Sirona GmbH, Germany). The fitting surfaces were treated with either (1) 9% hydrofluoric acid etchant (N=18) or (2) 9 % hydrofluoric acid followed by silane coupling agent (N=18). Each group was subdivided into a group of six for cementation with three different cements (i) Calibra, (Dentsply/Caulk, USA) (ii) RelyX U200 (3M/ ESPE, USA) (iii) Fuji Plus (GC, Japan) respectively. After 24h of water storage at 37°C, all specimens were thermocycled 500 times in a bath of distilled water at 5 to 55°C. Each crown was then sectioned to produce two 1 mm2 microbars. The microbars were subjected to a microtensile load testing using a universal testing machine (Shimadzu, Japan) at crosshead speed 1mm/min. Debonded specimens were examined by stereomicroscope and SEM to determine the mode of failure. The Kruskal-Wallis test was used to detect overall significance, followed by Mann-Whitney U tests for multiple pairwise comparisons (P=.05).

Significant difference in µTBS was found within HF groups (p= 0.04). Mann-Whitney U test showed significant differences between RelyX U200 and both Calibra and Fuji Plus (p=0.003, p=0.006 respectively). In the HF+ silane groups, there was no significant difference in µTBS between groups (p=0.903). More adhesive failure at ceramic-cement interface and no cohesive failure were observed in all groups. Conclusion: Within the limitation of this study, Calibra and Fuji Plus produced significantly higher microtensile bond strength compared to RelyX U200 when Cerec all-ceramic crowns were treated with HF acid. Calibra luting cement produced significantly higher microtensile bond strength when Cerec all-ceramic crowns were etched with HF acid than using HF acid +SA. All specimens produced adhesive failure, mostly at ceramic-cement interfaces.

Se Hoon Kahm, D.D.S.

Mr. Se Hoon Kahm, D.D.S.

Mr. Se Hoon Kahm graduated from Seoul National University, Seoul, Korea with B.S. and D.D.S. (1998 - 2004) - College of Dentistry and phD (Unified Master's and Doctor's Course) of Dentistry (2006) - College of Medicine.
Mr. Kahm is a member of Korean Dental Association, The Korean Academy of Prosthodontics and The Korean Academy of Oral & Maxillofacial Implantology (since 2004), and a member of The Korean Academy of Osseointegration (since 2012).
Mr. Kahm is presently a Clinical Fellow in Prosthodontics, Seoul St.Mary's Hospital, Soeul, Korea (since May, 2012).

Digital Restoration of Dental Implant Prosthesis

show more/lessDigital workflow was introduced almost 30 years ago. Nowadays, fixed dental prostheses such as inlay, onlay, crown, and bridge fabricated by CAD/CAM procedures combined with digital impression systems are getting popular for development of scanner and milling machine. Besides, these systems are more comfort, cost effective and time saving for patients and dentists.

However, in implant prosthesis, digital restorations have not been familiar for the impression procedures and fabrication of implant suprastructures. In this report, CAD/CAM titanium-milled customized abutment and implant restorations fabricated in almost fully digital workflow, as follow.

A. CBCT & 3D image evaluation of patient and planning B. Prosthetic driven implant placement with surgical stent C. Digital impression used by iTero intra-oral scanning system(Cadent, NJ, US) D. CAD/CAM customized abutments & suprastructures made by iFit system(Dio, Busan, Korea) on CAD/CAM milled die E. Prosthesis delivery.

Case Report
  1. F/61 - #16 missing Single implant - customized abutment , screw & cement retained
  2. F/65 - #16,17,26,27,36,37,46,47 missing Single implant - customized abutment & screw & cement retained
  3. M/71 - mandibular edentulous (#46~#36 missing, 12 teeth) Provisional restoration - customized abutment, screw & cement retained
Digital restoration of dental implant in partial edentulous patient can be simplifying procedures, saving treatment time, laboratory time & money, preventing cross-infection, decreasing laboratory errors and making patient & dentist comfortable. However, this method cannot be applied immediately in fully edentulous mouth, further studies and researches are needed to apply full mouth cases.

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