Severe, localized pathologic attrition on the palatal surfaces of maxillary incisors and the incisal edges of mandibular incisors is most commonly pathognomonic of which specific malocclusion?

 # Severe, localized pathologic attrition on the palatal surfaces of maxillary incisors and the incisal edges of mandibular incisors is most commonly pathognomonic of which specific malocclusion?

A. Severe Anterior Open Bite

B. Class II Division 2 Malocclusion (Deep Bite)

C. Unilateral Posterior Crossbite with functional shift

D. Class I Malocclusion with severe posterior crowding

The correct answer is: B. Class II Division 2 Malocclusion (Deep Bite)

This wear pattern—severe, localized pathologic attrition on the palatal surfaces of the maxillary incisors and the incisal edges of the mandibular incisors—is pathognomonic for Class II Division 2 malocclusion, which features retroclined maxillary central incisors and a deep overbite. In this condition, the mandibular incisors contact the lingual (palatal) aspects of the maxillary incisors during occlusion, leading to friction and progressive enamel loss at these sites over time. This contrasts with the other options: anterior open bite reduces incisal contact, unilateral posterior crossbite primarily affects lateral segments, and Class I with posterior crowding does not typically produce this anterior-specific lingual wear.

Accommodation Options for Delegates Attending the 16th International Conference of ODOAN, Dharan, Nepal

Our Conference venue is White Elegance Palace, Dharan. 

Stay comfortably close to the venue! Here are our recommended hotels for your convenience:

1. Hotel Brick

• Address: Sainik Chowk, Dharan, Sunsari, Nepal
• Phone: +977 9769703533
• Distance: 1 Kilometer
• CLICK HERE TO VIEW REVIEWS ON GOOGLE

2. Hotel Meriken

• Address: Dharan-15, Ramlaxman Marga, Dharan, Sunsari, Nepal
• Phone: +977 9761003570
• Distance: 2.6 Kilometer
• CLICK HERE TO VIEW REVIEWS ON GOOGLE

3. Hotel Star Purwi

• Address: Chatara Line, Dharan, Sunsari, Nepal
• Phone: +977 9817302498 / +977 9840070025
• Distance: 750 meters
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Non AC Single @ Rs. 1600

AC Twin Double @ Rs. 2500

AC Deluxe Tripe Sharing @ Rs. 2500

AC Deluxe Master Bedrooms @ Rs. 2200

4. New Dreamland Hotel & Lodge

• Address: Dhankute Road, Dharan, Sunsari, Nepal
• Phone: +977 25 525024, +977 25 575024, +977 25 575300
• Distance: 1 Kilometer
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5. Hotel Gorkha

• Address: Chatara Line, Dharan, Sunsari, Nepal
• Phone: +977 25 582311 / +977 9801355198
• Distance: 450 meters
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6. Hotel Gajur Palace

• Address: Bhotepul, Dharan, Sunsari, Nepal
• Phone: +977 9805338898
• Distance: 2.3 Kilometer
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The Psychosocial Impact of Dental Aesthetics Questionnaire (PIDAQ) and the Index of Orthodontic Treatment Need (IOTN) are both used to assess treatment need. Which component of the IOTN is most directly correlated with the patient-reported concerns measured by the PIDAQ?

 The Psychosocial Impact of Dental Aesthetics Questionnaire (PIDAQ) and the Index of Orthodontic Treatment Need (IOTN) are both used to assess treatment need. Which component of the IOTN is most directly correlated with the patient-reported concerns measured by the PIDAQ?

A. The Treatment Complexity Index (TCI)

B. The Aesthetic Component (AC)

C. The Dental Health Component (DHC)

D. The Peer Assessment Rating (PAR) Index 

The correct answer is B. The Aesthetic Component (AC)

The PIDAQ assesses patient-reported psychosocial impacts (e.g., psychological, social, and aesthetic self-consciousness) stemming from perceived dental aesthetics, making it a subjective, condition-specific OHRQoL tool. The IOTN's Aesthetic Component (AC) directly evaluates subjective aesthetic impairment via a 10-point visual scale of anterior teeth appearance (clinician-rated but perception-based), aligning closely with PIDAQ's focus on self-perceived concerns. Validation studies consistently use AC for convergent validity of PIDAQ, showing significant correlations (e.g., Spearman's ρ = 0.389, p < 0.001 in Sahoo et al., 2025; p < 0.001 in multiple adaptations like Persian, Swedish, and Indian versions). PIDAQ scores discriminate across AC grades, with higher AC scores (worse aesthetics) linked to elevated psychosocial impacts.

In contrast, the Dental Health Component (DHC) measures objective malocclusion severity for health risks, showing correlations (e.g., r = 0.72, p < 0.01 in Brown & Moerenhout, 2016) but indirectly via aesthetic proxies in severe cases. TCI and PAR are unrelated (TCI from complexity indices; PAR for malocclusion quantification). Thus, AC provides the most direct link to PIDAQ's patient-centered aesthetic concerns.

Based on current, high-level evidence, which occlusal feature has demonstrated the strongest, albeit weak, statistical association with an increased prevalence of pain-related Temporomandibular Disorders (TMD)?

 # Based on current, high-level evidence, which occlusal feature has demonstrated the strongest, albeit weak, statistical association with an increased prevalence of pain-related Temporomandibular Disorders (TMD)?

A. Anterior Open Bite

B. Class II Division 2 Malocclusion

C. Overjet greater or equal to 6 mm

D. Posterior Unilateral Crossbite

The correct answer is D. Posterior Unilateral Crossbite

High-level evidence from systematic reviews, such as the 2025 review by Alghamdi et al. in Frontiers in Neurology (analyzing 17 studies on children/adolescents), identifies posterior unilateral crossbite as having the strongest association with pain-related TMD signs/symptoms, including TMJ/muscle pain and tenderness. Pooled data show odds ratios (ORs) of 2.25–5.74 (95% CIs: 1.15–4.43 to 1.18–27.85; p<0.05 across studies like Pereira et al. 2009 and Perrotta et al. 2018), indicating a 2–6-fold increased risk, though with low GRADE certainty due to cross-sectional designs and heterogeneity. This exceeds associations for other features: anterior open bite (OR ~1.5–2.0 in select studies, e.g., Sonnesen 1998); Class II Division 2 (OR 2.61 for general Class II, but weaker/subgroup-specific for Div 2, per Šimunović et al. 2024); and overjet ≥6 mm (OR ~1.8–2.5, less consistent in mixed/permanent dentition per Manfredini et al. 2010). A 2025 meta-analysis by Chen et al. in BMC Oral Health reports 59% TMD prevalence in unilateral crossbite cases (95% CI: 46%–72%), vs. 40%–44% for others. Overall, while all links are weak (ORs <6, multifactorial etiology), crossbite shows the most consistent statistical signal.