Page 139 - 7. FINAL draft Compendium 2019 2020_22072022

TOOTH SURVIVAL FOLLOWING EXTRA-CORONAL RESTORATION IN KEDAH: ROLES OF
CROWN-TO-ROOT RATIO AND OTHER CLINICAL FACTORS
NMRR-19-2157-49311

Tiew EC, Saridatun NAS, Chan HK, Yeong SK

Introduction: The lifespan of extra-coronal restoration is relatively limited as compared
with some direct restoration, and is likely to be influenced by multiple factors, such as the
crown-root ratio (CRR), personal habits and the procedure itself. Objectives: To determine
the tooth survival, as well as the roles of the CRR and other clinical factors, following the
extra-coronal restoration in Kedah. Materials and Methods: This was a cross-sectional
study performed in the Restorative Dentistry Department of a secondary dental care centre
in Kedah. The dental records of patients undergoing extra-coronal restoration in year 2015
were examined. The data collected included their demographic information and medical
history, their oral hygiene status (plaque score), the presence of parafunctional habits, the
type of tooth involved, the pulp and periodontal conditions, and the history of crown
lengthening procedure. Results: A total of 99 cases of extra-coronal restoration were
recorded. Most cases involved anterior tooth (53.53%) and dental crown (39.39%). The
patients were mainly female (76.6%), Malay ethnicity (73.73%) and in the age range of 35-
46 years (25.25%). It was found that 72 cases of extra-coronal restoration (72.72%) survived
at least 4 years following the procedure. A higher CRR (p=0.047; r=-0.20), along with the
presence of parafunctional habits (p<0.001) and a history of preoperative periodontal
treatment (p=0.04) was found to be associated with a longer tooth survival. Conclusion:
The CRR, together with a history of periodontal treatment and parafunctional, is the
important determinant of tooth survival following the extra-coronal restoration.

Status: Publication under Malaysia Dental Journal in progress

Dr Tiew Eng Cheong
Dr Saridatun Nur Binti Abdul Salam
Dr Yeong Shue Kang
Restorative Dental Specialist Unit
Kota Setar Dental Clinic
Alor Setar Kedah
Mr Chan Huan Keat
Clinical Research Centre
Hospital Sultanah Bahiyah
Alor Setar Kedah

117