microleai(age of bonded

MICROLEAI(AGE OF BONDED AMALGAM RESTORATIONS

BY YOUSRA r{. AL-JAZATRY, B.D.S

A Thesis

Submitted to the facul ty oÍ Graduate Studies in Partial Fulfillment of the Requirements for the Degree of

IIIASTER of SCIENCE Department of Restorative Dentistry

Universi$ oÍ Manitoba Winnipeg Manitoba

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October,L995

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}IICROLEAKAGE OF BONDED AI.ÍALGA}T RESTORATIONS

BY

YOUSRA

E. AL-JAZAIRY

A Thesis submitted to the Faculty of Graduate Studies of the University of Manitoba in partial fulfillment of the requirements of the degree of HASTER OF SCIENCE

@ L996

Perrrission has been granted to the LIBRARY OF THE UNMRSITY OF MANIIOBA to lend or sell copies of this thesis, to the NATIONAL LIBRARY OF CANADA to microfilm this thesis and to lend or sell copies of the film, and LIBRARY MICROFILMS to publish an abstract of this thesis.

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DEDICATION

To my Parents

Hussøin øndNajøt Whose loae, aalues and guidance made me what

To my husband

Sølim and

My lovely children Sømø, Abdul-Rhmøn, ønd Hølø For theír loae, patience and support.

I

am..

ACKNOWLEDGMENTS Foremost among my acknowledgments,

I am very grateful to God the

most compassionate and most merciful for giving me the will and ability to accomplish my goals, and providing me all helpful people who made this thesis possible.

My years at University of Manitoba/Winnipeg have been particularly rewarding, during which time I feel that

I have grown both personally and

professionally. No one reached this point

in

education without the help

from several people. First, I would like to thank my thesis advisor Dr. Amazis Louka whom

I admire and respect. His stages

guidance and continuous encouragement during all

of my master's thesis preparation was indispensable to its successful

completion. I will be always be his sincere student.

I am especially indebted to:

Dr. Peter williams, whose knowledge, insight, advice, and assistance was beyond expression.

Dr. Howard Fogel, for his technical help and superb research skills. Dr. George Bowden, for his Knowledge and critical review. Dr. Olva Odlum, for her invaluable guidance, friendship, time and emotional support through out my stay in Manitoba. She

will

be always an example for

an academic teacher in the truest sense of the word.

Mrs Mery cheang, for her advice and assistance in the statistical section.

u

I extend my thanks to the staff of the Restorative Dentistry Department for their friendship and support.

A

special thanks goes to my family, for

their endless support

and

prayers. For my parents, for their love and believe in what I can achieve both in my social and scientific life. For my sisters and brothers who never let me feel the miles between us.

I would like to express my thanks to King

Saud University/Saudi

Arabia for the scholarship which supported me in my studies at U.M. and to the Cultural Mission of Saud,i Arabia/Canada. Lastly, but most importantly, encouraged me through

I want to thank my husband, who has

out all my studies. Without his patience, support

and understanding this work would not have been possible.

lll

ABSTRACT Microleakage at the amalgam restoration-dentin interface has been a major area of concern for many years. Currently, adhesive dentin bonding systems are

used to bond and seal amalgam restorations to tooth structure. The purpose of this study was to evaluate quantitatively the effectiveness of two adhesive dentin

bonding systems on reducing microleakage at the amalgam-dentin interface in comparison to the presently most used amalgam restoration sealing material Copalite varnish. Cylindrical occlusal cavities, 3 mm diameter and 3 mm depth, were prepared

in 24 freshly extracted human third molars.

Six samples were

randomly assigned to each of the four following groups: unlined amalgam (UN), Copalite varnish (CO), and Amalgambond Plus (AM), All-Bond 2 (AL) adhesive systems.

A fluid-under-pressure

each tooth was used

apparatus connected

with the pulp chamber of

to evaluate the permeability and marginal leakage of teeth

before and after restorations at L6 Psi pressure. Following insertion

of

the

amalgam restorations, microleakage (pl/min/cm HZO) was measured at 24hrs, week, and

1,,

3, 6 months. Data were analyzed by repeated measures

ANOVA and

showed a significant difference among the means of the groups (p