The research examines the lexical cohesive devices in the textbook Tiếng Anh 10 published by Vietnam Education Publishing House. This study employs a documentary method of analysis to answer the research question. In particular, Halliday and Hasan’s framework of cohesion in discourse (1976) was adopted to investigate ten reading texts in the reading section. The findings show that in terms of reiteration, repetition is the most frequently used device in all reading texts to make the reading semantically related, while collocation cohesion produces cohesive effects among words and phrases in the same collocational environment. As a result, students will benefit greatly from such lexical cohesion in terms of grasping the meaning of the reading texts, and boosting their reading comprehension and theme-based vocabulary. Hopefully, this article is a preliminary study for further research on applying lexical cohesion in teaching and learning reading comprehension or writing skills.
BACKGROUND: Maxillary Lefort I osteotomy, mandibular bilateral sagittal split ramus was frequently used in correcting skeletal class III malocclusion. There was a lack of research on class III malocclusion patients’ quality of life (QoL) after bimaxillary osteotomy.
AIM: Class I Intermaxillary relationship was achieved, aesthetic was significantly improved. Significant improvement in Class III skeletal patients’ quality of life was acquired. The achievement of harmonious face would be beneficial to the facial aesthetics of patients, thus improving the quality of life.
METHODS: Harmonious face index is an effective criterion in assessing the surgery’s outcome. In this study was conducted on 30 patients at Hanoi National Hospital of Odontostomatology, Viet Duc Hospital, and Hong Ngoc Hospital from April 2017 to April 2018, and it was a quasi-experimental study with self-comparison, 12 months follow up.
RESULTS: Orthognathic surgery effectively corrected malocclusion crossbite, dental compensation, and helped to improve facial aesthetics. 100% of patients had the quality of life improved, good quality of life consisted of 86.7%. In comparison with a harmonious facial index of Kinh ethnic in Vietnam, 70% of patients achieved skeletal harmony, 63.3% of patients achieved dental harmony, 80% achieved soft tissue harmony.
CONCLUSIONS: Vietnamese harmonious facial index should be used in planning and pre-surgical simulation
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