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Free Practice Questions for EUC-EO

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Key Facts: EUC-EO Exam

100 + 20

Scored items plus unscored pilot items

Ceneval, EUC-EO page

4 hours

Length of the single exam session

Ceneval, EUC-EO page

3

Areas: Prevención, Diagnóstico and Tratamiento

AMO / Ceneval, Guía para el sustentante EUC-EO

22 Oct 2026

Date of the AMO's 2026 certification exam

AMO, Certificación page

MXN 6,850

2026 exam fee for AMO members (MXN 10,850 for non-members)

AMO, Certificación page

EUC-EO is the AMO and Ceneval orthodontics certification exam: 120 Spanish four-option items (100 scored) in one 4-hour session, covering prevention, diagnosis and treatment.

Sample EUC-EO Practice Questions

Try these sample questions to review concepts for the EUC-EO exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1A 13-year-old is about to start treatment with fixed appliances. Which home oral-hygiene routine is most appropriate?
A.Brush once a day at night and use a whitening toothpaste to prevent stains
B.Avoid brushing around the brackets for the first months to prevent debonding
C.Brush after meals with fluoride toothpaste, use interdental brushes and a daily fluoride rinse
D.Replace toothbrushing with a chlorhexidine mouthrinse twice a day while the brackets are on
Explanation: Brackets and wires trap plaque. Brushing after meals with fluoride toothpaste, interdental or orthodontic brushes around the brackets and a daily fluoride mouthrinse reduce white spot lesions and gingivitis. NOM-013-SSA2-2015 promotes brushing after every meal with fluoride toothpaste and the use of interdental aids and home fluoride rinses.
2In patients with fixed appliances, where do white spot lesions most often appear?
A.Labial enamel gingival to the bracket, often on maxillary lateral incisors
B.On the occlusal surfaces of the second molars, which are often left unbonded
C.On the lingual surfaces of the mandibular incisors, next to the tongue
D.Directly under the bracket base, where the adhesive covers the enamel
Explanation: Plaque builds up on the labial surface between the bracket and the gingival margin, where cleaning is hardest. Maxillary lateral incisors are among the most frequently affected teeth, along with canines and premolars.
3At debonding, a patient has several active, non-cavitated white spot lesions. What is the most appropriate initial management?
A.Immediate microabrasion of all the lesions at the debonding appointment
B.Plaque control and a period of remineralization with low-concentration fluoride
C.Composite restorations on every lesion to stop further demineralization
D.No action, since all such lesions disappear within a few weeks unaided
Explanation: Once the appliance is removed, saliva and good plaque control allow active lesions to remineralize, supported by low-concentration fluoride or CPP-ACP. Lesions that remain unsightly after several months can be treated with resin infiltration or microabrasion.
4Six months into fixed-appliance treatment, a patient has swollen, bleeding gingiva around the anterior brackets and visible plaque. What is the first step?
A.Remove all the appliances permanently and end treatment
B.Refer the patient at once to a periodontist for gingivectomy surgery
C.Prescribe systemic antibiotics for two weeks
D.Reinforce hygiene instruction and provide professional cleaning
Explanation: Gingival enlargement during fixed treatment is mostly plaque-induced inflammation. Reinforced hygiene instruction, professional prophylaxis and follow-up usually control it; surgery is considered only for fibrotic enlargement that persists.
5Which of these is a local, rather than a general, etiologic factor of malocclusion?
A.An inherited skeletal pattern
B.Premature loss of a primary molar
C.An endocrine disorder in childhood
D.A congenital craniofacial syndrome
Explanation: Local factors act directly in the dental arches: premature loss or prolonged retention of primary teeth, supernumerary or missing teeth, ankylosis and similar problems. General factors include heredity, congenital syndromes and systemic or endocrine conditions.
6Which actions does NOM-013-SSA2-2015 set for the prevention and control of malocclusions?
A.Routine fitting of removable orthodontic appliances for every child at age 6
B.Extraction of all primary canines at age 8 to guide the eruption of the permanent teeth
C.Guidance on harmful oral habits, follow-up of eruption and referral when needed
D.Annual lateral cephalometric radiographs for every child of school age
Explanation: Section 7.8 of NOM-013-SSA2-2015 calls for guiding the population on detecting and controlling harmful oral habits, following the eruption and integrity of the primary and permanent dentitions to maintain arch dimensions and relationships, and referring cases that need specialized care.
7Which pattern of dental changes is typical of a persistent thumb-sucking habit?
A.Anterior open bite, proclined upper incisors and a narrow maxillary arch
B.Deep bite with retroclined upper incisors and a wide, square maxillary arch
C.Anterior crossbite with proclined lower incisors and spacing
D.Generalized attrition of the molars with a flat curve of Spee
Explanation: Prolonged thumb sucking typically causes an anterior open bite, labial tipping of the upper incisors, lingual tipping of the lower incisors and increased overjet. Cheek pressure and a low tongue posture narrow the maxilla, which may produce a posterior crossbite.
8According to the equilibrium theory described by Proffit, what matters most for a sucking habit to move teeth?
A.The force applied, even if it is brief and occasional
B.The age at which the habit first started
C.The type of finger or object that is sucked
D.Its duration: about 6 hours a day or more
Explanation: Light forces maintained for long periods move teeth; brief forces do not, even if heavy. Habits sustained for about 6 hours a day or more, especially during sleep, are the ones that produce significant malocclusion.
9An 8-year-old wants to stop sucking her thumb, which she does mainly at night. What is the appropriate first approach?
A.A fixed palatal crib with spurs placed at the first visit
B.Counseling with reminders and positive reinforcement
C.Bitter nail polish and a punishment for each episode
D.Waiting until all the permanent teeth have erupted
Explanation: When the child is willing, behavioral measures are tried first: explanation, reminders such as a glove or bandage at night, and a reward calendar. A habit appliance such as a palatal crib is added if these fail, and it is presented as a reminder, not a punishment.
10A 10-year-old has an anterior open bite and places the tongue between the incisors when swallowing. Which measure is most appropriate in addition to correcting the open bite?
A.Frenectomy of the lingual frenum in every case
B.Extraction of the lower incisors to make room for the tongue
C.Myofunctional therapy to retrain tongue posture and swallowing
D.A chin cup worn at night to keep the mouth closed during sleep hours
Explanation: A persistent tongue thrust is addressed with myofunctional therapy, sometimes with a tongue crib or spurs, so that tongue posture and swallowing support the corrected incisor position and relapse is reduced.

About the EUC-EO Exam

Independent EUC-EO practice by OpenExamPrep. The official exam is a Spanish-language, 120-item four-option test (100 scored and 20 pilot items) that forms part of the Asociación Mexicana de Ortodoncia (AMO) professional certification, with Ceneval as independent evaluator. It covers the Prevención, Diagnóstico and Tratamiento areas. This bank is an English-language study adaptation with four-option multiple-choice questions, not an official translation or a simulation of the full exam.

Exam sponsor: AMO and Ceneval. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

120 four-option multiple-choice items (100 scored and 20 pilot) in three areas: Prevención (oral health promotion, harmful habits, limiting damage), Diagnóstico (clinical history, auxiliary studies, establishing the diagnosis) and Tratamiento (plan, execution and evaluation). Items per area are not published.

Time Limit

One 4-hour session

Passing Score

Two performance levels reported by Ceneval to the AMO, which decides whether this certification requirement is met; experience is evaluated separately by the AMO

Exam / Certification Fees

MXN 6,850 (AMO members) or MXN 10,850 (non-members) for the 2026 exam, plus MXN 1,500 to issue the certificate

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

Official area (items per area not published)

Prevención

Oral hygiene with appliances, etiology and signs of malocclusion, harmful oral habits, space maintenance and interceptive measures

Official area (items per area not published)

Diagnóstico

Clinical history, facial and intraoral examination, radiographic and cephalometric analysis, cast analysis and interconsultation

Official area (items per area not published)

Tratamiento

Treatment objectives and biomechanics, alignment and leveling, space closure, torque, orthopedic and functional appliances, aligners, retention and relapse

Preparing for the EUC-EO Exam

What You Need to Know

  • Passing score: Two performance levels reported by Ceneval to the AMO, which decides whether this certification requirement is met; experience is evaluated separately by the AMO
  • Assessment: 120 four-option multiple-choice items (100 scored and 20 pilot) in three areas: Prevención (oral health promotion, harmful habits, limiting damage), Diagnóstico (clinical history, auxiliary studies, establishing the diagnosis) and Tratamiento (plan, execution and evaluation). Items per area are not published.
  • Time limit: One 4-hour session
  • Exam / certification fees: MXN 6,850 (AMO members) or MXN 10,850 (non-members) for the 2026 exam, plus MXN 1,500 to issue the certificate Official sources

Using Our Practice Resources

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

EUC-EO: Suggested Study Strategy

1Organize your review by the three official areas and their subareas in the AMO guide: prevention, diagnosis and treatment.
2Practice interpreting cephalometric values (ANB, Wits, Steiner, McNamara, Tweed, Jarabak) and cast analyses (Bolton, Tanaka-Johnston, space analysis) with numbers.
3Review interceptive care: harmful habits, space maintainers, palatally displaced canines, anterior and posterior crossbites and serial extraction.
4Study the moment-to-force ratio, centers of resistance and rotation, anchorage and the effects of headgear, facemask and functional appliances.
5Review retention and relapse: fiber remodeling times, retainer choice, fiberotomy and intercanine width stability.

Frequently Asked Questions

What is the EUC-EO?

The Examen Único para la Certificación Profesional de la Especialidad en Ortodoncia is prepared and applied jointly by the Asociación Mexicana de Ortodoncia, Colegio de Ortodoncistas (AMO) and Ceneval, acting as independent evaluator. Passing it is one of the requirements for AMO professional certification; the AMO evaluates experience separately.

Who can take it?

Orthodontists with a degree and professional license who apply voluntarily for AMO certification. Students in the last semester of the orthodontics specialty or master's degree may take it if the AMO requests it.

How is the exam structured?

It has 100 scored four-option multiple-choice items plus 20 unscored pilot items, applied in one 4-hour session on paper, online or from home. The areas are Prevención, Diagnóstico and Tratamiento, based on NOM-013-SSA2-2015. Ceneval does not publish how many items each area has.

When is the 2026 exam and how much does it cost?

The AMO lists registration from 29 July to 24 September 2026 and the exam on 22 October 2026 from 9:00 to 13:00. The fee is MXN 6,850 for AMO members and MXN 10,850 for non-members, and issuing the certificate after passing costs MXN 1,500 plus shipping.

Why is this practice bank in English?

The official EUC-EO is in Spanish. This bank is an independent English-language study adaptation with four-option multiple-choice questions organized by the official areas; it is not an official translation or a simulation of the full exam.