Stress management in dental students: a systematic review

Abstract

This study compared the effectiveness of stress management programs in dental education by systematic review of the literature. The number of studies concerning stress management programs for dental students is limited compared with studies discussing sources of stress. Several types of programs for stress management have been reported, and differ in their duration, content, and outcomes. Two main strategies have been used to help stressed students, ie, decreasing the number of stressors and increasing the ability to cope with stress. The first strategy includes several components, such as reducing fear of failure and workload pressure due to examinations and requirements. The second strategy includes coping techniques, such as deep breathing exercises. Although positive effects have been reported for most of the programs, these have mainly been evaluated using subjective self-report measures. There is a need for more research to identify the most effective stress management program.

Introduction

Dental students have a 100% prevalence of stress.¹ Perception of stress is due to the tendency of dental students toward perfectionism based on their history of high achievement and excellence in previous schooling and the fact that excellence is the norm in dental school.² The effect of year of study on stress levels has been found to be significant, with the third year of the 5-year curriculum considered the most stressful.³ Increasing stress may result in decreased student performance.⁴ Stress can be a significant threat and have a detrimental effect on the physical and/or mental health of students.⁵ Stress may also harm the trainee’s professional effectiveness by decreasing attention, reducing concentration, impinging on decision-making skills, and reducing the ability to forge good clinician-patient relationships.⁶

In relation to the serious side effects of stress among students in the health professions, more than two decades ago Tisdelle et al reported the deficiency in stress management research and programs available for dental students.⁷ This observation has not been adequately addressed, despite numerous reports of the negative consequences of stress and recommendations to develop stress management programs for intervention and prevention. Although there is a large body of literature on stress management, its specific application to dental education has been largely unexplored. Compared with studies reporting the sources of stress, the number of studies discussing the prevention or management of stress in dental education is limited. However, a few researchers have studied the specific effects of stress management programs in dental education and some have provided empirical data.

Thirty-eight sources of stress in five groupings have been identified, being stressors related to living accommodation, stressors related to personal factors, stressors related to educational environment, stressors related to academic work, and stressors related to clinical factors.⁵ Prevention and intervention procedures have been classified in six categories.⁵ Apart from these, one study done in India recommends that parents should be advised not to force their children to study something against their will,⁸ because they found that fear of facing parents after failure is a major source of stress, particularly in that part of the world.

Summarizing the literature, stressed students can help by either decreasing the number of stressors or by increasing their coping skills with regard to stress.⁹ Decreasing the number of stressors can be achieved in several ways, such as reducing fear of failure and workload pressure due to examinations and course requirements.⁹ In addition, the content of the dental curriculum could be reduced or its design changed.¹⁰ Clinical requirements can be reduced or deleted to decrease the number of stressors.⁹ Dodge et al found lower levels of stress among students in a clinical program based on patient needs than in students in a clinical program based on requirements. Further, students in programs without requirements have higher productivity and academic performance.¹¹ Increasing the length of the curriculum in order to lower students’ workload can help, and may also reduce their fear of failure.⁹ Stress caused by uncertainty during transition periods can be reduced by scheduling sessions for exchange of information between students and their classmates from one year ahead, which can be a good source of information for their juniors.^9,12

Increasing students’ ability to cope with stress is also important, and may help them in their future professional activities. Kay and Lowe suggest implementing stress management and wellness courses for students.¹³ Topics such as coping with stress, time management, and choosing realistic goals could be addressed. Moreover, overall wellness should be emphasized by discussing the importance of sleep, diet, exercise, and other stress relievers like yoga and meditation. Positive outcomes have been observed among dental and medical students in previous studies.^14–17

The purpose of the present study was to systematically review the literature to identify stress management programs in dental education and to determine their effectiveness. We focused on programs that provided students with coping techniques, such as meditation, hypnosis, imagery, and muscle relaxation, education regarding the psychological and physiological effects of stress, affiliation with peers, opportunities for emotional expression (support groups), and intensified relationships with faculty. After review of the literature, we discuss the implications of integration of stress management into dental education, provide practical suggestions for decreasing and alleviating stress, and make suggestions for future research.

Methods

This systematic review was conducted after approval of the protocol by the institutional review board at the King Abdullah International Medical Research Center. Two reviewers (AMA, AHA) evaluated studies on stress management in dental students for inclusion. The aim of the evaluation was to assess the quality of the studies as objectively as possible. Assessment of quality included the study design, sampling (size and technique), the outcomes measured, and the reliability and accuracy of the data. The authors assessed the rigor of the selected studies according to the availability and quality of the study design, study sampling, response rate, measurement tool, and stress management program.

Selection of studies

The literature search primarily involved a search of PubMed (NLM), Library of Congress, LISTA (EBESCO), and Web of Science (TS). The key words used in our literature search were “dental”, “dentistry”, “education”, “management”, “stress”, and “students”. To narrow our search, the key words were combined by using AND as follows: “dental students stress management”, dental AND students AND stress AND management, dental AND undergraduates AND stress AND management, dental AND students AND stress, dental AND undergraduates AND stress, dental AND education AND stress, dental AND education AND stress AND management, dentistry AND stress AND management. The reference lists of retrieved articles were also checked. Further, experts in stress management and behavioral psychology were contacted and asked about stress management programs for students. The citations identified in the electronic search were downloaded into EndNote X2, while those retrieved from other sources were entered manually (eg, hand searching, reference lists). Duplicates were deleted and a unique identification was assigned to each citation (author name and year of publication) on the review form.

A review form was designed (see Figure S1) to help determine which papers should be included in the study. A paper was included if it was published in the English language between January 1966 and November 2013, included undergraduate dental students, and investigated or discussed any stress management program. When the information provided by the title and abstracts was found to be relevant to the present research, or when this information was insufficient to decide on inclusion, the full text article was retrieved and evaluated. All remaining articles were read in their entirety and a final selection was made.

Data were extracted from the selected studies using a data extraction form (see Figure S2). The data extraction form included questions organized in three categories: general information (primary author, year of publication, country, journal); specific information (study design, study sample, stress management program); and analysis of outcomes (prevention, intervention). The review and data extraction forms were tested in a pilot study of a small number of papers. Based on the findings of the pilot, the forms were revised prior to use for identification of the articles included in the present study.

Procedure

The two reviewers (AMA, AHA) reviewed all the articles; the primary investigator was a consultant in dental services, program director, and a PhD student in a medical education program, and the other was a dental consultant interested in stress among dental professionals and students. The reviewers used the review and data extraction forms, and in case of a difference of opinion between the two reviewers, an expert was consulted to resolve the matter.

Data analysis

The results of the selected studies were combined and the findings reported most frequently were identified and summarized in tables. Aspects of stress management were categorized according to whether they were prevention or intervention programs. The results of all the papers included were reviewed to identify duplicate data, and a table was developed that included all aspects of stress management.

Results

Most of the literature addressing stress in dental students focused on the sources of stress and factors influencing the level of stress, such as gender and other demographic variables. Despite the call for stress management among dental students, only a small number of articles were found that discussed programs for managing these stressors in undergraduate dental students.

The initial electronic search by key words revealed 89 papers; after excluding duplicates and irrelevant papers by review of titles, this number was reduced to 22 (Figure 1). The reviewers went through these 22 papers by reading the abstract, and after checking if the papers measured the effects of stress management programs in dental students, the number of papers was reduced further to 14. After reading the full text of these 14 papers, more papers were excluded according to the selection criteria, finally leaving seven papers for analysis (see Table S1).

Figure 1.

Articles screened for review.

Four of the studies selected were controlled trials,^18–20 the fifth was a cross-sectional survey, the sixth was a case report, and the seventh was a systematic review addressing stress in dental students.^1,5,21 The selected studies discussed different stress management programs, ranging from a short program to (one 60-minute session) a rather intensive program (60–90-minute sessions). Five of the selected studies reported intervention programs for stress management and the other two reported prevention programs.^1,5,18–21 For six of the seven programs, the authors reported significant effects on stress reduction; however, no significant effect was found in one study.¹⁸

The stress management programs used varied in type, in that there were programs that trained students in specific relaxation strategies or techniques (ie, deep breathing, progressive muscle relaxation, Synchro-Energizer, yoga),^1,18,19,20 other programs that introduced an interpersonal approach to dentistry (ie, faculty advising system, counseling system, study and test-taking skills program, stress management workshop),²¹ and another program using multiple stress management seminars.⁷

Outcomes of the stress management programs were measured using multiple measurement tools including the Visual Analog Scale,^18,19 Spielberger State-Trait Anxiety Inventory,^18–20 COPE questionnaire,¹⁸ Dental Environment Stress questionnaire,¹ Expectancy,⁷ Stress Knowledge Inventory,⁷ Profile of Mood States,²⁰ Observer Rating Inventory,²⁰ and Thurstone Temperament Schedule and Stanford Stress questionnaire.²⁰

The variety of the stress management programs (Table 1) indicated that there are as yet no gold standards for the duration of such programs or the tools that can be used to assess their outcome. There are no stress management programs that deal with all sources of stress known from the literature.

Table 1.

Summary of selected studies

Reference	Year	Study sample	Study design	Outcomes measurement	Effectiveness
Shankarapillai et al19	2012	100 students	Controlled trial	VAS, STAI	Significant stress reduction
Alzahem et al5	2011	49 articles	Systematic review	Data collection form	Not applicable
Ahmad et al1	2011	291 students	Cross-sectional	DES questionnaire	90.3% stress reduction
Piazza-Waggoner et al18	2003	26 students	Controlled trial	VAS, STAI, COPE questionnaire	No significant effect
Howard et al20	1986	23 students	Controlled trial	PMS, STAI, ORI, symptoms questionnaire	Stressed students benefited the most
Schwartz et al21	1984	Dental students	Case report	Not available	Not available
Tisdelle et al7	1984	17 students	Controlled trial	Stress Knowledge Inventory, STAI, Symptom Checklist, physiological assessment	Effective in reducing dental students’ physiological and self-reported stress levels

Abbreviations: DES, Dental Environment Stress; VAS, visual analog scale; STAI, Spielberger State-Trait Anxiety Inventory; COPE, Coping Orientation for Problem Experiences; PMS, Profile of Mood States; ORI, Observer Rating Inventory.

Discussion

The aim of this study was to identify stress management programs in dental education, and to determine their effectiveness. To this end, we undertook a systematic review of the literature. Seven articles were selected and reviewed, but only four showed significant stress reduction using the suggested stress management programs. In almost all programs, the participants found them useful.

The number of studies discussing the content and effectiveness of stress management programs for dental students is limited, compared with studies discussing the sources of stress among dental students. The stress management programs reported in the literature for medical students were also limited, and included self-hypnosis, meditation, mindfulness-based stress reduction, changes in the “pass/fail” grading system, feedback on various health habits, educational discussion, and changes in the length and type of curriculum provided.²² There were other studies discussing stress management programs, but these do not focus on dental students specifically. Online stress management programs are effective if participants enjoy these, and have been shown to be more easily accessible and more cost-effective than traditional programs.^23–25 Cognitive-behavioral stress management programs have been shown to be effective in reducing dysfunctional thought and decreasing stress.^26,27 These general observations regarding stress management programs could be used to design programs specifically for dental students.

Different types of programs addressing stress management in dental students have been reported, but differ in their duration, content, and effect. These programs are either single or multiple sessions and contain relaxation techniques or information about stress. The shortest stress management program was a one-hour session, while the longest consisted of six 60–90-minute sessions. The stress management programs reported either helped to reduce the number of stressors or enhance stress coping skills, using relaxation techniques such as deep breathing and yoga. Stress management programs focused on stress prevention attempted to decrease the impact of stressors through stress awareness lectures.

The reported stress management programs did not follow one concept, and used either one measure or a combination of measures. For instance, some studies suggested improvement of the inter-professional relationship skills to reduce stress among dental students or used yoga; and the other studies used the Synchro-Energizer and Progressive Muscle Relaxation techniques, or combination of awareness and stress reduction exercise in multiple sessions. Most of these programs were liked by the students, helped them to manage their stress, and do not follow a gold standard. Hence, we recommend a program with easy application for students and dental schools, where students can achieve high outcomes with the least expenditure of time and effort.

The huge impact of stress on dental students indicates a need for stress management programs in dental education. Such programs could be introduced in dental curricula; for example, by recruiting a clinical psychologist for dental students in dental schools. Based on our review, the following considerations should be incorporated into future research: rigorous study design, including randomized controlled trials; more detailed study of varying durations and frequencies of interventions (eg, single-session versus multiple-session programs); more objective outcome measures than self-reports; and the effects seen on long-term follow-up.

A limitation of this research might be the small number of studies selected for review. Therefore, future studies are needed to study the effectiveness of stress management programs for dental students.

This review highlights the importance of stress management programs, the promising start made by those already implemented and investigated, and the unexplored territory that must be charted if these interventions are to efficiently and effectively succeed in the twin goals of benefiting future dentists and their patients and establishing a sound scientific base for future research.

Supplementary material

Figure S1

Study review form.

Figure S2

Data extraction form.

Table S1.

Reference checklist

		Title	Abstract	Full-text	Exclusion reason
1.	Shankarapillai R, Nair MA, George R. The effect of yoga in stress reduction for dental students performing their first periodontal surgery: a randomized controlled study. Int J Yoga. 2012;5(1):48–51.
2.	Divaris K, Polychronopoulou A, Taoufik K, Katsaros C, Eliades T. Stress and burnout in postgraduate dental education. Eur J Dent Educ. 2012;16(1):35–42.	X			Not on undergraduate students
3.	Ahmad MS, Md Yusoff MM, Abdul Razak I. Stress and its relief among undergraduate dental students in Malaysia. Southeast Asian J Trop Med Public Health. 2012;42(4):996–1004.
4.	Tangade PS, Mathur A, Gupta R, Chaudhary S. Assessment of stress level among dental school students: an Indian outlook. Dent Res J (Isfahan). 2011;8(2):95–101.	X			No management program
5.	Pani SC, Al Askar AM, Al Mohrij SI, Al Ohali TA. Evaluation of stress in final-year Saudi dental students using salivary cortisol as a biomarker. J Dent Educ. 2011;75(3):377–384.	X			No management program
6.	Jurkat H, Hofer S, Richter L, Cramer M, Vetter A. [Quality of life, stress management and health promotion in medical and dental students. A comparative study]. Dtsch Med Wochenschr. 2011;136(23):1245–1250. German.		X		No management program
7.	Huth KC, Chen HY, Mehl A, Hickel R, Manhart J. Clinical study of indirect composite resin inlays in posterior stress-bearing cavities placed by dental students: results after 4 years. J Dent. 2011;39(7):478–488.	X			Not related to students stress management
8.	Alzahem AM, van der Molen HT, Alaujan AH, Schmidt HG, Zamakhshary MH. Stress amongst dental students: a systematic review. Eur J Dent Educ. 2011;15(1):8–18.
9.	Abu-Ghazaleh SB, Rajab LD, Sonbol HN. Psychological stress among dental students at the University of Jordan. J Dent Educ. 2011;75(8):1107–1114.		X		No management program
10.	Silverstein ST, Kritz-Silverstein D. A longitudinal study of stress in first-year dental students. J Dent Educ. 2010;74(8):836–848.		X		No management program
11.	Polychronopoulou A, Divaris K. A longitudinal study of Greek dental students’ perceived sources of stress. J Dent Educ. 2010;74(5):524–530.	X			No management program
12.	Manhart J, Chen HY, Mehl A, Hickel R. Clinical study of indirect composite resin inlays in posterior stress-bearing preparations placed by dental students: results after 6 months and 1, 2, and 3 years. Quintessence Int. 2010;41(5):399–410.	X			Not related to students’ stress management
13.	Hinshaw KJ, Richter LT, Kramer GA. Stress, burnout, and renewal activities of dental hygiene education administrators in six US Midwestern States. J Dent Educ. 2010;74(3):235–250.	X			Not related to dental students
14.	Dahan H, Bedos C. A typology of dental students according to their experience of stress: a qualitative study. J Dent Educ. 2010;74(2):95–103.			X	No management. Former students
15.	Polychronopoulou A, Divaris K. Dental students’ perceived sources of stress: a multi-country study. J Dent Educ. 2009;73(5):631–639.	X			No management program
16.	Peker I, Alkurt MT, Usta MG, Turkbay T. The evaluation of perceived sources of stress and stress levels among Turkish dental students. Int Dent J. 2009;59(2):103–111.	X			No management program
17.	Laurence B, Williams C, Eiland D. Depressive symptoms, stress, and social support among dental students at a historically black college and university. J Am Coll Health. 2009;58(1):56–63.	X			No management program
18.	Kumar S, Dagli RJ, Mathur A, Jain M, Prabu D, Kulkarni S. Perceived sources of stress amongst Indian dental students. Eur J Dent Educ. 2009;13(1):39–45.	X			No management program
19.	Schmitter M, Liedl M, Beck J, Rammelsberg P. Chronic stress in medical and dental education. Med Teach. 2008;30(1):97–99.		X		No management program
20.	Muirhead V, Locker D. Canadian dental students’ perceptions of stress and social support. Eur J Dent Educ. 2008;12(3):144–148.		X		No management program
21.	Gorter R, Freeman R, Hammen S, Murtomaa H, Blinkhorn A, Humphris G. Psychological stress and health in undergraduate dental students: fifth year outcomes compared with first year baseline results from five European dental schools. Eur J Dent Educ. 2008;12(2):61–68.	X			No management program
22.	Muirhead V, Locker D. Canadian dental students’ perceptions of stress. J Can Dent Assoc. 2007;73(4):323.	X			No management program
23.	Morse Z, Dravo U. Stress levels of dental students at the Fiji School of Medicine. Eur J Dent Educ. 2007;11(2):99–103.	X			No management program
24.	Sofola OO, Jeboda SO. Perceived sources of stress in Nigerian dental students. Eur J Dent Educ. 2006;10(1):20–23.	X			No management program
25.	Sugiura G, Shinada K, Kawaguchi Y. Psychological well-being and perceptions of stress amongst Japanese dental students. Eur J Dent Educ. 2005;9(1):17–25.	X			No management program
26.	Rosli TI, Abdul Rahman R, Abdul Rahman SR, Ramli R. A survey of perceived stress among undergraduate dental students in Universiti Kebangsaan Malaysia. Singapore Dent J. 2005;27(1):17–22.	X			No management program
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28.	Polychronopoulou A, Divaris K. Perceived sources of stress among Greek dental students. J Dent Educ. 2005;69(6):687–692.	X			No management program
29.	Pohlmann K, Jonas I, Ruf S, Harzer W. Stress, burnout and health in the clinical period of dental education. Eur J Dent Educ. 2005;9(2):78–84.		X		No management program
30.	Friedlander AH, Friedlander IK, Marder SR. Posttraumatic stress disorder: psychopathology, medical management, and dental implications. Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2004;97(1):5–11.	X
31.	Cardoso CL, Loureiro SR, Nelson-Filho P. Pediatric dental treatment: manifestations of stress in patients, mothers and dental school students. Braz Oral Res. 2004;18(2):150–155.	X
32.	Piazza-Waggoner CA, Cohen LL, Kohli K, Taylor BK. Stress management for dental students performing their first pediatric restorative procedure. J Dent Educ. 2003;67(5):542–548.
33.	Acharya S. Factors affecting stress among Indian dental students. J Dent Educ. 2003;67(10):1140–1148.	X
34.	Newbury-Birch D, Lowry RJ, Kamali F. The changing patterns of drinking, illicit drug use, stress, anxiety and depression in dental students in a UK dental school: a longitudinal study. Br Dent J. 2002;192(11):646–649.		X
35.	Naidu RS, Adams JS, Simeon D, Persad S. Sources of stress and psychological disturbance among dental students in the West Indies. J Dent Educ. 2002;66(9):1021–1030.	X
36.	Humphris G, Blinkhorn A, Freeman R, et al. Psychological stress in undergraduate dental students: baseline results from seven European dental schools. Eur J Dent Educ. 2002;6(1):22–29.		X
37.	Rajab LD. Perceived sources of stress among dental students at the University of Jordan. J Dent Educ. 2001;65(3):232–241.	X
38.	Sanders AE, Lushington K. Sources of stress for Australian dental students. J Dent Educ. 1999;63(9):688–697.	X
39.	Heath JR, MacFarlane TV, Umar MS. Perceived sources of stress in dental students. Dent Update. 1999;26(3):94–98, 100.	X
40.	Peretz B, Rosenblum A, Zadik D. Stress levels and related variables among dental students in Jerusalem, Israel. Eur J Dent Educ. 1997;1(4):162–166.	X
41.	Newton JT, Baghaienaini F, Goodwin SR, Invest J, Lubbock M, Marouf Saghakhaneh N. Stress in dental school: a survey of students. Dent Update. 1994;21(4):162–164.	X
42.	Hendricks SJ, Joshi A, Crombie K, Moola MH. Perceived sources of stress among black dental students in South Africa. J Dent Educ. 1994;58(6):406–410.	X
43.	Reyes RE. Stress management in pediatric dentistry. N Y State Dent J. 1993;59(2):22–23.		X
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45.	Sgan-Cohen HD. Stress among Israeli dental students: a two-year longitudinal study. Int J Psychosom. 1989;36(1–4):69–71.	X
46.	Rubenstein LK, May TM, Sonn MB, Batts VA. Physical health and stress in entering dental students. J Dent Educ. 1989;53(9):545–547.			X	No management program
47.	Grandy TG, Westerman GH, Combs CE, Turner CH. Perceptions of stress among third-year dental students. J Dent Educ. 1989;53(12):718–721.	X
48.	Sgan-Cohen HD, Lowental U. Sources of stress among Israeli dental students. J Am Coll Health. 1988;36(6):317–321.	X
49.	Grandy TG, Westerman GH, Lupo JV, Combs CG. Stress symptoms among third-year dental students. J Dent Educ. 1988;52(5):245–249.	X
50.	Friedlander AH, Mills MJ, Wittlin BJ. Dental management considerations for the patient with post-traumatic stress disorder. Oral Surg Oral Med Oral Pathol. 1987;63(6):669–673.	X
51.	Cecchini JJ, Friedman N. First-year dental students: relationship between stress and performance. Int J Psychosom. 1987;34(3):17–19.	X
52.	Westerman GH, Grandy TG, Lupo JV, Mitchell RE. Relationship of stress and performance among first-year dental students. J Dent Educ. 1986;50(5):264–267.	X
53.	Register J. Dental students today. Feeling pressure/stress. Fla Dent J. 1986;57(2):6–7,58–59.			X	No management program
54.	Howard CE, Graham LE 2nd, Wycoff SJ. A comparison of methods for reducing stress among dental students. J Dent Educ. 1986;50(9):542–544.
55.	[No authors listed]. Management of stress in the dental practitioner. Dent Clin North Am. 1986;30(Suppl 4):S1–S146.	X			Not on students
56.	Musser LA, Lloyd C. The relationship of marital status and living arrangement to stress among dental students. J Dent Educ. 1985;49(8):573–578.	X
57.	Lloyd C, Musser LA. Stress in dental students. J Am Coll Dent. 1985;52(2):11–19.			X	No management program
58.	Tisdelle DA, Hansen DJ, St Lawrence JS, Brown JC. Stress management training for dental students. J Dent Educ. 1984;48(4):196–202.
59.	Sebor RJ. Stress: inherent to dentists or taught to dental students? Dent Stud. 1984;63(1):14–20.			X	No management program
60.	Schwartz RM, Eigenbrode CR, Cantor O. A comprehensive stress-reduction program for dental students. J Dent Educ. 1984;48(4):203–207.
61.	Ravins H. Dental orthopedics – stress management. Basal Facts. 1984;6(1):30–31.			X	Not study (note)
62.	Grandy TG, Westerman GH, Mitchell RE, Lupo JV. Stress among first-year dental students. J Dent Educ. 1984;48(10):560–562.			X	No management program
63.	Cohen H, Hurwitz M, Lanesman B, Myburg N, Prinsloo B. The perception and response to stress by dental students of the University of Witwatersrand. Diastema. 1982;10:16–21.	X
64.	Garbee WH Jr, Zucker SB, Selby GR. Perceived sources of stress among dental students. J Am Dent Assoc. 1980;100(6):853–857.	X
65.	Goldstein MB. Sources of stress and interpersonal support among first-year dental students. J Dent Educ. 1979;43(12):625–629.			X	No management program
66.	Jackson E, Mealiea WL Jr. Stress management and personal satisfaction in dental practice. Dent Clin North Am. 1977;21(3):559–576.		X
67.	Lobene RR, Fredericks M, Mundy P. The relationship between social class stress – anxiety responses, achievement, and professional attitudes of dental hygiene students. J Am Dent Hyg Assoc. 1972;46(2):113–117.	X
68.	Lobene RR, Fredricks MA, Mundy P. The relationship between social class, stress anxiety responses, academic achievement and professional attitudes of students of dental assisting. Dent Assist. 1971;40(8):11–15.	X
69.	Fredericks MA, Mundy P. Relations between social class, stress-anxiety responses, academic achievement, and professional attitudes of dental students. J Dent Educ. 1969;33(3):377–384.	X
70.	Fredericks MA, Mundy P. Dental students: relationship between social class, stress, achievement, and attitudes. J Am Coll Dent. 1967;34(4):218–228.	X