effect of Primary Surgery of the lip and palate on palatal morphology
in complete unilateral cleft lip and palate children.
Senior Lecturer, Orthodontics
on normal palatal growth of unilateral cleft lip and palate
(UCLP) children is the constrictive effect of surgical scar
tissue on the palatal segments. This study traces the changes
in palatal dimensions of UCLP patients from the time of primary
lip repair to 6 months post-primary closure of the palate using
advanced 3-D laser imaging
resistance in subjects with obstructive sleep apnoea
Wong Dai Chong
purpose of this study is to compare nasal resistance of obstructive
sleep apnoea patients with those of normal healthy adults. Nasal
resistance is measured by means of rhinomanometry, a non-invasive
procedure which records the change in pressure and the rate
of airflow across the nose.
axis inclination changes of impacted third molars during orthodontic
Visiting Resident, Orthodontics
study comprises the evaluation of the inclination of impacted
third molars prior to orthodontic treatment (T1) compared with
the post-treatment results (T2) in a sample of 60 Asian orthodontics
patients treated at the Faculty of Dentistry. The angulation
measurements were taken from OPGs at T1 and T2 supplemented
by linear measurements of the study casts. The different factors
influencing the prognosis of thrid molars are discussed.
and Soft tissue Morphology inpatients with increased overjet
aims of this study were to measure the Chinese dentofacial and
soft tissue morphological differences between a sample of patients
(N=30) with an overjet of >6mm (Class II Divisional) when
compared to a control group (N=47) with normal overjet. Pre-
and post-treatment changes were also assessed. For subjects
with increased overjet, differences included increased maxillary
incisor proclination, overjet and overbite, increased saggital
soft tissue discrepancy (p<0.001) and upper lip prominence
(p<0.01). Changes due to treatment showed a significant normalisation
in these same variables (p<0.0001).
resistance and craniofacial morphology in Indian subjects with
obstructive sleep apnoea
Wong Mei Ling
present study investigates the relationship between craniofacial
form and airway dimension in an Indian cohort of patients with
obstructive sleep apnoea, using natural head posture cephalometry
and rhinomanometry to assist in diagnosis and management.
morphology and head posture in patients with difficult intubation
Koh Kwong Fah
Associate Professor and Consultant
intubation is a common procedure performed during general anaethesia.
Difficulty in intubation although not common carries with it
significant morbidity and mortality. It would be useful to be
able to predict which patients will be difficult to intubate.
However, there have been a few reliable predictors. The aim
of our study is to compare a group of patients known to be difficult
with a control group, looking into their craniofacial morphology
as well as their natural head posture. It is hoped that this
will enable us to understand some of the mechanisms contributing
to difficulty in intubation and as a result, formulate reliable
predictors to identify this group of patients.
Patient Centered Evaluation of Orthodontic Clinical Care
Wong Tuck Yong
present study aims to investigate the standard of orthodontic
treatment using two indices, Peer Assessment Rating (PAR) index
and Anterior Occlusal Trait (AOT) index to assess patient satisfaction
with treatment results. A sample of patients (N=76) who had
recieved two-arched fixed orthodontic appliance treatment participated
in the study which was carried out using a questionaire. The
results of the study showed that the orthodontic treatment was
accomplished toa very high standard with a great percentage
of patients expressing satisfaction with treatment.
Reference Data for Singaporean Chinese Adults
the introduction of cephalometrics by Broadbent in 1931, the
use of cephalometrics extended from the study of facial form
to the development of cephalometric standards for different
ethenic and population groups. One set of cephalometric standards
cannot be applied to all ethnic and population groups as racial
characteristics may lead to differences in craniofacial morphology.
Previous studies have focused on Caucasians. There are limited
studies on the cephalometric craniofacial morphology of Chinese.
This study aims to provide descriptive statistics on the craniofacial
morphology of Singaporean Chinese adults to aid in the diagnosis,
management and outcome assessment of orthodontic care in Singapore.
of new bone formation following use of allografts and alloplasts
in bony defects adjacent to implants
Chong Lai Leong
aim of the study was to show the possibility of generating bone
beyond the skeletal envelope using a non-porous barrier membrane.
Implants beyond the outer cortical border of rabbit tibia and
test sites covered with a membrane. Results showed significant
amount of bone generation around test implants when compared
with controls, thus verifying the role of a barrier membrane
in guided bone generation.
Dimension and Natural Head Posture in subjects with Obstructive
Ang Poh Kang
is currently little information on the role of upper airway
abnormalities in Chinese. The study proposes, using lateral
cephalograms, to determine the airway dimension and natural
head posture in Chinese subjects with mild and moderately severe
obstructive sleep apnoea in Singapore. Findings may be used
to assist in diagnosis and management of obstructive sleep apnoea.
Investigation of Permenant Dentition crown morphology in an
Ethnic Chinese using Laser Scanning
Kwek Meau Charm
studies have been conducted ontooth measurements since the
era of G V Black (1902). Conventionally teeth sizes are measured
manually with sliding caliper, micrometer screw gauge, digitized
calipers and digital micrometer. These forms of dental cast
analysis based on two-dimensional contact measurement of teeth
sizes incorporate many errors. It is the purpose of this study
to investigate the permenant crown morphology based on study
models using laser surface scanning. The fit of existing bracket
system on the labial or buccal surfaces teeth is further determined.
of heating on the mechanical properties of restorative casting
alloys and their investments
Chew Chong Lin
Professor, Restorative Dentistry
purpose of this project is to study the mechanical properties
of metal ceramic alloys and dental investments at high temperatures.
Five commonly used metal ceramic alloys and three dental investments
were selected for this study. The results from this project
would provide insight into development of future dental alloys
of composite resins occlusal contact area wear
Asst Professor, Restorative Dentistry
anticipation of using composite resins as an alternative for
amalgam restorations, this project focuses on the problem of
composite wear in stress-bearing areas. The study employs a
scientific approach in which the variables of influence, including
the effects of load, food-stimulating liquids and abrader materials,
are separated and investigated using the BIOMAT-DIII wear simulator.
The goal is to define degradation mechanisms of dental composite
restoratives in occlusal contact area wear.
of particle-reinforcement on the physio-mechanical properties
of resin-modified glass ionomer cements?
the physio-mechanical properties of resin-modified glass-ionomers
(RMGIC) are superior to their conventional counterparts, they
are still lower than that of composite restoratives. This study
investigates the effects of particle-reinforcement on the physio-mechanical
properties of RMGIC including hardness, flexural and compressive
strengths. The porperties of these new experimental RMGIC were
compared with RMGIC at varying power:liquid ratios.