Volume 50, Number 2, June 2017 The increased number of osteoblasts and capillaries in orthodontic tooth movement postadministration of Robusta coffee extract · The influence of artificial salivary pH on nickel ion release and the surface morphology of stainless steel bracket-nickel-titanium archwire combinations · Increase of collagen in diabetes-related traumatic ulcers after the application of liquid coconut shell smoke p-ISSN: 1978-3728 e-ISSN: 2442-9740 Volume 50, Number 2, June 2017 EDITORIAL BOARDS OF DENTAL JOURNAL (MAJALAH KEDOKTERAN GIGI) SK: 275/UN3.1.2/2017 January 3rd – December 31st, 2017 Patron: Dean of Faculty of Dental Medicine, Universitas Airlangga Advisors: Vice Dean I, Vice Dean II, Vice Dean III Chief Editor: Udijanto Tedjosasongko, drg., Ph.D., Sp.KGA(K) (Department of Pediatric Dentistry - Faculty of Dental Medicine, Universitas Airlangga) Editorial Boards Roeland Jozef Gentil De Moor (Department of Restorative dentistry and Endodontology, Dental School, Ghent University, Belgium); Cortino Sukotjo (University of Illinois at Chicago College of Dentistry, Department of Restorative Dentistry, Chicago, United States); Guang Hong (Liaison Center for Innovative Dentistry, Graduate School of Dentistry, Tohoku University, Japan); Kenji Yoshida (Department of Oral and Maxillofacial Surgery, School of Dentistry, Aichi Gakuin University, Nisshin, Japan); Miguel Rodrigues Martins (Co-Worker Aachen Dental Laser Center, RWTH Aachen University, Aachen, Germany); Sajee Sattayut (Department of Oral Surgery, Faculty of Dentistry, Khon Kaen University, Khon Kaen, Thai- land); Samir Nammour (Department of Dental Science, Faculty of Medicine, University of Liege, Belgium); Reza Fekrazad (Laser Reseach Center in Medical Science, Dental Faculty, AJA University of Medical Science, Tehran, Iran); Hong Sai Loh (Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, National University of Singapore, Singapore); Widowati Witjaksono (Kulliyah of Dentistry, International Islamic University Malaysia, Malaysia); Hamid Nurrohman (Missouri School of Dentistry & Oral Health A.T. Still University 800 W. Jefferson St. Kirksville, Mis- souri, USA, United States); Harry Huiz Peeters (Laser Research Center, Bandung, Indonesia); Rahmi Amtha (Department of Oral Medicine, Faculty of Dentistry, Universitas Trisakti, Indonesia); Elza Ibrahim Auerkari (Department of Oral Biology, Faculty of Dentistry, Universitas Indonesia, Indonesia); R. Darmawan Setijanto (Department of Dental Public Health, Faculty of Dental Medicine, Universitas Airlangga, Indonesia); Anita Yuliati (Department of Dental Material, Faculty of Dental Medicine, Universitas Airlangga, Indonesia). Managing Editors Rostiny (Department of Prosthodontics, Faculty of Dental Medicine, Universitas Airlangga, Indonesia); Markus Budi Rahardjo (Department of Oral Biology, Faculty of Dental Medicine, Universitas Airlangga, Indonesia); Sianiwati Goenharto (Faculty of Vocation, Universitas Airlangga, Indonesia); Ketut Suardita (Department of Conservative Dentistry, Faculty of Dental Medicine, Universitas Airlangga, Indonesia); Hendrik Setia Budi (Department of Oral Biology, Faculty of Dental Medicine, Universitas Airlangga, Indonesia); Anis Irmawati (Department of Oral Biology, Fac- ulty of Dental Medicine, Universitas Airlangga, Indonesia); Yuliati (Department of Oral Biology, Faculty of Dental Medicine, Universitas Airlangga, Indonesia). Assistant Editors Eric Prasetyo (Department of Conservative Dentistry, Faculty of Dental Medicine, Universitas Airlangga, Indonesia); Saka Winias (Department of Oral Medicine, Faculty of Dental Medicine, Universitas Airlangga, Indonesia). Peer-Reviewers Boy M. Bachtiar (Department of Oral Biology, Faculty of Dentistry, Universitas Indonesia, Indonesia); Trimurni Abidin (Department of Conserva- tive Dentistry, Faculty of Dentistry, Universitas Sumatera Utara, Indonesia); Al. Supartinah Santoso, (Department of Pediatric Dentistry, Faculty of Dentistry, Universitas Gadjah Mada, Indonesia); Pinandi Sri Pudyani (Department of Orthodontics, Faculty of Dentistry, Universitas Gadjah Mada, Indonesia); Siti Mardewi Soerono Akbar (Department of Conservative Dentistry, Faculty of Dentistry, Universitas Indonesia, Indonesia); Siti Su- narintyas (Department of Biomaterials, Faculty of Dentistry, Universitas Gadjah Mada, Indonesia); Anita Yuliati (Department of Dental Material, Faculty of Dental Medicine, Universitas Airlangga, Indonesia); Moh. Rubianto (Department of Periodontics, Faculty of Dental Medicine, Universitas Airlangga, Indonesia); Jenny Sunariani (Department of Oral Biology, Faculty of Dental Medicine, Universitas Airlangga, Indonesia); Sri Kunarti (Department of Conservative Dentistry, Faculty of Dental Medicine, Universitas Airlangga, Indonesia); Indeswati Diyatri (Department of Oral Biol- ogy, Faculty of Dental Medicine, Universitas Airlangga, Indonesia); Mieke Sylvia M.A.R (Department of Odontology Forensic, Faculty of Dental Medicine, Universitas Airlangga, Indonesia); Adi Hapsoro (Department of Dental Public Health, Faculty of Dental Medicine, Universitas Airlangga, Indonesia); Kus Harijanti (Department of Oral Medicine, Faculty of Dental Medicine, Universitas Airlangga, Indonesia); I.B. Narmada (Depart- ment of Orthodontics, Faculty of Dental Medicine, Universitas Airlangga, Indonesia); Theresia Indah Budhy (Department of Oral Pathology and Maxillofacial, Faculty of Dental Medicine, Universitas Airlangga, Indonesia); Wisnu Setyari (Department of Oral Biology, Faculty of Dental Medi- cine, Universitas Airlangga, Indonesia); Ira Arundina (Department of Oral Biology, Faculty of Dental Medicine, Universitas Airlangga, Indonesia); Maretaningtias Dwi Ariani (Department of Prosthodontics, Faculty of Dental Medicine, Universitas Airlangga, Indonesia); Taufan Bramantoro (Department of Dental Public Health, Faculty of Dental Medicine, Universitas Airlangga, Indonesia). Administrative Assistant: Novi Dian Prastiwi (Faculty of Dental Medicine, Universitas Airlangga); Abdullah Mas’udy (Faculty of Dental Medicine, Universitas Airlangga) Editorial Address: Faculty of Dental Medicine Universitas Airlangga Jln. Mayjen. Prof. Dr. Moestopo No. 47 Surabaya 60132, INDONESIA Telp. (+6231) 5039478/5030255. Fax. (031) 5039478/5020256 E-mail: dental_journal@yahoo.com; Website: www.e-journal.unair.ac.id/index.php/MKG Accredited No. 32a/E/KPT/2017 Cover photo purchased from: www.fotolia.com Invoice number: 208879494-206415982 CONTENTS Page Printed by: Airlangga University Press. (RK 334/08.17/AUP-B1E). Kampus C Unair, Mulyorejo Surabaya 60115, Indonesia. Telp. (031) 5992246, 5992247, Telp./Fax. (031) 5992248. E-mail: aup.unair@gmail.com Volume 50, Number 2, June 2017 p-ISSN: 1978-3728 e-ISSN: 2442-9740 1. The efficacy of sarang semut extract (Myrmecodia pendens Merr & Perry) in inhibiting Porphyromonas gingivalis biofilm formation Zulfan M. Alibasyah, Ambrosius Purba, Budi Setiabudiawan, Hendra Dian Adhita, Dikdik Kurnia, and Mieke H. Satari ............................................................................................. 55–60 2. The correlation between pH and flow rate of salivary smokers related to nicotine levels labelled on cigarettes Dewi Saputri, Abdillah Imron Nasution, Mutiara Rizki Wardani Surbakti, and Basri A. Gani ............................................................................................................................ 61–65 3. The effects of audio-video instruction in brushing teeth on the knowledge and attitude of young slow learners in Cirebon regency Yayah Sopianah, Muhammad Fiqih Sabilillah, and Oedijani ..................................................... 66–70 4. Increase of collagen in diabetes-related traumatic ulcers after the application of liquid smoke coconut shell Meircurius Dwi Condro Surboyo, Ira Arundina, and Retno Pudji Rahayu .............................. 71–75 5. Effects of strong bite force on the facial vertical dimension of pembarong performers Christina, Achmad Sjafei, and Ida Bagus Narmada ..................................................................... 76–79 6. The influence of artificial salivary pH on nickel ion release and the surface morphology of stainless steel bracket-nickel-titanium archwire combinations Ida Bagus Narmada, Natalya Tanri Sudarno, Achmad Sjafei, and Yuli Setiyorini .................. 80–85 7. Scaffold combination of chitosan and collagen synthesized from chicken feet induces osteoblast and osteoprotegerin expression in bone healing process of mice Saka Winias, Diah Savitri Ernawati, Maretaningtias Dwi Ariani, and Retno Pudji Rahayu .. 86–90 8. The increased number of osteoblasts and capillaries in orthodontic tooth movement post- administration of Robusta coffee extract Herniyati ........................................................................................................................................... 91–96 9. The inhibition of Streptococcus mutans glucosyltransferase enzyme activity by mangosteen pericarp extract Nirawati Pribadi, Yovita Yonas, and Widya Saraswati ................................................................ 97–101 10. Differences in surface roughness of nanohybrid composites immersed in varying concentrations of citric acid Gabriela Kevina Alifen, Adioro Soetojo, and Widya Saraswati .................................................. 102–105 11. The Effect of a combination of 12% spirulina and 20% chitosan on macrophage, PMN, and lymphocyte cell expressions in post extraction wound Nike Hendrijantini, Rostiny, Mefina Kuntjoro, Kevin Young, Bunga Shafira, and Yunita Pratiwi .......................................................................................................................... 106–110